Ichthyofauna of Marinheiros Island, Patos Lagoon estuary, southern Brazil

Abstract

Abstract:Marinheiros is the largest island of the estuarine archipelago of Patos lagoon and is considered an area of biological relevance in the coastal region of the extreme south of Brazil. Aiming to contribute to the knowledge on the biodiversity of this important area, we conducted an ichthyofaunistic inventory in the limnic environments of the island. Twenty-seven field trips were performed between April 2015 and May 2017. A total of 12 sites representative of habitats of an intermittent shallow lagoon, intermittent pools and a perennial artificial channel were sampled. Sampling of 2,436 specimens revealed the occurrence of 30 species, including the non-native piscivorous Acestrorhynchus pantaneiro. Characiformes was the most diverse order (18 species), followed by Cichliformes (four species) and Cyprinodontiformes (three species). Characiformes was also the most numerically abundant order (77%) followed by Cichliformes (17.6%) and Cyprinodontiformes (5.1%). The species richness recorded in Marinheiros Island is is comparable to the richness observed for lotic systems of southernmost Brazilian coastal plain. The fish assemblage is composed mainly of species of limnic habits whereas few taxa of estuarine-marine-limnic and estuarine-limnic habits were recorded. In view of the presence of allochtonous A. pantaneiro and its potential to impact native species, monitoring is recommended to the ichthyofauna of Marinheiros Island and the other estuarine islands, as well as peninsular systems connected to Patos lagoon estuary. Keywords: Acestrorhynchus pantaneiro, ictiocenose, invasive species, Neotropical region Ictiofauna da Ilha dos Marinheiros, estuário da Lagoa do Patos, sul do BrasilResumo: Marinheiros é a maior ilha do arquipélago estuarino da Lagoa dos Patos e é considerada uma área de relevância biológica na região costeira do extremo sul do Brasil. Com o objetivo de contribuir para o conhecimento sobre a biodiversidade desta importante área, realizamos um inventário ictiofaunístico nos ambientes limnicos da ilha. Vinte e sete visitas foram realizadas entre abril de 2015 e maio de 2017. Um total de 12 locais representativos dos habitats de uma lagoa rasa intermitente, poções intermitentes e um canal artificial perene foram amostrados. A amostragem de 2.436 espécimes revelou a ocorrência de 30 espécies, incluindo o piscívoro não-nativo Acestrorhynchus pantaneiro. Characiformes foi a ordem mais diversa (18 espécies), seguido por Cichliformes (quatro espécies) e Cyprinodontiformes (três espécies). Characiformes foi também a ordem mais numericamente abundante (77%), seguida po Cichliformes (17,6%) e Cyprinodontiformes (5,1%). A riqueza de espécies registrada na Ilha dos Marinheiros é comparável à riqueza observada para sistemas lóticos da planície costeira do extremo sul do Brasil. A assembleia de peixes é composta principalmente por espécies de hábitos límnicos, enquanto que poucos taxa de hábitos estuarino-marinho-límnico e estuarino-límnico foram registrados. Em vista da presença do alóctono A. pantaneiro e ...

Amphisbaena trachura Cope, 1885 (Amphisbaenia: Amphisbaenidae): new record for the northeast of Argentina

“…This record contributes to the knowledge of the geographical distribution of Amphisbaena trachura, a (Gans 1966;Lema et al 1980;Vieira et al 1980;Gomes and Krause 1982;Lema et al 1984;Lema 1994;Montero 1994Montero , 1996Montero and Terol 1999;Borges-Martins et al 2007;Barbo and Sawaya 2008;Marques et al 2009;Quintela et al 2011aQuintela et al , 2011bPerez et al 2012 …”

Reptile diversity of Sinos River Basin

“…However, there is little available information on this snake. Seven species, Bothrops cotiara, Chironius exoletus, Clelia hussami, Enyalius iheringii, Philodryas arnaldoi, Taeniophallus occipitalis and Urostrophus vautieri ( Figure 2AY, 2M, 2R, 2F and 2H) were exclusive to the Upland but Taeniophallus occipitalis and Urostrophus vautieri likely occur along the whole basin due to their generalist habits and wide geographic distribution (Lema 2002, Di-Bernardo et al 2003, Quintela et al 2011. Chironius exoletus, although more frequent in areas of Dense Ombrophilous Forest, has records in areas with other forest formations of the Atlantic Forest, both in the plateau and the coastal plain, thus it likely occurs in the three portions of the basin.…”

<em>Amphisbaena trachura</em> Cope, 1885 (Amphisbaenia: Amphisbaenidae): new record for the northeast of Argentina

“…Geographic distribution of Amphisbaena trachura. Black circles represent the previous records (Gans 1966;Lema et al 1980;Vieira et al 1980;Gomes and Krause 1982;Lema et al 1984;Lema 1994;Montero 1994Montero , 1996Montero and Terol 1999;Borges-Martins et al 2007;Barbo and Sawaya 2008;Marques et al 2009;Quintela et al 2011aQuintela et al , 2011bPerez et al 2012 Table 1. Morphological and meristic characters of the seven individuals of A. trachura (Amphisbaenidae) analyzed.…”