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Effects of long-term anthropogenic perturbations on three subtidal epibenthic molluscan communities in Hong Kong
Leung, K.F. (2003). Effects of long-term anthropogenic perturbations on three subtidal epibenthic molluscan communities in Hong Kong, in: Morton, B. (Ed.) Perspectives on marine environment change in Hong Kong and Southern China, 1977-2001: Proceedings of an International Workshop Reunion Conference, Hong Kong, 21-26 October 2001. pp. 655-717
In: Morton, B. (Ed.) (2003). Perspectives on marine environment change in Hong Kong and Southern China, 1977-2001: Proceedings of an International Workshop Reunion Conference, Hong Kong, 21-26 October 2001. Hong Kong University Press: Hong Kong. ISBN 9789882202429 . 824 pp.
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| Abstract |
This paper presents the results of the 1992, 1995, 1998 and 2001 benthic trawl surveys carried out in the waters of Hong Kong. It aimed at identifying any temporal and/or spatial changes in three subtidal epibenthic molluscan communities in the northwestern, southeastern and eastern sectors of Hong Kong's territorial waters. Each sector is characterized not only by different hydrographic regimes but also intensities and frequencies of anthropogenic perturbations, particularly fishing by bottom gears, eutrophication, reclamation, sediment dredging and dumping. Non-parametric analyses were performed to identify and compare any such changes. The composition of the three molluscan assemblages showed different degrees of change in relation to external factors over the period between 1992 and 2001. These modifications were characterized by more or less rapid and abrupt replacements, in terms of species richness, density and diversity, of distinct families of Bivalvia and Gastropoda, but the amplitude and resilience of these were different between sites. A common feature shared by the three surveyed sectors in response to anthropogenic impacts was, however, the structure of their resident communities which are now dominated by generalist, often scavenging and deposit feeding gastropods and a suite of highly tolerant bivalves, with respect to physical impacts and periodic anoxia. The results obtained for molluscan communities in 1992, 1995, 1998 and 2001, suggest that the single-most important factor driving long-term changes in them is fishing by bottom gears. |
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