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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海龟筑巢丰度，物候和插栖期的影响

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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：海龟是一种候鸟，每隔几年就会从觅食地迁移到特定的筑巢海滩，因此，可能会受到几种不同生境中海洋条件的影响。我们评估了在嵌套和觅食区域内的海面温度（SST）和叶绿素-（Chl-）如何影响在哥斯达黎加西北部Cabuyal筑巢的绿海龟（Chelonia mydas）的筑巢丰度，物候和筑巢期的持续时间。具体来说，我们将（1）觅食区的SST和Chl-与七个嵌套季节在海滩上记录的嵌套丰度和中位筑巢日期（MND）进行了比较，以及（2）将相互交错的生境中的SST与观察到的嵌套期（OIP）（成功嵌套事件之间的天数）和MND。在筑巢季节之前的二月，筑巢丰度与主要觅食区的Chl-浓度高度相关。但是，我们发现SST或Chl-在MND觅食或交错栖息地中均无显着影响。相互交错的生境和OIP中的平均SST值呈负相关，并且在数年之间和数年之内变化很大。海洋学条件似乎对OIP和筑巢数量有很大影响，但对这一地区的绿海龟的筑巢物候没有影响。海洋条件对东太平洋绿海龟繁殖的影响具有复杂性，这表明该物种如何应对气候变化尚不确定。

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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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