摘要
于2001年6月对南黄海产卵场的主要饵料生物———中华哲水蚤的数量分布及摄食进行了研究。调查期间,中华哲水蚤是调查海区浮游动物的绝对优势种,在所有站位上均有分布,平均密度为244ind·m-3,数量密度最大值高达1555ind·m-3。中华哲水蚤的肠道色素含量平均为1.19ng·ind-1(0.21～4.14ng·ind-1),与水体中叶绿素a的最大浓度呈现一定的相关性。中华哲水蚤种群具有一定的昼夜摄食节律,夜间的肠道色素含量明显高于白天。在A和B站中华哲水蚤的个体摄食率分别为76.9ng·ind-1·d-1和39.6ng·ind-1·d-1,分别相当于体碳含量的7.5%和3.9%。除了饵料来源和摄食强度等因素之外,捕食压力以及环境温度对中华哲水蚤种群的分布和发展可能具有十分重要的影响。
The horizontal distribution and feeding activities of Calanus sinicus, the important food species for anchovy, were studied in the anchovy spawning ground in the Southern Yellow Sea in June, 2001. During the study period, C.sinicus was the most dominant species of zooplankton in the survey area and found at all sampling stations. Its mean density was 244 ind·m-3, with the highest value was 1555 ind·m-3. The gut pigment content of C.sinicus was on average 1.19 ng·ind-1, ranged from 0.21 to 4.14 ng·ind-1. There was a correlation between in situ gut pigment contents of C.sinicus and ambient maximum chlorophyll a concentration. The C.sinicus population exhibited a diet feeding periodicity, mean gut pigment contents were significantly higher at night than that during the daytime. Its individual ingestion rates on phytoplankton were 76.9 ng·ind-1·d-1 at Station A and 39.6 ng·ind-1·d-1 at Station B, which equal to 7.5% and 3.9% of body carbon, respectively. In addition to food resource and feeding activities, predation impact and ambient temperature were suggested to play an important role in C.sinicus population distribution and development.
出处
《水产学报》
CAS
CSCD
北大核心
2003年第B09期55-63,共9页
Journal of Fisheries of China
基金
国家重点基础研究规划项目(G1999043707)
国家自然科学青年基金资助项目(40106016)
关键词
中华哲水蚤
分布
摄食
鳀产卵场
南黄海
Calanus sinicus
distribution
feeding
anchovy spawning ground
the Southern Yellow Sea
