The effect of hydrological connectivity on the fish composition and abundance in a floodplain system from the South-East Gulf of California, Mexico

The effect of hydrological connectivity on the fish assemblages was assessed through the samplings of fishes and environmental variables in the floodplain wetlands in the Las Cabras region, Mexico. Community structure attributes such as species richness, diversity indices, abundance, and biomass were compared between the rehabilitation site (removed road) control site (with the road). Fish from eight sites were sampled by seine nets between February and April 2015. The total species richness was low, with the 5260 fish, comprising 14 species belonging to 11 families. Cichlidae and Poecilidae were the most frequent and dominant species. The most abundant fish collected were poeciliids, Poeciliopsis latidens making up 37% and Poecilia butleri 31% of all fish collected. In terms of biomass, Orechromis aureus was dominant (48%) in the both studied sites. Physical habitat characteristics were not correlated with fish assemblages. The similarity analysis showed considerable similarity in the organisms that were exploited by the seine net in the area. With the respect to the abundance, the results showed tendency for higher abundance in the rehabilitation site than in the control site. The results of the study did not confirm the impact of the hydrological connectivity on the fish composition in the studied area. It suggested to do samplings in the long-term scale with the consideration of the wet season.

Promotor(s) & Supervisor: Felipe Amezcua

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0511 - Biology