Physical functionality as an indicator of habitat availability in Islas Marietas, Nayarit, Mexico
Keywords:
Reef, functional diversity, reef functional index, Mexican PacificAbstract
Background. Few investigations use functional diversity and the reef functional index (IFA) to assess the sta-te of reef communities. Objectives. Evaluate physical functionality as an indicator of fish habitat availability and its relationship with functional diversity. Methods. The physical functionality of the reef was evaluated using the IFA, integrating data on coral cover, structural complexity, and calcification rate. The structure of the fish assemblages was analyzed by calculating functional diversity indices (richness, evenness, and divergen-ce) based on six functional traits (body size, mobility, activity period, type of aggregation, position in the water column, and diet). The relationship between functional diversity and IFA was evaluated using linear regression analysis. Results. Área de Restauración showed the highest values in the IFA; on the contrary, Túnel Amarra-dero presented the lowest values. In both sites, a greater presence of Pocillopora verrucosa was observed. Functional diversity presented the lowest values in the three functional indices in Área de Restauración. Linear regression analyses were not significant. Conclusions. No linear relationship was found between the IFA and functional diversity; this can be attributed to the fact that in sites with low coral cover, such as Islas Marietas, the functional diversity of fish presents a weak relationship with the three-dimensionality provided by corals since in sites with low coral cover, other structural elements (geologic features and rock substrates) could promote these three-dimensional structures.
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