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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Revisiting the ontogenetic shift paradigm: The case of juvenile green turtles in the SW Atlantic
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Revisiting the ontogenetic shift paradigm: The case of juvenile green turtles in the SW Atlantic

机译：回顾个体的转变范式：西南大西洋的绿海龟案例

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摘要

The green turtle (Chelonia mydas) is a subcosmopolitan species found in tropical and temperate latitudes. The best knowledge on its behavior described an abrupt and irreversible ontogenetic shift that takes place early in life in some areas such as the Greater Caribbean and Australia. Young turtles move from oceanic to neritic habitats, from pelagic to benthic feeding and from an omnivorous to an herbivorous diet. However, whether this pattern applies elsewhere in the range of the species is not known. In the temperate waters of the South West (SW) Atlantic, preliminary evidence suggests that these juveniles would not comply with the tenets of an abrupt and irreversible ontogenetic shift as in tropical waters. We satellite tracked 9 neritic juveniles moving along the coast of Argentina, and applied a switching state-space model combined with kernel density estimation to identify preferential putative foraging areas and migratory routes. Results indicate that immature green turtles are not strictly herbivores or neritic in the temperate SW Atlantic. In summer and fall, juveniles foraged most of the time in estuarine areas without submerged macrophytes. In winter and spring, the turtles migrated north to warm coastal areas where macroalgae and seagrass are available. Concomitant to pelagic feeding, some turtles reached deep water areas where macrophytes are unlikely to occur. Adaptation to local conditions explains behavior better for the SW Atlantic than the abrupt and irreversible ontogenic shift described for warmer waters.
机译：绿海龟（Chelonia mydas）是在热带和温带地区发现的一种大都会物种。关于其行为的最佳知识描述了生命早期突然发生的不可逆的遗传转变，例如大加勒比海地区和澳大利亚。幼龟从海洋生境转变为海底栖息地，从上层到底栖觅食，从杂食性转变为草食性。但是，这种模式是否适用于该物种范围内的其他位置尚不清楚。初步证据表明，在西南大西洋的温带水域中，这些少年将不像热带水域那样遵循突然的，不可逆转的遗传转变的宗旨。我们通过卫星追踪了沿阿根廷海岸移动的9个轻柔幼体，并应用转换状态空间模型与核密度估计相结合，以识别出假定的优先觅食区和迁徙路线。结果表明，在温带西南大西洋，未成熟的绿海龟不是严格的食草动物或尖齿海龟。在夏季和秋季，河口地区的大多数时间都在觅食，没有淹没的大型植物。在冬季和春季，海龟向北迁移到温暖的沿海地区，那里有大型藻类和海草。伴随中上层饲养，一些乌龟到达了较不可能发生大型植物的深水区域。适应当地条件可以解释南大西洋的行为要比描述为温暖水域的突然且不可逆的个体发生转变更好。

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    Victoria Gonzalez Carman; Valeria Falabella; Sara Maxwell; Diego Albareda; Claudio Campagna; Hermes Mianzan;

  • 作者单位

    Institute National de Investigation y Desarrollo Pesquero (INIDEP), CONICET, Paseo Victoria Ocampo s, 7600, Mar del Plata, Argentina,Aquamarina, PRICTMA, Argentina,Instituto de Investigations Marinas y Costeras (IIMyC), CONICET, Argentina;

    Wildlife Conservation Sotiety, Amenabar 1595, CI426AJZ Ciudad Autonoma de Buenos Aires, Argentina;

    Marine Conservation Institute, 14301 Arnold Dr Ste 25, Glen Ellen, CA 95442, USA,University of California Santa Cruz, Long Marine Laboratory, 100 Shaffer Road, Santa Cruz, CA 95060, USA;

    Aquamarina, PRICTMA, Argentina,Jardin Zoologico de Buenos Aires, Rep. de la India 3000, C1425ATQ Ciudad Autdnoma de Buenos Aires, Argentina;

    CONICET and Wildlife Conservation Sotiety, Amenabar 1595, CI426AJZ Ciudad Autdnoma de Buenos Aires, Argentina;

    Institute National de Investigation y Desarrollo Pesquero (INIDEP), CONICET, Paseo Victoria Ocampo s, 7600, Mar del Plata, Argentina,Instituto de Investigations Marinas y Costeras (IIMyC), CONICET, Argentina;

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  • 关键词

    chelonia mydas; green turtles; habitat use; ontogenetic shift; state-space modeling; SW atlantic;

    机译：chelonia mydas;绿海龟;栖息地利用;本体转变;状态空间建模;南大西洋;

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