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预测的2100年海水pH值影响北极桡足类动物冰川哲水蚤幼体对摄食的代谢反应。

Seawater pH Predicted for the Year 2100 Affects the Metabolic Response to Feeding in Copepodites of the Arctic Copepod Calanus glacialis.

作者信息

Thor Peter, Bailey Allison, Halsband Claudia, Guscelli Ella, Gorokhova Elena, Fransson Agneta

机构信息

Norwegian Polar Institute, Fram Centre, Tromsø, Norway.

Akvaplan-niva, Fram Centre, Tromsø, Norway.

出版信息

PLoS One. 2016 Dec 19;11(12):e0168735. doi: 10.1371/journal.pone.0168735. eCollection 2016.

DOI:10.1371/journal.pone.0168735
PMID:27992579
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5167424/
Abstract

Widespread ocean acidification (OA) is transforming the chemistry of the global ocean, and the Arctic is recognised as a region where the earliest and strongest impacts of OA are expected. In the present study, metabolic effects of OA and its interaction with food availability was investigated in Calanus glacialis from the Kongsfjord, West Spitsbergen. We measured metabolic rates and RNA/DNA ratios (an indicator of biosynthesis) concurrently in fed and unfed individuals of copepodite stages CII-CIII and CV subjected to two different pH levels representative of present day and the "business as usual" IPCC scenario (RCP8.5) prediction for the year 2100. The copepods responded more strongly to changes in food level than to decreasing pH, both with respect to metabolic rate and RNA/DNA ratio. However, significant interactions between effects of pH and food level showed that effects of pH and food level act in synergy in copepodites of C. glacialis. While metabolic rates in copepodites stage CII-CIII increased by 78% as a response to food under present day conditions (high pH), the increase was 195% in CII-CIIIs kept at low pH-a 2.5 times greater increase. This interaction was absent for RNA/DNA, so the increase in metabolic rates were clearly not a reaction to changing biosynthesis at low pH per se but rather a reaction to increased metabolic costs per unit of biosynthesis. Interestingly, we did not observe this difference in costs of growth in stage CV. A 2.5 times increase in metabolic costs of growth will leave the copepodites with much less energy for growth. This may infer significant changes to the C. glacialis population during future OA.

摘要

广泛的海洋酸化正在改变全球海洋的化学性质,北极被认为是预计最早且最强烈受到海洋酸化影响的地区。在本研究中,我们对来自西斯匹次卑尔根群岛孔斯峡湾的冰川哲水蚤进行了海洋酸化及其与食物可利用性相互作用的代谢效应研究。我们同时测量了处于CII - CIII期和CV期的桡足幼体在进食和未进食状态下,分别处于代表当前状况以及政府间气候变化专门委员会(IPCC)“一切照旧”情景(RCP8.5)对2100年预测的两种不同pH水平时的代谢率和RNA/DNA比率(生物合成的一个指标)。桡足类动物对食物水平变化的反应比对pH降低的反应更为强烈,无论是在代谢率还是RNA/DNA比率方面。然而,pH和食物水平效应之间的显著相互作用表明,在冰川哲水蚤的桡足幼体中,pH和食物水平效应协同作用。在当前条件下(高pH),CII - CIII期桡足幼体的代谢率因食物而增加了78%,而在低pH条件下饲养的CII - CIII期桡足幼体中,这一增加幅度为195%,增长幅度高出2.5倍。RNA/DNA不存在这种相互作用,因此代谢率的增加显然不是对低pH下生物合成变化的反应,而是对每单位生物合成代谢成本增加的反应。有趣的是,我们在CV期没有观察到这种生长成本的差异。生长代谢成本增加2.5倍将使桡足幼体用于生长的能量大大减少。这可能预示着在未来海洋酸化期间,冰川哲水蚤种群将发生显著变化。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/7dff228192bb/pone.0168735.g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/98ffb2cf8bcc/pone.0168735.g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/2eac331a7245/pone.0168735.g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/6dc05410719b/pone.0168735.g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/c64ed06c8107/pone.0168735.g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/7dff228192bb/pone.0168735.g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/98ffb2cf8bcc/pone.0168735.g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/2eac331a7245/pone.0168735.g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/6dc05410719b/pone.0168735.g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/c64ed06c8107/pone.0168735.g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/683d/5167424/7dff228192bb/pone.0168735.g005.jpg

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本文引用的文献

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