Latitudinal cline in the foraging dichotomy of loggerhead sea turtles reveals the importance of East China Sea for priority conservation

Latitudinal cline in the foraging dichotomy of loggerhead sea turtles reveals the importance of East China Sea for priority conservation
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红海龟觅食二分法的纬度变化揭示了东海优先保护的重要性

DOI:
10.1111/ddi.13531
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发表时间:
2022
影响因子:
4.6
通讯作者:
Kameda Kazunari
Kameda Kazunari
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Okuyama Junichi;Watabe Akemi;Takuma Shunichi;Tanaka Kentaro;Shirai Kotaro;Murakami‐Sugihara Naoko;Arita Mamiko;Fujita Kento;Nishizawa Hideaki;Narazaki Tomoko;Yamashita Yoshiya;Kameda Kazunari

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对生境区对养护具有复杂生活史的高度洄游海洋物种的重要性进行量化可能具有挑战性。例如,在日本筑巢的红海龟(Caretta caretta)在繁殖期后在海洋和海洋中觅食。在这里,我们的目的是量化的比例,海龟使用这两个对比的栖息地(觅食二分法),以建议优先保护areas.LocationNorth Pacific Ocean.MethodsWe研究觅食二分法的发生在三个筑巢地点(石垣,冲之寺武群岛和一宫)的基础上稳定同位素分析的蛋黄为82海龟和卫星跟踪后筑巢迁移12海龟。此外,我们使用的数据,其他三个网站从以前的研究(屋久岛,Minabe和御前崎)。ResultsTwo浅海觅食的理由(中国东海和日本列岛的沿海地区),和海洋地面(北太平洋)被确定。我们发现了一个纬度渐变的觅食二分法的发生; >84%的女性筑巢在南部的网站(石垣岛和冲之寺武岛),73%的中间网站(屋久岛和Minabe)和<46%的北方网站(Omaezaki和一宫)是浅海觅食;海洋觅食的比例增加在北方网站。根据日本整个营巢区的年巢数、卫星跟踪和觅食二分法的纬度梯度,我们估计日本一年生营巢雌性的70%和9%分别利用东海和日本列岛沿海的浅海觅食栖息地,和22%利用北太平洋的海洋栖息地。主要conclusionsThe东中国海是一个重要的觅食栖息地的北太平洋种群的濒危红海龟。我们的研究结果强调,需要国际管理,以确保他们的保护。
AimQuantifying the importance of habitat areas for conservation of highly migratory marine species with complex life histories can be challenging. For example loggerhead turtles (Caretta caretta) nesting in Japan forage both oceanically and neritically after their reproductive period. Here, we aimed to quantify the proportions of turtles using these two contrasting habitats (foraging dichotomy) to suggest priority conservation areas.LocationNorth Pacific Ocean.MethodsWe examined the occurrence of foraging dichotomy at three nesting sites (Ishigaki, Okinoerabu Islands and Ichinomiya) based on stable isotope analysis of the egg yolks for 82 turtles and satellite tracking of post‐nesting migration for 12 turtles. Moreover, we used the data of three other sites from previous studies (Yakushima Island, Minabe and Omaezaki).ResultsTwo neritic foraging grounds (East China Sea and the coastal area of the Japanese archipelago), and an oceanic ground (North Pacific Ocean) were identified. We found a latitudinal cline with respect to the occurrence of foraging dichotomy; >84% of the females nesting at southern sites (Ishigaki and Okinoerabu Islands), 73% at middle sites (Yakushima Island and Minabe) and <46% at northern sites (Omaezaki and Ichinomiya) were neritic foragers; the proportion of oceanic foragers increased at northern sites. Based on the annual number of nests in the entire nesting region of Japan, satellite tracking and the latitudinal cline of foraging dichotomy, we estimated that 70% and 9% of annual nesting females in Japan utilize the neritic foraging habitat in the East China Sea and the coastal area of the Japanese archipelago, respectively, and that and 22% utilize the oceanic habitat of the North Pacific Ocean.Main conclusionsThe East China Sea represents a critical foraging habitat for the North Pacific populations of endangered loggerhead sea turtles. Our findings emphasize the need for international management to ensure their protection.
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