Abstract：
:To test ecological niche theory, this study investigated the spatial patterns and the environmental niches of native and non-native fishes within the invaded Great Fish River system, South Africa. For the native fishes, there were contrasting environmental niche breadths that varied from being small to being large and overlapped for most species, except minnows that were restricted to headwater tributaries. In addition, there was high niche overlap in habitat association among fishes with similar distribution. It was therefore inferred that habitat filtering-driven spatial organisation was important in explaining native species distribution patterns. In comparison, most non-native fishes were found to have broad environmental niches and these fishes showed high tolerance to environmental conditions, which generally supported the niche opportunity hypothesis. The proliferation of multiple non-native fishes in the mainstem section suggest that they form a functional assemblage that is probably facilitated by the anthropogenic modification of flow regimes through inter-basin water transfer. Based on the distribution patterns observed in the study, it was inferred that there was a likelihood of negative interactions between native and non-native fishes. Such effects are likely to be exacerbated by altered flow regime that was likely to have negative implications for native ichthyofauna.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Kadye WT,Booth AJdoi
10.1111/jfb.13988subject
Has Abstractpub_date
2020-05-01 00:00:00pages
1269-1277issue
5eissn
0022-1112issn
1095-8649journal_volume
96pub_type
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更新日期：2014-11-01 00:00:00
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更新日期：2014-04-01 00:00:00
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journal_title：Journal of fish biology
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