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Influence of oceanographic conditions on nesting abundance, phenology and internesting periods of east Pacific green turtles

机译：海洋条件对东太平洋绿色乌龟筑巢，吩骨质和临界阶段的影响

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摘要

Sea turtles are migratory animals that travel from foraging grounds to specific nesting beaches every few years and that, therefore, can be influenced by oceanographic conditions in several different habitats. We assessed how sea surface temperature (SST) and chlorophyll- (Chl-) within both internesting and foraging areas influence the nesting abundance, phenology and duration of internesting periods of the green turtles (Chelonia mydas) that nest at Cabuyal, Northwest Costa Rica. Specifically, we compared (1) SST and Chl- in foraging areas to the nesting abundance and median nesting date (MND) registered on the beach over seven nesting seasons and (2) SST in internesting habitats to the observed internesting period (OIP) (number of days between successful nesting events) and the MND. Nesting abundance was strongly correlated to Chl- concentrations at the main foraging area during the February preceding the nesting season. However, we found no significant effect of SST or Chl- in either foraging or internesting habitats on the MND. Mean SST values in the internesting habitats and OIP were negatively correlated and were highly variable both between and within years. Oceanographic conditions appear to strongly influence OIP and nesting abundance, but not the nesting phenology of green turtles in this area. The complex nature of the effect of oceanographic conditions on reproduction of the East Pacific green turtle suggests uncertainty in how this species will respond to climate change.
机译：海龟是迁徙的动物，每隔几年从觅食地到特定的筑巢海滩，因此可能会受到几种不同栖息地的海洋环境的影响。我们评估了海面温度（SST）和叶绿素 - （CHL-）在间面和觅食区域中如何影响绿龟（Chelonia Mydas）的筑巢丰富，婴儿和持续时间，这些乌龟（Chelonia Mydas）在Cabuyal，西北哥斯达黎加筑巢。具体而言，我们将（1）SST和CHL-在嵌套丰富和中位数嵌套日（MND）的居住地区进行比较，在海滩上注册超过七个嵌套季节和（2）SST，以观察到的拘留期（OIP）（成功嵌套事件之间的天数）和MND。在筑巢季节之前，嵌套丰富与主要觅食区的CHL集中浓度强烈相关。然而，我们发现SST或CHL-在MND上的觅食或拘留栖息地没有显着影响。在临时栖息地和OIP中的平均值是否定相关的，并且在几年内和几年之间具有高度变化。海洋学条件似乎强烈影响OIP和筑巢丰富，但不是该地区绿色海龟的嵌套候选。海洋环境对东太平洋绿龟繁殖的影响的复杂性表明，该物种如何应对气候变化的情况表明了不确定性。

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  • 来源
    《Marine biology》 |2019年第7期|93.1-93.11|共11页
  • 作者

    Valverde-Cantillo Veronica; Robinson Nathan J.; Santidrian Tomillo Pilar;

  • 作者单位

    Univ Nacl Escuela Ciencias Biol Heredia Costa Rica|Leatherback Trust Goldring Gund Marine Biol Stn Playa Grande Costa Rica;

    Cape Eleuthera Isl Sch Cape Eleuthera Inst Eleuthera Bahamas;

    Leatherback Trust Goldring Gund Marine Biol Stn Playa Grande Costa Rica;

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