Biomass distribution in marine planktonic communities
Biomass distribution in marine planktonic communities
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DOI：
10.4319/lo.1997.42.6.1353
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发表时间：
1997-09-01
影响因子：
4.5
通讯作者：
Duarte, CM
中科院分区：
文献类型：
--
作者：
Gasol, JM;del Giorgio, PA;Duarte, CM
从真光层的初级生产力和碳输出的模式表明，浮游异养生物群落生物量的相对贡献应下降沿着梯度的浮游植物生物量和初级生产力。在这里，我们使用了广泛的文献数据调查，以测试的假设，总异养（细菌+原生动物+中型浮游动物）的生物量的比例，总自养生物量（H：A比）是不是恒定的海洋浮游生物群落，而是趋于下降，增加浮游植物生物量和初级生产。我们的研究结果表明，非生产性地区的浮游生物的特点是非常高的相对异养生物量导致倒置的生物量金字塔，而生产性地区的浮游生物的特点是由一个较小的贡献异养生物群落生物量和一个正常的生物量金字塔与广泛的自养基地。此外，对于给定的自养生物量，公海社区比沿海社区支持上层的异养生物量要多得多。群落生物量结构的这些差异可以用浮游植物生产的生物量特定速率的变化来解释，这种变化似乎发生在从超贫营养到富营养的海洋区域，但其他因素也可能产生这些差异。所描述的模式表明，从消费者控制初级生产和浮游植物生物量在公海的资源控制上升流和沿海地区的一个相当系统的转变。
Patterns in primary production and carbon export from the euphotic zone suggest that the relative contribution of planktonic heterotrophs to community biomass should decline along gradients of phytoplankton biomass and primary production. Here, we use an extensive literature data survey to test the hypothesis that the ratio of total heterotrophic (bacteria + protozoa + mesozooplankton) biomass to total autotrophic biomass (H:A ratio) is not constant in marine plankton communities but rather tends to decline with increasing phytoplankton biomass and primary production. Our results show that the plankton of unproductive regions are characterized by very high relative heterotrophic biomasses resulting in inverted biomass pyramids, whereas the plankton of productive areas are characterized by a smaller contribution of heterotrophs to community biomass and a normal biomass pyramid with a broad autotrophic base. Moreover, open-ocean communities support significantly more heterotrophic biomass in the upper layers than do coastal communities for a given autotrophic biomass. These differences in the biomass structure of the community could be explained by the changes in the biomass-specific rates of phytoplankton production that seem to occur from ultraoligotrophic to eutrophic marine regions, but other factors could also generate them. The patterns described suggest a rather systematic shift from consumer control of primary production and phytoplankton biomass in open ocean to resource control in upwelling and coastal areas.