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Hu Simin,Li Tao,Liu Sheng,Huang Hui. 2020. Dietary separation between co-occurring copepods in a food-limited tropical coral reef of the Sanya Bay. Acta Oceanologica Sinica, 39(4):65-72
Dietary separation between co-occurring copepods in a food-limited tropical coral reef of the Sanya Bay
三亚湾食物资源限制的珊瑚礁区桡足类的食物分化
Received:February 19, 2019  
DOI:10.1007/s13131-020-1583-3
Key words:copepod  food partitioning  Sanya Bay  coral reef ecosystem
中文关键词:  桡足类  食物分化  三亚湾  珊瑚礁生态系统
基金项目: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.
Author NameAffiliationE-mail
Hu Simin Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 
 
Li Tao Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China 
litao@scsio.ac.cn 
Liu Sheng Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China 
shliu@scsio.ac.cn 
Huang Hui Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China 
 
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Abstract:
      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 18S ribosomal gene. Various prey organisms were uncovered, including dinoflagellate, diatom, green algae and plant, protozoa and metazoan. All these spatially co-existing 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.
中文摘要:
      食物分化策略对自然环境中生存于同一区域的桡足类非常重要,可保证它们获取所需的物质资源进而维持种群的稳定。本研究中,用基于PCR的分子生物学方法分析了三亚珊瑚礁区共存的6种桡足类的现场食物组成。结果显示,桡足类的食物种类非常丰富,包含甲藻、硅藻、绿藻、陆生植物、原生动物和后生动物。6种桡足类食物多样性差异较大,食物谱宽度指数(B)变化范围为1.00~10.68,最低值出现在采自早上的锥形宽水蚤(Temora turbinate),而最高值为采自晚上的椭形长足水蚤(Calanopia elliptica)。但不同桡足类种类间的食物重叠度很低,重叠指数(O)平均值仅为0.09,即使是采自同一时间点的桡足类也摄食不同的食物,早上的桡足类之间没有食物重叠,而中午和晚上的桡足类食物重叠度指数变化范围仅为0.04~0.07。其中,亚强次真哲水蚤(Subeucalanus subcrassus)是早中晚均出现的优势种,通过早晚偏肉食性中午偏植食性的摄食节律避免了与其他桡足类的食物竞争。大部分桡足类都摄食了水体中优势浮游植物以外的其他食物类型,说明在食物资源限制的环境中,桡足类可通过扩展食物范围更好地生存。桡足类的这种现场食物分化可能是在三亚近岸环境中维持种群稳定和繁衍的重要生存策略。
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