Journal
MARINE ENVIRONMENTAL RESEARCH
Volume 159, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2020.105016
Keywords
Functional traits; Functional originality; Fish assemblages; Estuarine fish; Temporal changes; Tropical systems
Funding
- CNPq-Brazilian National Agency for Scientific and Technological Development [302878/05-0, 302555/08-0]
- FAPERJ (Rio de Janeiro State Agency for Research Development) [E-26/170.258/01]
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Classifying species into groups based on taxonomic relationship and functions are objective approaches to evaluate environmental and anthropogenic influences on coastal fishes. We evaluated temporal (1993-1995 and 2012-2015) changes in the taxonomic and functional indices in three zones of a tropical bay heavily impacted over the recent decades. We tested the hypothesis that both indices decrease over time as result of the environmental degradation. A decrease in the taxonomic richness and abundance was observed mainly of the inner zone. The functional structure remained relatively stable, but the functional originality decreased significantly between the two periods. This functional loss is of particular concern because the loss of species with unique treats may generate a series of ecosystem damage. This information tells us that the use of functional indices is essential to complement taxonomic assessments and to detect a more detailed understanding of the real dimension of biodiversity loss in impacted environments.
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