Inter-estuarine and temporal patterns of the fish assemblage of subtropical subestuaries along the río de la plata coast (Uruguay)

Acuna, Alicia, Munoz, Nathalie, Gurdek, Rodrigo, Machado, Irene, and Severi, Veronica (2017) Inter-estuarine and temporal patterns of the fish assemblage of subtropical subestuaries along the río de la plata coast (Uruguay). Brazilian Journal of Oceanography, 65 (2). pp. 173-186.

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Abstract

Fish assemblages in subestuaries have been poorly studied worldwide. In order to evaluate the inter-estuarine and temporal variability of the ichthyofauna of subestuaries along the Uruguayan coast of the Río de la Plata (RdlP), the Pando, Solís Chico and Solís Grande systems were sampled between 2011 and 2013. Fish biomass, abundance, species richness and diversity indices were analysed, defining fish assemblages characterised by a few species and great abundance. Estuarine resident and freshwater species represented 55.5% of the fish assemblage according to estuarine use guilds. Species occurrence was similar in the three subestuaries, but the relative abundances differed among them. The analysed community parameters showed a decreasing trend from west to east along the Uruguayan coast. Highest diversity and fish abundance were recorded in the Pando system located in the proximities of an important spawning area in the inner RdlP estuary. In the Solís Grande subestuary occurred the lowest species richness and fish abundance. The Solís Chico was characterised as a transitional subsystem. All three subestuaries showed an increase in species richness and abundance during high temperature periods, probably related to the life cycle of the species sharing habitats between the RdlP and the coastal subestuaries. This study constitutes the first step in assessing the fish assemblage patterns in coastal ecosystems of the RdlP and an approach about the ecological role of the subestuaries in the southwest Atlantic Ocean.

Item ID: 54094
Item Type: Article (Research - C1)
ISSN: 1982-436X
Keywords: community parameters; estuarine systems; Ichthyofauna; South American estuaries; species diversity; variability patterns
Funders: Universidad de la Republica (UR), Agencia Nacional de Investigacion e Inovacion
Projects and Grants: UR postgraduate program PEDECIBA 2012
Date Deposited: 15 Jun 2018 03:36
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060807 Animal Structure and Function @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060204 Freshwater Ecology @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 50%
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