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首页> 外文期刊>Marine ecology progress series >Copepod feeding selectivity on microplankton, including the toxigenic diatoms Pseudo-nitzschia spp., in the coastal Pacific Northwest
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Copepod feeding selectivity on microplankton, including the toxigenic diatoms Pseudo-nitzschia spp., in the coastal Pacific Northwest

机译：pe足类对微浮游生物的选择性摄食，包括西北太平洋沿海地区的产毒硅藻假拟尼茨菌

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摘要

As part of the Pacific Northwest ECOHAB project, we measured clearance rates and feeding selectivity of calanoid copepods off the coast of Washington State, USA, during fall of 2003. We tested the hypothesis that copepods discriminate amongst prey, particularly against the toxic diatoms Pseudo-nitzschia spp. in natural assemblages from this highly productive, upwelling environment. Seven grazing experiments were conducted across and along the shelf using the copepods Calanus pacificus, Metridia pacifica, Acartia longiremis and a small community assemblage dominated by Acartia spp., with minor contributions from Pseudocalanus spp., Paracalanus spp. and Oithona spp. Three general patterns emerged from our experiments. First, all copepods, except A. longiremis in 1 experiment, showed neutral preference or discriminated against Pseudo-nitzschia, but preference did not appear related to cellular domoic acid concentrations. Second, the dominant prey biomass contributors in each experiment were cleared at low rates relative to other prey types. In most cases the dominants were the diatom Thalassiosira spp. or the autotrophic dinoflagellates Ceratium spp. and Prorocentrum spp. The third pattern was high preference for microzooplankton. High clearance on microzooplankton can result in trophic cascades, which were evident in our size-fractionated chlorophyll data. These patterns indicate that copepods could have both direct and indirect effects on the plankton community composition on the Washington coast. However, our estimates of total potential grazing suggest that copepod grazing impact on Pseudo-nitzschia populations is negligible.
机译：作为太平洋西北地区ECOHAB项目的一部分，我们在2003年秋季测量了美国华盛顿州沿海沿海地区的cal类co足类动物的清除率和进食选择性。我们检验了co足类动物在猎物之间进行区分的假设，尤其是针对有毒硅藻Pseudo-尼兹菌属在这种高产的上升流环境中以自然组合形式出现。在整个pe架上和沿架进行了七个放牧实验，这些the足类包括C，Me 、,、长car螨和一个以car螨为主导的小型群落，其中P假单胞菌，副cal属的贡献很小。和Oithona spp。从我们的实验中得出了三种一般模式。首先，除了1个实验中的长曲霉外，所有co足类动物均显示中性偏爱或对假性尼兹菌的歧视，但偏爱似乎与细胞中的二氢氰酸浓度无关。其次，相对于其他猎物类型，每个实验中占主导地位的猎物生物量贡献者清除率均较低。在大多数情况下，优势种是硅藻Thalassiosira spp。或自养的鞭毛藻类（Ceratium spp）。和Prorocentrum spp。第三种模式是微浮游动物的高度偏好。在微藻类浮游生物上的高清除率可导致营养级联反应，这在我们按大小分级的叶绿素数据中很明显。这些模式表明，pe足类动物可能对华盛顿海岸的浮游生物群落组成具有直接和间接的影响。但是，我们对潜在放牧总量的估计表明，co足类放牧对拟南芥种群的影响可以忽略不计。

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