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Changes in biological traits of macro-benthic communities subjected to different intensities of demersal trawling along the west coast of southern Africa

Published online by Cambridge University Press:  09 July 2013

A. Fleddum ,
L.J. Atkinson ,
J.G. Field  and
P. Shin
A. Fleddum
Affiliation:
The Bellona Foundation, PO Box 2141, Grünerløkka, N-0505 Oslo, Norway Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
L.J. Atkinson
Affiliation:
Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
J.G. Field*
Affiliation:
Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
P. Shin
Affiliation:
Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
*
Correspondence should be addressed to: J.G. Field, Marine Research Institute, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa email: jgfielduct@gmail.com
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Abstract

Biological traits analysis (BTA) is considered to be a powerful technique for describing the ecological functioning of marine benthic assemblages. This study is the first to apply BTA to assess differences in the traits of benthic faunal assemblages between areas exposed to heavy and light trawling in a major upwelling ecosystem along the west coast of southern Africa. The data were collected from two sampling locations in Namibia and six sampling locations in South Africa. The intensity of trawling varied from area to area. Significant differences in biological traits (BT) were detected between heavily and lightly trawled areas. Weighted infaunal traits showed significant differences between heavily and lightly trawled areas for 17% of the traits investigated, while 24% of epifaunal traits investigated were significantly different between areas of different trawling intensities. This suggests that the measured BTs of the epifauna might be more sensitive to trawling disturbances than BTs of the infauna. The infaunal traits differed significantly between areas with larger or smaller proportions of sand and mud. Nevertheless, more of the significant differences in infaunal BTs were related to variations in trawling intensity than to variations in sediment composition. Significant modifications of BTs are likely to lead to modified functioning of the community and provide more general potential indicators for management than those based on species. The study confirms the need for more basic biological and life history data on macro-benthic invertebrates but nevertheless shows that BTA detected specific features that correlate with trawling intensity and that these features may be important for epifaunal assemblage functioning.

Keywords

marine benthic epifaunasoft sediment infaunabiological traitsecosystem approach to fisheries managementtrawling impactcommunity functioning
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 8 , December 2013 , pp. 2027 - 2038
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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