Grazing by the copepods Calanus helgolandicus and Acartia clausi on the protozooplankton community at station L4 in the Western English Channel
Grazing by the copepods Calanus helgolandicus and Acartia clausi on the protozooplankton community at station L4 in the Western English Channel
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DOI：
10.1093/plankt/fbp142
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发表时间：
2010-05-01
影响因子：
2.1
通讯作者：
Harris, Roger
中科院分区：
文献类型：
--
作者：
Fileman, Elaine;Petropavlovsky, Alexey;Harris, Roger
2002 - 2004年调查了英吉利海峡L4海域原生浮游动物（PZP）群落组成、丰度和生物量的季节变化，2002年5 - 8月调查了clausi和Calanus helgolandicus取食对浮游植物和PZP自然种群的重要性。海螺（Calanus helgolandicus）每天（-1）摄取1 ~ 12 μ g浮游植物碳（-1）（2 ~ 13%）；A. clausi每天摄入1 - 6 μ g C（20-166%的总碳）。对PZP猎物的清除率随食物浓度的增加呈线性增加，分别在120 ~ 304 mL / d（-1）和26 ~ 150 mL / d（-1）之间。从浮游植物和PZP中分别获得2-27%和2-17%的日摄食量。clausi Acartia日摄食量的22-161%来自浮游植物，3-44%来自PZP。黄颡鱼种群和黄颡鱼种群的日采食量占PZP总蓄积量的21%。C. helgolandicus和A. clausi均表现出对大型纤毛虫和异养鞭毛藻的选择性取食。我们的研究结果支持了这样的假设：当浮游植物群落以小细胞为主时，PZP在春季开花后的桡足类饮食中占很大比例。
Seasonal variation in community composition, abundance and biomass of protozooplankton (PZP) was investigated at L4 in the English Channel from 2002 to 2004 and the importance of feeding of Acartia clausi and Calanus helgolandicus on natural populations of phytoplankton and PZP was investigated between May and August, 2002. Calanus helgolandicus ingested between 1 and 12 mu g phytoplankton carbon ind.(-1) day(-1) (2-13% total body carbon); A. clausi ingested between 1 and 6 mu g C ind.(-1) day(-1) (20-166% total body carbon). Clearance rates on PZP prey increased linearly with increase in food concentration and ranged from 120 and 304 mL ind.(-1) day(-1) and between 26 and 150 mL ind.(-1) day(-1) for C. helgolandicus and A. clausi, respectively. Calanus helgolandicus obtained 2-27% of its daily ration as a percentage of body carbon from phytoplankton and 2-17% of its daily ration from PZP. Acartia clausi obtained 22-161% of its daily ration from phytoplankton and 3-44% daily ration from PZP. Calanus helgolandicus and A. clausi populations together grazed up to 21% of the total PZP standing stock daily. Both C. helgolandicus and A. clausi demonstrated selective feeding on large choreotrich ciliates and heterotrophc dinoflagellates. Our results support the hypothesis that PZP comprise a significant proportion of the copepod diet after the spring bloom when the phytoplankton community is dominated by small cells.