Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model
Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model
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DOI：
10.3354/meps07597
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发表时间：
2008-01-01
影响因子：
2.5
通讯作者：
Yamamura, Norio
中科院分区：
文献类型：
--
作者：
Miki, Takeshi;Yokokawa, Taichi;Yamamura, Norio
异养原核生物对有机物的处理调节海洋中的碳封存，从而影响全球气候。最近的研究已经开始阐明海洋原核生物的显着多样性，估计在单个当地栖息地中有超过 1000 个物种或系统型，在全球海洋中多达 200 万个。然而，这种原核生物多样性和其组成的空间异质性如何导致异养原核生物驱动的主要生物地球化学通量的区域变化仍不清楚。一种将元群落概念与海洋生物地球化学相结合的新理论模型表明，颗粒有机碳（POC）产量的增加会导致海洋表层POC再矿化效率的提高，从而影响向深水区的碳输出。这归因于当地原核生物群落组成因初级生产变化而发生的灵活变化，而元群落的高度多样性和原核生物向当地群落的适度迁移率促进了这一变化。通过将微生物群落的空间异质性与其瞬态动态联系起来，元群落概念将提高我们对海洋生物地球化学过程的区域变异性的理解。
Processing of organic matter by heterotrophic prokaryotes regulates carbon sequestration in the ocean, and thus influences the global climate. Recent studies have begun to elucidate the remarkable diversity of oceanic prokaryotes with estimates of >1000 species or phylotypes in a single local habitat and up to 2 million in the global ocean. However, how this prokaryotic diversity and spatial heterogeneity in their compositions contribute to regional variations in major biogeochemical fluxes driven by heterotrophic prokaryotes is still unclear. A new theoretical model integrating the metacommunity concept with oceanic biogeochemistry demonstrates that increased production of particulate organic carbon (POC) leads to increased efficiency of remineralization of POC in the surface ocean, affecting the carbon export to deep waters. This is attributed to flexible shifts in the local prokaryotic community composition in response to changes in primary production, which is facilitated by the high degree of diversity in the metacommunity and moderate immigration rates of prokaryotes into the local community. By linking the spatial heterogeneity of microbial communities to their transient dynamics, a metacommunity concept will improve our understanding of the regional variability of biogeochemical processes in the oceans.