虹鳟(Oncorhynchus mykiss)入侵对南非姆普马兰加省布莱德河本地鱼类群落的影响

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
Lerato T. Maimela, C. Chimimba, T. Zengeya
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引用次数: 2

摘要

本研究调查了虹鳟(Oncorhynchus mykiss)入侵对布莱德河上游流域本地鱼类群落的影响。2017年9月至2018年10月,在Blyde河和Treur河的11个地点使用电捕鱼和fyke网进行了鱼类调查。利用多元分析检验了不同地点的物种组成、相对丰度和群落结构的差异。总共捕获了十种鱼类。鱼类群落的组成和丰度存在显著差异,这可归因于八哥的入侵和栖息地的变化。历史上出现在整个上游流域的本地物种的种群,如treurensis Enteromius,在O.mykiss的存在下大大减少和分散。然而,瀑布等河流内的迁徙障碍阻止了八哥的上游迁徙,而这些没有入侵的地区有本地鱼类的残余种群,这些种群似乎基本上完好无损。这一发现与其他研究一致,这些研究表明,引入的外来掠食性鱼类会对鱼类群落产生重大影响,并强调有必要防止在生物多样性敏感地区,如山区源头溪流,由当地特有的和范围有限的明鱼栖息,由人类协助引入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The effect of rainbow trout (Oncorhynchus mykiss) invasions on native fish communities in the subtropical Blyde River, Mpumalanga province, South Africa
This study investigated the effects of rainbow trout (Oncorhynchus mykiss) invasion on native fish communities in the upper Blyde River catchment. A fish survey was undertaken between September 2017 and October 2018 from 11 sites in the Blyde and Treur Rivers using electrofishing and fyke nets. Differences in species composition, relative abundance, and community structure among sites were tested using multivariate analysis. A total of ten fish species were captured. There were significant differences in composition and abundance between fish communities that could be attributed to O. mykiss invasion and variation in habitats. Populations of native species that historically occurred throughout the upper catchment, such as Enteromius treurensis, were greatly reduced and fragmented in the presence of O. mykiss. However, instream migration barriers such as waterfalls have prevented upstream migration of O. mykiss, and these invasion-free areas have remnant populations of native fishes that appear to be largely intact. This finding is consistent with other studies that have shown that introduced alien predatory fish can have a significant effect on fish communities and highlighted the need to prevent human-facilitated introductions in biodiversity sensitive areas, such as mountain headwater streams, that are inhabited by endemic and range-restricted minnows.
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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