19 results on '"Kallianiotis, Argyris A."'
Search Results
2. Identification of hake distribution pattern and nursery grounds in the Hellenic seas by means of generalized additive models
- Author
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Tserpes, George, Politou, Chrissi-Yianna, Peristeraki, Panagiota, Kallianiotis, Argyris, and Papaconstantinou, Costas
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- 2008
- Full Text
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3. MEDLEM database, a data collection on large Elasmobranchs in the Mediterranean and Black seas
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Mancusi, C., Baino, R., Fortuna, C., Gil de Sola, Luis, Morey Vert, Gabriel, Nejmeddine, M., Kallianiotis, Argyris, Soldo, A., Hemida, F., Alisabata, A., Castellano, L., Garibaldi, Fulvio, Lanteri, L., Tinti, Fausto, Charilaou, Charis, Juan Abella, Álvaro, Serena, Fabrizio, Mancusi, C., Baino, R., Fortuna, C., Gil de Sola, Luis, Morey Vert, Gabriel, Nejmeddine, M., Kallianiotis, Argyris, Soldo, A., Hemida, F., Alisabata, A., Castellano, L., Garibaldi, Fulvio, Lanteri, L., Tinti, Fausto, Charilaou, Charis, Juan Abella, Álvaro, and Serena, Fabrizio
- Abstract
The Mediterranean Large Elasmobranchs Monitoring (MEDLEM) database contains more than 3,000 records (with more than 4,000 individuals) of large elasmobranch species from 21 different countries around the Mediterranean and Black seas, observed from 1666 to 2017. The principal species included in the archive are the devil ray (1,868 individuals), the basking shark (935 individuals), the blue shark (622 individuals), and the great white shark (342 individuals). In the last decades, other species such as the thresher shark (187 individuals), the shortfin mako (180 individuals), and the spiny butterfly ray (138) were reported with increasing frequency. This was possibly due to increased public awareness on the conservation status of sharks, and the consequent development of new monitoring programs. MEDLEM does not have homogeneous reporting coverage throughout the Mediterranean and Black seas and it should be considered as a database of observed species presence. Scientific monitoring efforts in the south-eastern Mediterranean and Black seas are generally lower than in the northern sectors and the absence of some species in our database does not imply their actual absence in these regions. However,the available data allowed us to analyse the frequency and spatial distribution of records, the size frequencies for a few selected species, the overall area coverage, and which species are involved as bycatch by different fishing gears.
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- 2020
4. Periodic, spatially structured matrix model for the study of anchovy ( Engraulis encrasicolus) population dynamics in N Aegean Sea (E. Mediterranean)
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Mantzouni, Irene, Somarakis, Stylianos, Moutopoulos, Dimitrios K., Kallianiotis, Argyris, and Koutsikopoulos, Constantin
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- 2007
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5. Diet of Silver scabbardfish Lepidopus caudatus (Euphrasen, 1788) in the Northern Aegean Sea
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TORRE, Michele, SICURO, Benedetto, and KALLIANIOTIS, Argyris
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Feeding behavior ,Lepidopus caudatus ,North Aegean Sea ,Diet ,Trophic level - Abstract
This study is based on the results of an extensive research carried out on silver scabbardfish Lepidopus caudatus from 2003 to 2005 in the Northern Aegean Sea (NAS). Data were collected from both commercial fisheries and research bottom trawl surveys. 264 specimens of silver scabbardfish, caught between 200 and 600 m depth, were processed for diet analysis. The silver scabbardfish diet covers different trophic levels, including euphausiids, decapods, fish and cephalopods. Overall, euphausiids were found to be the most important prey. Ontogenetically, the L.caudatus diet gradually changed from crustaceans, consumed by the smaller individuals to fish and cephalopods. During the sampling period, radical changes in the diet composition were observed: from euphausiids to fish between 2003 and 2004 and from fish to decapoda, euphausiids and cephalopods between 2004 and 2005. During 2004, feeding on high trophic level preys was attributed to lack of euphausiids. It was suggested that euphausiids play a crucial role in the energy transfer between lower and higher trophic levels in the deep demersal areas of the NAS.
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- 2019
6. Mesozooplankton distribution in relation to hydrology of the Northeastern Aegean Sea, Eastern Mediterranean
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Isari, Stamatina, Ramfos, Alexis, Somarakis, Stylianos, Koutsikopoulos, Constantin, Kallianiotis, Argyris, and Fragopoulu, Nina
- Published
- 2006
7. Bioaccumulation Levels and Potential Health Risks of Mercury, Cadmium, and Lead in Albacore (Thunnus alalunga, Bonnaterre, 1788) from The Aegean Sea, Greece
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Stamatis, Nikolaos, primary, Kamidis, Nikolaos, additional, Pigada, Pelagia, additional, Stergiou, Despoina, additional, and Kallianiotis, Argyris, additional
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- 2019
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8. Succession in megafaunal assemblages of an artificial reef during a three-year monitoring in the Eastern Mediterranean basin
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Anastasiadou, Chryssa, primary, Kamidis, Nikolaos, additional, Vidoris, Pavlos, additional, Kallianiotis, Athanassios, additional, and Kallianiotis, Argyris, additional
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- 2019
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9. Epibenthic Communities on Artificial Reefs in Greece, Mediterranean Sea
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Achilleos, Katerina, primary, Patsalidou, Maria, additional, Jimenez, Carlos, additional, Kamidis, Nikolaos, additional, Georgiou, Andreas, additional, Petrou, Antonis, additional, and Kallianiotis, Argyris, additional
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- 2018
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10. Correction: Large-Scale Diversity of Slope Fishes: Pattern Inconsistency between Multiple Diversity Indices
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Gaertner, Jean-Claude, primary, Maiorano, Porzia, additional, Mérigot, Bastien, additional, Colloca, Francesco, additional, Politou, Chrissi-Yianna, additional, De Sola, Luis Gil, additional, Bertrand, Jacques A., additional, Murenu, Matteo, additional, Durbec, Jean-Pierre, additional, Kallianiotis, Argyris, additional, and Mannini, Alessandro, additional
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- 2018
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11. Large-scale spatio-temporal monitoring highlights hotspots of demersal fish diversity in the Mediterranean Sea
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Granger, Victoria, Fromentin, Jean-marc, Bez, Nicolas, Relini, Giulio, Meynard, Christine N., Gaertner, Jean-claude, Maiorano, Porzia, Garcia Ruiz, Cristina, Follesa, Cristina, Gristina, Michele, Peristeraki, Panagiota, Brind'Amour, Anik, Carbonara, Pierluigi, Charilaou, Charis, Esteban, Antonio, Jadaud, Angelique, Joksimovic, Aleksandar, Kallianiotis, Argyris, Kolitari, Jerina, Manfredi, Chiara, Massuti, Enric, Mifsud, Roberta, Quetglas, Antoni, Refes, Wahid, Sbrana, Mario, Vrgoc, Nedo, Spedicato, Maria Teresa, Merigot, Bastien, Granger, Victoria, Fromentin, Jean-marc, Bez, Nicolas, Relini, Giulio, Meynard, Christine N., Gaertner, Jean-claude, Maiorano, Porzia, Garcia Ruiz, Cristina, Follesa, Cristina, Gristina, Michele, Peristeraki, Panagiota, Brind'Amour, Anik, Carbonara, Pierluigi, Charilaou, Charis, Esteban, Antonio, Jadaud, Angelique, Joksimovic, Aleksandar, Kallianiotis, Argyris, Kolitari, Jerina, Manfredi, Chiara, Massuti, Enric, Mifsud, Roberta, Quetglas, Antoni, Refes, Wahid, Sbrana, Mario, Vrgoc, Nedo, Spedicato, Maria Teresa, and Merigot, Bastien
- Abstract
Increasing human pressures and global environmental change may severely affect the diversity of species assemblages and associated ecosystem services. Despite the recent interest in phylogenetic and functional diversity, our knowledge on large spatio-temporal patterns of demersal fish diversity sampled by trawling remains still incomplete, notably in the Mediterranean Sea, one of the most threatened marine regions of the world. We investigated large spatio-temporal diversity patterns by analysing a dataset of 19,886 hauls from 10 to 800 m depth performed annually during the last two decades by standardized scientific bottom trawl field surveys across the Mediterranean Sea, within the MEDITS program. A multi-component (eight diversity indices) and multi-scale (local assemblages, biogeographic regions to basins) approach indicates that only the two most traditional components (species richness and evenness) were sufficient to reflect patterns in taxonomic, phylogenetic or functional richness and divergence. We also put into question the use of widely computed indices that allow comparing directly taxonomic, phylogenetic and functional diversity within a unique mathematical framework. In addition, demersal fish assemblages sampled by trawl do not follow a continuous decreasing longitudinal/latitudinal diversity gradients (spatial effects explained up to 70.6% of deviance in regression tree and generalized linear models), for any of the indices and spatial scales analysed. Indeed, at both local and regional scales species richness was relatively high in the Iberian region, Malta, the Eastern Ionian and Aegean seas, meanwhile the Adriatic Sea and Cyprus showed a relatively low level. In contrast, evenness as well as taxonomic, phylogenetic and functional divergences did not show regional hotspots. All studied diversity components remained stable over the last two decades. Overall, our results highlight the need to use complementary diversity indices through different spa
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- 2015
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12. Descartes de la pesca de cerco enfocadas en peces pequeños pelágicos en el mar Mediterráneo Oriental
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Tsagarakis, Konstantinos, Vassilopoulou, Vassiliki, Kallianiotis, Argyris, and Machias, Athanassios
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purse seine fishery ,small pelagic fish ,lengths at discarding ,commercial species ,Aegean Sea ,Ionian Sea ,pesca de cerco ,pequeñas especies pelágicas ,longitud al momento del descarte ,especies comerciales ,mar Egeo ,mar Jónico - Abstract
We analysed data collected on board commercial purse seine vessels in the Aegean and Ionian Seas (eastern Mediterranean Sea, Greece) in 13 seasonal sampling periods from 2003 to 2008 in order to describe the composition of the retained and discarded catch and shed light on discarding practices. In each area, five species constituted the majority of the marketable catch (> 97%): sardine (Sardina pilchardus), anchovy (Engraulis encrasicolus), round sardinella (Sardinella aurita), bogue (Boops boops) (in both areas), mackerel (Scomber japonicus; in the Aegean Sea) and picarel (Spicara smaris; in the Ionian Sea). Discarded quantities were on average 4.6% and 2.2% of the total catch in terms of weight in the Aegean and Ionian Seas respectively. Discards on the marketable ratio fluctuated over years and seasons without showing any particular trend. At the species level, sardine and mackerel were seldom discarded while large amounts of anchovy were discarded only during its recruitment period (autumn), when juvenile fish dominate the population. The discarding ratio for bogue, picarel and round sardinella ranged from zero to total discarding because they constitute a supplementary source of income for the fishers. Discarded fish comprised mainly small individuals for all species considered with the exception of round sardinella. However, the lengths at which 50% of the individuals were discarded were generally small, often smaller than the species minimum landing sizes. Geographical coordinates and marketable catch explained part of the variability of the discarded quantities, as revealed by generalized additive models. Discarding practices and implications for management of purse seine fisheries are also discussed., Analizamos datos recogidos a bordo de pesqueros comerciales de cerco en el mar Egeo y el mar Jónico (Mediterráneo Oriental, Grecia) durante 13 estacionales de muestreo desde 2003 hasta 2008, con el objetivo de describir la composición de las capturas conservadas y de las descartadas con el fin de arrojar luz sobre la práctica del descarte. En cada zona, la mayor parte de la captura comercial (> 97%) consistía en cinco especies, a saber: la sardina (Sardina pilchardus), el boquerón (Engraulis encrasicolus), la alacha (Sardinella aurita), la boga (Boops boops) (en ambas zonas), la caballa (Scomber japonicus; en el mar Egeo) y el caramel (Spicara smaris; en el mar Jónico). Las cantidades descartadas representaban un promedio del 4.6% y 2.2% de la captura total en términos de peso, en el mar Egeo y en el Jónico respectivamente. La proporción de la captura descartada sobre la captura comercializable fluctuó mucho en todos los años y estaciones sin mostrar ninguna tendencia particular. Con respecto a las especies, en el caso de la sardina y de la caballa, los descartes ocurrieron raramente e incluso los individuos más pequeños se conservaron, mientras que grandes cantidades de boquerón fueron descartadas solamente durante su temporada de reclutamiento (otoño), cuando la población está dominada por peces jóvenes. La proporción descartada en el caso de la boga, del caramel y de la alacha fluctuó mucho, desde un descarte de cero hasta un descarte total, ya que estas especies representan una fuente de ingresos complementaria para los pescadores. Las coordenadas geográficas y la captura comercial explicaban parte de la variabilidad de las cantidades descartadas, como se demuestra con modelos aditivos generalistas. Asimismo, presentamos una discusión sobre la práctica del descarte así como de las consecuencias sobre la gestión de la pesca de cerco.
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- 2012
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13. Diet of five cetacean species in the north Aegean Sea (Greece)
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Milani, Cristina, Vella, Adriana, Vidoris, Pavlos, Christidis, Aris, Kallianiotis, Argyris, and 25th European Cetacean Society Conference
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Bottlenose dolphin -- Greece ,Cetacea -- North Aegean Sea ,Common dolphin ,Cetacea -- Greece ,Harbor porpoise -- Greece -- Geographical distribution ,Risso's dolphin - Abstract
Few records on cetaceans’ distribution are available for the North Aegean Sea and no research on diet has been attempted up to now. The present study, based on stomach content analysis of stranded animals, aims to fill the lack of data on cetaceans’ feeding habits in the area. Out of the 32 cetaceans stranded since 2002 from Strimonikos Gulf in Chalkidiki to Alexandroupoli on the Turkish border, stomachs’ samples were collected whenever possible. The stranded specimens belong to five species: Bottlenose dolphin (Tursiops truncatus), Common dolphin (Delphinus delphis), Striped dolphin (Stenella coeruleoalba), Risso’s dolphin (Grampus griseus) and Harbour porpoise (Phocoena phocoena)., N/A
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- 2011
14. Age, growth, mortality, reproduction and feeding habits of the striped seabream, Lithognathus mormyrus (Pisces: Sparidae) in the coastal waters of the Thracian Sea, Greece
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Kallianiotis, Argyris, Torre, Michele, and Argyri, Anna
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herrera ,Lithognathus mormyrus ,Mediterráneo oriental ,edad ,crecimiento ,mortalidad ,reproducción ,alimentación ,northeastern Mediterranean ,age ,growth ,mortality ,reproduction ,feeding - Abstract
Age, growth, mortality, reproduction and feeding habits were analysed for Lithognathus mormyrus collected in the coastal waters of the Thracian Sea from November 1997 to September 1999. Specimens ranged from 42 to 341 mm in total length. Weight increased with size allometrically (b = 3.242) for immature individuals and isometrically (b = 2.960) for males, females and intersexuals. Growth was described by the standard form of the von Bertalanffy growth equation and the estimated parameters were k = 0.21, t0 = –0.996 and L? = 309.4. Total and natural instantaneous rate of mortality was found to be Z = 0.79 year-1 and M = 0.61 year-1. Sex inversion occurred mainly between 210 and 300 mm (4-9 age classes). Males reached sexual maturity at 162.1 mm (2.5 years) and females at 190.40 mm (3.6 years). The spawning period occurred from May to September, while the gamete emission peaked in June-August. Stomach content analysis revealed that L. mormyrus is a carnivorous species feeding on benthic invertebrates, mainly polychaeta and bivalve molluscs. Ontogenetic variation in the diet composition showed that while growing, the fish become more generalist feeders. We also found that in the summer season the fish become more selective feeders., La edad, crecimiento, reproducción y alimentación de Lithognathus mormyrus capturados en aguas costeras del mar de Trácia entre noviembre 1997 y septiembre 1999 han sido analizadas. La talla total de los especímenes osciló entre 42 y 341 mm. El peso aumentó con la talla alométricamente (b=3.242) para los individuos inmaduros e isométricamente (b=2.960) para machos, hembras e intersexuales. El crecimiento ha sido descrito mediante la forma estándar de la ecuación de crecimiento de von Bertalanffy; los parámetros estimados han sido: k=0.21, t0 =–0.996 y L? =309.4. La tasa instantánea de mortalidad total y natural ha sido Z=0.79 año-1 y M=0.61 año-1. La inversión de sexo tuvo lugar principalmente entre 210 y 300 mm (clases de edad 4-9). Los machos alcanzaron la madurez sexual a 162.1 mm (2.5 años) y las hembras a 190.4 mm (3.6 años). El período de puesta tuvo lugar entre mayo y septiembre, con un pico en junio-agosto. El análisis de contenidos estomacales reveló que L. mormyrus es una especie carnívora que se alimenta de invertebrados bentónicos, principalmente de poliquetos y moluscos bivalvos. La variación ontogenética en la composición de la dieta mostró que a lo largo del crecimiento los individuos devienen generalistas. Estacionalmente, se ha encontrado que en verano los individuos devienen más selectivos.
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- 2005
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15. Temporal patterns of larval fish distribution and abundance in a coastal area of northern Greece
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Koutrakis, Emmanuel T., Kallianiotis, Argyris A., and Tsikliras, Athanassios C.
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patrones estacionales, abundancia ,diversidad ,larvas de peces ,Grecia ,seasonal patterns ,abundance ,diversity ,fish larvae ,Greece - Abstract
Species composition, abundance and diversity of fish larvae were assessed in the Strymonikos and Ierissos Gulfs (northern Aegean Sea, Greece). Both gulfs are affected by the freshwater input of the Rivers Strymon and Rihios; water depth does not exceed 80 m. Samples were collected using a bongo net sampler (250 µm mesh size) over a grid of 35 stations in six cruises between June 1997 and May 1998. A total of 48 taxa of fish larvae (36 species, 5 genera and 7 families) were identified. The majority of identified fish larvae taxa consisted of demersal species that included larvae of Bothidae, Gobiidae, Callionymidae, Sparidae and Serranidae. The highest number of species occurred in the warm season (May, June, July, September) and this was attributed to the summer spawners that start their reproduction period during spring/early summer. The European anchovy (Engraulis encrasicolus) was the dominant species between July and September, and the European sardine (Sardina pilchardus) between November and March. Two distinct seasons (warm and cold) were identified by multivariate analysis, highlighting the importance of seasonality in shaping the community structure. The absence of well-defined larval fish associations revealed the importance of depth in the identification of different spatial patterns in an area., Se evaluaron la composición, abundancia y diversidad de las larvas de peces en los golfos de Strymonikos y Ierissos (norte del mar Egeo, Grecia). Ambos golfos están afectados por la llegada de agua dulce de los ríos Strymon y Rihios y, en ellos, la profundidad no supera los 80 m. Las muestras se recolectaron en seis campañas realizadas entre los meses de junio de 1997 y mayo de 1998, sobre una parrilla de 35 estaciones, utilizando una red Bongo (con malla de 250 µm). Entre las larvas de peces se identificó un total de 48 taxa (36 especies, 5 géneros y 7 familias). La mayoría de las larvas identificadas correspondieron a especies demersales de las familias Bothidae, Gobiidae, Callionymidae, Sparidae y Serranidae. El número más alto de especies apareció durante la estación cálida (mayo, junio, julio y septiembre) y esto se atribuyó a los ponedores de verano que inician su periodo de reproducción en primavera/principio de verano. La anchoa europea (Engraulis encrasicolus) fue la especie dominante de julio a septiembre, y la sardina europea (Sardina pilchardus) de noviembre a marzo. Mediante análisis multivariante se identificaron dos estaciones distintas (cálida y fría), destacando la importancia de la estacionalidad en la estructuración de la comunidad. La ausencia de asociaciones de larvas bien definidas reveló la importancia de la profundidad en la identificación de diferentes patrones espaciales en el área.
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- 2004
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16. Large-Scale Diversity of Slope Fishes: Pattern Inconsistency between Multiple Diversity Indices
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Gaertner, Jean-claude, Maiorano, Porza, Merigot, Bastien, Colloca, Francesco, Politou, Chrissi-yianna, Gil De Sola, Luis, Bertrand, Jacques, Murenu, Matteo, Durbec, Jean-pierre, Kallianiotis, Argyris, Mannini, Alessandro, Gaertner, Jean-claude, Maiorano, Porza, Merigot, Bastien, Colloca, Francesco, Politou, Chrissi-yianna, Gil De Sola, Luis, Bertrand, Jacques, Murenu, Matteo, Durbec, Jean-pierre, Kallianiotis, Argyris, and Mannini, Alessandro
- Abstract
Large-scale studies focused on the diversity of continental slope ecosystems are still rare, usually restricted to a limited number of diversity indices and mainly based on the empirical comparison of heterogeneous local data sets. In contrast, we investigate large-scale fish diversity on the basis of multiple diversity indices and using 1454 standardized trawl hauls collected throughout the upper and middle slope of the whole northern Mediterranean Sea (36 degrees 3' - 45 degrees 7' N; 5 degrees 3'W - 28 degrees E). We have analyzed (1) the empirical relationships between a set of 11 diversity indices in order to assess their degree of complementarity/redundancy and (2) the consistency of spatial patterns exhibited by each of the complementary groups of indices. Regarding species richness, our results contrasted both the traditional view based on the hump-shaped theory for bathymetric pattern and the commonly-admitted hypothesis of a large-scale decreasing trend correlated with a similar gradient of primary production in the Mediterranean Sea. More generally, we found that the components of slope fish diversity we analyzed did not always show a consistent pattern of distribution according either to depth or to spatial areas, suggesting that they are not driven by the same factors. These results, which stress the need to extend the number of indices traditionally considered in diversity monitoring networks, could provide a basis for rethinking not only the methodological approach used in monitoring systems, but also the definition of priority zones for protection. Finally, our results call into question the feasibility of properly investigating large-scale diversity patterns using a widespread approach in ecology, which is based on the compilation of pre-existing heterogeneous and disparate data sets, in particular when focusing on indices that are very sensitive to sampling design standardization, such as species richness.
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- 2013
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17. Large-Scale Diversity of Slope Fishes: Pattern Inconsistency between Multiple Diversity Indices
- Author
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Gaertner, Jean-Claude, primary, Maiorano, Porza, additional, Mérigot, Bastien, additional, Colloca, Francesco, additional, Politou, Chrissi-Yianna, additional, Gil De Sola, Luis, additional, Bertrand, Jacques A., additional, Murenu, Matteo, additional, Durbec, Jean-Pierre, additional, Kallianiotis, Argyris, additional, and Mannini, Alessandro, additional
- Published
- 2013
- Full Text
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18. Discards of the purse seine fishery targeting small pelagic fish in the eastern Mediterranean Sea
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Tsagarakis, Konstantinos, primary, Vassilopoulou, Vassiliki, additional, Kallianiotis, Argyris, additional, and Machias, Athanassios, additional
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- 2012
- Full Text
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19. Geographical and bathymetric distribution of silver scabbardfish Lepidopus caudatus in North Aegean Sea.
- Author
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Torre, Michele, Kallianiotis, Argyris, Sicuro, Benedetto, and Tsavalou, Vassiliki
- Subjects
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FISHES , *FISHERIES , *INDUSTRIAL surveys , *AQUACULTURE - Abstract
A study on silver scabbardfish (Lepidopus caudatus) distribution and demographic structure was carried out in northern Aegean Sea from bottom trawl surveys (MEDITS: Mediterranean International Bottom Trawl Survey) during1996-2006. The surveys were performed each year (except in 2002) between June and July. Approximately 65 hauls were carried out in total, at depth range between 10 and 800 m. The sampling design adopted was random-stratified including five depth zones: 10-50, 50-100, 100-200, 200-500 and 500-800 m. Data of biomass (kg/km2) and abundance (N/km2) were investigated in order to describe the geographical and bathymetric distribution. Scabbardfish was more frequently found in the area of Lesvos Island between depths of 340 and 370 m. The hotspots of scabbardfish biomass coincided with the longitudinal thermal front that is generated between the eastern (colder) and the western (warmer) surface water masses during the summer months. The aim of this research was to analyze the distribution and demographic structure of L. caudatus and the associated species assemblages in the northern Aegean Sea. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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