Using data from nesting beach monitoring and satellite telemetry to improve estimates of marine turtle clutch frequency and population abundance

Using data from nesting beach monitoring and satellite telemetry to improve estimates of marine turtle clutch frequency and population abundance
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利用筑巢海滩监测和卫星遥测数据来改进对海龟产卵频率和种群丰度的估计

DOI:
10.1007/s00227-021-03983-z
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发表时间:
2021
期刊:
影响因子:
2.4
通讯作者:
Fuentes, M. M.
Fuentes, M. M.
中科院分区:
生物学2区
文献类型:
--
作者:
Santos, A.J.B.;Vieira, D.H.G.;Bellini, C.;Corso, G.;Ceriani, S.;Fuentes, M. M.

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种群丰度数据通常用于定义物种的保护状况。海龟的数量通常是使用筑巢海滩监测数据来估计的,例如巢数和产蛋频率(CF,即雌性海龟在筑巢季节内产卵的巢数)。然而,研究表明,仅根据筑巢海滩监测数据确定的 CF 可能会被低估,从而导致丰度估计不准确。为了获得南大西洋筑巢密度最高的巴西东北部(南纬 6.273356°,西经 35.036271°)玳瑁海龟 CF 的可靠估计,结合了 2014 年至 2019 年海滩监测和卫星遥测数据。海滩监测数据表明了第一次筑巢事件的日期,而卫星遥测数据的状态空间模型表明了海龟的离开日期,从而可以计算繁殖时的停留时间基于嵌套间隔的地点和 CF 估计。据估计,雌性在筑巢季节最多筑巢六次,CF 估计每只雌性产卵 4.5 至 4.8 窝。 CF 估计用于根据两种方法确定研究地点筑巢雌性的数量:考虑和不考虑临时海龟。我们的方法和研究结果强调,瞬变严重影响 CF 估计,需要重新考虑如何通常确定海龟种群的这一关键参数,以及使用海滩监测数据和卫星遥测来估计 CF。
Population abundance data are often used to define species’ conservation status. Abundance of marine turtles is typically estimated using nesting beach monitoring data such as nest counts and clutch frequency (CF, i.e., the number of nests female turtles lay within a nesting season). However, studies have shown that CF determined solely from nesting beach monitoring data can be underestimated, leading to inaccurate abundance estimates. To obtain reliable estimates of CF for hawksbill turtles in northeastern Brazil (6.273356° S, 35.036271° W), the region with the highest nesting density in the South Atlantic, data from beach monitoring and satellite telemetry were combined from 2014 to 2019. Beach monitoring data indicated the date of first nesting event, while state-space modeling of satellite telemetry data indicated the departure date of turtles, allowing calculations of residence length at breeding site and CF estimates based on internesting intervals. Females were estimated to nest up to six times within the nesting season with CF estimates between 4.5 and 4.8 clutches per female. CF estimates were used to determine the number of nesting females at the study site based in two approaches: considering and not considering transient turtles. Our approach and findings highlight that transients heavily influence CF estimates and need for reconsideration of how this key parameter is commonly determined for marine turtle populations and the use of beach monitoring data and satellite telemetry for estimations of CF.
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