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Descripción
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| The New EFI+ is a multimetric index based on a predictive model that derives reference conditions from abiotic environmental characteristics of individual sites and quantify the derivation between the predicted fish communities in the absence of any human disturbance and the observed fish communities described during a fish sampling occasion. The metrics used are based on species guilds describing the main ecological an biological characteristics of the fish communities. The main objective was to optimize, first, the specificity, capacity of the index to correctly classify an actual undisturbed site as undisturbed and, in a second step, the sensitivity to detect the effects of different pressures on fluvial ecosystems. When applying EFI+ method, the fish assemblage status is determined by two index each one made by two different metrics. This metrics are richness of rheophilic species, abundance of oxygen depletion oxygen, lithologic reproduction species and salmonic smaller than 15 cm. These metrics was chosen out of 58 tested metrics, which reflecting different aspects of fish assemblage structure, selected from the available literature and tested for their potential to indicate habitat degradation. The objective of this poster is to explain the statistical procedure carried out to obtain the EFI+, as well as the methods and criteria applied to select the four final metrics. Finally is shown the error estimations and the limitations in the use of the index | |
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Internacional
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Si |
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Nombre congreso
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II International Statistical Ecology Congress |
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Tipo de participación
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960 |
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Lugar del congreso
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Kent University, Canterbury |
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Revisores
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Si |
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ISBN o ISSN
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DOI
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Fecha inicio congreso
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06/07/2010 |
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Fecha fin congreso
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09/07/2010 |
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Desde la página
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1 |
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Hasta la página
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1 |
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Título de las actas
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Second International Statistical Ecology Congress Summary Book |