Zooplankton community size-structure change and mesh size selection under the thermal stress caused by a power plant in
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Zooplankton community size-structure change and mesh size selection under the thermal stress caused by a power plant in a semi-enclosed bay Qianwen Shao1, 2, Yifeng Zhu1*, Meixia Dai1, Xia Lin1, Chengxu Zhou1, Xiaojun Yan1* 1 Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832,
China 2 Ningbo Institute of Oceanography, Ningbo 315832, China
Received 20 December 2019; accepted 17 April 2020 © Chinese Society for Oceanography and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract
Zooplankton samples were collected using 505, 160 and 77 μm mesh nets around a power plant during four seasons in 2011. We measured total length of zooplankton and divided zooplankton into seven size classes in order to explore how zooplankton community size-structure might be altered by thermal discharge from power plant. The total length of zooplankton varied from 93.7 to 40 074.7 μm. The spatial distribution of mesozooplankton (200 −2 000 μm) populations were rarely affected by thermal discharge, while macro- (2 000 −10 000 μm) and megalo-zooplankton (>10 000 μm) had an obvious tendency to migrate away from the outfall of power plant. Thus, zooplankton community tended to become smaller and biodiversity reduced close to power plant. Moreover, we compared the zooplankton communities in three different mesh size nets. Species richness, abundance, evenness index and Shannon−Wiener diversity index of the 505 μm mesh size were significantly lower than those recorded from the 160 and 77 μm mesh size. Average zooplankton abundance was highest in the 77 μm mesh net ((27 690.0±1 633.7) ind./m3), followed by 160 μm mesh net ((9 531.1±1 079.5) ind./m3), and lowest in 505 μm mesh net ((494.4±104.7) ind./m3). The ANOSIM and SIMPER tests confirmed that these differences were mainly due to small zooplankton and early developmental stages of zooplankton. It is the first time to use the 77 μm mesh net to sample zooplankton in such an environment. The 77 μm mesh net had the overwhelming abundance of the copepod genus Oithona, as an order of magnitude greater than recorded for 160 μm mesh net and 100% loss through the 505 μm mesh net. These results indicate that the use of a small or even multiple sampling net is necessary to accurately quantify entire zooplankton community around coastal power plant. Key words: zooplankton, coastal power plant, temperature elevation, size class, community structure, mesh size selection Citation: Shao Qianwen, Zhu Yifeng, Dai Meixia, Lin Xia, Zhou Chengxu, Yan Xiaojun. 2020. Zooplankton community size-structure change and mesh size selection under the thermal stress caused by a power plant in a semi-enclosed bay. Acta Oceanologica Sinica, 39(8): 62–70, doi: 10.1007/s13131-020-1634-9
1 Introduction Zooplankton is the dominant plankton in marine systems and important to aquatic food webs. Therefore, quantitative assessments are necessary to properly evaluate their role. Among the many variables that may influence the accuracy of zooplankton sampling, s
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