生物多样性 ›› 2025, Vol. 33 ›› Issue (4): 24145. DOI: 10.17520/biods.2024145 cstr: 32101.14.biods.2024145
• 战略生物资源专题 • 下一篇
易木荣1,2,#, 卢萍3,#(), 彭勇4, 汤勇4, 许久恒4, 尹浩萍1,2(
), 张路杨5, 翁晓东3(
), 底明晓3, 雷隽6(
), 卢宸祺1,2(
), 曹如君1,2, 戴年华3, 占德洋4, 童媚4, 楼智明4, 丁永刚4, 柴静1,*(
)(
), 车静1,*(
)(
)
收稿日期:
2024-04-15
接受日期:
2024-07-18
出版日期:
2025-04-20
发布日期:
2024-09-18
通讯作者:
*E-mail: chej@mail.kiz.ac.cn;
chaijing@mail.kiz.ac.cn
作者简介:
#共同第一作者
基金资助:
Yi Murong1,2,#, Lu Ping3,#(), Peng Yong4, Tang Yong4, Xu Jiuheng4, Yin Haoping1,2(
), Zhang Luyang5, Weng Xiaodong3(
), Di Mingxiao3, Lei Juan6(
), Lu Chenqi1,2(
), Cao Rujun1,2, Dai Nianhua3, Zhan Deyang4, Tong Mei4, Lou Zhiming4, Ding Yonggang4, Chai Jing1,*(
)(
), Che Jing1,*(
)(
)
Received:
2024-04-15
Accepted:
2024-07-18
Online:
2025-04-20
Published:
2024-09-18
Contact:
*E-mail: chej@mail.kiz.ac.cn;
chaijing@mail.kiz.ac.cn
About author:
#Co-first authors
Supported by:
摘要:
濒危物种的有效保护依赖于基础调查研究和评估数据, 并依此制定相应的保护行动计划。受栖息地破坏和人类过度捕捞影响, 大鲵(Andrias spp.)野外种群稀少, 同时由于基础研究数据缺乏, 濒危程度的评估失去了科学基础。本研究于2021-2023年连续3年在江西靖安县北潦河金家水支流开展江西大鲵(A. jiangxiensis)野外种群的标志重捕调查与监测。累计目击成体、亚成体628尾次, 其中带标记个体543尾次, 至少重捕一次个体230尾次。综合分析结果显示: 经标志重捕Schnabel模型估算, 该种群大小为474尾(95% CI: 427-534), 种群密度为79尾/km (95% CI: 71-89)和1.31尾/100 m2 (95% CI: 1.19-1.48)。种群结构分析显示, 体长大于70 cm或小于30 cm个体的数量极少。同时调查中多次目击到幼鲵、亚成体被天敌或同类残食; 连续3年在9月或10月发现其野外繁殖场, 1-3月累计目击记录新孵化幼鲵738尾次, 4-12月全河段再次目击幼鲵的频率则极低(0.38尾·人-1·h-1)。此外, 栖息地评估提示江西大鲵面临较大的生存威胁: 下游水坝的存在导致目前物种野外种群呈现隔离状态, 有限的栖息地(3.6 ha)内环境波动剧烈, 春夏丰水季洪水泛滥、自然坡岸塌方, 秋冬枯水季河道干涸, 断流频发。综上, 本研究建议将江西大鲵的濒危等级评估为极危(CR), 野外种群列为国家一级重点保护野生动物, 亟待实施相应保护措施。
易木荣, 卢萍, 彭勇, 汤勇, 许久恒, 尹浩萍, 张路杨, 翁晓东, 底明晓, 雷隽, 卢宸祺, 曹如君, 戴年华, 占德洋, 童媚, 楼智明, 丁永刚, 柴静, 车静 (2025) 北潦河金家水支流江西大鲵野外种群现状及栖息地评估. 生物多样性, 33, 24145. DOI: 10.17520/biods.2024145.
Yi Murong, Lu Ping, Peng Yong, Tang Yong, Xu Jiuheng, Yin Haoping, Zhang Luyang, Weng Xiaodong, Di Mingxiao, Lei Juan, Lu Chenqi, Cao Rujun, Dai Nianhua, Zhan Deyang, Tong Mei, Lou Zhiming, Ding Yonggang, Chai Jing, Che Jing (2025) Population status and habitat of Critically Endangered Jiangxi giant salamander (Andrias jiangxiensis). Biodiversity Science, 33, 24145. DOI: 10.17520/biods.2024145.
图1 江西靖安县北潦河金家水支流江西大鲵野外种群调查区域
Fig. 1 Field survey of Jiangxi giant salamander in the Jinjia tributary of the Beiliao River, Jing’an County, Jiangxi, China
图2 江西大鲵野外种群(n = 313)体长(a)与体重(b)分布直方图
Fig. 2 Histogram of body size (a) and body weight (b) distribution of the wild population of Jiangxi giant salamander (n = 313)
图3 2021-2023年江西大鲵野外调查成体和亚成体、幼鲵目击频率月份变化。缺标志符号的月份未调查。
Fig. 3 Monthly monitoring of catch per unit effort (CPUE) of Jiangxi giant salamander in 2021-2023. Months without markers were not surveyed.
图4 江西大鲵繁殖期雌雄个体泄殖腔孔性征差异。(a)雌性, 泄殖腔孔周围内凹; (b)雄性, 泄殖腔孔周围隆起。
Fig. 4 Comparison of the sexual characteristics of male and female individuals during the breeding period of the Jiangxi giant salamander. (a) Female, concave around the cloaca; (b) Male, convex around the cloaca.
图6 野外调查监测到的江西大鲵受威胁因素。(a) 2021年1月大鲵栖息树根洞穴位置外景; (b) 2021年7月山洪改变河道基底, 图a所示栖息洞穴被摧毁; (c) 2022年9月溪流上游枯水断流; (d)大鲵呕吐物现幼鲵残骸: 冬季枯水期发现一亚成体(PIT: 900******010530, 体长33 cm)的呕吐物中有未完全消化的幼鲵残骸(体长约10 cm)。
Fig. 6 Threat factors to the Jiangxi giant salamander observed during field surveys. (a) The view of the habitat cave of the Jiangxi giant salamander in January 2021; (b) In July 2021, flash floods altered the riverbed, and the habitat cave shown in Figure (a) was destroyed; (c) In September 2022, upstream reach of Jinjia tributary dried up during the low-flow period; (d) Giant salamander vomit contains larvae remains: During the winter dry season, vomit from a juvenile (PIT: 900******010530, body size 33 cm) was found containing incompletely digested larvae salamander remains (about 10 cm).
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