Istituto di Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche, Venezia, Italy.
FEMS Microbiol Ecol. 2010 May;72(2):153-64. doi: 10.1111/j.1574-6941.2010.00839.x. Epub 2010 Jan 19.
The strength of the bacteria-phytoplankton coupling and the importance of the microbially mediated carbon fluxes have been investigated in a microtidal lagoon (Lagoon of Venice), with emphasis on the trophic variations, in a within-system perspective. The large trophic heterogeneity of the three stations considered corresponded to an elevated variability of phytoplankton biomass and production (from 0.1 up to 300 microg C L(-1) h(-1)), while bacteria standing stock and production (from 2 to 8 microg C L(-1) h(-1)) appeared, in comparison, to be much more constant. The relationships between bacteria and the phytoplankton community could not be related to the trophic state in a straightforward way; rather, some patterns common to the three stations could be evidenced. In particular, the two communities appeared to be clearly uncoupled, bacterial carbon demand (BCD) always exceeding dissolved primary production (DPP) and, mostly, also total primary production, independent of the station and the season considered. The occurrence of situations in which bacterial production was larger than primary production and the continuous prevalence of BCD over DPP implied that, quite independent of the trophic variability, sources of organic carbon other than phytoplankton production were necessary and available to sustain the bacterial metabolism in the Lagoon of Venice.
已在微潮汐泻湖（威尼斯泻湖）中研究了细菌-浮游植物耦合的强度和微生物介导的碳通量的重要性，重点是在系统内视角下的营养变化。考虑到三个站位的巨大营养异质性，浮游植物生物量和生产力（从 0.1 到 300 微克 C L(-1) h(-1)）的变化幅度很高，而细菌存量和生产力（从 2 到 8 微克 C L(-1) h(-1)）则相对稳定。细菌与浮游植物群落之间的关系不能直接与营养状态相关联，而是可以在三个站位中发现一些共同的模式。特别是，这两个群落似乎明显解耦，细菌碳需求（BCD）始终超过溶解初级生产力（DPP），并且在很大程度上也超过总初级生产力，而与站位和季节无关。细菌生产力大于初级生产力的情况时有发生，并且 BCD 持续超过 DPP，这意味着，相当独立于营养变化，除了浮游植物生产之外，其他有机碳源是维持威尼斯泻湖细菌代谢所必需的，并且是可用的。
