Community interactions dampen acidification effects in a coastal plankton system
Community interactions dampen acidification effects in a coastal plankton system
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群落相互作用抑制沿海浮游生物系统的酸化效应
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Winder
中科院分区：
文献类型：
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作者：
Dennis Rossoll;U. Sommer;M. Winder
由于大气中二氧化碳 (CO2) 的增加，海水化学性质发生变化，pH 值降低，正在影响海洋生物，特别是钙化物种。非钙化消费者的反应变化很大，主要是通过改变猎物的生化含量而引起的间接海洋酸化效应介导的，如单一物种和简单的 2 营养级系统所示。然而，可以预期，在单一物种层面观察到的间接二氧化碳影响会在生态系统层面通过物种丰富度和复杂的营养相互作用得到补偿。对于适应了 pCO2 强烈自然波动的沿海社区来说，二氧化碳的影响预计会进一步减弱，这是生产性沿海栖息地的典型特征。在这里，我们表明基尔峡湾的浮游生物群落能够耐受本世纪末预计的二氧化碳分压 (pCO2) 水平（<1400 µatm），并且在 4000 µatm 的极高值下仅观察到细微的差异。我们发现所有二氧化碳处理水平下的浮游植物和微型动物生物量、桡足类丰度和产蛋量相似。在最高 pCO2 处理下，化学计量的浮游植物食物质量差异极小，但远未对桡足类动物造成潜在限制。这些结果与仅包括单个物种的研究形成鲜明对比，这些研究观察到草食动物强烈的间接二氧化碳效应，并表明生物体对群落水平的生物反应的局限性。虽然沿海浮游生物群落对 pCO2 的大幅波动具有高度耐受性，但缺氧和海洋吸收 CO2 的增加会加剧酸化，并可能导致 pH 值变化超出沿海生物目前所经历的范围。
Changing seawater chemistry towards reduced pH as a result of increasing atmospheric carbon dioxide (CO2) is affecting oceanic organisms, particularly calcifying species. Responses of non-calcifying consumers are highly variable and mainly mediated through indirect ocean acidification effects induced by changing the biochemical content of their prey, as shown within single species and simple 2-trophic level systems. However, it can be expected that indirect CO2 impacts observed at the single species level are compensated at the ecosystem level by species richness and complex trophic interactions. A dampening of CO2-effects can be further expected for coastal communities adapted to strong natural fluctuations in pCO2, typical for productive coastal habitats. Here we show that a plankton community of the Kiel Fjord was tolerant to CO2 partial pressure (pCO2) levels projected for the end of this century (<1400 µatm), and only subtle differences were observed at the extremely high value of 4000 µatm. We found similar phyto- and microzooplankton biomass and copepod abundance and egg production across all CO2 treatment levels. Stoichiometric phytoplankton food quality was minimally different at the highest pCO2 treatment, but was far from being potentially limiting for copepods. These results are in contrast to studies that include only a single species, which observe strong indirect CO2 effects for herbivores and suggest limitations of biological responses at the level of organism to community. Although this coastal plankton community was highly tolerant to high fluctuations in pCO2, increase in hypoxia and CO2 uptake by the ocean can aggravate acidification and may lead to pH changes outside the range presently experienced by coastal organisms.
影响因子：
18.3
作者：
Lohbeck, Kai T.;Riebesell, Ulf;Reusch, Thorsten B. H.
通讯作者：
Reusch, Thorsten B. H.
影响因子：
4.9
作者：
Thomsen, J.;Gutowska, M. A.;Melzner, F.
通讯作者：
Melzner, F.