Long-term trends of macrobenthos in Changjiang Estuary, China in relation to environmental changes

LIU Lusan; ZHENG Binghui; LI Baoquan; CAI Wenqian; HAN Qingxi; LIN Kuixuan

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LIU Lusan, ZHENG Binghui, LI Baoquan, CAI Wenqian, HAN Qingxi, LIN Kuixuan. Long-term trends of macrobenthos in Changjiang Estuary, China in relation to environmental changes[J]. Haiyang Xuebao, 2012, 34(3): 134-145.

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Long-term trends of macrobenthos in Changjiang Estuary, China in relation to environmental changes

1.
State Environmental Protection key Laboratory of Estuary and Coastal Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2.
Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
3.
State Environmental Protection key Laboratory of Estuary and Coastal Environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;College of Water Sciences, Beijing Normal University, Beijing 100875, China

Received Date: 2011-06-20
Rev Recd Date: 2011-10-21

Abstract

Abstract

The macrobenthos samples collected from Changjiang Estuary, China in 2009 and 2010 were identified to clarify the current state, and the historical data obtained from essentially the same sampling area were analyzed to get the long-term trends and their response to environmental changes over the past 30 years. The average total species number exhibited an obvious fluctuation over this 30 year period, which includes three periods, e.g., period one-before 1990s, the total species number maintained relatively high value; period two-from 1990s to 2005, the total species number decreased markedly; and period three-after 2005, the total species number increased rapidly. The average biomass and the abundance also had similar trends over the last 30 years. The trends of species composition of macrobenthos community was that some long-lived, larger sized, stress intolerant resident species had been replaced by some opportunistic, short-lived, small sized taxa, especially some opportunistic polychaeta species, which indicated the macrobenthos community of the study area was unhealthy and unstable. The results of MDS ordination also approximately coincide with the above results. The integrated impacts both from climate changes and from anthropogenic disturbances, such as aquaculture, coastal land reclamation and sewage discharge were the triggers for these long-term changes.
- macrobenthos,
- long-term trends,
- Changjiang Estuary

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References

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