21 results on '"Bogdanova, Maria I."'
Search Results
2. Quantifying annual spatial consistency in chick-rearing seabirds to inform important site identification
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Beal, Martin, Catry, Paulo, Phillips, Richard A., Oppel, Steffen, Arnould, John P.Y., Bogdanova, Maria I., Bolton, Mark, Carneiro, Ana P.B., Clatterbuck, Corey, Conners, Melinda, Daunt, Francis, Delord, Karine, Elliott, Kyle, Fromant, Aymeric, Granadeiro, José Pedro, Green, Jonathan A., Halsey, Lewis, Hamer, Keith C., Ito, Motohiro, Jeavons, Ruth, Kim, Jeong-Hoon, Kokubun, Nobuo, Koyama, Shiho, Lane, Jude V., Lee, Won Young, Matsumoto, Sakiko, Orben, Rachael A., Owen, Ellie, Paiva, Vitor H., Patterson, Allison, Pollock, Christopher J., Ramos, Jaime A., Sagar, Paul, Sato, Katsufumi, Shaffer, Scott A., Soanes, Louise, Takahashi, Akinori, Thompson, David R., Thorne, Lesley, Torres, Leigh, Watanuki, Yutaka, Waugh, Susan M., Weimerskirch, Henri, Whelan, Shannon, Yoda, Ken, Xavier, José C., and Dias, Maria P.
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- 2023
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3. Assessing the importance of individual‐ and colony‐level variation when using seabird foraging ranges as impact assessment and conservation tools.
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Cleasby, Ian R., Owen, Ellie, Butler, Adam, Baer, Julia, Blackburn, Jez, Bogdanova, Maria I., Coledale, Tessa, Daunt, Francis, Dodd, Stephen, Evans, Julian C., Green, Jonathan A., Guilford, Tim, Harris, Michael P., Hughes, Robert, Newell, Mark A., Newton, Stephen F., Robertson, Gail S., Ruffino, Lise, Shoji, Akiko, and Soanes, Louise M.
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ANIMAL tracks ,COLONIAL birds ,COLONIES (Biology) ,MARINE resources conservation ,ANALYSIS of variance ,ARTIFICIAL satellite tracking - Abstract
Knowledge of seabird distributions plays a key role in seabird conservation and sustainable marine management, underpinning efforts to designate protected areas or assess the impact of human developments. Technological advances in animal tracking devices increasingly allow researchers to acquire information on the movement of birds from specific colonies. Nevertheless, most seabird colonies have not been subject to such tracking and another means must be found to assess their likely foraging distribution. Consequently, foraging range data collated and summarized across other tracking studies has often been used to estimate species‐level foraging distances for use within applied settings. However, generic species‐specific foraging ranges must be used with caution because of the amount of variation in seabird foraging behaviour at both the individual and colony levels. Specifically, although current reviews of seabird foraging ranges provide summary estimates of maximum foraging range, they typically do not assess the extent of among‐colony or among‐individual variation around such estimates. To address this, we conducted a variance component analysis of the maximum distance reached from the breeding colony per foraging trip (foraging range) using multi‐colony tracking datasets to estimate the degree of between‐individual, between‐year and between‐colony variation in foraging range in four UK breeding seabirds (Black‐legged Kittiwake Rissa tridactyla, Common Guillemot Uria aalge, Razorbill Alca torda and European Shag Gulosus aristotelis). We also provide updated estimates of typical foraging ranges for each species and quantify the influence of breeding stage and colony size. Overall, between‐colony variation was typically the largest variance component, explaining 20–30% of the observed variation in foraging range across the four species. Individual‐level variation was also relatively large among Shag. In Kittiwake, Guillemot and Shag, but not Razorbill, average foraging ranges were positively associated with colony size. In addition, Kittiwake and Razorbill travelled further during incubation than during chick‐rearing. More generally, our estimates of mean foraging ranges for each species were subject to a high degree of uncertainty, which should be incorporated into impact assessments carried out using such data. [ABSTRACT FROM AUTHOR]
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- 2024
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4. Multi-colony tracking reveals spatio-temporal variation in carry-over effects between breeding success and winter movements in a pelagic seabird
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Bogdanova, Maria I., Butler, Adam, Wanless, Sarah, Moe, Børge, Anker-Nilssen, Tycho, Frederiksen, Morten, Boulinier, Thierry, Chivers, Lorraine S., Christensen-Dalsgaard, Signe, Descamps, Sébastien, Harris, Michael P., Newell, Mark, Olsen, Bergur, Phillips, Richard A., Shaw, Deryk, Steen, Harald, Strøm, Hallvard, Thórarinsson, Thorkell L., and Daunt, Francis
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- 2017
5. Multi‐colony tracking of two pelagic seabirds with contrasting flight capability illustrates how windscapes shape migratory movements at an ocean‐basin scale.
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Amélineau, Françoise, Tarroux, Arnaud, Lacombe, Simon, Bråthen, Vegard S., Descamps, Sebastien, Ekker, Morten, Fauchald, Per, Johansen, Malin K., Moe, Børge, Anker‐Nilssen, Tycho, Bogdanova, Maria I., Bringsvor, Ingar S., Chastel, Olivier, Christensen‐Dalsgaard, Signe, Daunt, Francis, Dehnhard, Nina, Einar Erikstad, Kjell, Ezhov, Aleksey, Gavrilo, Maria, and Hansen, Erpur S.
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Migration is a common trait among many animals allowing the exploitation of spatiotemporally variable resources. It often implies high energetic costs to cover large distances, for example between breeding and wintering grounds. For flying or swimming animals, the adequate use of winds and currents can help reduce the associated energetic costs. Migratory seabirds are good models because they dwell in habitats characterized by strong winds while undertaking very long migrations. We tested the hypothesis that seabirds migrate through areas with favourable winds. To that end, we used the SEATRACK dataset, a multi‐colony geolocator tracking dataset, for two North Atlantic seabirds with contrasting flight capabilities, the black‐legged kittiwake Rissa tridactyla and the Atlantic puffin Fratercula arctica, and wind data from the ERA5 climate reanalysis model. Both species had on average positive wind support during migration. Their main migratory routes were similar and followed seasonally prevailing winds. The general migratory movement had a loop‐shape at the scale of the North Atlantic, with an autumn route (southward) along the east coast of Greenland, and a spring route (northward) closer to the British Isles. While migrating, both species had higher wind support in spring than in autumn. Kittiwakes migrated farther and benefited from higher wind support than puffins on average. The variation in wind conditions encountered while migrating was linked to the geographical location of the colonies. Generally, northernmost colonies had a better wind support in autumn while the southernmost colonies had a better wind support in spring, with some exceptions. Our study helps understanding how the physical environment shapes animal migration, which is crucial to further predict how migrants will be impacted by ongoing environmental changes. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Corrigendum to “Quantifying annual spatial consistency in chick-rearing seabirds to inform important site identification” [Biol. Conserv. 281 (2023) 109994]
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Beal, Martin, Catry, Paulo, Phillips, Richard A., Oppel, Steffen, Arnould, John P.Y., Bogdanova, Maria I., Bolton, Mark, Carneiro, Ana P.B., Clatterbuck, Corey, Conners, Melinda, Daunt, Francis, Delord, Karine, Elliott, Kyle, Fromant, Aymeric, Granadeiro, José Pedro, Green, Jonathan A., Halsey, Lewis G., Hamer, Keith C., Ito, Motohiro, Jeavons, Ruth, Kim, Jeong-Hoon, Kokubun, Nobuo, Koyama, Shiho, Lane, Jude V., Lee, Won Young, Matsumoto, Sakiko, Orben, Rachael A., Owen, Ellie, Paiva, Vitor H., Patterson, Allison, Pollock, Christopher J., Ramos, Jaime A., Sagar, Paul, Sato, Katsufumi, Shaffer, Scott A., Soanes, Louise, Takahashi, Akinori, Thompson, David R., Thorne, Lesley, Torres, Leigh, Watanuki, Yutaka, Waugh, Susan M., Weimerskirch, Henri, Whelan, Shannon, Yoda, Ken, Xavier, José C., and Dias, Maria P.
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- 2023
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7. Among-year and within-population variation in foraging distribution of European shags Phalacrocorax aristotelis over two decades: Implications for marine spatial planning
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Bogdanova, Maria I., Wanless, Sarah, Harris, Michael P., Lindström, Jan, Butler, Adam, Newell, Mark A., Sato, Katsufumi, Watanuki, Yutaka, Parsons, Matt, and Daunt, Francis
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- 2014
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8. Multicolony tracking reveals the winter distribution of a pelagic seabird on an ocean basin scale
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Frederiksen, Morten, Moe, Børge, Daunt, Francis, Phillips, Richard A., Barrett, Robert T., Bogdanova, Maria I., Boulinier, Thierry, Chardine, John W., Chastel, Olivier, Chivers, Lorraine S., Christensen-Dalsgaard, Signe, Clément-Chastel, Céline, Colhoun, Kendrew, Freeman, Robin, Gaston, Anthony J., González-Solís, Jacob, Goutte, Aurélie, Grémillet, David, Guilford, Tim, Jensen, Gitte H., Krasnov, Yuri, Lorentsen, Svein-Håkon, Mallory, Mark L., Newell, Mark, Olsen, Bergur, Shaw, Deryk, Steen, Harald, Strøm, Hallvard, Systad, Geir H., Thórarinsson, Thorkell L., and Anker-Nilssen, Tycho
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- 2012
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9. Seasonal interactions in the black-legged kittiwake, Rissa tridactyla: links between breeding performance and winter distribution
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Bogdanova, Maria I., Daunt, Francis, Newell, Mark, Phillips, Richard A., Harris, Michael P., and Wanless, Sarah
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- 2011
10. Diagnosing the timing of demographic bottlenecks: sub-adult survival in red-billed choughs
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Reid, Jane M., Bignal, Eric M., Bignal, Sue, Bogdanova, Maria I., Monaghan, Pat, and McCracken, Davy I.
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- 2011
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11. Parent age, lifespan and offspring survival: structured variation in life history in a wild population
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Reid, Jane M., Bignal, Eric M., Bignal, Sue, McCracken, Davy I., Bogdanova, Maria I., and Monaghan, Pat
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- 2010
12. Sex-Specific Costs of Hatching Last: An Experimental Study on Herring Gulls (Larus argentatus)
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Bogdanova, Maria I. and Nager, Ruedi G.
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- 2008
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13. Age of the Incubating Parents Affects Nestling Survival: An Experimental Study of the Herring Gull Larus argentatus
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Bogdanova, Maria I., Nager, Ruedi G., and Monaghan, Pat
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- 2007
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14. Two observations of acorn barnacles attached to GLS loggers on seabirds in the North Atlantic:Barnacles on seabird GLS loggers
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Dunn, Ruth, Buckingham, Lila, Bogdanova, Maria I., Daunt, Francis, and Newell, Mark A.
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- 2021
15. Hywind Scotland Ornithological Monitoring Programme: Overwintering distributions of common guillemot and razorbill populations in Eastern Scotland
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Bogdanova, Maria I., Buckingham, Lila, Newell, Mark A., Wanless, Sarah, Harris, Mike P., Andrews, Chris, Morley, Tim, Weston, Ewan, Swann, Robert, Canham, Mick, Bennett, Sophie, Cox, Nicky, Quintin, Marine, and Daunt, Francis
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seabird ,geolocation ,offshore wind developments ,at-sea distribution - Abstract
The Hywind Scotland Pilot Park located off the east coast of Scotland has been in operation since 2017 and comprises five floating wind turbines with a total generating capacity of 30 MW. Ornithological monitoring is required as part of the Marine Licence for the wind farm and is carried out in conjunction with a large-scale seabird monitoring and research programme in north-western Europe (SEATRACK) involving the deployment of geolocation loggers to obtain seabird location estimates throughout the winter. Of particular concern are two species of auks (common guillemot Uria aalge and razorbill Alca torda) known to be highly vulnerable to displacement and barrier effects from offshore renewable developments. As part of the Hywind Scotland’s ornithological monitoring, data on year-round distribution and movements of guillemots and razorbills at three major colonies along the east coast of Scotland (East Caithness SPA, Buchan Ness to Collieston Coast SPA and Isle of May National Nature Reserve) were collected over two years (2017-18 and 2018-19). In 2017, a total of 190 geolocation loggers were deployed at the three study colonies. During the 2018 breeding season, a total of 82 loggers were retrieved and 193 new data loggers were deployed. During the 2019 breeding season a total of 102 loggers were retrieved, including several deployed in the first year. We obtained reasonable sample sizes in all cases (range 11-28) except razorbills at Buchan Ness to Collieston Coast, where only five loggers were retrieved each year. The geolocation data were processed using a probabilistic method to obtain two locations per day for each bird throughout the non-breeding period. The geolocation data were analysed to determine utilisation distributions for each species at each colony in 2017-18 and 2018-19. Overlap in distributions was quantified and minimum adequate sample size of tracked birds was examined. For both species, the distribution of birds from the three study colonies was similar at a broad spatial scale, with key wintering areas located around the colonies and in the central and southern parts of the North Sea. In guillemots, among-colony spatial similarity in kernel densities was generally high throughout the non-breeding period. In razorbills, spatial similarity among colonies was highest in the post-breeding period and lowest in late winter. Our results indicate that the three populations of guillemots and razorbills had a similar overall non-breeding distribution, with extensive use of the central and southern North Sea and areas around the breeding colonies, and this was broadly consistent between years. However, in both species there were important differences among colonies in the location of hotspots during the non-breeding period. The data provide important insights into the year-round space use of these two key species at three major colonies on the east coast of Scotland and their potential interaction with offshore renewable developments.
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- 2021
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16. Energetic synchrony throughout the non‐breeding season in common guillemots from four colonies.
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Buckingham, Lila, Daunt, Francis, Bogdanova, Maria I., Furness, Robert W., Bennett, Sophie, Duckworth, James, Dunn, Ruth E., Wanless, Sarah, Harris, Michael P., Jardine, David C., Newell, Mark A., Ward, Robin M., Weston, Ewan D., and Green, Jonathan A.
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MOLTING ,SYNCHRONIC order ,COLONIES (Biology) ,POPULATION dynamics ,STABLE isotopes ,BIRD populations ,SEASONS - Abstract
The non‐breeding season presents significant energetic challenges to birds that breed in temperate or polar regions, with clear implications for population dynamics. In seabirds, the environmental conditions at non‐breeding sites drive food availability and the energetic cost of regulatory processes, resulting in variation in diet, behaviour and energetics; however, very few studies have attempted to understand if and how these aspects vary between populations. We investigated whether non‐breeding location influenced diet, behaviour and energetics in the common guillemot Uria aalge. We studied guillemots from four UK breeding colonies, two located on the west coast of Scotland and two on the east. We quantified non‐breeding distribution, foraging behaviour and activity budgets of 39 individuals from July to March, using geolocation–immersion loggers and time‐depth recorders, and used feather stable isotope signatures to infer diet during the post‐breeding moult. We calculated energy expenditure and investigated whether the peak (an indicator of the potential vulnerability to marine threats) varied between colonies. Individuals were spatially segregated according to the coastline they breed on, with west coast guillemots distributed off the west coast of the UK and east coast guillemots distributed off the east coast. Diet and behaviour were more similar in guillemots that shared a breeding coastline than those that did not, as west coast guillemots foraged at a lower trophic level, spent less time diving and engaged in more pelagic foraging than east coast guillemots. However, energy expenditure was remarkably similar between colonies, peaking during late February/early March, indicating that, during our study period, there was high synchrony between colonies in the timing of potential vulnerability to marine threats. Therefore, any anthropogenic changes that result in decreased food availability or increased energy expenditure during late winter may have greater impacts on energy balance, with consequences for population dynamics. [ABSTRACT FROM AUTHOR]
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- 2023
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17. Opposing effects of spatiotemporal variation in resources and temporal variation in climate on density dependent population growth in seabirds.
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Searle, Kate R., Butler, Adam, Waggitt, James J., Evans, Peter G. H., Bogdanova, Maria I, Hobbs, N. Thompson, Daunt, Francis, and Wanless, Sarah
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CLIMATE change ,POPULATION density ,COLONIES (Biology) ,COLONIAL birds ,ANIMAL populations ,ANIMAL population density - Abstract
Understanding how ecological processes combine to shape population dynamics is crucial in a rapidly changing world. Evidence has been emerging for how fundamental drivers of density dependence in mobile species are related to two differing types of environmental variation—temporal variation in climate, and spatiotemporal variation in food resources. However, to date, tests of these hypotheses have been largely restricted to mid‐trophic species in terrestrial environments and thus their general applicability remains unknown.We tested if these same processes can be identified in marine upper trophic level species. We assembled a multi‐decadal data set on population abundance of 10 species of colonial seabirds comprising a large component of the UK breeding seabird biomass, and covering diverse phylogenies, life histories and foraging behaviours.We tested for evidence of density dependence in population growth rates using discrete time state‐space population models fit to long time‐series of observations of abundance at seabird breeding colonies. We then assessed if the strength of density dependence in population growth rates was exacerbated by temporal variation in climate (sea temperature and swell height), and attenuated by spatiotemporal variation in prey resources (productivity and tidal fronts).The majority of species showed patterns consistent with temporal variation in climate acting to strengthen density dependent feedbacks to population growth. However, fewer species showed evidence for a weakening of density dependence with increasing spatiotemporal variation in prey resources.Our findings extend this emerging theory for how different sources of environmental variation may shape the dynamics and regulation of animal populations, demonstrating its role in upper trophic marine species. We show that environmental variation leaves a signal in long‐term population dynamics of seabirds with potentially important consequences for their demography and trophic interactions. [ABSTRACT FROM AUTHOR]
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- 2022
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18. Inter-year differences in survival of Atlantic puffins Fratercula arctica are not associated with winter distribution
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Harris, Michael P., Daunt, Francis, Bogdanova, Maria I., Lahoz-Monfort, Jose J., Newell, Mark A., Phillips, Richard A., and Wanless, Sarah
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Survival -- Research ,Animal wintering -- Research ,Atlantic puffin -- Distribution ,Company distribution practices ,Biological sciences - Abstract
Miniature geolocator loggers (Global Location Sensing, GLS) that provide daily locations of birds have revolutionised the study of winter ecology and migration patterns of seabirds. A long-term study of ringing recoveries and analyses of heavy metals and pollutants in tissues of Atlantic puffins Fratercula arctica from the Isle of May, south-east Scotland, suggested that this population wintered mainly within the North Sea. However, deployment of GLS devices over the 2007/2008 winter showed that many breeding birds made major excursions into the east Atlantic. This winter was the second of two when survival was extremely low (survival in 2006/2007 and 2007/2008 was 0.696 and 0.695, respectively, compared to the average of 0.922 over the period 1984/1985-2005/2006). These low rates of survival suggested that the unexpected use of the Atlantic might have been associated with unusually poor conditions in the North Sea as indicated by very low breeding success in 2007. Survival rate returned to previous levels in 2008/2009 providing the opportunity to test whether higher survival was associated with birds remaining in the North Sea, or whether movements into the Atlantic are a feature of this population unrelated to survival. Accordingly, geolocators were deployed over the 2009/2010 winter when adult survival was subsequently established to be high (0.913). We found greater support for the hypothesis that winter distribution is not associated with survival. Thus, 8 (40 %) of 20 individuals followed in 2009/2010 went into the Atlantic, a rate not significantly different from 11 (58 %) of the 19 followed in the 2007/2008 winter. Indeed, birds actually spent longer in the Atlantic and used a wider variety of areas in 2009/2010, although the time spent away from the colony was significantly shorter than in 2007/2008. Since our data were from individuals that survived, remaining in or moving out of the North Sea can both be successful strategies during winters when the population as a whole shows either high or low survival rates. Unfortunately, we do not know where birds that died had gone, and hence, the relative survival of birds that did or did not move into the Atlantic. Determining the link between survival and wintering area for any seabird remains a formidable challenge and will have to await the development of technologies that can determine both where and when birds die., Introduction Although the breeding biology of many seabirds is well documented, until recently there was a major gap in our knowledge of seabird migration and wintering areas. What little information [...]
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- 2013
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19. Modelling and mapping how common guillemots balance their energy budgets over a full annual cycle.
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Dunn, Ruth E., Green, Jonathan A., Wanless, Sarah, Harris, Mike P., Newell, Mark A., Bogdanova, Maria I., Horswill, Catharine, Daunt, Francis, and Matthiopoulos, Jason
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OCEAN temperature ,CALORIC expenditure ,ANIMAL populations ,SEVERE storms ,ENERGY budget (Geophysics) ,REPRODUCTION ,POPULATION dynamics ,BAYESIAN analysis - Abstract
The ability of individual animals to balance their energy budgets throughout the annual cycle is important for their survival, reproduction and population dynamics. However, the annual cycles of many wild, mobile animals are difficult to observe and our understanding of how individuals balance their energy budgets throughout the year therefore remains poor.We developed a hierarchical Bayesian state‐space model to investigate how key components of animal energy budgets (namely individual energy gain and storage) varied in space and time. Our model used biologger‐derived estimates of time‐activity budgets, locations and energy expenditure to infer year‐round time series of energy income and reserves. The model accounted for seasonality in environmental drivers such as sea surface temperature and daylength, allowing us to identify times and locations of high energy gain.Our study system was a population of common guillemots Uria aalge breeding at a western North Sea colony. These seabirds manage their energy budgets by adjusting their behaviour and accumulating fat reserves. However, typically during severe weather conditions, birds can experience an energy deficit over a sustained period, leading to starvation and large‐scale mortality events.We show that guillemot energy gain varied in both time and space. Estimates of guillemot body mass varied throughout the annual cycle and birds periodically experienced losses in mass. Mass losses were likely to have either been adaptive, or due to energetic bottlenecks, the latter leading to increased susceptibility to mortality. Guillemots tended to be lighter towards the edge of their spatial distribution.We describe a framework that combines biologging data, time‐activity budget analysis and Bayesian state‐space modelling to identify times and locations of high energetic reward or potential energetic bottlenecks in a wild animal population. Our approach can be extended to address ecological and conservation‐driven questions that were previously unanswerable due to logistical complexities in collecting data on wild, mobile animals across full annual cycles. Read the free Plain Language Summary for this article on the Journal blog. [ABSTRACT FROM AUTHOR]
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- 2022
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20. The importance of observer effort on the accuracy of breeding success estimates in the Common Guillemot Uria aalge.
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Harris, Mike P., Heubeck, Martin, Bogdanova, Maria I., Newell, Mark A., Wanless, Sarah, and Daunt, Francis
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Capsule: A data-thinning approach was used to assess the effects of reducing the frequency of nest-checks on estimates of breeding success of Common Guillemots Uria aalge. Inter-year and inter-colony differences in fledging age and their implications for setting a minimum age after which a chick could be assumed to have fledged were evaluated. Aims: To assess the consequences of reducing sampling frequency on the estimation of breeding success, and on the robustness of the assumption that breeding has been successful if a chick survives to 15 days old. Methods: Breeding success, ages at fledging and loss of chicks were estimated from daily checks at two Scottish colonies over a six-year period. Data-thinning was used to assess the consequences of reducing checks from daily to every two or three days. Breeding success was recalculated assuming that all chicks surviving to 15 days fledged. Results: Reducing the frequency of checks from daily to every second or third day resulted in a small but statistically significant increase in the estimate of success. Between 20% and 25% of chick losses occurred when chicks were ≥15 days old. Assuming that these chicks had fledged resulted in significant increases in breeding success. Conclusion: Assumptions about whether or not a chick fledged had a greater impact on the estimate of breeding success than reducing the frequency of nest-checks from daily to every second or third day. There was no threshold age after which a chick could be assumed to have fledged. These findings are relevant to other monitoring schemes where there is pressure to reduce input. Sampling methods used in monitoring schemes need to be clearly stated and changes in protocols documented so that sampling effects can be incorporated into future analyses. [ABSTRACT FROM AUTHOR]
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- 2020
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21. Drivers of Interspecific Spatial Segregation in Two Closely‐Related Seabird Species at a Pan‐Atlantic Scale.
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Bonnet‐Lebrun, Anne‐Sophie, Matthiopoulos, Jason, Lemaire‐Patin, Rémi, Deville, Tanguy, Barrett, Robert, Bogdanova, Maria I., Bolton, Mark, Christensen‐Dalsgaard, Signe, Daunt, Francis, Dehnhard, Nina, Descamps, Sébastien, Elliott, Kyle, Erikstad, Kjell Einar, Frederiksen, Morten, Gilchrist, Grant, Harris, Mike, Kolbeinsson, Yann, Linnebjerg, Jannie Fries, Lorentsen, Svein‐Håkon, and Mallory, Mark
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HABITAT selection , *SYMPATRIC speciation , *SPECIES , *HABITATS , *HYPOTHESIS , *COMPETITION (Biology) - Abstract
ABSTRACT Aim Location Taxa Methods Results Main Conclusions Ecologically similar species living in sympatry are expected to segregate to reduce the effects of competition where resources are limiting. Segregation from heterospecifics commonly occurs in space, but it is often unknown whether such segregation has underlying environmental causes. Indeed, species could segregate because of different fundamental environmental requirements (i.e., ‘niche divergence’), because competitive exclusion at sympatric sites can force species to either change the habitat use they would have at allopatric sites (i.e., ‘niche displacement’) or to avoid certain areas, independently of habitat (i.e., ‘spatial avoidance’). Testing these hypotheses requires the comparison between sympatric and allopatric sites. Understanding the competitive mechanisms that underlie patterns of spatial segregation could improve predictions of species responses to environmental change, as competition might exacerbate the effects of environmental change.North Atlantic and Arctic.Common guillemots Uria aalge and Brünnich's guillemots Uria lomvia.Here, we examine support for these explanations for spatial segregation in two closely‐related seabird species, common guillemots (Uria aalge) and Brünnich's guillemots (U. lomvia). For this, we collated a pan‐Atlantic data set of breeding season foraging tracks from 1046 individuals, collected from 20 colonies (8 sympatric and 12 allopatric). These were analysed with habitat models in a spatially transferable framework to compare habitat preferences between species at sympatric and allopatric sites.We found no effect of the distribution of heterospecifics on local habitat preferences of the focal species. We found differences in habitat preferences between species, but these were not sufficient to explain the observed levels of spatial segregation at sympatric sites.Assuming we did not omit any relevant environmental variables, these results suggest a mix of niche divergence and spatial avoidance produces the observed patterns of spatial segregation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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