Recovery of a subtropical headwater fish community following a large flood, Klaserie River, Limpopo River System, South Africa

IF 1.6 3区 农林科学 Q3 FISHERIES
Thabo David Mohlala, Sean Murray Marr, Anthony Michael Swemmer
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引用次数: 0

Abstract

Headwaters are important refuges for threatened fishes and play an important role in their conservation. The effects of large flooding events on headwater fish assemblages are under studied in southern Africa. In January 2012, heavy rainfall resulted in a large flood in the upper Klaserie River, Olifants River, and Limpopo River System, South Africa. This flood had an estimated return level of 225 years and caused significant ecological and economic damage. This study aimed to explore the impact of a large flood on the fish assemblage and substrate in the headwaters of a subtropical stream. The fish communities and selected substrate variables were collected at 10 sites. Sites were sampled at six monthly intervals thrice before and thrice after the flood. Fish were collected by electrofishing and substrate quantified visually. Changes in habitat resulted from the flood included the scouring of gravel sand and mud, greater exposure of bedrock and boulder substrates, increased stream width, and decreased stream depth in all zones. The fish community showed an increase in abundance for all but three species, colonisation of upstream sites, and colonisation of the study area by six species. The majority of fish species have opportunistic life-history traits, which could explain the rapid colonisation and increase in abundance. The flood occurred in the middle of the breeding season for most the fish species, and this resulted in an increase of abundance for these species and provided opportunities for upstream colonisation. The impact of late season and aseasonal large floods requires further study.

大洪水后亚热带上游鱼类群落的恢复,南非林波波河水系 Klaserie 河
源头水域是濒危鱼类的重要庇护所,在保护鱼类方面发挥着重要作用。南部非洲正在研究大洪水事件对上游鱼类群落的影响。2012 年 1 月,暴雨导致南非 Klaserie 河上游、Olifants 河和林波波河水系发生大洪水。这次洪水的重现水位估计为 225 年一遇,造成了重大的生态和经济损失。本研究旨在探讨大洪水对亚热带溪流上游鱼类群落和底质的影响。在 10 个地点收集了鱼类群落和选定的底质变量。洪水前后各三次,每次间隔 6 个月。通过电鱼收集鱼类,并对底质进行目测量化。洪水导致的生境变化包括:砾石沙和淤泥被冲刷,基岩和巨石底质更易暴露,溪流宽度增加,以及所有区域的溪流深度降低。鱼类群落显示,除三种鱼类外,其他所有鱼类的数量都有所增加,有六种鱼类在上游地点定居,有六种鱼类在研究区域定居。大多数鱼类都具有机会主义的生活史特征,这可以解释为什么会出现快速定殖和丰量增加的现象。洪水发生在大多数鱼类物种繁殖季节的中期,这导致这些物种的数量增加,并为其向上游定殖提供了机会。晚期和季节性大洪水的影响还需要进一步研究。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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