Survival and population size of the Indo‐Pacific humpback dolphins off the eastern Leizhou Peninsula

IF 2 3区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Marine Mammal Science Pub Date : 2024-07-06 DOI:10.1111/mms.13156

Wenzhi Lin, Shenglan Chen, Binshuai Liu, Ruiqiang Zheng, Agathe Serres, Mingli Lin, Mingming Liu, Songhai Li

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引用次数: 0

Abstract

Indo‐Pacific humpback dolphins form a resident population off the east coast of Leizhou Peninsula (LZP) in South China. The most recent study suggested ~1,500 individuals in this area, making this population one of only two populations of this species exceeding 1,000 individuals. However, demographic information regarding this population has been lacking since 2012. Using a 5‐year (2019–2023) photo‐identification data set, we examined two key demographic parameters of the LZP population, namely the apparent survival and population size, using multistate capture‐recapture analyses. Annual survival probabilities (φ) changed over time, fluctuating between 0.942 and 0.961 for adults, and between 0.787 and 0.837 for juveniles. Jolly‐Seber multistate model analyses resulted in highly comparable noncalf population size estimates from 2020 to 2023 (2020 = 479, SE = 28; 2021 = 458, SE = 29; 2022 = 481, SE = 27; 2023 = 446, SE = 31). By reviewing the available demographic information, we conclude that the population size of LZP humpback dolphins has been previously overestimated. The time‐dependent survivals seemingly reflect a dynamic development of anthropogenic disturbance during the pandemic period. We propose that the population status should be re‐evaluated, especially in the postpandemic era when the human activities came back to “normal” levels.

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雷州半岛东部海域印度洋中华白海豚的生存状况和种群数量

印度洋-太平洋中华白海豚（Indo-Pacific humpback dolphins）是中国南方雷州半岛东海岸的一个常住种群。最新的研究表明，该区域有约1500只中华白海豚，是该物种仅有的两个超过1000只的种群之一。然而，自 2012 年以来，有关该种群的人口统计信息一直缺失。利用5年（2019-2023年）的照片识别数据集，我们采用多态捕获-再捕获分析方法研究了LZP种群的两个关键人口参数，即表观存活率和种群数量。年存活概率（φ）随时间变化，成体在 0.942 和 0.961 之间波动，幼体在 0.787 和 0.837 之间波动。Jolly-Seber 多态模型分析得出的 2020 年至 2023 年非犊牛种群数量估计值具有高度可比性（2020 年 = 479，SE = 28；2021 年 = 458，SE = 29；2022 年 = 481，SE = 27；2023 年 = 446，SE = 31）。通过回顾现有的人口统计信息，我们得出结论，以前曾高估了LZP中华白海豚的种群数量。与时间相关的存活率似乎反映了大流行期间人为干扰的动态发展。我们建议对种群状况进行重新评估，尤其是在大流行后人类活动恢复到 "正常 "水平的时期。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine Mammal Science 生物-动物学

CiteScore

4.80

自引率

8.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Published for the Society for Marine Mammalogy, Marine Mammal Science is a source of significant new findings on marine mammals resulting from original research on their form and function, evolution, systematics, physiology, biochemistry, behavior, population biology, life history, genetics, ecology and conservation. The journal features both original and review articles, notes, opinions and letters. It serves as a vital resource for anyone studying marine mammals.