Biodiversity and ecosystem functioning in coastal lagoons: Does microbial diversity play any role?
Biodiversity and ecosystem functioning in coastal lagoons: Does microbial diversity play any role?
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DOI：
10.1016/j.ecss.2007.02.030
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发表时间：
2007-10-01
影响因子：
2.8
通讯作者：
Pusceddu, Antonio
中科院分区：
文献类型：
--
作者：
Danovaro, Roberto;Pusceddu, Antonio
虽然原核生物体积小，但它们是水生生态系统中重要的生物量组成部分，并在生物地球化学过程中发挥重要作用。一般认为原核生物对物质和能量通量的相对重要性在低生产力（贫营养）生态系统中最大化，在高生产力（富营养）生态系统中减少。泻湖和沿海生态系统极其活跃，通常生产力很高，并以大型生物（大型动物和大型植物）为主。因此，它们的功能特征通常是从“宏观”的角度进行评估的。然而，一个高效的生态系统功能，快速的营养循环，高生产力，低C积累和缺乏缺氧/营养不良的危机，密切依赖于微生物和大型微生物之间的相互作用。在这里，我们试图将原核生物的生物多样性（基因型丰富度，使用指纹技术，ARISA）和生态系统功能（使用一系列参数，包括小型底栖生物量，原核生物C生产和有机物周转率）在不同的地中海泻湖系统。泻湖之间的差异显着与其他所有变量。虽然没有观察到泻湖的环境特征和细菌多样性之间的关系，后者是显着的，正相关的泻湖的功能和效率。泻湖微生物多样性和功能之间的联系的调查仍处于起步阶段，但这些初步结果表明，更好地了解原核生物多样性对生态系统的功能和效率的作用，可以打开新的视角，这些高产和脆弱的生态系统的保护和管理。(c)2007爱思唯尔有限公司保留所有权利。
Although prokaryotes are small in size, they are a significant biomass component in aquatic ecosystems and play a major role in biogeochemical processes. It is generally assumed that the relative importance of prokaryotes to material and energy fluxes is maximized in low-productivity (oligotrophic) ecosystems and decreases in high-productivity (eutrophic) ecosystems. Lagoon and coastal ecosystems are extremely dynamic, typically highly productive and dominated by macro-size organisms (both macrofauna and macrophytes). As such, their functional characteristics are typically evaluated from a "macrobial" perspective. An efficient ecosystem functioning, with fast nutrient cycling, high productivity, low C accumulation and lack of hypoxic/dystrophic crises is, however, intimately dependent on the interaction between microbial and macrobial organisms. We make here an attempt to relate prokaryote biodiversity (genotype richness, using fingerprinting techniques, ARISA) and ecosystem functioning (using a series of parameters including meiofaunal biomass, prokaryote C production and organic matter turnover rates) in different Mediterranean lagoon systems. The lagoons differed significantly with each other for all the variables. While no relationships were observed between the environmental characteristics of the lagoons and the bacterial diversity, the latter was significantly and positively correlated with the functioning and efficiency of the lagoons. The investigation of the links between microbial diversity and functioning in lagoons is still at its infancy, but these preliminary results suggest that a better understanding of the role of prokaryote diversity on ecosystem functioning and efficiency could open new perspectives for the conservation and management of these highly productive and vulnerable ecosystems. (c) 2007 Elsevier Ltd. All rights reserved.