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Impacts of mariculture practices on the temporal distribution of macrobenthos in Sandu Bay, South China

Abstract

Sandu Bay is located in the East China Sea and is characterized by high-density fish farming and kelp culture. Despite this, little is known about the impacts of these different mariculture practices on the local environment. We investigated the temporal variation in macrobenthos and environmental conditions at three sites in the bay (fish farming site, kelp culture site, and a control site). We collected water and sediment samples during nine cruises between May 2009 and February 2010. The density of macrobenthos peaked at the fish farming site in July (655 ind./m2) whereas density did not fluctuate as widely at the other two sites. Biomass varied significantly at both the control and kelp culture sites, but had only a single peak at the fish farming site in June (21.90 g/m2). The dominant species varied throughout the study period at the control and kelp culture sites, whereas a single terebellid species (Lysilla pacifica) dominated the macrobenthos at the fish farming site. The diversity index H′ increased at the control site beginning in February then decreased after May, whereas H′ was low at the other sites in December. The mean dissolved oxygen level was highest at the control site (6.59 mg/L) and lowest at the fish farming site (5.54 mg/L). DO levels were lowest at all sites in summer (July and August). The sediment acid volatile sulfide content was higher at the fish farming site (1.46 mg/g dry weight) than those at the kelp culture and control sites (1.22 and 0.14 mg/g, respectively). Our results suggest that mariculture practices have a clear impact on the benthic environment/community in Sandu Bay.

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Correspondence to Jin Zhou.

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Supported by the Special Research Fund for the National Non-Profit in East China Sea Fisheries Research Institute (No. 2008M16)

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Zhou, J. Impacts of mariculture practices on the temporal distribution of macrobenthos in Sandu Bay, South China. Chin. J. Ocean. Limnol. 30, 388–396 (2012). https://doi.org/10.1007/s00343-012-1150-7

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  • DOI: https://doi.org/10.1007/s00343-012-1150-7

Keyword

  • mariculture
  • temporal variation
  • macrobenthic community
  • Sandu Bay