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Ontogenetic dietary changes of green turtles (Chelonia mydas) in the temperate southwestern Atlantic

机译：温带西南大西洋绿海龟（Chelonia mydas）的个体发育饮食变化

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摘要

The present study combines esophageal lavage (n = 74), stomach content (n = 52) and stable isotope analysis (n = 126) to understand the ontogenetic dietary shift of green turtles (Chelonia mydas) inhabiting the temperate waters off Uruguay. Based on esophageal and stomach analysis, green turtles in the region start consuming macroalgae soon after recruiting to neritic habitats; however, gelatinous macrozooplankton is still a major component of the diet of neritic juvenile green turtles measuring of less than 45 cm in curved carapace length (CCL). Conversely, turtles larger than 45 cm CCL were predominantly herbivores, with a gradual increase in the occurrence of macroalgae with size. Stable isotope analysis confirmed the dietary pattern revealed by esophageal lavage and stomach contents analysis, and also revealed that most of the green turtles smaller than 50 cm CCL found in Uruguayan waters had moved from Brazil only a few months ago. This conclusion is based on the large differences in the delta N-15 values of potential prey from southern Brazil and Uruguay and on a strong signal from Brazilian macrophytes in the skin of most green turtles from Uruguay. Turtles larger than 50 cm CCL, conversely, made a more prolonged use of Uruguayan foraging grounds. Furthermore, according to the stable isotope ratios in their skin, some turtles remained year round in Uruguayan coastal waters. The overall evidence indicates that green turtles inhabiting the coastal waters off Uruguay exhibit a rapid, but not abrupt, dietary shift after recruiting to neritic habitats and are best described as omnivores than as pure herbivores, with a relevant role of gelatinous macrozooplankton in their diets. Furthermore, most of the turtles spend only short periods in the area and their primary foraging grounds are in Brazil.
机译：本研究结合了食道灌洗（n = 74），胃内容物（n = 52）和稳定同位素分析（n = 126）来了解居住在乌拉圭附近温带水域的绿海龟（Chelonia mydas）的自体饮食转变。根据食道和胃的分析，该地区的绿海龟在被征召到栖息地后不久就开始食用巨藻。然而，胶状大型浮游动物仍然是弯曲背甲长度（CCL）小于45厘米的幼年幼绿海龟日粮的主要成分。相反，CCL大于45 cm的海龟主要是草食性的，随着尺寸的增加，大型藻类的发生也逐渐增加。稳定的同位素分析证实了通过食道灌洗和胃内容物分析揭示的饮食模式，并且还揭示了在乌拉圭水域中发现的小于50厘米覆铜板的大多数绿海龟仅在几个月前才从巴西迁出。该结论基于巴西南部和乌拉圭的潜在猎物的N-15值差异较大，以及乌拉圭大多数绿海龟的皮肤中巴西大型植物的强烈信号。相反，大于50厘米CCL的海龟更多地使用了乌拉圭觅食场。此外，根据其皮肤中稳定的同位素比率，乌龟在乌拉圭沿海水域全年终生留存。总体证据表明，居住在乌拉圭沿海水域的绿海龟在被征召进入栖息地后，其饮食结构发生了快速但不突变的变化，与纯草食动物相比，其被描述为杂食动物，在其饮食中具有胶质大浮游动物的相关作用。此外，大多数海龟仅在该地区度过短时，它们的主要觅食地在巴西。

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    《Marine biology》 |2016年第3期|57.1-57.16|共16页
  • 作者

    Velez-Rubio G. M.; Cardona L.; Lopez-Mendilaharsu M.; Martinez Souza G.; Carranza A.; Gonzalez-Paredes D.; Tomas J.;

  • 作者单位

    Karumbe NGO, Av Rivera 3245, Montevideo 11600, Uruguay|Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol ICB, Marine Zool Unit, Aptdo 22085, E-46071 Valencia, Spain|Univ Republ, Ctr Univ Reg Este, Grp Invest & Formac Recursos Humanos Biodiversida, Campus Maldonado, Punta Del Este 20100, Uruguay;

    Univ Barcelona, Fac Biol, Biodivers Res Inst IRBio, E-08028 Barcelona, Spain|Univ Barcelona, Fac Biol, Dept Anim Biol, E-08028 Barcelona, Spain;

    Karumbe NGO, Av Rivera 3245, Montevideo 11600, Uruguay|Fundacao Pro TAMAR, BR-2219 Salvador, BA, Brazil;

    Karumbe NGO, Av Rivera 3245, Montevideo 11600, Uruguay|Univ Fed Rio Grande, Inst Ciencias Biol, Campus Carreiros Av Italia,Km 8, BR-96203900 Rio Grande, RS, Brazil;

    Univ Republ, Ctr Univ Reg Este, Grp Invest & Formac Recursos Humanos Biodiversida, Campus Maldonado, Punta Del Este 20100, Uruguay|Museo Nacl Hist Nat, Area Biodiversidad & Conservac, CC 399, Montevideo 11000, Uruguay;

    Karumbe NGO, Av Rivera 3245, Montevideo 11600, Uruguay|Hombre & Terr Assoc, C Betania 13, Seville 41007, Spain;

    Univ Valencia, Cavanilles Inst Biodivers & Evolutionary Biol ICB, Marine Zool Unit, Aptdo 22085, E-46071 Valencia, Spain;

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