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首页> 外文期刊>Estuarine Coastal and Shelf Science >The exergy of a phase shift: Ecosystem functioning loss in seagrass meadows of the Mediterranean Sea
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The exergy of a phase shift: Ecosystem functioning loss in seagrass meadows of the Mediterranean Sea

机译：相移的火用：地中海海草草甸的生态系统功能丧失

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Sustained functioning of ecosystems is predicted to depend upon the maintenance of their biodiversity, structure and integrity. The large consensus achieved in this regard, however, faces to the objective difficulty of finding appropriate metrics to measure ecosystem functioning. Here, we aim at evaluating functional consequence of the phase shift occurring in meadows of the Mediterranean seagrass Posidonia oceanica, a priority habitat that is undergoing regression in many coastal areas due to multiple human pressures. Structural degradation of the P. oceanica ecosystem, consequent to increasing coastal exploitation and climate change, may result in the progressive replacement of this seagrass by opportunistic macrophytes, either native or alien. Reviewing published information and our personal records, we measured changes in biological habitat provisioning, species richness and biomass associated to each of the alternative states characterizing the phase shift. Then, ecosystem functioning was assessed by computing the exergy associated to each state, exergy being a state variable that measures the ecosystem capacity to produce work. Phase shift was consistently shown to imply loss in habitat provision, species richness, and biomass; structural and compositional loss was parallelled by a reduction of exergy content, thus providing for the first time an objective and integrative measure of the loss of ecosystem functioning following the degradation of healthy seagrass meadows. (C) 2014 Elsevier Ltd. All rights reserved.
机译：预计生态系统的持续功能取决于其生物多样性，结构和完整性的维持。但是，在这方面达成的广泛共识面临着寻找合适指标来衡量生态系统功能的客观困难。在这里，我们旨在评估在地中海海草波塞冬海洋中的草地上发生相移的功能后果，该海草是由于多种人类压力而在许多沿海地区正在退化的优先生境。由于沿海开发和气候变化的增加，海洋体育生态系统的结构退化可能导致该海草逐渐被原生或外来的机会性大型植物所替代。回顾已发布的信息和我们的个人记录，我们测量了生物栖息地供应，物种丰富度和与表征相移的每个其他状态相关的生物量的变化。然后，通过计算与每个州相关的火用度来评估生态系统功能，火用度是衡量生态系统生产功能的状态变量。一贯表明相移暗示着栖息地供应，物种丰富度和生物量的损失。结构和组成的丧失与火用含量的降低平行，因此首次提供了客观和综合的方法来衡量健康海草草甸退化后生态系统功能的丧失。 （C）2014 Elsevier Ltd.保留所有权利。

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