NDLI: The invasibility of small headwater streams by an emerging invader, Clarias gariepinus

Content Provider	Springer Nature Link
Author	Ellender, Bruce R. Woodford, Darragh J. Weyl, Olaf L. F.
Copyright Year	2014
Abstract	African sharptooth catfish Clarias gariepinus has been spread globally and is proven to be invasive with demonstrable impacts on a variety of biota in recipient ecosystems. There are concerns that this species will invade headwater stream communities that are already considered fragile and heavily impacted by non-native invasive fishes. There is however no information on the ability of C. gariepinus to penetrate or establish in these environments. This paper uses data collected over a seven year period from three episodic headwater streams in the Cape Floristic Region of South Africa to assess the ability of C. gariepinus to invade headwater habitats from downstream source populations. Data demonstrate that C. gariepinus invaded all three headwater tributaries and was able to penetrate previously non-invaded threatened fish refugia. Clarias gariepinus however failed to establish in headwaters and their presence was casual with individuals migrating from mainstem sources. Headwater incursions were dynamic and C. gariepinus reinvaded streams following their extirpation through drought. These results indicate headwater streams to be invasible by C. gariepinus and an assessment of potential impact on headwater communities requires urgent attention.
Starting Page	57
Ending Page	61
Page Count	5
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	17
Issue Number	1
e-ISSN	15731464
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-07-02
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	African sharptooth catfish Episodic streams Headwater refugia Reinvasion Ecology Freshwater & Marine Ecology Plant Sciences Developmental Biology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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