Dynamics of fish assemblages on a continuous rocky reef and adjacent unconsolidated habitats at Fernando de Noronha Archipelago, tropical western Atlantic

A study on the Brazilian Atlantic Islands revealed that species richness of reef fish assemblages is significantly influenced by topographical complexity and the percent cover of algae, excluding coralline algae. This research, conducted at Fernando de Noronha Archipelago in the tropical western Atlantic, used underwater techniques to assess both fish numbers and microhabitat variables such as depth, rugosity, crevice number, and benthic organism coverage. The findings indicate that higher species richness was observed on consolidated substrata during both sampling periods (May and October), while fish abundance showed no significant spatial variation. The study highlights the importance of assessing multiple microhabitat variables to understand their relative influence on reef fish assemblages, contributing valuable insights to the understudied South Atlantic region.

Medeiros, P. R., Rosa, R. S., & Francini-Filho, R. B. (2011). Dynamics of fish assemblages on a continuous rocky reef and adjacent unconsolidated habitats at Fernando de Noronha Archipelago, tropical western Atlantic. Neotropical Ichthyology, 9(4), 869–879. https://doi.org/10.1590/s1679-62252011005000048