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Environmental and anthropogenic factors affecting nesting site selection by sea turtles.
Marine Environmental Research ( IF 3.3 ) Pub Date : 2020-08-06 , DOI: 10.1016/j.marenvres.2020.105090
Inaiara Sousa Siqueira-Silva 1 , Maurício Oliveira Arantes 2 , Carlos Werner Hackradt 1 , Alexandre Schiavetti 3
Affiliation  

Understanding the environmental and anthropogenic factors that affect nesting site selection by sea turtles is key to maintaining priority conservation areas. The species Lepidochelys olivacea, Caretta caretta, and Eretmochelys imbricata nest annually on the island of Comandatuba (Una, northeastern Brazil), where this survey was conducted. We evaluated the temporal and spatial distribution of nests during the seasons 2008/2009 to 2014/2015 and 2017/2018. In the last season, we further examined the environmental and anthropogenic factors that influence different nesting performances. We selected six sample areas with different nesting events (high, medium, and low), and recorded the following characteristics: beach slope, sediment grain size, vegetation richness, type of dune, anthropization, and final nest condition. A significant occurrence of nesting was observed in November and December . The spatial distribution of the nests varied over the seasons, with a greater tendency to nest in the south of the island. Higher frequency of anthropization and low slope of the beach were significant factors for areas with a smaller number of nests. Predation of turtle nests may be associated with areas of greater anthropization. Our findings have implications for the conservation and monitoring of nesting sites during reproduction seasons and provide further insight into the nesting dynamics of marginal sea turtle populations.



中文翻译:

环境和人为因素影响海龟筑巢地点的选择。

了解影响海龟筑巢地点选择的环境和人为因素是维持优先保护区的关键。物种Lepidochelys olivaceaCaretta carettaEretmochelys imbricata每年在进行此项调查的Comandatuba岛(巴西东北部的乌纳)上筑巢。我们评估了2008/2009年至2014/2015年和2017/2018年季节巢的时空分布。在上一个季节,我们进一步检查了影响不同筑巢性能的环境和人为因素。我们选择了六个具有不同筑巢事件(高,中和低)的样本区域,并记录了以下特征:海滩坡度,沉积物粒度,植被丰富度,沙丘类型,人类化和最终筑巢条件。在11月和12月观察到大量的筑巢。巢的空间分布随季节而变化,更倾向于在岛的南部筑巢。对于巢数较少的地区,较高的人类活动频率和较低的海滩坡度是重要因素。龟巢的捕食可能与人类活动较多的地区有关。我们的发现对繁殖季节的筑巢地点的保护和监测具有重要意义,并为边际海龟种群的筑巢动态提供了进一步的见识。

更新日期:2020-08-21
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