Impacto da resolução de atributos funcionais de hábito alimentar em padrões de diversidade funcional das assembleias de peixes tropicais

Abstract

Community descriptors based on attributes have been widely used to make inferences about mounting rules in a community. The level of discrimination used to identify attributes (resolution) influence the estimates of diversity at the community level. Thus, the practical decisions about how the attributes are measured may have repercussions on the patterns of diversity and its correlation with forecast variables. We have developed a framework to evaluate: i) how much information is lost when the resolution on the measurement of performance is reduced, and; II) to what extent the morphological characteristics and phylogeny can be used as a substitute for strategy. We tested also the resolution on the measurement of attributes affects the ability to discriminate different functional diversity marine habitats. We used empirical data from the community of marine fish and correlate with the array of more detailed resolution diet (proportion of food items in the stomach contents of the collected specimens) with matrices (for par) on different resolutions of diet (trophic array based on secondary data; in primary data; primary data of presence and absence of diet food items; primary data as the 0 , 1 and 2 according to itensde foods of importance), eco-morphology and phylogeny. We will then use a functional diversity index (FD) between three regions (influenced by the reef, lagoon and estuary) using different resolutions of attributes, phylogeny and ecomorphology. Phylogeny and ecomorfológicas characteristics were not correlated with the food strategy of the species. However, there was a strong correlation (0.7) between maximum resolution and diet data obtained at the expense of lower resolutions data. Significantly, the resolution was the only one able to discriminate different tropical habitats. These results do not support the use of substitutes for trophic characteristics and highlights the importance the resolution of trophic attributes as a measure to be considered in studies of functional diversity.