Detecting impacts of invasive non-native sharptooth catfish, Clarias gariepinus, within invaded and non-invaded rivers

Kadye, Wilbert T.; Booth, Anthony J.

doi:10.1007/s10531-012-0291-5

Cited by 19 publications

(17 citation statements)

References 64 publications

(87 reference statements)

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“…Power, ; Brett & Goldman, ), which are partly explained by the inability of native prey to respond to predators that they do not naturally coexist with (e.g. Simon & Townsend, ; Stoks et al ., ; Kadye & Booth, ). The large increases in nitrogen compounds in invaded habitats have been related to excretion and bioturbation and are thus proportional to the invader's biomass (Driver et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Global ecological impacts of invasive species in aquatic ecosystems

Gallardo

Clavero

Sánchez

et al. 2015

Global Change Biology

852

520

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The introduction of invasive species, which often differ functionally from the components of the recipient community, generates ecological impacts that propagate along the food web. This review aims to determine how consistent the impacts of aquatic invasions are across taxa and habitats. To that end, we present a global meta-analysis from 151 publications (733 cases), covering a wide range of invaders (primary producers, filter collectors, omnivores and predators), resident aquatic community components (macrophytes, phytoplankton, zooplankton, benthic invertebrates and fish) and habitats (rivers, lakes and estuaries). Our synthesis suggests a strong negative influence of invasive species on the abundance of aquatic communities, particularly macrophytes, zooplankton and fish. In contrast, there was no general evidence for a decrease in species diversity in invaded habitats, suggesting a time lag between rapid abundance changes and local extinctions. Invaded habitats showed increased water turbidity, nitrogen and organic matter concentration, which are related to the capacity of invaders to transform habitats and increase eutrophication. The expansion of invasive macrophytes caused the largest decrease in fish abundance, the filtering activity of filter collectors depleted planktonic communities, omnivores (including both facultative and obligate herbivores) were responsible for the greatest decline in macrophyte abundance, and benthic invertebrates were most negatively affected by the introduction of new predators. These impacts were relatively consistent across habitats and experimental approaches. Based on our results, we propose a framework of positive and negative links between invasive species at four trophic positions and the five different components of recipient communities. This framework incorporates both direct biotic interactions (predation, competition, grazing) and indirect changes to the water physicochemical conditions mediated by invaders (habitat alteration). Considering the strong trophic links that characterize aquatic ecosystems, this framework is relevant to anticipate the far-reaching consequences of biological invasions on the structure and functionality of aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Global ecological impacts of invasive species in aquatic ecosystems

Gallardo

Clavero

Sánchez

et al. 2015

Global Change Biology

852

520

View full text Add to dashboard Cite

show abstract

“…Non-native fishes have disrupted the biota of their recipient ecosystems directly through predation and competition, and indirectly by altering the behaviour and abundance of prey, and disturbing food-web interrelationships (Flecker & Townsend, 1994;Nyström & McIntosh, 2003;Baxter et al, 2004). The general theory of invasion disturbances posits that impacts are often a consequence of cumulative effects related to the distribution range of invaders, their relative abundances within that range, and their per capita effects on individuals, populations and communities of native species (Parker et al, 1999;Dunham et al, 2002;Young et al, 2010;Kadye & Booth, 2012). Assessing the role of invaders and their associated impacts within freshwater habitats is therefore essential in understanding the ecological role of non-native species in their recipient ecosystems.…”

Section: Introductionmentioning

confidence: 99%

The impact of non-native rainbow trout within Afro-montane streams in eastern Zimbabwe

et al. 2013

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Non-native trout species have been associated with many negative effects in receiving ecosystems. The first aim of this study was to determine the impact of non-native rainbow trout Oncorhynchus mykiss on distribution and abundance of native mountain catfish Amphilius uranoscopus within Afro-montane streams in Nyanga Mountains, eastern Zimbabwe. The second aim was to compare macroinvertebrate community responses to the presence of the trout and the catfish. We examined trout impact on catfish's habitat associations, whereas macro-invertebrate composition was compared using open fish and fish exclosure experiments in habitats with and without trout. Trout influenced both the distribution and abundance of the catfish that occupied shallow reaches possibly to avoid predation from trout that occurred in the deeper habitats. Within trout invaded reaches, most macro-invertebrate taxa were more abundant in exclosure than open treatments. By contrast, within trout-free reaches, most macro-invertebrates either did not differ between treatments or were generally more abundant in open than exclosure treatments. This suggests that the macro-invertebrate communities responded differently within invaded and non-invaded reaches. By influencing distribution and abundance of native biota, non-native rainbow trout may have wider ecological effects, such as influencing trophic interrelationships within invaded habitats.

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“…Aquatic biodiversity in coastal streams of the Eastern Cape province of South Africa is mainly threatened by invasive species, including black bass species (Micropterus spp. ), the sharptooth catfish (Clarias gariepinus) and banded tilapia (Tilapia sparrmanii) that have successfully established in most of the rivers where B. pallidus occur (Ellender et al 2011;Kadye and Booth 2012). A review of the conservation statuses of the two lineages would be required as B. pallidus is currently listed as Least Concern in the IUCN Red List of Threatened Species (Cambray 2007), mainly because of its perceived wide geographic range.…”

Section: Discussionmentioning

confidence: 99%

Deep genetic divergence between geographically isolated populations of the goldie barb (Barbus pallidus) in South Africa: potential taxonomic and conservation implications

et al. 2015

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Barbus pallidus as it is presently defined has a disjunct distribution that is divided between northern and southern populations in South Africa. Sequence data from the cytochrome b gene region showed two distinct lineages that correspond to these geographically distant areas. Divergence between these two lineages was relatively high (5.5-6.5%) and comparable to typical interspecific divergences found between closely related southern African cyprinid fishes. Based on this deep genetic divergence, we conclude that the northern lineage may represent a previously unrecognised species or may belong to a different, but known species or species complex not associated with 'true' B. pallidus. These findings add to a growing body of evidence that freshwater fish diversity in southern Africa requires major revision.

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Detecting impacts of invasive non-native sharptooth catfish, Clarias gariepinus, within invaded and non-invaded rivers

Abstract: In aquatic ecosystems, impacts by invasive introduced fish can be likened to press disturbances that persistently influence communities.

Cited by 19 publications

References 64 publications

Global ecological impacts of invasive species in aquatic ecosystems

Global ecological impacts of invasive species in aquatic ecosystems

The impact of non-native rainbow trout within Afro-montane streams in eastern Zimbabwe

Deep genetic divergence between geographically isolated populations of the goldie barb (Barbus pallidus) in South Africa: potential taxonomic and conservation implications

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