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Structure of the Community of Dominant Fish Species Associated to Soft-Bottoms in the Lagoon of La Paz, B.C.S., México

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Document pages: 14 pages

Abstract: Thestudy of fish communities from coastal lagoons allows a better understanding ofrole of these organisms in these systems, and the effect of anthropogenicimpact. The aim of the present study was to determine the community structure,in particular dominance of fish species associated to soft bottoms in thelagoon of La Paz. Six bimonthly samplings were carried out in seven localitiesfrom November 2016 to September 2017 and physicochemical parameters wererecorded. Analysis of temperature showed differences between two markedseasons, warm and cold. Species richness showed differences between months andlocalities. Shannon-Weaver index and Pielou’s evenness showed significantdifferences only between months. Simpson’s index suggests a high diversity.According to the BVI, 15 species from the families Haemulidae, Sciaenidae andGerreidae, were the most biologically important. Zoogeographic affinityanalysis showed that 58 of the species prefer the Province of Cortez. Dominantspecies recorded in this study play a key role in soft-bottom systems like the lagoonof La Paz.

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