Original Research

Spatial variation in the structure of fish assemblages in the Vaalbos National Park, South Africa

I.A. Russell
Koedoe | Vol 40, No 1 | a267 | DOI: https://doi.org/10.4102/koedoe.v40i1.267 | © 1997 I.A. Russell | This work is licensed under CC Attribution 4.0
Submitted: 01 August 1997 | Published: 01 August 1997

About the author(s)

I.A. Russell,, South Africa

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Abstract

Fish assemblages were sampled at nine sites in the lower Vaal River in the Vaalbos National Park and adjacent properties. A total of 1543 fish from 10 species was recorded. Ordination revealed spatial variation in assemblage structure, with the distinction primarily between communities in rapids and deep pools. Flow velocity, depth and percentage cover were important determinants offish assemblage structure. The length frequency distribution of abundant species indicated successful recruitment. Several differences in the species compliment compared to earlier studies were evident, including high abundance of Barbus paludinosus and Austro^lanis sclateri, and the absence of Barbus anoplus. The length-mass relationships of large cyprmids indicated long-term declines in the physical condition of fish.

Keywords

freshwater fish, community structure, Vaal River, Vaalbos National Park

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Crossref Citations

1. Conservation status and distribution of freshwater fishes in South African national parks
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African Zoology  vol: 46  issue: 1  first page: 117  year: 2011  
doi: 10.1080/15627020.2011.11407485