Ictiofauna do reservatório de Duas Unas, bacia do rio Jaboatão, Pernambuco: resultados preliminares da composição e estrutura da assembléia

Abstract

Ictiofauna do reservatório de Duas Unas, bacia do rio Jaboatão, Pernambuco: resultados preliminares da composição e estrutura da assembléia RESUMO O presente trabalho apresenta informações preliminares sobre a composição taxonômica e a estrutura da assembleia de peixes do reservatório de Duas Unas/PE, localizado na bacia do rio Jaboatão. Foram realizadas coletas mensais, entre abril de 2009 e março de 2010, com redes de espera (malhas de 12, 20 e 40 mm entrenós), com exposição de 24 horas. Foram capturados 322 exemplares pertencentes a 14 espécies, 14 gêneros, 10 famílias e 5 ordens. Foi constatada a ocorrência de três espécies alóctones: a pescada Plagioscion squamosissimus, a tilápia Oreochromis niloticus e o tucunaré Cichla kelberi. Cichlidae foi a família com maior riqueza (4 espécies), seguida por Curimatidae (2), e as demais com apenas uma espécie cada. Characidae apresentou a maior abundância numérica e biomassa, 170 indivíduos e 2.574,4 g, respectivamente. Astyanax gr. bimaculatus, Crenicichla cf. brasiliensis, Hoplias malabaricus e Steindachnerina notonota dominaram numericamente (81% do total de indivíduos) e em biomassa (78%). Apesar da baixa riqueza inventariada, os resultados evidenciam a importância da fauna autóctone e contribuem para a ampliação do conhecimento sobre a fauna de peixes de água doce das bacias costeiras de Pernambuco.Palavras-chave: Assembleia de peixes, Bacia costeira, barragem.Ichthyofauna of the Duas Unas Reservoir, Jaboatão River basin, Pernambuco, Brazil: preliminary results of composition and assemblage structure ABSTRACT This paper presents preliminary information on the taxonomic composition and structure of the fish assemblage of Duas Unas reservoir, located in the Jaboatão river basin, Pernambuco, Brazil. Fish samples were collected monthly from April 2009 to March 2010, using gill nets (12, 20 and 40 mm mesh sizes), with 24-hour exposure time. A total of 322 specimens belonging to 14 species, 14 genera, 10 families and 5 orders, were captured. The occurrence of three allochthonous species was registered: Plagioscion squamosissimus, Oreochromis niloticus and Cichla kelberi. The Cichlidae family was the richest (4 species), followed by Curimatidae (2), and the others were represented by only one species each. Characidae had the highest numerical abundance and biomass, with 170 individuals and 2,574.4 g, respectively. Astyanax gr. bimaculatus, Crenicichla cf. brasiliensis, Hoplias malabaricus and Steindachnerina notonota dominated numerically (81% of the total individuals captured) and in biomass (78%). Despite the low richness of the ichthyofauna surveyed, the results show the importance of the autochthonous fauna and contribute to broaden the knowledge about freshwater fish fauna from coastal basins of the state of Pernambuco.

Influence of local and landscape characteristics on the distribution and diversity of fish assemblages of streams in the Ivinhema River basin, Upper Paraná River

“…Brazil is home to about 43% of the known freshwater fish fauna (Buckup et al, 2007), but the knowledge on the composition of fish assemblages in different Brazilian river basins is still very weak and irregular (Silva Filho et al, 2011). the most common species for the Ivinhema River basin are also registered as common in other subbasins of the Upper Paraná River basin, we believe that the widespread distribution of these species is a result of their dispersal ability.…”

Novelty on the market, novelty in the environment: The invasion of non-native fish jaguar guapote (Perciformes) in northeastern Brazil

“…In addition, cichlids have a high degree of euryhalinity and are capable to survive in mesohaline conditions for long periods and could potentially use the brackish waters of estuaries as vectors for the dispersal to other environments (Gutierre et al, 2014). The jaguar guapote can also spread to tributaries of the Una, Ipojuca, Capibaribe and Pajeú Rivers, which have endemic freshwater species such as the cichlids black acará Cichlasoma orientale and the pike cichlids Crenicichla brasiliensis and C. menezesi (Rosa et al, 2005;Silva Filho et al, 2011), hence reaching the second, third, fourth and fifth stages of the process of biological invasion in these sites. The fifth stage already occurs in Gurjão Reservoir located in the Una River basin, where P. managuensis predates and competes for food with the native pearl cichlid Geophagus brasiliensis (Quoy and Gaimard 1824) (Figueiredo et al, 2015).…”

Ficha de Steindachnerina notonota

“…Endêmica do Brasil: Sim Steindachnerina notonota é conhecida das bacias costeiras do nordeste, desde o estado do Pará até o estado de Pernambuco, Brasil (Vari, 2003;Silva-Filho et al, 2011;Montenegro et al, 2012). A localidade-tipo da espécie é o rio Granjeiro, estado do Ceará, Brasil (Miranda Ribeiro, 1937).…”