电厂增温对中小型浮游动物群落结构的影响

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Abstract

To explore whether temperature increase would lead to miniaturization of zooplankton in thermal discharge seawaters near the power plant, samples of zooplankton were collected by the type III net with mesh size of 77μm and data was analyzed. In total 75species (including pelagic larvae, eggs and fish larva) were identified with 18dominant species. The annual average abundance was up to 27690.0ind/m³. These communities were mainly composed of meso-and micro-copepods and pelagic larvae, meanwhile dominanted by meso-and micro-zooplankton with a body length <1000μm. Among them, microzooplankton with a length<500μm had the highest abundance in each month and section, its average accounted for over 58.2% of total abundance. The average of zooplankton with a body length of 500~1000μm accounted for over 34.8%. Zooplankton with a body length >1000μm only accounted for 7%. Analysis of similarity (ANOSIM) showed that community structures among seasons were significant different (P<0.05), while among sections were not significant different. Similarity percentage (SIMPER) analysis found the most important discriminating species causing seasonal differences were Oithona similis, Oikopleura dioica and Difflugia sp., etc. Besides, macrozooplankton (>2000μm) were all away from D02section driven by thermal seawater, major larval groups (copepod nauplii and Copepodites) were almost unaffected evenly distributed in the warming seawater. Moreover, a large number of microzooplankton, such as Difflugia sp., Oithona brevicornis and Oithona fallax gathered to the outfall, resulting in the highest abundance (35704.1ind/m³) at D02section. Diversity analysis showed that significant linear regression relationship existed between water temperature increment and the Shannon index (H'), Pielou evenness (J'), Simpson index (D') of zooplankton (P<0.05), however the relationship between water temperature increment and species number was not significant (P>0.05). Based on slope of regression equation, H' would decrease by 5.4%, J' by 5.0%, D' by 3.8% and S by 2.9% when increasing the temperature by 1℃.

Key words： Xiangshan Bay zooplankton miniaturization temperature increment diversity

Received: 18 July 2019

PACS:	X835
	Q178.1

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	ZHANG Rui
	ZHU Yi-feng
	ZHAO Sheng-nan
	GUO Ya-jun
	LIN Xia

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ZHANG Rui,ZHU Yi-feng,ZHAO Sheng-nan等. Effects of temperature increase on meso-and micro-zooplankton community in thermal discharge seawaters near Guohua Power Plant[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(2): 839-850.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I2/839

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