River hydrology mediates fish invasions in Addo Elephant National Park, South Africa Article Swipe
Darragh J. Woodford
,
Josie South
,
Lubabalo Mofu
,
Josephine Pegg
·
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.4102/koedoe.v66i1.1806
YOU?
·
· 2024
· Open Access
·
· DOI: https://doi.org/10.4102/koedoe.v66i1.1806
Invasive freshwater fish can often have severe negative effects on native fishes in river systems. The interactions between hydrology and habitat variability can mediate the speed and success of individual invasions and the consequent impact on biodiversity. The rivers within Addo Elephant National Park (AENP) in the Eastern Cape, South Africa experience cyclical droughts and wet periods and as a result are naturally episodic. These rivers were recently invaded by three non-native species, the invasive largemouth bass (Micropterus salmoides) as well as the extralimital sharptooth catfish (Clarias gariepinus) and Mozambique tilapia (Oreochromis mossambicus). Monitoring of key sampling sites along two rivers over a 12-year period that included two major droughts revealed unexpected patterns in the spread of these species and their interactions with native fishes. On the Coerney River, C. gariepinus repeatedly invaded and was extirpated from a seasonal reach of the river, wherein O. mossambicus was only occasionally captured. On the Wit River, two apparently independent introductions of M. salmoides in the lower and upper reaches of the river resulted in patchy habitat occupancy over the course of 12 years. While C. gariepinus regularly co-occurred with native species, M. salmoides appeared to locally extirpate the endangered Eastern Cape redfin (Pseudobarbus afer). During drought, both species persisted in close but disconnected pools, suggesting that the episodic hydrology and geomorphology of these rivers may offer temporary predation refugia for native species during drought. Conservation implications: Drought in episodic rivers can mitigate against the impact and spread of freshwater invasions within protected areas. Effects of drying on invasion corridors and spatial interactions with native species should be taken into consideration when managing such invasions. Severe droughts also offer an opportunity to actively control invasive species when they are confined to accessible drought refugia within the protected area.
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Metadata
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- Language
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- Landing Page
- https://doi.org/10.4102/koedoe.v66i1.1806
- https://koedoe.co.za/index.php/koedoe/article/download/1806/3260
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All OpenAlex metadata
Raw OpenAlex JSON
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https://doi.org/10.4102/koedoe.v66i1.1806Digital Object Identifier
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River hydrology mediates fish invasions in Addo Elephant National Park, South AfricaWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
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2024Year of publication
- Publication date
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2024-05-20Full publication date if available
- Authors
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Darragh J. Woodford, Josie South, Lubabalo Mofu, Josephine PeggList of authors in order
- Landing page
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https://doi.org/10.4102/koedoe.v66i1.1806Publisher landing page
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https://koedoe.co.za/index.php/koedoe/article/download/1806/3260Direct link to full text PDF
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YesWhether a free full text is available
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goldOpen access status per OpenAlex
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https://koedoe.co.za/index.php/koedoe/article/download/1806/3260Direct OA link when available
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1Total citation count in OpenAlex
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10Other works algorithmically related by OpenAlex
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| referenced_works | https://openalex.org/W2166298039, https://openalex.org/W2215840329, https://openalex.org/W2152586125, https://openalex.org/W2528543588, https://openalex.org/W4360779253, https://openalex.org/W1973765642, https://openalex.org/W2168836999, https://openalex.org/W1969551702, https://openalex.org/W2062102335, https://openalex.org/W1982746850, https://openalex.org/W2599318626, https://openalex.org/W2175709104, https://openalex.org/W1971625691, https://openalex.org/W2001112641, https://openalex.org/W4254801438, https://openalex.org/W2793636538, https://openalex.org/W2089435058, https://openalex.org/W3213732436, https://openalex.org/W2525564322, https://openalex.org/W4391024894, https://openalex.org/W2315205425, https://openalex.org/W3127240605, https://openalex.org/W2009618907, https://openalex.org/W1899919544, https://openalex.org/W3157370733, https://openalex.org/W2096461418, https://openalex.org/W2910578398, https://openalex.org/W3032075517, https://openalex.org/W2066488873, https://openalex.org/W3013794662, https://openalex.org/W2150235740, https://openalex.org/W1961953331, https://openalex.org/W3049119755, https://openalex.org/W2989998356, https://openalex.org/W6797317855, https://openalex.org/W1991691903, https://openalex.org/W159567818, https://openalex.org/W1966707498, https://openalex.org/W4236914396, https://openalex.org/W4311611355, https://openalex.org/W2341276688, https://openalex.org/W2609902142, https://openalex.org/W2914058127, https://openalex.org/W2260476723, https://openalex.org/W2345263745, https://openalex.org/W2133123187, https://openalex.org/W1990269456, https://openalex.org/W2039845464, https://openalex.org/W2136729849, https://openalex.org/W3044868472, https://openalex.org/W2050100397, https://openalex.org/W4291820754 |
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