Fish abundance and distribution patterns related to environmental factors in a choked temperate coastal lagoon (Argentina)

Abstracts

The aim of this study was to assess the influence of environmental factors on the fish distribution and abundance in Mar Chiquita coastal lagoon. Seasonal fish sampling stations were distributed along the lagoon and grouped in three zones from a mixo-oligohaline waters zone with high contribution of freshwater to a mixo-eurihaline waters zone with high marine water influence. A mixo-mesohaline waters zone characterized the middle part of the lagoon. The results showed that the fish composition was dominated by marine estuarine dependent (ED) species in all three zones and in all seasons: Odontesthes argentinensis, Brevoortia aurea, Mugil liza and Micropogonias furnieri were the most representative species. The following important ecological category was freshwater fishes (FW), with Platanichthys platana and Jenynsia multidentata being the most representative species. According to the best model selected, by fitting generalized linear models, abundance of ED increased as water temperature increased during summer and autumn in all three zones. The highest abundance was recorded in the mixo-eurihaline waters zone. On the other hand, FW abundance increased with high rainfall and also when easterly winds blew. In conclusion, a differential habitat use by the species that occur in the Mar Chiquita coastal lagoon was observed. A few ED species dominated the fish composition but FW species also made use of the lagoon during periods of heavy rainfall.

Fish distribution patterns; Estuarine environments; Generalized linear models; Mar Chiquita coastal lagoon

O objetivo deste estudo foi avaliar a influência de fatores ambientais sobre a distribuição e abundância de peixes na lagoa costeira Mar Chiquita. Estações sazonais de amostragem de peixes foram distribuídas ao longo da lagoa e agrupadas em três zonas de uma zona de águas Mixo-oligohalino com elevado aporte de água doce para uma zona de águas Mixo-eurihaline com alta influência da água do mar. Uma zona de águas Mixo-mesohalino caracteriza a parte do meio da lagoa. Os resultados mostraram que a composição dos peixes foi dominada por espécies marinhos estuarinos dependentes (ED) em todas as três zonas e em todas as estações: Odontesthes argentinensis, Brevoortia aurea, Mugil liza e Micropogonias furnieri foram as espécies mais representativas. A categoria seguinte mais importante foi peixes de água doce (FW), com Platanichthys platana e Jenynsia multidentata sendo as espécies mais representativas. De acordo com o melhor modelo selecionado pelo ajuste de modelos lineares generalizados, a abundância de ED aumentou de acordo com a temperatura da água durante o verão e outono, em todas as três zonas. A maior abundância foi registrada na zona de águas mixo-eurihalinas. Por outro lado, a abundância de FW aumentou com o aumento da pluviosidade e também quando os ventos de direção leste sopraram. Em conclusão, a utilização diferencial do habitat pelas espécies que ocorrem na lagoa costeira Mar Chiquita foi observada. Poucas espécies ED dominaram a composição de espécies de peixes, enquanto FW fizeram uso da lagoa quando as condições de alta pluviosidade foram observados.

Padrões de distribuição de peixes; Ambientes estuarinos; Modelos lineares generalizados; Lagoa costeira Mar Chiquita

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Publication Dates

• Publication in this collection
  17 Apr 2013
• Date of issue
  Mar 2013

History

• Received
  09 July 2012
• Accepted
  04 Feb 2013
• Reviewed
  03 Feb 2013