Use of diet and body condition assessments as intermediate indicators of translocation success in the Critically Endangered Philippine crocodile ( Crocodylus mindorensis )
Use of diet and body condition assessments as intermediate indicators of translocation success in the Critically Endangered Philippine crocodile ( Crocodylus mindorensis )
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DOI：
10.1002/aqc.3700
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
Joseph C. Brown;M. Shirley;Amante Yog‐yog;M. Weerd;Marites G. Balbas;B. A. Tarun;Cameron D. Siler
中科院分区：
文献类型：
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作者：
Joseph C. Brown;M. Shirley;Amante Yog‐yog;M. Weerd;Marites G. Balbas;B. A. Tarun;Cameron D. Siler
迁移成功的中间指标对于寿命长、成熟缓慢的物种非常有用，这些物种的生存和繁殖需要几十年的时间。极度濒危的菲律宾鳄鱼（Crocodylus mindorensis）是地球上最受威胁的物种之一，野生数量不到150只。这项研究首次分析了野生菲律宾鳄鱼和在过去十年中释放到野外的头启动（即圈养）个体的饮食和身体状况，并使用这些结果来显示饮食和身体状况如何成为易位成功的相关中间指标。胃内容物分析显示了17种不同的水生和陆生无脊椎动物和脊椎动物猎物物种。有趣的是，70%的菲律宾鳄鱼显示蜗牛是主要的猎物类型，其次是鱼类（36.7%），鸟类（33.3%）和爬行动物（33.3%）。超过50%的鳄鱼食用入侵的金苹果蜗牛，这是一种主要的农业害虫。不管鳄鱼的历史（狂野与领先）或大小类（青少年与成年人），没有证据表明饮食差异的发生率，百分比组成或猎物的多样性。身体状况显着较高，在野生相比，头开始的个人一起分析时，在一个汇总组，虽然没有组显着不同的标准化的期望，这项研究提供了一个工作的例子，如何评估迁移和野生个体之间的饮食和身体状况的趋同性，可以提供补充的监测参数，以证明释放后的建立鳄鱼的易位。在这项研究中观察到的一致的饮食组成和可比的身体状况表明，headstarted鳄鱼适应以及以下release.Crocodylus mindorensissurvives在农业景观，很可能发挥重要的生态作用，通过利用入侵物种，加强该物种对当地社区的重要性。
Intermediate metrics of translocation success are useful for long‐lived, slow to mature species where survival and reproduction happen over decades.With fewer than 150 individuals in the wild, the Critically Endangered Philippine crocodile (Crocodylus mindorensis) is one of the most threatened species on Earth. This study presents the first analysis of diet and body condition of wild Philippine crocodiles and headstarted (i.e. captive‐reared) individuals released into the wild over the last decade, and uses these results to show how diet and body condition can be pertinent intermediate metrics of translocation success.Analyses of stomach contents revealed 17 different aquatic and terrestrial invertebrate and vertebrate prey species. Interestingly, 70% of Philippine crocodiles showed snails to be the predominent prey type, followed by fish (36.7%), birds (33.3%) and reptiles (33.3%). More than 50% of crocodiles consumed the invasive golden apple snail, a leading agricultural pest. Regardless of crocodile history (wild vs. headstarted) or size class (juvenile vs. adult), no evidence was found for dietary differences in percentage occurrence, percentage composition or prey diversity.Body condition was significantly higher in wild compared with headstarted individuals when analysed together in a pooled group, although neither group differed significantly from the standardized expectation, and headstarted individuals were not significantly different when body condition was derived independently for the two groups.This study provides a working example of how assessing the convergence of diet and body condition between translocated and wild individuals can provide complementary monitoring parameters to demonstrate post‐release establishment of translocated crocodylians. The congruent dietary composition and comparable body condition observed in this study suggest that headstarted crocodiles adapt well following release.Crocodylus mindorensissurvives in an agricultural landscape and is likely to play an ecologically important role by exploiting invasive species, reinforcing the importance of this species to local communities.