Bacterivory by tropical copepod nauplii: extent and possible significance
Bacterivory by tropical copepod nauplii: extent and possible significance
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DOI：
10.3354/ame009165
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发表时间：
1995-08
影响因子：
1.4
通讯作者：
J. Roff;J. T. Turner;M. Webber;R. Hopcroft
中科院分区：
文献类型：
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作者：
J. Roff;J. T. Turner;M. Webber;R. Hopcroft
桡足类无节幼体可能是“微生物”和“经典”远洋海洋食物网之间的重要中介。在对西印度群岛牙买加外海富营养化港口到贫营养化海洋沃茨的营养梯度沿着浮游食物网的研究中，我们用荧光标记细菌（FLB）对11种典型桡足类无节幼体（n = 176）进行了噬菌性研究，其体积为0.7 μ m3，浓度为1.5 - 2.5 × 10 6 cells ml-1。7个分类群持续摄入FLB：利耶博螨，副哲水蚤属，Temora stylifera，T. turbinata，Oncaea spp.，Undinula vulgaris，Oithona spp.; 4个分类群始终没有：绒毛刺水蚤，黄哲水蚤属，Euchaeta marina和Corycaeus spp.这些数据，并观察到无节幼体蜕皮和生长速率解偶联叶绿素a浓度在任何大小的部分在0.09至4.7毫克m-3的范围内，表明无节幼体没有食物限制，即使在海洋沃茨。计算表明，海洋无节幼体的日常食物需求可以从细菌和微微浮游生物的饮食中得到满足，但不能从纳米和净浮游植物的饮食中得到满足。海洋沃茨中无节幼体的产量至少是桡足类产量的50 - 60%;因此，似乎桡足类无节幼体在海洋沃茨中的生态重要性被大大低估了。
Copepod nauplii may be an important intermediary between the 'microbial' and 'classical' pelagic marine food webs. In studies of planktonic food webs, along a trophic gradient from eutrophic harbour through coastal to oligotrophic oceanic waters off Jamaica, West Indies, we investigated bacterivory by nauplii of 11 representative copepod taxa (n = 176 total nauplii) using fluorescently labelled bacteria (FLB) of 0.7 μm 3 volume at concentrations of 1.5 to 2.5 x 10 6 cells ml -1 . Seven taxa consistently ingested FLB: Acartia liljeborgii, Paracalanus spp., Temora stylifera, T. turbinata, Oncaea spp., Undinula vulgaris, Oithona spp.; 4 taxa consistently did not: Centropages velificatus, Clausocalanus spp., Euchaeta marina, and Corycaeus spp. These data, and the observations that naupliar moulting and growth rates were uncoupled from chlorophyll a concentrations in any size fraction over the range 0.09 to 4.7 mg m -3 , suggest that nauplii are not food limited even in oceanic waters. Calculations indicate that daily food requirements of oceanic nauplii can be met from a diet of bacteria and picoplankton, but not from a diet of nano- and net-phytoplankton. Naupliar production in oceanic waters is at least 50 to 60 % of copepodite production; it appears therefore that the ecological importance of copepod nauplii in oceanic waters has been greatly underestimated.