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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on April 2, 2009
ICES Journal of Marine Science: Journal du Conseil 2009 66(5):797-810; doi:10.1093/icesjms/fsp078
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The effects of system-scale removal of oyster-culture racks from Tapong Bay, southwestern Taiwan: model exploration and comparison with field observations

Hsing-Juh Lin1,2, Kwang-Tsao Shao3, Hwey-Lian Hsieh3, Wen-Tseng Lo4 and Xiao-Xun Dai1

1 Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
2 Institute of Marine Environmental Chemistry and Ecology, National Taiwan Ocean University, Keelung 202, Taiwan
3 Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan
4 Department of Marine Resources, National Sun Yat-sen University, Kaohsiung 804, Taiwan

Correspondence to H-J. Lin: tel: +886 4 22840416; fax: +886 4 22874740; e-mail: hjlin{at}dragon.nchu.edu.tw.

Lin, H-J., Shao, K-T., Hsieh, H-L., Lo, W-T., and Dai, X-X. 2009. The effects of system-scale removal of oyster-culture racks from Tapong Bay, southwestern Taiwan: model exploration and comparison with field observations. – ICES Journal of Marine Science, 66: 797–810.

Using Ecopath with Ecosim, a mass-balance trophic model was manipulated to predict temporal responses of community biomasses to the system-scale removal of oyster-culture racks from Tapong Bay, a eutrophic and poorly flushed lagoon in tropical Taiwan. The model predictions were further compared with separate field observations over a period of 2.5 years. The removal of the oysters was predicted to result in increases in most community biomasses. The model predictions approximately matched the trends of the field observations for phytoplankton, zooplankton, detritivorous fish, and detritus after the removal, so providing a trophic explanation for the responses of these communities in the lagoon. The observed biomasses of benthic communities declined, however, probably as a result of a reduction in biodeposition from the oysters. The biomasses of pelagic fish and soft-bottom fish increased, but that of reef fish decreased after the removal. The field observations demonstrated that plankton communities were controlled, but the biomasses of the benthic and fish communities were enhanced by a high density of suspended oyster culture in a eutrophic lagoon.

Keywords: coastal lagoon, Ecopath, Ecosim, oyster-hanging culture, top-down control

Received 23 July 2008; accepted 27 February 2009; advance access publication 2 April 2009.


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