Dietary separation between co-occurring copepods in a food-limited tropical coral reef of the Sanya Bay  

作　　者：Simin Hu Tao Li Sheng Liu Hui Huang 

机构地区：[1]Key Laboratory of Tropical Marine Bio-Resources and Ecology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]Guangdong Provincial Key Laboratory of Applied Marine Biology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [3]Tropical Marine Biological Research Station in Hainan,Chinese Academy of Sciences,Sanya 572000,China

出　　处：《Acta Oceanologica Sinica》2020年第4期65-72,共8页海洋学报（英文版）

基　　金：The Strategic Priority Research Program of Chinese Academy of Sciences under contract No.XDA13020102;the National Key Research and Development Program of China under contract No.2016YFC0502800;the National Natural Science Foundation of China under contract No.41806188;the Science and Technology Planning Project of Guangdong Province,China under contract No.2017B030314052

摘　　要：Food differentiation among coexistent species in the field is important strategy for copepods to acquire materials and maintain population stabilization.In situ diet analysis of co-occurring six copepod species in coral waters of the Sanya Bay was conducted using a PCR protocol based on 18 S ribosomal gene.Various prey organisms were uncovered,including dinoflagellate,diatom,green algae and plant,protozoa and metazoan.All these spatially coexisting six species showed different dietary diversity,with the food niche breadth(B)ranging from 1.00(Temora turbinate in morning)to 10.68(Calanopia elliptica in night).While food overlap between all these copepods were low,with the average value of the diet niche overlap index being approximately 0.09.Even temporally co-existing species sampled from the same time point fed on different groups of prey items with the food overlap index of 0.04 to 0.07 in midday and night but 0 in morning.As the most important dominant copepod in the Sanya Bay,Subeucalanus subcrassus seems to be capable to regulate its feeding,by exhibiting a rhythm of herbivorous feeding in midday and carnivorous feeding in morning and night,to better coordinate with other competitors for utilization of food resources.For most copepods,none of the prey items belonged to the dominant phytoplankton in the ambient water,indicating that copepod can better their survival by widening the choice of potential food resources in food limited environment.The dietary separation observed here might be important strategy for copepod to maintain population stabilization and thriving in the Sanya coastal waters.

关 键 词：copepod food partitioning Sanya Bay coral reef ecosystem 

分 类 号：Q958[生物学—动物学]