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Fish community-based measures of estuarine ecological quality and pressure-impact relationships

机译:基于鱼类群落的河口生态质量和压力影响关系的度量

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Community-based responses of fish fauna to anthropogenic pressures have been extensively used to assess the ecological quality of estuarine ecosystems. Several methodologies have been developed recently combining metrics reflecting community structure and function. A fish community facing significant environmental disturbances will be characterized by a simplified structure, with lower diversity and complexity. However, estuaries are naturally dynamic ecosystems exposed to numerous human pressures, making it difficult to distinguish between natural and anthropogenic-induced changes to the biological community. In the present work, the variability of several fish metrics was assessed in relation to different pressures in estuarine sites. The response of a multimetric index (Estuarine Fish Assessment Index) was also analysed. Overall, fish metrics and the multimetric index signalled anthropogenic stress, particularly environmental chemical pollution. The fish assemblage associated with this type of pressure was characterized by lower species diversity, lower number of functional guilds, lower abundance of marine migrants and of piscivorous individuals, and higher abundance of estuarine resident species. A decreased ecological quality status, based on the EFAI, was also determined for sites associated with this pressure group. Ultimately, the definition of each pressure groups favoured a stressor-specific analysis, evidencing pressure patterns and accounting for multiple factors in a highly dynamic environment.
机译:基于社区的鱼类动植物对人为压力的反应已被广泛用于评估河口生态系统的生态质量。最近开发了几种方法,这些方法结合了反映社区结构和功能的指标。面临严重环境干扰的鱼类群落的特点是结构简化,多样性和复杂性较低。但是,河口是自然动态的生态系统,承受着巨大的人类压力,因此很难区分自然界和人为诱发的生物群落变化。在目前的工作中,评估了几种鱼类指标的变化与河口站点不同压力的关系。还分析了多指标指标(鱼肉鱼类评估指标)的响应。总体而言,鱼类指标和多指标指标表明人为压力,特别是环境化学污染。与这种压力有关的鱼群的特征是物种多样性降低,功能行会数量减少,海洋移徙者和食鱼个体的丰度降低以及河口常住物种的丰度较高。还确定了基于EFAI的与该压力组相关的地点的生态质量状况有所下降。最终,每个压力组的定义都支持特定于压力源的分析,以证明压力模式并解释高度动态环境中的多个因素。

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