Study on the niche of macrozoobenthic dominant species in the rocky intertidal zone of islands off sourthern Zhejiang

doi:10.3969/j.issn.1001-909X.2021.01.009

Abstract

Abstract: To understand the trends of the dominant species of macrozoobenthos and their niches in the intertidal zone of islands off sourthern Zhejiang, the interannual changes and succession of macrozoobenthic community structure were analyzed based on the data collected from the November of 1990, 2006, 2010 and 2016 in Nanji Islands, Beilong-Beiji Islands and Dongtou Islands. The results showed that there were 15 dominant species of macrozoobenthos and the top four dominant species were Tetraclita japonica, Septifer virgatus, Thais clavigera and Nodilittorina exigua.The T. japonica had been gradually replaced by S. virgatusin the past 30 years. In terms of geography, the most dominant species in Beilong-Beiji Islands and Dongtou Islands was T. japonica, while in the Nanji Islands was S. virgatus. The niche breadth (B_i) of the dominant species was 0-0.97, and species with B_i greater than 0.70 were T. clavigera, Liolophura japonica, S. virgatus, N. exigua, Capitulum mitella and T. japonica, indicating that these species appeared at many resource sites and had strong adaptability to the environment. Species with B_i less than 0.4 were Trichomya hirsuta, Megabalanus volcano, Septiper excisus,Saccostrea kegaki,Mytilus coruscus and Chthamalus challengeri, indicating these species only appeared at very few resource sites and were weak in resource utilization. The niche overlap value(O_ik) of the dominant species was 0-0.96. The species with B_i greater than 0.70 had higher O_ik, and O_ik were all greater than 0.53. The species with B_i between 0.4-0.7 had O_ik among 0.34-0.66, while the species with B_i less than 0.4 had not necessarily lower O_ik, and their O_ik were among 0 and 0.69, indicating that the species with larger B_i had higher O_ik, but species with small B_i may have high or low O_ik.

Key words: macrozoobenthos, community structure, niche, interspecific competition

CLC Number:

Q958.8

PENG Xin, ZHANG Huawei, TANG Jiu, QIU Jianbiao, CHEN Shaobo. Study on the niche of macrozoobenthic dominant species in the rocky intertidal zone of islands off sourthern Zhejiang[J]. Journal of Marine Sciences, 2021, 39(1): 79-85.

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