Trophically polymorphic loggerhead sea turtles show similar interannual variability in clutch frequencies: implications for estimating population size of iteroparous animals,Journal of Zoology

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Trophically polymorphic loggerhead sea turtles show similar interannual variability in clutch frequencies: implications for estimating population size of iteroparous animals
Journal of Zoology ( IF 1.9 ) Pub Date : 2020-09-04 , DOI: 10.1111/jzo.12830
H. Hatase ₁ , K. Omuta ₂

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We investigated how trophic polymorphism observed at a loggerhead sea turtle (Caretta caretta) rookery affected the interannual variability of clutch frequency (the number of clutches laid by a female during a nesting season) and of the number of total located nests, based on comprehensive nighttime and daytime field surveys conducted at Yakushima Island, Japan, over a non‐consecutive eight‐year period. Taking into account the fact that lower trophic‐level sea turtles show greater variability in these parameters, we anticipated clutch frequency and the number of total located nests to vary more in low trophic‐level oceanic planktivores (secondary consumers) than in high trophic‐level neritic benthivores (tertiary consumers). Oceanic planktivores and neritic benthivores were classified by stable isotope ratios in egg yolks. Neritic foragers had higher clutch frequencies than oceanic foragers in any year. Contrary to our anticipation, however, both types of foragers showed similarly low interannual variability in clutch frequencies. No significant correlations were found between mean clutch frequencies and the estimated number of nests made by either oceanic or neritic foragers and the number of total located nests. Interannual fluctuations in the total number of nests made by loggerhead turtles, whether trophically monomorphic or polymorphic, seem to be driven more by the number of females than by clutch frequency; this suggests that the number of total located nests can be a good proxy for the population size of iteroparous animals at relatively high trophic levels.

中文翻译：

具营养性的多形海龟在离合器频率上表现出相似的年际变化：估计等口动物种群数量的意义

我们调查了在海龟（Caretta caretta）上观察到的营养多态性）根据日本屋久岛非夜间进行的综合夜间和白天实地调查，鸟群影响了离合器频率（在筑巢季节雌性产下的离合器数量）和总巢数的年际变化。连续八年。考虑到低营养级海龟在这些参数中表现出更大的变化性，我们预计低营养级海洋浮游动物（次生消费者）的离合频率和总巢数的变化比高营养级的变化更大。尖锐的底栖动物（三级消费者）。大洋浮游动物和松软底栖动物通过蛋黄中稳定的同位素比率进行分类。在任何一年中，神经性觅食者的离合器频率都比海洋性觅食者高。与我们的预期相反，然而，两种类型的觅食者在离合器频率上的年际变化都相似。没有发现平均离合器频率与大洋或陆性觅食者估计的巢数和总巢数之间有显着相关性。无论是营养上的单态还是多态的，海龟所产巢总数的年际波动似乎更多地是由雌性数量而不是离合频率引起的；这表明总定位巢的数量可以很好地代表营养水平较高的同卵动物的种群大小。在平均离合器频率与大洋觅食或硬毛觅食者的估计巢数和总巢数之间没有发现显着相关性。无论是营养上的单态还是多态的，海龟所产巢总数的年际波动似乎更多地是由雌性数量而不是离合频率引起的；这表明总定位巢的数量可以很好地代表营养水平较高的同卵动物的种群大小。没有发现平均离合器频率与大洋或陆性觅食者估计的巢数和总巢数之间有显着相关性。无论是营养上的单态还是多态的，海龟所产巢总数的年际波动似乎更多地是由雌性数量而不是离合频率引起的；这表明总定位巢的数量可以很好地代表营养水平较高的同卵动物的种群大小。

更新日期：2020-09-04

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