Zooplankton Community Response to Seasonal Hypoxia: A Test of Three Hypotheses
Zooplankton Community Response to Seasonal Hypoxia: A Test of Three Hypotheses
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DOI：
10.3390/d12010021
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发表时间：
2020-01-01
期刊：
影响因子：
2.4
通讯作者：
Herrmann, BethElLee
中科院分区：
文献类型：
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作者：
Keister, Julie E.;Winans, Amanda K.;Herrmann, BethElLee
在过去的几十年里，关于浮游动物群落对海岸缺氧的反应，文献中提出了几种假说。我们探讨了其中三个，侧重于浮游动物的组成或生物量是如何受到季节性缺氧的影响，使用的数据收集了两个夏天在胡德运河，一个季节性缺氧的子盆地的普吉湾，华盛顿。我们进行了水文剖面和浮游动物网拖在四个站，从南部的一个地区，每年经历中度缺氧，在北部的一个地区，氧气仍然高于缺氧水平。测试的具体假设是，低氧导致：（1）相对于甲壳类浮游动物，胶质的优势增加，（2）相对于哲水蚤桡足类，剑水蚤桡足类的优势增加，和（3）总体上减少浮游动物丰度和生物量在缺氧的网站相比，氧气水平高。此外，我们还研究了缺氧是否会降低群落结构的时间稳定性。我们发现的证据转向更多的凝胶状浮游动物和较低的总浮游动物丰度和生物量在缺氧的网站，但没有明显增加的优势，剑水蚤相对哲水蚤桡足类。我们还发现，在最缺氧的网站，在社区结构的最低方差，与我们的预测。缺氧可以从根本上改变海洋生态系统，但影响因系统而异。
Several hypotheses of how zooplankton communities respond to coastal hypoxia have been put forward in the literature over the past few decades. We explored three of those that are focused on how zooplankton composition or biomass is affected by seasonal hypoxia using data collected over two summers in Hood Canal, a seasonally-hypoxic sub-basin of Puget Sound, Washington. We conducted hydrographic profiles and zooplankton net tows at four stations, from a region in the south that annually experiences moderate hypoxia to a region in the north where oxygen remains above hypoxic levels. The specific hypotheses tested were that low oxygen leads to: (1) increased dominance of gelatinous relative to crustacean zooplankton, (2) increased dominance of cyclopoid copepods relative to calanoid copepods, and (3) overall decreased zooplankton abundance and biomass at hypoxic sites compared to where oxygen levels are high. Additionally, we examined whether the temporal stability of community structure was decreased by hypoxia. We found evidence of a shift toward more gelatinous zooplankton and lower total zooplankton abundance and biomass at hypoxic sites, but no clear increase in the dominance of cyclopoid relative to calanoid copepods. We also found the lowest variance in community structure at the most hypoxic site, in contrast to our prediction. Hypoxia can fundamentally alter marine ecosystems, but the impacts differ among systems.