Volume 33 Issue 3
May  2012
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ZHANG Heng, YANG Sheng-Long, MENG Hai-Xing. Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary. Zoological Research, 2012, 33(3): 255-260. doi: 10.3724/SP.J.1141.2012.03255
Citation: ZHANG Heng, YANG Sheng-Long, MENG Hai-Xing. Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary. Zoological Research, 2012, 33(3): 255-260. doi: 10.3724/SP.J.1141.2012.03255

Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary

doi: 10.3724/SP.J.1141.2012.03255
  • Received Date: 2011-10-26
  • Rev Recd Date: 2012-01-12
  • Publish Date: 2012-06-22
  • Based on four surveys of eggs and larvae in the Yangtze estuary in 2005 (April and November) and 2006 (April and September), combined with the historical data of the wetland in 1990 (September) and 1991 (March), we analyzed seasonal changes in fish species composition and quantity of ichthyoplankton. Thirty-six species of egg and larvae were collected and marine fish species were the highest represented ecological guild. Average fish species and average abundance in spring were lower than in autumn for every survey. The total number of eggs in brackish water was higher than in fresh water, but the total number of larvae and juveniles in brackish water was lower. The abundance of eggs and larvae during from 2005 to 2006 in both spring and autumn was higher compared to those from 1990 to 1991. Obvious differences in species composition in September between 1990 and 2006 were found, especially for Erythroculter ilishaeformis and Neosalanx taihuensis. Fish species composition and quantity within the ichthyoplankton community has obviously changed in the Yangtze estuary over the last 20 years.
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Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary

doi: 10.3724/SP.J.1141.2012.03255

Abstract: Based on four surveys of eggs and larvae in the Yangtze estuary in 2005 (April and November) and 2006 (April and September), combined with the historical data of the wetland in 1990 (September) and 1991 (March), we analyzed seasonal changes in fish species composition and quantity of ichthyoplankton. Thirty-six species of egg and larvae were collected and marine fish species were the highest represented ecological guild. Average fish species and average abundance in spring were lower than in autumn for every survey. The total number of eggs in brackish water was higher than in fresh water, but the total number of larvae and juveniles in brackish water was lower. The abundance of eggs and larvae during from 2005 to 2006 in both spring and autumn was higher compared to those from 1990 to 1991. Obvious differences in species composition in September between 1990 and 2006 were found, especially for Erythroculter ilishaeformis and Neosalanx taihuensis. Fish species composition and quantity within the ichthyoplankton community has obviously changed in the Yangtze estuary over the last 20 years.

ZHANG Heng, YANG Sheng-Long, MENG Hai-Xing. Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary. Zoological Research, 2012, 33(3): 255-260. doi: 10.3724/SP.J.1141.2012.03255
Citation: ZHANG Heng, YANG Sheng-Long, MENG Hai-Xing. Distribution and changes in species composition and abundance of ichthyoplankton in the Yangtze estuary. Zoological Research, 2012, 33(3): 255-260. doi: 10.3724/SP.J.1141.2012.03255
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