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Satellite tracking reveals nesting patterns, site fidelity, and potential impacts of warming on major rookeries of green turtles in the Red Sea
Frontiers in Marine Science ( IF 3.7 ) Pub Date : 2021-04-30 , DOI: 10.3389/fmars.2021.633814
Takahiro Shimada , Carlos M. Duarte , Abdulaziz M. Al-Suwailem , Lyndsey K. Tanabe , Mark G. Meekan

Major aggregations of nesting green turtles (Chelonia mydas) occur in the central Red Sea, although little is known about the reproductive ecology of this endangered species in the region. To address this issue, we satellite-tracked 30 female green turtles to document their movements and to identify factors driving habitat use at two major rookeries in the Red Sea, Jazirat Mashabah (Mashabah Island) and Ras Al Baridi in Saudi Arabia. Between successive nesting events, turtles displayed high fidelity to nesting beaches and adjacent in-water habitats (inter-nesting habitats). Using generalised linear mixed models, we estimated the mean probability of nesting per beach emergence (nesting success rate) to be 0.628, and the mean duration between a successful nesting event and the successive emergence onto the beach (re-nesting interval) to be 10.8 days at each site. The nesting success rate was relatively high (>0.8) when the preceding daytime land surface temperature (LST) was lower than 37ºC but decreased with elevated daytime LST (47°C). Re-nesting interval was longer at lower water temperatures and towards the end of the nesting season of individuals. Our study improves the robustness of abundance estimates from census data (e.g. track counts) and shows that the protection of nesting and inter-nesting habitats during a breeding season would be an effective conservation strategy for the species. We discuss that global warming could increase energy expenditure due to lowered nesting success, ultimately compromising the reproductive fitness of these populations.

中文翻译:

卫星跟踪揭示了筑巢模式,地点保真度以及变暖对红海绿海龟主要群的潜在影响

巢绿海龟(Chelonia mydas)主要聚集在红海中部,尽管对该地区该濒危物种的繁殖生态知之甚少。为了解决这个问题,我们对30只雌性绿海龟进行了卫星追踪,以记录它们的活动并确定在红海的两个主要鸟类群落Mazibah(马沙巴岛)和沙特阿拉伯的Ras Al Baridi栖息地使用的驱动因素。在连续的筑巢事件之间,海龟对筑巢的海滩和相邻的水生生境(相互嵌套的生境)表现出很高的保真度。使用广义线性混合模型,我们估计每个海滩出现嵌套的平均概率(嵌套成功率)为0.628,成功嵌套事件与海滩上连续出现之间的平均持续时间(重新嵌套间隔)为10 。每个站点8天。当前一天的地表温度(LST)低于37ºC时,筑巢成功率相对较高(> 0.8),但随着日间LST(47°C)的升高,筑巢成功率降低。在较低的水温下和个体筑巢季节即将结束时,重新筑巢的间隔较长。我们的研究提高了人口普查数据(例如,轨道数)估算值的稳健性,并表明在繁殖季节保护嵌套和相互嵌套的栖息地将是该物种的有效保护策略。我们讨论,由于筑巢成功率降低,全球变暖可能会增加能源消耗,最终损害这些种群的生殖健康。8)当前一天的地面温度(LST)低于37ºC,但随着白天的LST(47°C)升高而下降。在较低的水温下和个体筑巢季节即将结束时,重新筑巢的间隔较长。我们的研究提高了人口普查数据(例如,轨道数)估算值的稳健性,并表明在繁殖季节保护嵌套和相互嵌套的栖息地将是该物种的有效保护策略。我们讨论,由于筑巢成功率降低,全球变暖可能会增加能源消耗,最终损害这些种群的生殖健康。8)当前一天的陆地表面温度(LST)低于37ºC,但随着白天的LST(47°C)升高而降低。在较低的水温下和个体筑巢季节即将结束时,重新筑巢的间隔较长。我们的研究提高了人口普查数据(例如足迹数)中丰度估计值的稳健性,并表明在繁殖季节保护嵌套和相互嵌套的栖息地将是该物种的有效保护策略。我们讨论,由于筑巢成功率降低,全球变暖可能会增加能源消耗,最终损害这些种群的生殖健康。我们的研究提高了人口普查数据(例如,轨道数)估算值的稳健性,并表明在繁殖季节保护嵌套和相互嵌套的栖息地将是该物种的有效保护策略。我们讨论,由于筑巢成功率降低,全球变暖可能会增加能源消耗,最终损害这些种群的生殖健康。我们的研究提高了人口普查数据(例如,轨道数)估算值的稳健性,并表明在繁殖季节保护嵌套和相互嵌套的栖息地将是该物种的有效保护策略。我们讨论,由于筑巢成功率降低,全球变暖可能会增加能源消耗,最终损害这些种群的生殖健康。
更新日期:2021-05-02
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