Copepod grazing and its potential impact on the phytoplankton development in the Barents Sea
Copepod grazing and its potential impact on the phytoplankton development in the Barents Sea
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桡足类放牧及其对巴伦支海浮游植物发育的潜在影响
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
H. Skjoldal
中科院分区：
文献类型：
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作者：
U. Båmstedt;H. Eilertsen;K. Tande;D. Slagstad;H. Skjoldal
根据已发表和未发表的资料汇编的关于巴伦支海大型桡足类动物放牧的数据给出了广泛的放牧率范围。近似平均值表明，桡足类 V 和 VI 阶段的日配给量为 7-18%，而最早的桡足类阶段的值要高得多。研究表明，某一地区桡足类动物肠道饱满度的个体差异通常非常高，并且与食物丰度或发生深度的变化没有密切关系。夏季没有昼夜摄食节律，即使通过逐步线性回归分析将桡足类放牧与许多生物和非生物因素联系起来，许多变异性仍然无法解释。这表明桡足类的摄食行为、食物质量和摄食史都作为调节桡足类放牧的因素发挥着重要作用。对浮游植物演替的模型模拟，利用实验室确定的普氏褐藻和大型硅藻的孤立细胞和菌落的生长特征的文献数据表明，混合层的程度和浮游动物的选择性放牧是可能解释春季经常观察到的普氏褐藻菌落密集繁殖的重要因素。
Compiled data from published and unpublished sources on copepod grazing of the large-sized copepods in the Barents Sea give wide ranges in grazing rates. Approximate average values indicate daily rations of 7–18% for copepodite stages V and VI and considerably higher values for the earliest copepodite stages. It is demonstrated that individual variability in gut fullness of copepods from a given locality is typically very high and not closely related to variable food abundance or depth of occurrence. There is no diel feeding rhythm during the summer, and even when relating copepod grazing to a number of biotic and abiotic factors through stepwise linear regression analysis, much of the variability remains unexplained. It is suggested that feeding behaviour, food quality and feeding history of the copepods all play important roles as factors which regulate copepod grazing. Model simulations on the phytoplankton succession, using literature data on laboratory-determined growth characteristics for solitary cells and colonies of the prymnesiophyte Phaeocystis pouchetii and large diatoms, indicate that the extent of the mixed layer and selective grazing by zooplankton are important factors that may explain the occurrence of dense blooms of P. pouchetii colonies, frequently observed during the spring.