Mangrove fish: a comparison of community structure between forested and cleared habitats.

Huxham, Mark, Kimani, E and Augley, Julian John (2004) Mangrove fish: a comparison of community structure between forested and cleared habitats. Estuarine Coastal and Shelf Science, 60 (4). pp. 637-647. ISSN 1096 0015

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The fish communities of mangrove and cleared sites were investigated in Gazi Bay, Kenya. Five forested sites were compared with paired sites that had been cleared of mangroves by human activity. Forested sites included plantations and natural stands of Sonneratia alba and natural Rhizophora mucronata stands. Two methods of stake netting were used to take quantitative samples; method one used a single 100-m-long, 18-mm mesh net, method two used paired 24-m-long, 1-mm mesh nets—samples were taken during seven different months in 2002. Mean abundances of fish found in mangrove and cleared sites, respectively, were 0.004 m−2 and 0.014 m−2 (method 1) and 0.21 m−2 and 0.25 m−2 (method 2). Thirty species were sampled, 12 of which were found exclusively in mangrove habitats and 10 of which were limited to cleared sites. The most abundant species in mangrove plots was Atherina afra (although it was only found in two, large catches); the most abundant in cleared plots was Gerres oyena (found frequently). Mean abundance (using data pooled for all sites) was significantly higher in cleared, compared with forested, sites, and multivariate analysis showed significantly different community structures in the two habitat types. There was large variation in catch rates between dates and sites, with one forested site recording no catches at all. These results do not support the predator refuge hypothesis (which predicts higher abundance of juvenile fish inside mangroves). The low abundance of fish recorded in the mangrove sites may have been due to site-specific factors determining fish abundance within mangrove forests, to the sampling techniques used or to relatively high turbidities at these sites.

Item Type: Article
Print ISSN: 1096 0015
Electronic ISSN: 0272-7714
Uncontrolled Keywords: Mangrove; Clearing; Fish species; Fish abundance; Cleared coastlines; Forested coastlines; Stake net; East Africa; Predator refuge hypothesis; Contrary evidence;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 500 Science > 570 Life sciences; biology > 577 Ecology > 577.7 Marine ecology
500 Science > 590 Animals (Zoology) > 597 Cold-blooded vertebrates; fishes
Library of Congress Subjects: Q Science > QL Zoology
Q Science > QH Natural history
Item ID: 1702
Depositing User: RAE Import
Date Deposited: 10 Jul 2008 14:19
Last Modified: 04 Jul 2013 15:49

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