| 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 |
| Zooplankton community size-structure change and mesh size selection under the thermal stress caused by a power plant in a semi-enclosed bay |
| 滨海电厂增温对浮游动物群落粒径结构及采样网目选择的影响 |
| Received:December 20, 2019 |
| DOI：10.1007/s13131-020-1634-9 |
| Key words:zooplankton coastal power plant temperature elevation size class community structure mesh size selection |
| 中文关键词: 浮游动物 滨海电厂 升温 粒径分级 群落结构 网目选择 |
| 基金项目:The National Key Research and Development Program of China under contract No. 2018YFD0900702; the K.C. Wong Magna Fund in Ningbo University (SS). |
| Author Name | Affiliation | E-mail | | Shao Qianwen | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China
Ningbo Institute of Oceanography, Ningbo 315832, China | | | Zhu Yifeng | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China | zhuyifeng@nbu.edu.cn | | Dai Meixia | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China | | | Lin Xia | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China | | | Zhou Chengxu | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China | | | Yan Xiaojun | Key Laboratory of Applied Marine Biotechnology, School of Marine Science, Ningbo University, Ningbo 315832, China | yanxiaojun@nbu.edu.cn |
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| 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 meso-zooplankton (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. |
| 中文摘要: |
| 于2011年在象山港国华电厂附近海域，使用浮游生物Ⅰ型网（网目505 μm）、Ⅱ型网（网目160 μm）、Ⅲ型网（网目77 μm）进行10站位的浮游动物季节性采样。我们测量了浮游动物的全体长，并将其分为7个粒径级，以期探明电厂温排水增温对浮游动物群落粒径结构的影响。浮游动物全体长范围为93.7—40 074.7 μm。中型浮游动物（200—2 000 μm）在空间分布上很少受到温排水的影响，而大型（2 000—10 000 μm）和巨型（>10 000 μm）浮游动物有明显迁离电厂排水口的趋势。这导致电厂附近的浮游动物群落趋于小型化且生物多样性降低。此外，我们比较分析了三种网目采集的浮游动物群落差异，结果表明：I网的浮游动物物种丰富度、丰度、均匀度指数和香农多样性指数均显著低于II网和III网。其中，III网的浮游动物平均丰度最高，为（27 690.0 ± 1 633.7）ind. m-3，II网次之，为（9 531.1 ± 1 079.5）ind. m-3，I网最低，为（494.4 ± 104.7）ind. m-3。相似性分析（ANOSIM）和相似性百分比分析（SIMPER）结果显示，造成三种网目浮游动物群落差异的主要判别种为小型浮游动物和浮游动物早期发育阶段。本研究首次使用III网调查象山港国华电厂附近海域的浮游动物。III网中存在大量长腹剑水蚤属（Oithona），其丰度比II网大一个数量级，而I网遗漏了所有的长腹剑水蚤属。以上结果均表明为了准确量化滨海电厂附近海域的浮游动物群落，调查时使用小型甚至多种采样网型更具代表性。 |
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