Spatial heterogeneity of mesozooplankton along the tropical coastal waters
Spatial heterogeneity of mesozooplankton along the tropical coastal waters
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DOI：
10.1016/j.csr.2020.104193
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发表时间：
2020-12-13
影响因子：
2.3
通讯作者：
Ramesh, R.
中科院分区：
文献类型：
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作者：
Anandavelu, I.;Robin, R. S.;Ramesh, R.
2014年夏季，在西海岸的贝瑙利姆(Goa)和东海岸的Thoothukudi(泰米尔纳德邦)之间的印度海岸(类似于1100公里长)进行了一项调查，以评估中浮游动物群落结构。浮游动物群落以全浮游类型为主，占浮游动物总数的93.7%，混栖浮游类型占6.3%。浮游动物总体上以桡足类为主，约占69%。浮游动物的丰富度主要由18科48种桡足类组成，其中小型桡足类属贡献较大。Bstiolina、Parvocalanus、Acrocalanus、Corycaeus、Oncaea和Oithona。中浮游动物和桡足类总密度在80个/d之间。M(-3)到804 ind.M(-3)和28ind.M(-3)到570 ind。M(-3)。东海岸记录到的对浮游动物生物量有显著贡献的枝角类(Pensilia avirostris和Evadne tersterina)的丰度明显高于桡足类(r(2)=0.984，p<；0.01)。RDA分析结果表明，海表面温度(SST)、营养盐(SiO4和NO2)、溶解氧(DO)和总悬浮物(TSM)是季风前期群落结构的重要环境变量(p<；0.05；999蒙特卡罗排列)。西海岸的桡足类多样性指数(H‘)和优势度指数(Lambda)都较高，表明河流流入的高营养和有机输入与复杂的环境特征相结合的影响。叶绿素a与桡足类多样性之间的负相关关系(H‘：R=-0.488，p<；0.01)证实了放牧压力在这些沿海水域的重要性。相反，叶绿素a与桡足类优势度呈正相关(波长：r=0.434，p<；0.05)，表明桡足类不捕食浮游植物。要进一步确定沿海水域群落结构的这种变异性，需要在较低的分类水平上进行长期监测。
A survey along the coast of India (similar to 1100 km stretch) between Benaulim (Goa) in the west coast and Thoothukudi (Tamil Nadu) in the east coast was conducted during summer 2014, to evaluate the mesozooplankton community structure. Zooplankton community was dominated by holoplanktonic forms representing 93.7% of the total zooplankton, while meroplanktonic forms constituted 6.3%. Zooplankton was generally dominated by copepods which contributed about 69%. In total, forty-eight species of copepods belonging to eighteen families dominated the zooplankton abundance, with a significant contribution of small-sized copepod genera, viz. Bestiolina, Parvocalanus, Acrocalanus, Corycaeus, Oncaea and Oithona. Total mesozooplankton and copepod density ranged from 80 ind. m(-3) to 804 ind. m(-3) and 28 ind. m(-3) to 570 ind. m(-3), respectively. Considerably higher abundance of cladocerans (Penilia avirostris and Evadne tergestina) with a significant contribution to zooplankton biomass (r(2) = 0.984, p < 0.01) compared to copepods was recorded along the east coast. The results of RDA analysis revealed that the sea surface temperature (SST), nutrients (SiO4 and NO2), dissolved oxygen (DO) and total suspended matter (TSM) were significant environmental variables (p < 0.05; 999 Monte Carlo permutations) associated with the community structure during pre-monsoon period. Both copepod diversity (H') and dominance (lambda) index were higher along the west coast, suggesting the influence of high nutrient and organic input from riverine influx coupled with complex environmental features. The inverse relationship between chlorophyll-a and copepod diversity (H': r = -0.488, p < 0.01) substantiated the importance of grazing pressure in these coastal waters. In contrast, a positive relationship between chlorophyll-a and copepod dominance (lambda: r = 0.434, p < 0.05) indicated that copepods abstained from grazing on phytoplankton. Further characterization of this variability in community structure along the coastal waters requires long-term monitoring at a lower taxonomic level.