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首页> 外文期刊>Marine biology >Stable isotopes and epibiont communities reveal foraging habitats of nesting loggerhead turtles in the South West Indian Ocean
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Stable isotopes and epibiont communities reveal foraging habitats of nesting loggerhead turtles in the South West Indian Ocean

机译：稳定的同位素和遗产社区揭示了嵌套灌木丛中西南印度洋的栖息地栖息地

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Loggerhead sea turtles (Caretta caretta) occupy an array of marine habitats throughout their lives and understanding how this threatened species utilizes these habitats can help guide conservation efforts. This study used a combination of isotopic analysis (delta C-13; delta N-15) of turtle epidermis and epibiotic community composition to examine habitat-use patterns of nesting loggerheads from the South West Indian Ocean and related these to turtle body condition. First, we identified two foraging groups using relative changes in the turtle's epidermis delta C-13 isotope values (of 170 individuals). Second, we show that epibiont communities (of 80 turtles) differed significantly between the two foraging groups, with oceanic/pelagic and neritic/benthic species occurring in higher abundances on turtles with depleted and enriched delta C-13 values, respectively. The complementary evidence from isotope and epibiont data thus indicates that nesting loggerheads of this population exhibit a bimodal foraging strategy. The relatively high variability in delta C-13 and delta N-15 values of the turtles' tissue showed that they have a broad isotopic niche. While isotopic niches overlapped among turtles with different body conditions, very healthy individuals had a significantly narrower isotopic niche width than those in poorer condition. This suggests that turtles in very good condition are food specialists, and individuals with suboptimal body conditions utilise a wider range of food items and are more generalist foragers. These results show the value of using a combination of stable isotopes and epibiont communities as cost-effective tools that can be applied effectively to derive information on habitat-use patterns of migratory species.
机译：Loggerhead海龟（Caretta Caretta）在整个生活中占据了一系列海洋栖息地，并了解这种受威胁的物种利用这些栖息地可以帮助指导保护努力。本研究使用了同位素分析（Delta C-13; Delta N-15）的龟表皮和癫痫群落组合物的组合，以检查从西南印度洋筑巢的栖息地栖息地的栖息地模式，并将这些栖息于龟体状况。首先，我们使用龟的表皮ΔC-13同位素值（170个个体）的相对变化来确定两个觅食组。其次，我们表明，两种觅食组之间的盲杉社区（80只海龟）分别在两只觅食组之间有显着不同，海洋/胸腺和无毒/底栖物种分别发生在羽毛的乌龟和富集的Delta C-13值的乌龟的较高丰度。因此，来自同位素和遗传数据的互补证据表明该人群的嵌套令人展示了双峰觅食策略。迄今为止的龟组组织的ΔC-13和δn-15值的相对高的变化显示它们具有宽的同位素的乳蛋白。虽然同位素的位于与不同的身体条件不同的海龟中，但非常健康的个体具有明显较窄的同位素利基宽度，而不是较差的情况。这表明龟在非常好的条件下是食品专家，并且具有次优的身体状况的个人利用更广泛的食品，更通用的觅食者。这些结果显示使用稳定同位素和遗产社区的组合作为具有成本效益的工具的价值，可以有效应用，以获得有关迁徙物种的栖息地模式的信息。

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  • 来源
    《Marine biology》 |2020年第11期|162.1-162.12|共12页
  • 作者

    Nolte C. R.; Pfaff M. C.; de Lecea A. M.; le Gouvello D.; Nel R.;

  • 作者单位

    Nelson Mandela Univ Inst Coastal & Marine Res Summerstrand South Campus Port Elizabeth South Africa|Nelson Mandela Univ Dept Zool Summerstrand South Campus Port Elizabeth South Africa;

    Dept Environm Fisheries & Forestry Oceans & Coast Cape Town South Africa|Univ Cape Town Dept Biol Sci Cape Town South Africa;

    South Atlantic Environm Res Inst Stanley Falkland Island|Univ South Africa Dept Environm Sci Coll Agr & Environm Sci Pretoria South Africa;

    Nelson Mandela Univ Inst Coastal & Marine Res Summerstrand South Campus Port Elizabeth South Africa|Nelson Mandela Univ Dept Zool Summerstrand South Campus Port Elizabeth South Africa;

    Nelson Mandela Univ Inst Coastal & Marine Res Summerstrand South Campus Port Elizabeth South Africa|Nelson Mandela Univ Dept Zool Summerstrand South Campus Port Elizabeth South Africa;

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