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Chinese Journal of Applied Ecology ›› 2020, Vol. 31 ›› Issue (3): 1008-1014.doi: 10.13287/j.1001-9332.202003.038

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Spatial pattern in larval distribution, settlement and growth of Crassostrea sikamea in Xiangshan Bay, Zhejiang Province, China

JIANG Wei1,3, WANG Tao-ni1,3, CHEN Shai2, SUN Zhao-yue1,3, FAN Rui-liang1, LI Nan-nan1, LI Xue-ying1, QUAN Wei-min1*   

  1. 1Ministry of Agriculture and Rural Affairs Key Laboratory of East China Sea Fishery Resources Exploitation, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China;
    2Ministry of Agriculture and Rural Affairs Key Laboratory of Oceanic and Polar Fisheries, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China;
    3College of Fishery and Life Science, Shanghai Oceanography University, Shanghai 201300, China
  • Received:2019-09-18 Online:2020-03-15 Published:2020-03-15
  • Contact: E-mail: quanweim@163.com
  • Supported by:
    This work was supported by the Basic Research Fund for the National Nonprofit Institutes (2015M01, L32201921880, 2019ZD0103) and the Natural Science Foundation of Shanghai (19ZR1469900)

Abstract: The migration and settlement of oyster larvae significantly affect the distribution, recruitment, establishment and ecological services of oyster populations. We investigated the variations of Crassostrea sikamea larvae abundances between the two water layers and between the two experimental sites (seed bed and spawning bed) in Xiangshan Bay within a tidal cycle (9 sampling times), and explored the spatial patterns in larval settlement and spat growth at three intertidal zones (top, T; middle, M and bottom, B) of both experimental sites by a field settlement experiment. At the seed bed and spawning bed, oyster larvae abundance at the surface water significantly changed with sampling time. At the seed bed, oyster larvae abundance (20.8±5.6 larvae·L-1) was greatest at the high flood tide, and was significantly greater than that at the other eight sampling times. Contrasting results were found at the spawning bed where oyster larvae abundance was the lowest (0.1±0.1 larvae·L-1) at the high flood tide. At each site, oyster larvae abundance at the bottom water did not change within the tidal cycle. At the seed bed, total abundance, survival rate and shell height of the settled oysters significantly varied across intertidal zones, ranking as B>T=M for total oyster abundance, and T>M>B for survival rate and shell height. There was no significant difference in live spat abundance among intertidal zones. At the spawning bed, the total and live abundances, survival rate and shell height of the settled oysters had no difference among intertidal zones. Our results indicate that oyster larvae commonly settle at the high flood tide, and the abundance of settled spats are similar between seed bed and spawning bed.