103 results on '"Szép T"'
Search Results
2. Condition, Reproduction and Survival of Barn Swallows from Chernobyl
- Author
-
Møller, A. P., Mousseau, T. A., Milinevsky, G., Peklo, A., Pysanets, E., and Szép, T.
- Published
- 2005
3. Exposure to Ectoparasites Increases within-Brood Variability in Size and Body Mass in the Sand Martin
- Author
-
Szép, T. and Møller, A. P.
- Published
- 2000
4. Cost of Parasitism and Host Immune Defence in the Sand Martin Riparia riparia: A Role for Parent-Offspring Conflict?
- Author
-
Szép, T. and Møller, A. P.
- Published
- 1999
5. Farmland practices are driving bird population decline across Europe
- Author
-
Rigal, S., Dakos, V., Alonso, H., Auniņš, A., Benkő, Z., Brotons, L., Chodkiewicz, T., Chylarecki, P., Carli, E. de, Moral, J.C. del, Domşa, C., Escandell, V., Fontaine, B., Foppen, R.P.B., Gregory, R., Harris, S., Herrando, S., Husby, M., Ieronymidou, C., Jiguet, F., Kennedy, J., Klvaňová, A., Kmecl, P., Kuczyński, L., Kurlavičius, P., Kålås, J.A., Lehikoinen, A., Lindström, Å., Lorrillière, R., Moshøj, C., Nellis, R., Noble, D., Eskildsen, D.P., Paquet, J.-Y., Pélissié, M., Pladevall, C., Portolou, D., Reif, J., Schmid, H., Seaman, B., Szabo, Z.D., Szép, T., Florenzano, G.T., Teufelbauer, N., Trautmann, S., Turnhout, C. van, Vermouzek, Z., Vikstrøm, T., Voříšek, P., Weiserbs, A., Devictor, V., Rigal, S., Dakos, V., Alonso, H., Auniņš, A., Benkő, Z., Brotons, L., Chodkiewicz, T., Chylarecki, P., Carli, E. de, Moral, J.C. del, Domşa, C., Escandell, V., Fontaine, B., Foppen, R.P.B., Gregory, R., Harris, S., Herrando, S., Husby, M., Ieronymidou, C., Jiguet, F., Kennedy, J., Klvaňová, A., Kmecl, P., Kuczyński, L., Kurlavičius, P., Kålås, J.A., Lehikoinen, A., Lindström, Å., Lorrillière, R., Moshøj, C., Nellis, R., Noble, D., Eskildsen, D.P., Paquet, J.-Y., Pélissié, M., Pladevall, C., Portolou, D., Reif, J., Schmid, H., Seaman, B., Szabo, Z.D., Szép, T., Florenzano, G.T., Teufelbauer, N., Trautmann, S., Turnhout, C. van, Vermouzek, Z., Vikstrøm, T., Voříšek, P., Weiserbs, A., and Devictor, V.
- Abstract
Item does not contain fulltext
- Published
- 2023
6. Moral rhetoric in discrete choice models: a Natural Language Processing approach
- Author
-
Szép, T. (author), van Cranenburgh, S. (author), Chorus, C.G. (author), Szép, T. (author), van Cranenburgh, S. (author), and Chorus, C.G. (author)
- Abstract
This paper proposes a new method to combine choice- and text data to infer moral motivations from people’s actions. To do this, we rely on moral rhetoric, in other words, extracting moral values from verbal expressions with Natural Language Processing techniques. We use moral rhetoric based on a well-established moral, psychological theory called Moral Foundations Theory. We use moral rhetoric as input in Discrete Choice Models to gain insights into moral behaviour based on people’s words and actions. We test our method in a case study of voting and party defection in the European Parliament. Our results indicate that moral rhetoric have significant explanatory power in modelling voting behaviour. We interpret the results in the light of political science literature and propose ways for future investigations., Transport and Logistics, Industrial Design Engineering, Engineering, Systems and Services
- Published
- 2023
- Full Text
- View/download PDF
7. Give and take: Moral aspects of travelers' intentions to participate in a hypothetical established social routing scheme
- Author
-
Szép, T. (author), van den Berg, T.G.C. (author), Cointe, Nicolas (author), Daniel, Aemiro Melkamu (author), Martinho, Andreia (author), Tang, Tanzhe (author), Chorus, C.G. (author), Szép, T. (author), van den Berg, T.G.C. (author), Cointe, Nicolas (author), Daniel, Aemiro Melkamu (author), Martinho, Andreia (author), Tang, Tanzhe (author), and Chorus, C.G. (author)
- Abstract
Social routing schemes are widely regarded as promising tools to reduce traffic congestion in urban networks. We contribute to the growing literature on such schemes and their effect on travel behavior, by exploring the interaction between the characteristics and framing of the scheme on the one hand, and travelers' moral personality and moral motivations on the other hand. Our method uses a two-wave stated intention experiment eliciting preferences in a hypothetical context where a social routing scheme is presumed to have been established already. This is followed by a morality survey. We hypothesize and then confirm the following: when a social routing scheme is framed and designed as an altruistic effort requesting personal sacrifices for the benefit of other travelers, people who strongly adhere to care related notions of morality are attracted to such a scheme. On the contrary, a scheme that is designed and framed as a collective endeavour which would also benefit participating travelers attracts those who strongly adhere to moral notions related to fairness. We derive tentative policy recommendations from our findings, suggesting that a collective good scheme, albeit more difficult to implement, is likely to be more viable in the long run., Transport and Logistics, Industrial Design Engineering
- Published
- 2023
- Full Text
- View/download PDF
8. Give and take: Moral aspects of travelers' intentions to participate in a hypothetical established social routing scheme
- Author
-
Szép, T., van den Berg, T.G.C., Cointe, Nicolas, Daniel, Aemiro Melkamu, Martinho, Andreia, Tang, Tanzhe, and Chorus, C.G.
- Subjects
Urban Studies ,Moral Foundations Questionnaire ,Sociology and Political Science ,Discrete choice analysis ,Tourism, Leisure and Hospitality Management ,Contextual morality ,Social routing ,Development ,Altruism ,Collective good ,Transport Systems and Logistics - Abstract
Social routing schemes are widely regarded as promising tools to reduce traffic congestion in urban networks. We contribute to the growing literature on such schemes and their effect on travel behavior, by exploring the interaction between the characteristics and framing of the scheme on the one hand, and travelers' moral personality and moral motivations on the other hand. Our method uses a two-wave stated intention experiment eliciting preferences in a hypothetical context where a social routing scheme is presumed to have been established already. This is followed by a morality survey. We hypothesize and then confirm the following: when a social routing scheme is framed and designed as an altruistic effort requesting personal sacrifices for the benefit of other travelers, people who strongly adhere to care related notions of morality are attracted to such a scheme. On the contrary, a scheme that is designed and framed as a collective endeavour which would also benefit participating travelers attracts those who strongly adhere to moral notions related to fairness. We derive tentative policy recommendations from our findings, suggesting that a collective good scheme, albeit more difficult to implement, is likely to be more viable in the long run.
- Published
- 2023
9. Identifying moral antecedents of decision-making in discrete choice models
- Author
-
Szép, T., Chorus, C.G., van Cranenburgh, S., and Delft University of Technology
- Subjects
Discrete Choice Modelling ,Identifiability ,Moral Decision Making ,Methodological and Empirical Research - Abstract
Discrete Choice Models are valuable tools for quantitative decision-making analysis: they allow analysts to draw behavioural conclusions from data, better understand and predict choices, and evaluate policies. However, up until recently, they had a blind spot for morality. Moral values often play an essential role in decision-making; fairness or loyalty can deter people from following self-interest. Moral motivations can also prompt decision-makers to change their minds when contemplating a dilemma or hide their preferences when they want to avoid judgement. These notions are not aligned with crucial behavioural assumptions traditional Discrete Choice Models are based on, such as stable preferences echoing through choices or decision-makers maximizing their utility. This thesis aims to develop and test new Discrete Choice Models that help identify morality in a mathematically rigorous framework, thus increasing the behavioural realism of Discrete Choice Models in moral decision-making. To do this, it uses two approaches.
- Published
- 2022
10. The future distribution of wetland birds breeding in Europe validated against observed changes in distribution
- Author
-
Soultan, A., Pavón-Jordán, D., Bradter, U., Sandercock, B.K., Hochachka, W.M., Johnston, A., Brommer, J., Gaget, E., Keller, V., Knaus, P., Aghababyan, K., Maxhuni, Q., Vintchevski, A., Nagy, K., Raudonikis, L., Balmer, D., Noble, D., Leitão, D., Øien, I.J., Shimmings, P., Sultanov, E., Caffrey, B., Boyla, K., Radišić, D., Lindström, Å., Velevski, M., Pladevall, C., Brotons, L., Karel, Š., Rajković, D.Z., Chodkiewicz, T., Wilk, T., Szép, T., Turnhout, C.A.M. van, Foppen, R.P.B., Burfield, I., Vikstrøm, T., Mazal, V.D., Eaton, M., Vorisek, P., Lehikoinen, A., Herrando, S., Kuzmenko, T., Bauer, H.-G., Kalyakin, M.V., Voltzit, O.V., Sjeničić, J., Pärt, T., Soultan, A., Pavón-Jordán, D., Bradter, U., Sandercock, B.K., Hochachka, W.M., Johnston, A., Brommer, J., Gaget, E., Keller, V., Knaus, P., Aghababyan, K., Maxhuni, Q., Vintchevski, A., Nagy, K., Raudonikis, L., Balmer, D., Noble, D., Leitão, D., Øien, I.J., Shimmings, P., Sultanov, E., Caffrey, B., Boyla, K., Radišić, D., Lindström, Å., Velevski, M., Pladevall, C., Brotons, L., Karel, Š., Rajković, D.Z., Chodkiewicz, T., Wilk, T., Szép, T., Turnhout, C.A.M. van, Foppen, R.P.B., Burfield, I., Vikstrøm, T., Mazal, V.D., Eaton, M., Vorisek, P., Lehikoinen, A., Herrando, S., Kuzmenko, T., Bauer, H.-G., Kalyakin, M.V., Voltzit, O.V., Sjeničić, J., and Pärt, T.
- Abstract
Contains fulltext : 252548.pdf (Publisher’s version ) (Open Access)
- Published
- 2022
11. Decision Field Theory: Equivalence with probit models and guidance for identifiability
- Author
-
Szép, T. (author), van Cranenburgh, S. (author), Chorus, C.G. (author), Szép, T. (author), van Cranenburgh, S. (author), and Chorus, C.G. (author)
- Abstract
We examine identifiability and distinguishability in Decision Field Theory (DFT) models and highlight pitfalls and how to avoid them. In the past literature, the models’ parameters have been put forward as being able to capture the psychological processes in a decision maker's mind during deliberation. DFT models have been widely used to analyse human decision making behaviour, and many empirical applications in the choice modelling domain rely solely on data concerning the observed final choice. This raises the question if such data are rich enough to allow for the identification of the model's parameters. Insight into identifiability and distinguishability is crucial as it allows the researcher to determine which behavioural and psychological conclusions can or cannot be drawn from the estimated DFT model and how a DFT model can be specified in such a way that resulting parameters have meaningful interpretations. In this paper, we address this issue. To do this, we first show which specifications of DFT are equivalent to conventional probit models. Then, building on this equivalence result, we apply established analytical methods to highlight and explain the identification and distinguishability issues that arise when estimating DFT models on conventional choice data. We find evidence that some of the DFT models’ special cases suffer from identifiability issues. Our results warrant caution when DFT models are used to infer psychological processes and human behaviour from conventional choice data, and they help researchers choose the correct specification of DFT models., Transport and Logistics
- Published
- 2022
- Full Text
- View/download PDF
12. Identifying moral antecedents of decision-making in discrete choice models
- Author
-
Szép, T. (author) and Szép, T. (author)
- Abstract
Discrete Choice Models are valuable tools for quantitative decision-making analysis: they allow analysts to draw behavioural conclusions from data, better understand and predict choices, and evaluate policies. However, up until recently, they had a blind spot for morality. Moral values often play an essential role in decision-making; fairness or loyalty can deter people from following self-interest. Moral motivations can also prompt decision-makers to change their minds when contemplating a dilemma or hide their preferences when they want to avoid judgement. These notions are not aligned with crucial behavioural assumptions traditional Discrete Choice Models are based on, such as stable preferences echoing through choices or decision-makers maximizing their utility. This thesis aims to develop and test new Discrete Choice Models that help identify morality in a mathematically rigorous framework, thus increasing the behavioural realism of Discrete Choice Models in moral decision-making. To do this, it uses two approaches., Transport and Logistics
- Published
- 2022
13. Modelling forest bird community richness using CORINE land cover data: a study at the landscape scale in Hungary
- Author
-
Mag, Zs., Szép, T., Nagy, K., and Standovár, T.
- Published
- 2011
14. Discrete event simulation in object oriented languages
- Author
-
Gyepesi, Gy., Szép, T., Jamrik, F., Janek, G., Knuth, E., and Mittermeir, Roland, editor
- Published
- 1992
- Full Text
- View/download PDF
15. Mixed Species Flocking of Tits (Parus spp.): A Field Experiment
- Author
-
Székely, T. and Szép, T.
- Published
- 1989
16. Wintering bird communities are tracking climate change faster than breeding communities
- Author
-
Lehikoinen, A., Lindström, A., Santangeli, A., Sirkiä, P.M., Brotons, L., Devictor, V., Elts, J., Foppen, R.P.B., Heldbjerg, H., Herrando, S., Herremans, M., Hudson, M.A.R., Jiguet, F., Johnston, A., Lorrilliere, R., Marjakangas, E.L., Michel, N.L., Moshoj, C.M., Nellis, R., Paquet, J.-Y., Smith, Adam C., Szép, T., Turnhout, C.A.M. van, Lehikoinen, A., Lindström, A., Santangeli, A., Sirkiä, P.M., Brotons, L., Devictor, V., Elts, J., Foppen, R.P.B., Heldbjerg, H., Herrando, S., Herremans, M., Hudson, M.A.R., Jiguet, F., Johnston, A., Lorrilliere, R., Marjakangas, E.L., Michel, N.L., Moshoj, C.M., Nellis, R., Paquet, J.-Y., Smith, Adam C., Szép, T., and Turnhout, C.A.M. van
- Abstract
Item does not contain fulltext
- Published
- 2021
17. Obfuscation maximization-based decision-making: Theory, methodology and first empirical evidence
- Author
-
Chorus, C.G. (author), van Cranenburgh, S. (author), Daniel, A.M. (author), Sandorf, Erlend Dancke (author), Sobhani, Anae (author), Szép, T. (author), Chorus, C.G. (author), van Cranenburgh, S. (author), Daniel, A.M. (author), Sandorf, Erlend Dancke (author), Sobhani, Anae (author), and Szép, T. (author)
- Abstract
Theories of decision-making are routinely based on the notion that decision-makers choose alternatives which align with their underlying preferences—and hence that their preferences can be inferred from their choices. In some situations, however, a decision-maker may wish to hide his or her preferences from an onlooker. This paper argues that such obfuscation-based choice behavior is likely to be relevant in various situations, such as political decision-making. This paper puts forward a simple and tractable discrete choice model of obfuscation-based choice behavior, by combining the well-known concepts of Bayesian inference and information entropy. After deriving the model and illustrating some key properties, the paper presents the results of an obfuscation game that was designed to explore whether decision-makers, when properly incentivized, would be able to obfuscate effectively, and which heuristics they employ to do so. Together, the analyses presented in this paper provide stepping stones towards a more profound understanding of obfuscation-based decision-making., Transport and Logistics
- Published
- 2021
- Full Text
- View/download PDF
18. The role of parasites in ecology and evolution of migration and migratory connectivity
- Author
-
Møller, A. P. and Szép, T.
- Published
- 2011
- Full Text
- View/download PDF
19. Metals and Selenium in Sand Martin's Plumage
- Author
-
Vallner, J., Posta, J., Prokisch, J., Braun, M., Szép, T., and Kiss, F.
- Published
- 2000
- Full Text
- View/download PDF
20. Rapid evolutionary change in a secondary sexual character linked to climatic change
- Author
-
MØLLER, A. P. and SZÉP, T.
- Published
- 2005
21. Contrasting population trends of Common Starlings (Sturnus vulgaris) across Europe
- Author
-
Heldbjerg, H., Fox, A.D., Lehikoinen, A., Sunde, P., Aunins, A., Balmer, D.E., Calvi, G., Chodkiewicz, T., Chylarecki, P., Escandell, V., Foppen, R.P.B., Gamero, A., Hristov, I., Husby, M., Jiguet, F., Kmecl, P., Kalas, J.A., Lewis, L.J., Lindstrom, A., Moshoj, C., Nellis, R., Paquet, J.-Y., Portolou, D., Ridzon, J., Skorpilová, J., Szabo, Z.D., Szép, T., Teufelbauer, N., Trautmann, S., Turnhout, C.A.M. van, Vermouzek, Z., Vorísek, P., Weiserbs, A., Heldbjerg, H., Fox, A.D., Lehikoinen, A., Sunde, P., Aunins, A., Balmer, D.E., Calvi, G., Chodkiewicz, T., Chylarecki, P., Escandell, V., Foppen, R.P.B., Gamero, A., Hristov, I., Husby, M., Jiguet, F., Kmecl, P., Kalas, J.A., Lewis, L.J., Lindstrom, A., Moshoj, C., Nellis, R., Paquet, J.-Y., Portolou, D., Ridzon, J., Skorpilová, J., Szabo, Z.D., Szép, T., Teufelbauer, N., Trautmann, S., Turnhout, C.A.M. van, Vermouzek, Z., Vorísek, P., and Weiserbs, A.
- Abstract
Contains fulltext : 210235.pdf (publisher's version ) (Closed access)
- Published
- 2019
22. Measuring the Social, Economic and Environmental Resilience – A Case Study of the Hungarian Cities
- Author
-
Nagy Zoltán and Szép Tekla
- Subjects
urban resilience ,spatial structure ,complex resilience index ,composite indicator ,cluster analysis ,r10 ,r11 ,r12 ,Regional economics. Space in economics ,HT388 ,Economics as a science ,HB71-74 - Abstract
The COVID-19 and 2021-2022 energy crises shed new light on urban resilience. Cities face many more challenges and external shocks. This study aims to measure urban resilience.
- Published
- 2023
- Full Text
- View/download PDF
23. Comparison of trace element and stable isotope approaches to the study of migratory connectivity: an example using two hirundine species breeding in Europe and wintering in Africa
- Author
-
Szép, T., Hobson, K. A., Vallner, J., Piper, S. E., Kovács, B., Szabó, D. Z., and Møller, A. P.
- Published
- 2009
- Full Text
- View/download PDF
24. Support for a Colleague
- Author
-
Alatalo, R. V., Aragón, S., Avilés, J. M., Barbosa, A., Gomes, C. Bessa, Cadée, N., Christe, P., Cuervo, J. J., Díaz, M., Erritzøe, J., Galeotti, P., Garamszegi, L. Z., Gil, D., Gontard-Danek, M., Legendre, S., Martin, T. E., Martínez, J., Martín-Vivaldi, M., Martínez, J. G., Merino, S., Moreno, J., Mousseau, Tim, Ninni, P., Petrie, M., Pulido, F., Rubolini, D., Saino, N., Soler, J. J., Soler, M., Spottiswoode, C., Szép, T., Thornhill, R., Zamora, C., and Sacchi, Roberto
- Published
- 2004
25. Tracking progress toward EU biodiversity strategy targets: EU policy effects in preserving its common farmland birds
- Author
-
Gamero, A., Brotons, L., Brunner, A., Foppen, R.P.B., Fornasari, L., Gregory, R.D., Herrando, S., Hořák, D., Jiguet, F., Kmecl, P., Lehikoinen, A., Lindström, Å., Paquet, J.-Y., Reif, J., Sirkiä, P.M., Škorpilová, J., van Strien, A., Szép, T., Telenský, T., Teufelbauer, N., Trautmann, S., van Turnhout, C.A.M., Vermouzek, Z., Vikstrøm, T., Voříšek, P., Gamero, A., Brotons, L., Brunner, A., Foppen, R.P.B., Fornasari, L., Gregory, R.D., Herrando, S., Hořák, D., Jiguet, F., Kmecl, P., Lehikoinen, A., Lindström, Å., Paquet, J.-Y., Reif, J., Sirkiä, P.M., Škorpilová, J., van Strien, A., Szép, T., Telenský, T., Teufelbauer, N., Trautmann, S., van Turnhout, C.A.M., Vermouzek, Z., Vikstrøm, T., and Voříšek, P.
- Abstract
Contains fulltext : 169035.pdf (publisher's version ) (Open Access)
- Published
- 2017
26. Consistent response of bird populations to climate change on two continents
- Author
-
Stephens, P.A., Mason, L.R., Green, R.E., Gregory, R.D., Sauer, J.R., Alison, J., Aunins, A., Brotons, L., Butchart, S.H.M., Campedelli, T., Chodkiewicz, T., Chylarecki, P., Crowe, O., Elts, J., Escandell, V., Foppen, R.P.B., Heldbjerg, H., Herrando, S., Husby, M., Jiguet, F., Lehikoinen, A., Lindström, Å., Noble, D.G., Paquet, J.-Y., Reif, J., Sattler, T., Szép, T., Teufelbauer, N., Trautmann, S., van Strien, A.J., Turnhout, C.A.M. van, Vorisek, P., Willis, S.G., Stephens, P.A., Mason, L.R., Green, R.E., Gregory, R.D., Sauer, J.R., Alison, J., Aunins, A., Brotons, L., Butchart, S.H.M., Campedelli, T., Chodkiewicz, T., Chylarecki, P., Crowe, O., Elts, J., Escandell, V., Foppen, R.P.B., Heldbjerg, H., Herrando, S., Husby, M., Jiguet, F., Lehikoinen, A., Lindström, Å., Noble, D.G., Paquet, J.-Y., Reif, J., Sattler, T., Szép, T., Teufelbauer, N., Trautmann, S., van Strien, A.J., Turnhout, C.A.M. van, Vorisek, P., and Willis, S.G.
- Abstract
Item does not contain fulltext
- Published
- 2016
27. Assessing the Effects of Climate on Host-Parasite Interactions: A Comparative Study of European Birds and their Parasites
- Author
-
MØLLER, A. P., MERINO, S., SOLER, J. J., ANTONOV, A., BADÁS, E. P., CALERO-TORRALBO, M. A., DE LOPE, F., EEVA, T., FIGUEROLA, J., FLENSTED-JENSEN, E., GARAMSZEGI, L. Z., GONZÁLEZ-BRAOJOS, S., GWINNER, H., HANSSEN, S. A., HEYLEN, D., ILMONEN, P., KLARBORG, K., KORPIMÄKI, E., MARTÍNEZ, J., MARTÍNEZ-DE LA PUENTE, J., MARZAL, A., MATTHYSEN, E., MATYJASIAK, P., MOLINA-MORALES, M., MORENO, J., MOUSSEAU, T. A., NIELSEN, J. T., PAP, P. L., RIVERO DE AGUILAR, J., SHURULINKOV, P., SLAGSVOLD, T., SZÉP, T., SZÖLLŐSI, E., TÖRÖK, J., VACLAV, R., VALERA, F., ZIANE, N.
- Subjects
education - Published
- 2013
28. Mezőgazdasági területek felszínborításának és tájszerkezetének hatása három madárfaj gyakoriságára = The effects of farmland composition and heterogeneity on the density of three farmland bird species in Hungary
- Author
-
Erdős, S, Szép, T, Báldi, A, and Nagy, K
- Published
- 2007
29. Ecological conditions during winter affect sexual selection and breeding in a migratory bird.
- Author
-
Saino, N, Szép, T, Ambrosini, R, Romano, M, Møller, A, Møller, AP, AMBROSINI, ROBERTO, Saino, N, Szép, T, Ambrosini, R, Romano, M, Møller, A, Møller, AP, and AMBROSINI, ROBERTO
- Abstract
Populations of migratory birds have undergone marked declines, although the causes and mechanisms remain unknown. Because environmental effects on population dynamics are mediated by the effects of ecological factors on individuals, understanding changes in individual phenotypes in response to ecological conditions is key to understanding population trends. We show that breeding individuals of a declining population of trans-Saharan migratory barn swallows, Hirundo rustica, were affected by environmental conditions, as estimated from the normalized difference vegetation index (NDVI), reflecting primary production, in their winter quarters. The breeding dates of the same individuals in consecutive breeding seasons were advanced and clutch sizes were larger after winters with high NDVI in the winter quarters. Feather moult was also affected by winter conditions, with consequences for male sexual attractiveness. Length of tail ornament was positively correlated with NDVI during the previous winter, and males with large tail ornaments reproduced earlier and had larger clutches. The mean annual breeding date of the population was earlier and breeding success was increased after favourable winters, but this result was mainly determined by a single winter with very low NDVI. Thus, ecological conditions in Africa influence individual performance and productivity in a barn swallow population.
- Published
- 2004
30. Migration, moult and climate change in barn swallows Hirundo rustica in South Africa
- Author
-
Møller, AP, primary, Nuttall, R, additional, Piper, SE, additional, Szép, T, additional, and Vickers, EJ, additional
- Published
- 2011
- Full Text
- View/download PDF
31. Aerial Hunting Techniques and Predation Success of HobbiesFalco subbuteoon Sand MartinRiparia ripariaat Breeding Colonies
- Author
-
Probst, R., primary, Nemeschkal, H.L., additional, McGrady, M., additional, Tucakov, M., additional, and Szép, T., additional
- Published
- 2011
- Full Text
- View/download PDF
32. The role of parasites in ecology and evolution of migration and migratory connectivity
- Author
-
Møller, A. P., primary and Szép, T., additional
- Published
- 2010
- Full Text
- View/download PDF
33. Rapid evolutionary change in a secondary sexual character linked to climatic change
- Author
-
Møller, A. P., primary and Szép, T., additional
- Published
- 2004
- Full Text
- View/download PDF
34. Sample preparation and determination of the element content from low‐weight feather samples
- Author
-
Vallner, Judit, primary, Posta, J., additional, Szép, T., additional, Braun, M., additional, Balogh, A., additional, and Kiss, F., additional
- Published
- 1999
- Full Text
- View/download PDF
35. Aerial hunting techniques and predation success of Hobbies Falco subbuteo on Sand Martin Riparia riparia at breeding colonies.
- Author
-
Probst, R., Nemeschkal, H. L., McGrady, M., Tucakov, M., and Szép, T.
- Abstract
The article explores Hobbies Falco subbuteo's techniques when hunting Sand Martin Riparia riparia colonies. In 2004 and 2005, 291 attacks in Austria, Hungary and Serbia were analyzed by the authors. They disclosed that Hobby attacks were mostly done in daylight and it is mostly done by males who are more prone to hunt by themselves. The authors concluded that escape success of swallows differ in pre- and post-fledging period and added that the hunting success of Hobbie depended mostly on whether an attack was carried out during pre- or post-fledging.
- Published
- 2011
- Full Text
- View/download PDF
36. Accelerating backtrack search with a best-first-search strategy
- Author
-
Mann Zoltán Ádám and Szép Tamás
- Subjects
best-first search ,backtrack ,branch-and-bound ,constraint satisfaction problem ,frequent restarting ,Mathematics ,QA1-939 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
Backtrack-style exhaustive search algorithms for NP-hard problems tend to have large variance in their runtime. This is because “fortunate” branching decisions can lead to finding a solution quickly, whereas “unfortunate” decisions in another run can lead the algorithm to a region of the search space with no solutions. In the literature, frequent restarting has been suggested as a means to overcome this problem. In this paper, we propose a more sophisticated approach: a best-firstsearch heuristic to quickly move between parts of the search space, always concentrating on the most promising region. We describe how this idea can be efficiently incorporated into a backtrack search algorithm, without sacrificing optimality. Moreover, we demonstrate empirically that, for hard solvable problem instances, the new approach provides significantly higher speed-up than frequent restarting.
- Published
- 2014
- Full Text
- View/download PDF
37. Support for a Colleague [3]
- Author
-
Alatalo, R. V., Aragón, S., Avilés, J. M., Barbosa, A., Gomes, C. B., Cadée, N., Christe, P., Cuervo, J. J., Díaz, M., Erritzøe, J., Galeotti, P., Garamszegi, L. Z., Diego Gil, Gontard-Danek, M., Legendre, S., Martin, T. E., Martínez, J., Martín-Vivaldi, M., Martínez, J. G., Merino, S., Moreno, J., Mousseau, T., Ninni, P., Petrie, M., Pulido, F., Rubolini, D., Saino, N., Soler, J. J., Soler, M., Spottiswoode, C., Szép, T., Thornhill, R., Zamora, C., and Sacchi, R.
38. Population responses of bird populations to climate change on two continents vary with species’ ecological traits but not with direction of change in climate suitability
- Author
-
Mason, LR, Green, RE, Howard, C, Stephens, PA, Willis, SG, Aunins, A, Brotons, L, Chodkiewicz, T, Chylarecki, P, Escandell, V, Foppen, RPB, Herrando, S, Husby, M, Jiguet, F, Kålås, JA, Lindström, Å, Massimino, D, Moshøj, C, Nellis, R, Paquet, JY, Reif, J, Sirkiä, PM, Szép, T, Florenzano, GT, Teufelbauer, N, Trautmann, S, Van Strien, A, Van Turnhout, CAM, Voříšek, P, and Gregory, RD
- Subjects
climate suitability trend ,13. Climate action ,breeding habitat ,sense organs ,migratory behaviour ,population trend ,15. Life on land ,skin and connective tissue diseases ,species distribution models ,body mass - Abstract
Climate change is a major global threat to biodiversity with widespread impacts on ecological communities. Evidence for beneficial impacts on populations is perceived to be stronger and more plentiful than that for negative impacts, but few studies have investigated this apparent disparity, or how ecological factors affect population responses to climatic change. We examined the strength of the relationship between species-specific regional population changes and climate suitability trends (CST), using 30-year datasets of population change for 525 breeding bird species in Europe and the USA. These data indicate a consistent positive relationship between population trend and CST across the two continents. Importantly, we found no evidence that this positive relationship differs between species expected to be negatively and positively impacted across the entire taxonomic group, suggesting that climate change is causing equally strong, quantifiable population increases and declines. Species’ responses to changing climatic suitability varied with ecological traits, however, particularly breeding habitat preference and body mass. Species associated with inland wetlands responded most strongly and consistently to recent climatic change. In Europe, smaller species also appeared to respond more strongly, whilst the relationship with body mass was less clear-cut for North American birds. Overall, our results identify the role of certain traits in modulating responses to climate change and emphasise the importance of long-term data on abundance for detecting large-scale species’ responses to environmental changes.
39. Ecological conditions during winter affect sexual selection and breeding in a migratory bird
- Author
-
Tibor Szép, Anders Pape Møller, Nicola Saino, Maria Romano, Roberto Ambrosini, Saino, N, Szép, T, Ambrosini, R, Romano, M, and Møller, A
- Subjects
media_common.quotation_subject ,Population ,Population Dynamics ,normalized difference vegetation index ,Biology ,migration ,phenotypic plasticity ,General Biochemistry, Genetics and Molecular Biology ,Songbirds ,Sexual Behavior, Animal ,Hirundo ,Animals ,Ecosystem ,Selection, Genetic ,education ,Africa South of the Sahara ,General Environmental Science ,media_common ,education.field_of_study ,Phenotypic plasticity ,Sex Characteristics ,General Immunology and Microbiology ,Ecology ,Sexual attraction ,Reproduction ,General Medicine ,biology.organism_classification ,Productivity (ecology) ,Sexual selection ,connectivity ,Animal Migration ,BIO/07 - ECOLOGIA ,Seasons ,General Agricultural and Biological Sciences ,carry-over effect ,Research Article ,BIO/05 - ZOOLOGIA - Abstract
Populations of migratory birds have undergone marked declines, although the causes and mechanisms remain unknown. Because environmental effects on population dynamics are mediated by the effects of ecological factors on individuals, understanding changes in individual phenotypes in response to ecological conditions is key to understanding population trends. We show that breeding individuals of a declining population of trans-Saharan migratory barn swallows, Hirundo rustica, were affected by environmental conditions, as estimated from the normalized difference vegetation index (NDVI), reflecting primary production, in their winter quarters. The breeding dates of the same individuals in consecutive breeding seasons were advanced and clutch sizes were larger after winters with high NDVI in the winter quarters. Feather moult was also affected by winter conditions, with consequences for male sexual attractiveness. Length of tail ornament was positively correlated with NDVI during the previous winter, and males with large tail ornaments reproduced earlier and had larger clutches. The mean annual breeding date of the population was earlier and breeding success was increased after favourable winters, but this result was mainly determined by a single winter with very low NDVI. Thus, ecological conditions in Africa influence individual performance and productivity in a barn swallow population.
- Published
- 2004
40. Accelerated farmland bird population declines in European countries after their recent EU accession.
- Author
-
Reif J, Gamero A, Hološková A, Aunins A, Chodkiewicz T, Hristov I, Kurlavičius P, Leivits M, Szép T, and Voříšek P
- Subjects
- Animals, Europe, Farms, Agriculture, Birds, Biodiversity, Conservation of Natural Resources, European Union, Population Dynamics
- Abstract
Agricultural intensification is a major driver of global biodiversity loss. In Europe, intensification progressed over the 20th century and was accelerated by instruments of the EU's Common Agricultural Policy. Central and Eastern European (CEE) countries standing outside the EU until the beginning of the 21st century employed less intensive farming and are considered one of the continent's farmland biodiversity strongholds. Their recent EU accession might be either viewed as a threat to farmland biodiversity due to the availability of funds to increase agricultural production or as an opportunity to implement conservation measures aimed to preserve biodiversity. Here we assessed these possibilities using long-term monitoring data on farmland bird populations in seven CEE countries. We tested whether mean relative abundance and population trends changed after countries' EU accession, and whether such changes also occurred in agricultural management and conservation measures. Both agricultural intensity and spending for agri-environmental and climatic schemes increased when the CEE countries joined the EU. At the same time, farmland bird populations started to decline and their relative abundance was lower after than before EU accession. In addition, increases in fertilizer application were negatively associated with annual changes in relative farmland bird population sizes, indicating a negative impact of intensive agriculture. Taken together, these results indicate that despite the great power of the EU's environmental legislation to improve the population status of species at risk, this does not apply to farmland birds. In their case, the adverse impacts of agricultural intensification most likely overrode the possible benefits of conservation measures. To secure this region as one of the continent's farmland biodiversity strongholds, policy and management actions are urgently needed., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Jiri Reif reports financial support was provided by Czech Science Foundation. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
41. Local colonisations and extinctions of European birds are poorly explained by changes in climate suitability.
- Author
-
Howard C, Marjakangas EL, Morán-Ordóñez A, Milanesi P, Abuladze A, Aghababyan K, Ajder V, Arkumarev V, Balmer DE, Bauer HG, Beale CM, Bino T, Boyla KA, Burfield IJ, Burke B, Caffrey B, Chodkiewicz T, Del Moral JC, Mazal VD, Fernández N, Fornasari L, Gerlach B, Godinho C, Herrando S, Ieronymidou C, Johnston A, Jovicevic M, Kalyakin M, Keller V, Knaus P, Kotrošan D, Kuzmenko T, Leitão D, Lindström Å, Maxhuni Q, Mihelič T, Mikuska T, Molina B, Nagy K, Noble D, Øien IJ, Paquet JY, Pladevall C, Portolou D, Radišić D, Rajkov S, Rajković DZ, Raudonikis L, Sattler T, Saveljić D, Shimmings P, Sjenicic J, Šťastný K, Stoychev S, Strus I, Sudfeldt C, Sultanov E, Szép T, Teufelbauer N, Uzunova D, van Turnhout CAM, Velevski M, Vikstrøm T, Vintchevski A, Voltzit O, Voříšek P, Wilk T, Zurell D, Brotons L, Lehikoinen A, and Willis SG
- Subjects
- Animals, Ecosystem, Birds, Climate Change
- Abstract
Climate change has been associated with both latitudinal and elevational shifts in species' ranges. The extent, however, to which climate change has driven recent range shifts alongside other putative drivers remains uncertain. Here, we use the changing distributions of 378 European breeding bird species over 30 years to explore the putative drivers of recent range dynamics, considering the effects of climate, land cover, other environmental variables, and species' traits on the probability of local colonisation and extinction. On average, species shifted their ranges by 2.4 km/year. These shifts, however, were significantly different from expectations due to changing climate and land cover. We found that local colonisation and extinction events were influenced primarily by initial climate conditions and by species' range traits. By contrast, changes in climate suitability over the period were less important. This highlights the limitations of using only climate and land cover when projecting future changes in species' ranges and emphasises the need for integrative, multi-predictor approaches for more robust forecasting., (© 2023. The Author(s).)
- Published
- 2023
- Full Text
- View/download PDF
42. Ecological barriers mediate spatiotemporal shifts of bird communities at a continental scale.
- Author
-
Marjakangas EL, Bosco L, Versluijs M, Xu Y, Santangeli A, Holopainen S, Mäkeläinen S, Herrando S, Keller V, Voříšek P, Brotons L, Johnston A, Princé K, Willis SG, Aghababyan K, Ajder V, Balmer DE, Bino T, Boyla KA, Chodkiewicz T, Del Moral JC, Mazal VD, Ferrarini A, Godinho C, Gustin M, Kalyakin M, Knaus P, Kuzmenko T, Lindström Å, Maxhuni Q, Molina B, Nagy K, Radišić D, Rajkov S, Rajković DZ, Raudoniki L, Sjeničić J, Stoychev S, Szép T, Teufelbauer N, Ursul S, van Turnhout CAM, Velevski M, Vikstrøm T, Wilk T, Voltzit O, Øien IJ, Sudfeldt C, Gerlach B, and Lehikoinen A
- Subjects
- Animals, Biodiversity, Climate Change, Forecasting, Birds physiology, Ecosystem
- Abstract
Species' range shifts and local extinctions caused by climate change lead to community composition changes. At large spatial scales, ecological barriers, such as biome boundaries, coastlines, and elevation, can influence a community's ability to shift in response to climate change. Yet, ecological barriers are rarely considered in climate change studies, potentially hindering predictions of biodiversity shifts. We used data from two consecutive European breeding bird atlases to calculate the geographic distance and direction between communities in the 1980s and their compositional best match in the 2010s and modeled their response to barriers. The ecological barriers affected both the distance and direction of bird community composition shifts, with coastlines and elevation having the strongest influence. Our results underscore the relevance of combining ecological barriers and community shift projections for identifying the forces hindering community adjustments under global change. Notably, due to (macro)ecological barriers, communities are not able to track their climatic niches, which may lead to drastic changes, and potential losses, in community compositions in the future.
- Published
- 2023
- Full Text
- View/download PDF
43. Farmland practices are driving bird population decline across Europe.
- Author
-
Rigal S, Dakos V, Alonso H, Auniņš A, Benkő Z, Brotons L, Chodkiewicz T, Chylarecki P, de Carli E, Del Moral JC, Domşa C, Escandell V, Fontaine B, Foppen R, Gregory R, Harris S, Herrando S, Husby M, Ieronymidou C, Jiguet F, Kennedy J, Klvaňová A, Kmecl P, Kuczyński L, Kurlavičius P, Kålås JA, Lehikoinen A, Lindström Å, Lorrillière R, Moshøj C, Nellis R, Noble D, Eskildsen DP, Paquet JY, Pélissié M, Pladevall C, Portolou D, Reif J, Schmid H, Seaman B, Szabo ZD, Szép T, Florenzano GT, Teufelbauer N, Trautmann S, van Turnhout C, Vermouzek Z, Vikstrøm T, Voříšek P, Weiserbs A, and Devictor V
- Subjects
- Animals, Farms, Europe, Population Dynamics, Birds physiology, Biodiversity, Ecosystem, Conservation of Natural Resources, Forests, Agriculture
- Abstract
Declines in European bird populations are reported for decades but the direct effect of major anthropogenic pressures on such declines remains unquantified. Causal relationships between pressures and bird population responses are difficult to identify as pressures interact at different spatial scales and responses vary among species. Here, we uncover direct relationships between population time-series of 170 common bird species, monitored at more than 20,000 sites in 28 European countries, over 37 y, and four widespread anthropogenic pressures: agricultural intensification, change in forest cover, urbanisation and temperature change over the last decades. We quantify the influence of each pressure on population time-series and its importance relative to other pressures, and we identify traits of most affected species. We find that agricultural intensification, in particular pesticides and fertiliser use, is the main pressure for most bird population declines, especially for invertebrate feeders. Responses to changes in forest cover, urbanisation and temperature are more species-specific. Specifically, forest cover is associated with a positive effect and growing urbanisation with a negative effect on population dynamics, while temperature change has an effect on the dynamics of a large number of bird populations, the magnitude and direction of which depend on species' thermal preferences. Our results not only confirm the pervasive and strong effects of anthropogenic pressures on common breeding birds, but quantify the relative strength of these effects stressing the urgent need for transformative changes in the way of inhabiting the world in European countries, if bird populations shall have a chance of recovering.
- Published
- 2023
- Full Text
- View/download PDF
44. Moral rhetoric in discrete choice models: a Natural Language Processing approach.
- Author
-
Szép T, van Cranenburgh S, and Chorus C
- Abstract
This paper proposes a new method to combine choice- and text data to infer moral motivations from people's actions. To do this, we rely on moral rhetoric, in other words, extracting moral values from verbal expressions with Natural Language Processing techniques. We use moral rhetoric based on a well-established moral, psychological theory called Moral Foundations Theory. We use moral rhetoric as input in Discrete Choice Models to gain insights into moral behaviour based on people's words and actions. We test our method in a case study of voting and party defection in the European Parliament. Our results indicate that moral rhetoric have significant explanatory power in modelling voting behaviour. We interpret the results in the light of political science literature and propose ways for future investigations., Competing Interests: Conflict of interestThe authors have no relevant financial or non-financial interests to disclose., (© The Author(s) 2023.)
- Published
- 2023
- Full Text
- View/download PDF
45. Wintering bird communities are tracking climate change faster than breeding communities.
- Author
-
Lehikoinen A, Lindström Å, Santangeli A, Sirkiä PM, Brotons L, Devictor V, Elts J, Foppen RPB, Heldbjerg H, Herrando S, Herremans M, Hudson MR, Jiguet F, Johnston A, Lorrilliere R, Marjakangas EL, Michel NL, Moshøj CM, Nellis R, Paquet JY, Smith AC, Szép T, and van Turnhout C
- Subjects
- Animals, Europe, North America, Population Dynamics, Seasons, Birds, Climate Change
- Abstract
Global climate change is driving species' distributions towards the poles and mountain tops during both non-breeding and breeding seasons, leading to changes in the composition of natural communities. However, the degree of season differences in climate-driven community shifts has not been thoroughly investigated at large spatial scales. We compared the rates of change in the community composition during both winter (non-breeding season) and summer (breeding) and their relation to temperature changes. Based on continental-scale data from Europe and North America, we examined changes in bird community composition using the community temperature index (CTI) approach and compared the changes with observed regional temperature changes during 1980-2016. CTI increased faster in winter than in summer. This seasonal discrepancy is probably because individuals are less site-faithful in winter, and can more readily shift their wintering sites in response to weather in comparison to the breeding season. Regional long-term changes in community composition were positively associated with regional temperature changes during both seasons, but the pattern was only significant during summer due to high annual variability in winter communities. Annual changes in community composition were positively associated with the annual temperature changes during both seasons. Our results were broadly consistent across continents, suggesting some climate-driven restructuring in both European and North American avian communities. Because community composition has changed much faster during the winter than during the breeding season, it is important to increase our knowledge about climate-driven impacts during the less-studied non-breeding season., (© 2021 British Ecological Society.)
- Published
- 2021
- Full Text
- View/download PDF
46. Spatially different annual cycles but similar haemosporidian infections in distant populations of collared sand martins.
- Author
-
Hahn S, Briedis M, Barboutis C, Schmid R, Schulze M, Seifert N, Szép T, and Emmenegger T
- Abstract
Background: Populations of long-distance migratory birds experience different environments and are consequently exposed to different parasites throughout their annual cycles. Though, specific whereabouts and accompanied host-parasite interactions remain unknown for most migratory passerines. Collared sand martins (Riparia riparia) breeding in the western Palaearctic spend the nonbreeding period in Africa, but it is not yet clear whether specific populations differ in overwintering locations and whether these also result in varying infections with vector-transmitted endoparasites., Results: Geolocator tracking revealed that collared sand martins from northern-central and central-eastern Europe migrate to distant nonbreeding sites in West Africa and the Lake Chad basin in central Africa, respectively. While the ranges of these populations were clearly separated throughout the year, they consistently spent up to 60% of the annual cycle in Africa. Ambient light recorded by geolocators further indicated unsheltered roosting during the nonbreeding season in Africa compared to the breeding season in Europe. We found 5-26% prevalence of haemosporidian parasites in three breeding populations and one migratory passage population that was only sampled but not tracked. In total, we identified seven Plasmodium and nine Haemoproteus lineages (incl. two and seven new lineages, respectively), the latter presumably typical for swallows (Hirundinae) hosts. 99.5% of infections had a low intensity, typical for chronic infection stages, whereas three individuals (0.5%) showed high parasitaemia typical for acute infections during spring migration and breeding., Conclusions: Our study shows that blood parasite infections are common in several western Palaearctic breeding populations of collared sand martins who spent the nonbreeding season in West Africa and the lake Chad region. Due to long residency at the nonbreeding grounds blood parasite transmissions may mainly occur at host population-specific residences sites in Europe and Africa; the latter being likely facilitated by unsheltered roosting and thus high vulnerability to hematophagous insects. The rare cases of high parasitaemia during spring migration and breeding further indicates either relapses of chronic infection or primary infections which occurred shortly before migration and during breeding., (© 2021. The Author(s).)
- Published
- 2021
- Full Text
- View/download PDF
47. Long-term and large-scale multispecies dataset tracking population changes of common European breeding birds.
- Author
-
Brlík V, Šilarová E, Škorpilová J, Alonso H, Anton M, Aunins A, Benkö Z, Biver G, Busch M, Chodkiewicz T, Chylarecki P, Coombes D, de Carli E, Del Moral JC, Derouaux A, Escandell V, Eskildsen DP, Fontaine B, Foppen RPB, Gamero A, Gregory RD, Harris S, Herrando S, Hristov I, Husby M, Ieronymidou C, Jiquet F, Kålås JA, Kamp J, Kmecl P, Kurlavičius P, Lehikoinen A, Lewis L, Lindström Å, Manolopoulos A, Martí D, Massimino D, Moshøj C, Nellis R, Noble D, Paquet A, Paquet JY, Portolou D, Ramírez I, Redel C, Reif J, Ridzoň J, Schmid H, Seaman B, Silva L, Soldaat L, Spasov S, Staneva A, Szép T, Florenzano GT, Teufelbauer N, Trautmann S, van der Meij T, van Strien A, van Turnhout C, Vermeersch G, Vermouzek Z, Vikstrøm T, Voříšek P, Weiserbs A, and Klvaňová A
- Subjects
- Animals, Conservation of Natural Resources, Databases, Factual, Europe, Population Dynamics, Birds
- Abstract
Around fifteen thousand fieldworkers annually count breeding birds using standardized protocols in 28 European countries. The observations are collected by using country-specific and standardized protocols, validated, summarized and finally used for the production of continent-wide annual and long-term indices of population size changes of 170 species. Here, we present the database and provide a detailed summary of the methodology used for fieldwork and calculation of the relative population size change estimates. We also provide a brief overview of how the data are used in research, conservation and policy. We believe this unique database, based on decades of bird monitoring alongside the comprehensive summary of its methodology, will facilitate and encourage further use of the Pan-European Common Bird Monitoring Scheme results.
- Published
- 2021
- Full Text
- View/download PDF
48. Covariation in population trends and demography reveals targets for conservation action.
- Author
-
Morrison CA, Butler SJ, Robinson RA, Clark JA, Arizaga J, Aunins A, Baltà O, Cepák J, Chodkiewicz T, Escandell V, Foppen RPB, Gregory RD, Husby M, Jiguet F, Kålås JA, Lehikoinen A, Lindström Å, Moshøj CM, Nagy K, Nebot AL, Piha M, Reif J, Sattler T, Škorpilová J, Szép T, Teufelbauer N, Thorup K, van Turnhout C, Wenninger T, and Gill JA
- Subjects
- Animals, Conservation of Natural Resources, Europe, Population Dynamics, Animal Migration, Birds
- Abstract
Wildlife conservation policies directed at common and widespread, but declining, species are difficult to design and implement effectively, as multiple environmental changes are likely to contribute to population declines. Conservation actions ultimately aim to influence demographic rates, but targeting actions towards feasible improvements in these is challenging in widespread species with ranges that encompass a wide range of environmental conditions. Across Europe, sharp declines in the abundance of migratory landbirds have driven international calls for action, but actions that could feasibly contribute to population recovery have yet to be identified. Targeted actions to improve conditions on poor-quality sites could be an effective approach, but only if local conditions consistently influence local demography and hence population trends. Using long-term measures of abundance and demography of breeding birds at survey sites across Europe, we show that co-occurring species with differing migration behaviours have similar directions of local population trends and magnitudes of productivity, but not survival rates. Targeted actions to boost local productivity within Europe, alongside large-scale (non-targeted) environmental protection across non-breeding ranges, could therefore help address the urgent need to halt migrant landbird declines. Such demographic routes to recovery are likely to be increasingly needed to address global wildlife declines.
- Published
- 2021
- Full Text
- View/download PDF
49. Older birds have better feathers: A longitudinal study on the long-distance migratory Sand Martin, Riparia riparia.
- Author
-
Szép T, Dobránszky J, Møller AP, Dyke G, and Lendvai ÁZ
- Subjects
- Age Factors, Animal Migration physiology, Animals, Birds, Cross-Sectional Studies, Feathers metabolism, Hungary, Longitudinal Studies, Molting, Passeriformes growth & development, Passeriformes physiology, Reproduction, Feathers growth & development, Feathers physiology
- Abstract
Feather quality is of critical importance to long-distance migratory birds. Here, we report a series of analyses of a unique data set encompassing known-age individuals of the long-distance migratory Sand Martin (Riparia riparia). Sampling over 17 years along the Tisza River, eastern Hungary, has resulted in the recapture of numerous individuals enabling longitudinal and cross-sectional investigation of the role of adaptation to variable environmental conditions on feather morphology. We show that older individuals tend to possess better quality feathers, measured using bending stiffness, feather length and thickness as proxies. Bending stiffness and feather thickness do not change with individual age, in contrast with increases in feather length and declines in daily feather growth versus age of individual alongside moult duration. Individuals who live to older ages tend to have similar, or higher, feather growth rates and better feather quality than individuals captured at younger ages. Thus, on the basis of strong selection against individuals with slow feather growth, as seen in other species of swallows and martins, which causes a delay in moult completion, the results of this analysis highlight the potential cost of producing better quality feathers when this depends on moult duration. Feather length also does change during the lifetime of the individual and thus enabled us to further investigate influence of individual and environmental conditions during the moult. The results of this analysis provide important insights on the adaptive significance of these traits, and the potential use of physical characteristics in unravelling the reasons why long distance migratory bird populations are in global decline., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
- Full Text
- View/download PDF
50. Consistent response of bird populations to climate change on two continents.
- Author
-
Stephens PA, Mason LR, Green RE, Gregory RD, Sauer JR, Alison J, Aunins A, Brotons L, Butchart SH, Campedelli T, Chodkiewicz T, Chylarecki P, Crowe O, Elts J, Escandell V, Foppen RP, Heldbjerg H, Herrando S, Husby M, Jiguet F, Lehikoinen A, Lindström Å, Noble DG, Paquet JY, Reif J, Sattler T, Szép T, Teufelbauer N, Trautmann S, van Strien AJ, van Turnhout CA, Vorisek P, and Willis SG
- Subjects
- Animal Migration, Animals, Biodiversity, Breeding, Ecological Parameter Monitoring, Europe, Population Dynamics, United States, Birds, Climate Change
- Abstract
Global climate change is a major threat to biodiversity. Large-scale analyses have generally focused on the impacts of climate change on the geographic ranges of species and on phenology, the timing of ecological phenomena. We used long-term monitoring of the abundance of breeding birds across Europe and the United States to produce, for both regions, composite population indices for two groups of species: those for which climate suitability has been either improving or declining since 1980. The ratio of these composite indices, the climate impact indicator (CII), reflects the divergent fates of species favored or disadvantaged by climate change. The trend in CII is positive and similar in the two regions. On both continents, interspecific and spatial variation in population abundance trends are well predicted by climate suitability trends., (Copyright © 2016, American Association for the Advancement of Science.)
- Published
- 2016
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.