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首页> 外文期刊>Marine biology >Foraging ecology of Mediterranean juvenile loggerhead turtles: insights from C and N stable isotope ratios
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Foraging ecology of Mediterranean juvenile loggerhead turtles: insights from C and N stable isotope ratios

机译：地中海少年的觅食生态：C和N稳定同位素比的见解

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摘要

Bycatch is one of the key threats to juvenile marine turtles in the Mediterranean Sea. As fishing methods are regional or habitat specific, the susceptibility of marine turtles may differ according to inter- and intra-population variations in foraging ecology. An understanding of these variations is necessary to assess bycatch susceptibility and to implement region-specific management. To determine if foraging ecology differs with region, sex, and size of juvenile loggerhead turtles (Caretta caretta), stable isotope analysis of carbon and nitrogen was performed on 171 juveniles from a range of foraging regions across the central and eastern Mediterranean Sea. Isotope ratios differed with geographical region, likely due to baseline variations in delta C-13 and delta N-15 values. The absence of sex-specific differences suggests that within an area, all comparably sized animals likely exploit similar foraging strategies, and therefore, their susceptibility to fisheries threats will likely be similar. The isotope ratios of juveniles occupying the North East Adriatic and North Levantine basin increased with size, potentially due to increased consumption of more prey items at higher trophic levels from a more neritic source. Isotope ratios of juveniles with access to both neritic and oceanic habitats did not differ with size which is consistent with them consuming prey items from both habitats interchangeably. With foraging habitats exploited differently among size classes in a population, the susceptibility to fisheries interactions will likely differ with size; therefore, region-specific management approaches will be needed.
机译：兼捕是地中海少年海龟的主要威胁之一。由于捕捞方法是区域性或栖息地特定的，因此海龟的敏感性可能因觅食生态系统中种群间和种群内的变化而有所不同。对这些变化的理解对于评估兼捕物的敏感性和实施针对特定区域的管理是必要的。为了确定觅食生态是否随区域性sex（Caretta caretta）的大小，性别和大小而变化，对地中海中部和东部海域各种觅食区域的171个幼鱼进行了碳和氮的稳定同位素分析。同位素比率随地理区域而异，这可能是由于C-13和N-15值的基线变化所致。由于没有性别差异，因此在一个区域内，所有同等大小的动物都可能采用类似的觅食策略，因此，它们对渔业威胁的敏感性也可能相似。东北亚得里亚海盆地和北黎凡特盆地的未成年人的同位素比率随着大小的增加而增加，这可能是由于来自更高的营养来源的更高营养级别的更多猎物的消费增加了。可以进入近海和海洋生境的未成年人的同位素比率在大小上没有差异，这与它们可互换地消耗来自两个生境的猎物是一致的。由于觅食生境在种群规模规模之间的开发方式不同，对渔业相互作用的敏感性可能会因规模而异。因此，将需要针对特定​​区域的管理方法。

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  • 来源
    《Marine biology》 |2020年第3期|28.1-28.15|共15页
  • 作者

    Haywood Julia C.; Casale Paolo; Freggi Daniela; Fuller Wayne J.; Godley Brendan J.; Lazar Bojan; Margaritoulis Dimitris; Rees ALan F.; Shutler Jamie D.; Snape Robin T.; Swain-Diaz Nathalie R.; Widdicombe Stephen; Broderick Annette C.;

  • 作者单位

    Univ Exeter Marine Turtle Res Grp Ctr Ecol & Conservat Penryn Campus Penryn TR10 9FE Cornwall England|Plymouth Marine Lab Prospect Pl Plymouth PL1 3DH Devon England;

    Univ Pisa Dept Biol Via A Volta 6 I-56126 Pisa Italy;

    Sea Turtle Rescue Ctr I-92010 Lampedusa Italy;

    Near East Univ Fac Vet Med Mersin 10 Nicosia North Cyprus Turkey;

    Univ Exeter Marine Turtle Res Grp Ctr Ecol & Conservat Penryn Campus Penryn TR10 9FE Cornwall England|Univ Exeter Environm & Sustainabil Inst Penryn Campus Penryn TR10 9FE Cornwall England;

    Univ Primorska Fac Math Nat Sci & Informat Technol Dept Biodivers Glagoljaiska 8 Koper 6000 Slovenia|Juraj Dobrila Univ Pula Marine Sci Program Zagrebacka 30 Pula 52100 Croatia;

    ARCHELON Solomou 57 Athens 10432 Greece;

    Univ Exeter Marine Turtle Res Grp Ctr Ecol & Conservat Penryn Campus Penryn TR10 9FE Cornwall England|ARCHELON Solomou 57 Athens 10432 Greece;

    Univ Exeter Ctr Geog & Environm Sci Penryn Campus Penryn TR10 9FE Cornwall England;

    Univ Exeter Marine Turtle Res Grp Ctr Ecol & Conservat Penryn Campus Penryn TR10 9FE Cornwall England|Soc Protect Turtles Kyrenia North Cyprus Turkey;

    Univ Exeter Marine Turtle Res Grp Ctr Ecol & Conservat Penryn Campus Penryn TR10 9FE Cornwall England;

    Plymouth Marine Lab Prospect Pl Plymouth PL1 3DH Devon England;

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