Thermodynamic oriented ecological indicators: Application of Eco-Exergy and Specific Eco-Exergy in capturing environmental changes between disturbed and non-disturbed tropical reservoirs
Thermodynamic oriented ecological indicators: Application of Eco-Exergy and Specific Eco-Exergy in capturing environmental changes between disturbed and non-disturbed tropical reservoirs
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DOI：
10.1016/j.ecolind.2012.08.002
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发表时间：
2013
影响因子：
6.9
通讯作者：
J. Molozzi;F. Salas;M. Callisto;João Carlos Marques
中科院分区：
文献类型：
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作者：
J. Molozzi;F. Salas;M. Callisto;João Carlos Marques
水生态系统生态质量的有效评价已成为世界各国研究者和环境管理者的重要课题。热力学为导向的生态指标在环境评估和管理的潜力进行了测试，并与位于巴西米纳斯吉拉斯州的帕拉奥佩巴河流域的三个热带水库的多样性措施进行了比较。我们计算了基于生态（火用）的指数（生态（火用）和特定的生态（火用））和Margalef和香农-维纳指数，并测试了不同程度的人为干扰的水库底栖生物群落变化的响应差异。根据生物描述符（大型底栖动物生物量、组成和丰度）估算了指数，并根据非生物描述符（pH值、电导率、透明度、浊度、营养物浓度、溶解氧、叶绿素a和总溶解固体）分析了指数值。Margalef指数在参考点和受影响点之间显示出显著差异，前一种类型的点的值最高（伪F2.719= 24，506，p=0.001），而Shannon-Wiener指数值在参考点和受影响点之间没有显著差异。生态（火用）值显着较高，位于更多的干扰网站（伪F2.719=80.319，p=0.001），但具体的生态（火用）干扰和非干扰网站之间没有表现出真正的显着差异，虽然值较高的非干扰网站类型。这可能是因为机会主义的宽容的物种在污染的网站，目前高的生物量值，因为生态火用值可能会有所不同，由于生物量或信息的变化。另一方面，干扰和非干扰网站之间的信息差异更为微妙（虽然物种的数量较高，在干扰较少的网站，它没有明确反映在特定的生态火用值）。我们的研究结果表明，热力学为导向的指标可以捕捉连贯的结构变化的生物群落，突出其指标的潜力，用于评估生态条件/高度修改的水体，如水库的完整性。
Effective assessment of ecological quality in aquatic ecosystems has become an important issue for researchers and environmental managers worldwide. The potential of thermodynamic oriented ecological indicators in environmental assessment and management was tested and compared with diversity measures in three tropical reservoirs located in the basin of the Paraopeba River, Minas Gerais State-Brazil. We computed Eco-Exergy based indices (Eco-Exergy and Specific Eco-Exergy) and the Margalef and Shannon–Wiener indices and tested differences in their responses to change in benthic communities across reservoirs characterised by different degrees of anthropogenic disturbance. Indices were estimated based on biotic descriptors (macrofauna biomass, composition, and abundance) and their values analysed against abiotic descriptors (pH, conductivity, transparency, turbidity, nutrients concentration, dissolved oxygen, chlorophyll a, and total dissolved solids). The Margalef index showed significant differences between reference and impacted sites, with the highest values in the former type of sites, (Pseudo F2.719=24,506, p=0.001), while the Shannon–Wiener index values showed no significant differences between reference and impacted sites. Eco-Exergy values were significantly higher at stations located in more disturbed sites (Pseudo F2.719=80.319, p=0.001), but Specific Eco-Exergy did not show really significant differences between disturbed and non-disturbed sites, although values were higher in the non-disturbed sites type. This might be explained by the fact that opportunistic tolerant species present high biomass values in polluted sites, since Eco-Exergy values may vary due to changes in biomass or information. On the other hand, differences in information between disturbed and non-disturbed sites were more subtle (although the number of species was higher in the less disturbed sites, it was not clearly reflected in Specific Eco-Exergy values). Our results suggest that thermodynamic oriented indicators can capture coherent structural changes in biological communities, highlighting its indicator potential for assessing the ecological condition/integrity of highly modified water bodies, such as reservoirs.