Dependency and independency among fish density and electivity indices in a stream fish assemblage

摘要: Habitat preferences can be identified from population density and electivity indices, which derived either abundance or occurrence data. This study examined the preference detectability independency of indices different data sources -- occurrence. Eight scenarios comprising four fish species along two environmental gradients (flow velocity water depth) in an undisturbed mountain stream were used this study. Fish seven calculated for eight scenarios. The correlation analyses illustrated that positively correlated with all while only three Electivity each other within same quality (abundance occurrence) but not between. Chesson’s L index was less should cautiously. Natural historical traits, such as social interactions among organisms, may affect performance indices. In conclusion, is a good indicator. Abundance represent cautiously fast assessment. Three Ivlev’s E E′ Jacobs’ D, recommended their ease understanding.