Ichthyofauna of the upper Juruena river on Chapada dos Parecis, Mato Grosso, Brazil

Abstract

The fishes herein included were collected in four small streams of the upper rio Tapajós basin. Through fieldwork carried out in 2011, 2013 and 2014 during the low water season 1.728 specimens belonging to 22 species distributed in 11 families, and five orders were captured. Characidae was the most representative family both in number of species and specimens captured. The most abundant species were Hyphessobrycon melanostichos, H. hexastichos, and H. notidanos. Five species are recognized as new, and four as endemic to the upper rio Tapajós basin. This study represents the first fish inventory for the region and will provide valuable information for the conservation of the poorly known diversity of fishes of the Chapada dos Parecis, in the headwaters of the upper rio Tapajós basin. Keywords: South America, Neotropical fish, Amazon, endemism. Ictiofauna do alto rio Juruena na Chapada dos Parecis, Mato Grosso, BrasilResumo: Os peixes registrados aqui foram coletados em quatro igarapés da bacia do alto rio Tapajós. Expedições realizadas em 2011, 2013 e 2014 durante a estação de seca resultaram na coleta de 1.728 indivíduos pertencendo à 22 espécies distribuídas em 11 famílias e cinco ordens. Characidae foi a família com o maior número de espécies e espécimes capturados. As espécies com maior abundância foram Hyphessobrycon melanostichos, H. hexastichos e H. notidanos. Cinco espécies são reconhecidas como novas e quatro como endêmicas da bacia do alto rio Tapajós. Este trabalho representa o primeiro inventário sobre os peixes da região e fornecerá informações valiosas para a conservação da diversidade pouco conhecida de peixes da Chapada dos Parecis, nas cabeceiras da bacia do alto rio Tapajós. Sul, peixe Neotropical, Amazônia, endemismo. Palavras-chave: América do

Ichthyofauna of the ribeirão Sucuri, tributary of rio Tietê, upper rio Paraná basin, southeastern Brazil

“…Our results agree with other ichthyofaunistic studies in the upper rio Paraná and other Neotropical rivers, which also found a high diversity of these two orders (e.g. Castro et al 2004;Langeani et al 2007;Vari et al 2009;Esguícero and Arcifa 2011;Ohara and Loeb 2016). Indeed, Siluriformes and Characiformes are the most diverse groups of Neotropical freshwater fishes, followed by Gymnotiformes (Lowe-McConnell 1999;Fricke et al 2020).…”

Stream fish from recently deforested basins in the Meridional Amazon, Mato Grosso, Brazil

“…Rarity is another pattern observed from these assemblages since 15% of the species were singletons and 30% were uniques. This high occurrence of rare species mirrors another pattern for Amazonian streams, as indicated by several studies (e.g., Barros et al 2011, Casatti et al 2013, Ohara & Loeb 2016. However, the set of rare species was not the same in Aripuanã River and in Juruena River.…”

A new species of Eigenmannia Jordan & Evermann (Gymnotiformes: Sternopygidae) from rio Tapajós, Brazil, with discussion on its species group and the myology within Eigenmanniinae

“…rondoni (Miranda Ribeiro), Erythrinus erythrinus (Bloch & Schneider), Hemigrammus skolioplatus Bertaco & Carvalho, Hyphessobrycon hexastichos Bertaco & Carvalho, H . melanostichos Carvalho & Bertaco, Hasemania nambiquara Bertaco & Malabarba, and Hoplerythrinus unitaeniatus (Spix & Agassiz) (for other species see [46]). No other Gymnotiformes were collected with E .…”