Influence of Fishing Activity on Total Species Richness and Abundance Unevenness in Reef Fish Communities: A Case Study in a Brazilian Tropical Coral Complex

Main Article Content

Jean Béguinot

Abstract

The internal organization of reef-fish communities, particularly the species richness and the hierarchical structuring of species abundances, depends on many environmental factors, including fishing intensity and proportion of macroalgal cover which are expected to have determinant influences. However, reported studies on this topic are generally based on incomplete samplings (almost unavoidable in practice when dealing with highly uneven and species-rich communities), so that the derived results can be appreciably skewed. To overcome this difficulty, the incomplete samplings involved in this study were completed numerically through a reliable extrapolation procedure. This precaution provided a safe confirmation that reduced fishing activity and increased macroalgae cover both contribute to enhance the total species richness and to reduce the abundance unevenness in these reef fish communities.  Yet, it is shown that this reduction of abundance unevenness is almost entirely attributable to the increase in species richness.

Keywords:
Species diversity, ranked abundance distribution, hierarchical structuration, evenness, incomplete sampling, numerical extrapolation, feeding guild, western tropical Atlantic

Article Details

How to Cite
Béguinot, J. (2019). Influence of Fishing Activity on Total Species Richness and Abundance Unevenness in Reef Fish Communities: A Case Study in a Brazilian Tropical Coral Complex. International Journal of Environment and Climate Change, 9(1), 58-76. https://doi.org/10.9734/ijecc/2019/v9i130097
Section
Original Research Article