悬浮物对三亚珊瑚礁区浮游动物群落结构及其摄食的影响

doi:10.11978/2022132

Abstract

Abstract:

With the intensification of human activities, the suspended solids imported into the nearshore coral reef area are increasing, which will not only affect the physiology of coral but also affect the basic biological production process of the coral reef ecosystem. To understand the impact of suspended solids on the species composition and feeding of zooplankton, the impact of suspended solids fluctuation on zooplankton community structure was analyzed by a diurnal observation in a typical coastal reef area of Sanya in April 2015, and the feeding response of the dominant species was studied by molecular method combined with laboratory experiments. The results showed that the phytoplankton biomass (chlorophyll a concentration) in these two stations was low with a significant diurnal fluctuation. The concentration of suspended solids and chlorophyll a in the W4 station are higher than those of the W5 station, but the proportion of organic particulate matter in the suspended solids of the W5 (73.69%) station is higher than that of W4 (46.09%). The species diversity and abundance of zooplankton in the W5 station are higher than that in the W4 station. Dietary analysis shows that the copepods in these two stations are mainly fed on organic detritus from metazoans. The proportion of phytoplankton in the diet of copepods in the W4 station is also relatively high, while copepods in the W5 station also eat some microzooplankton. In the feeding experiment, the high concentration of suspended particles significantly improved the filtration rate and ingestion rate of Acartia erythraea, but its dominant food item changed from phytoplankton to terrestrial plant detritus, indicating that the high content of suspended particles in the concentrated seawater limited the feeding choice of copepods and made them eat more organic detritus as a compensatory food source. The results show that high suspended solids concentration will affect the feeding choice of zooplankton, but the high proportion of organic detritus in suspended solids can provide an important supplementary food source for zooplankton and support its maintenance of high biomass.

Key words: zooplankton, suspended solid, community structure, diet diversity, Sanya Bay

HU Simin, ZHOU Tiancheng, ZHANG Chen, LIU Sheng, LI Tao, HUANG Hui. Effect of suspended solids on zooplankton community and their feeding selectivity in the Sanya coral waters[J].Journal of Tropical Oceanography, 2024, 43(3): 122-130.

Figures/Tables 8

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站位	经纬度	水深/m	分布区域	调查日期
W4	18°13′N, 109°28′E	7	礁区上方	04-18
W5	18°12′N, 109°25′E	15	礁区边缘	04-17

样品号	种类数	有效克隆数	香农-威纳指数	Chao1指数^a	杂食指数	食谱宽度
W4	13	31	1.791	28	0.76	3.28
W5	10	26	1.881	31	0.8	5.24

处理组	实验前细胞丰度/(×10⁴cells∙L^-1)	实验后细胞丰度/(×10³cells∙L^-1)	桡足类个体数	培养时间	滤水率/ (mL∙ind.^-1∙h^-1)	摄食率/ (cells∙ind.^-1∙h^-1)
SW	1.04	3.21±0.01	50	4h	0.65±0.03	3.98±0.01
SWC	4.16	1.56±0.07	50	4h	1.64±0.04	20.02±0.07

Effect of suspended solids on zooplankton community and their feeding selectivity in the Sanya coral waters

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