A ictiofauna de cabeceiras do rio Tietê, São Paulo, Brasil

Abstract

The ichthyofauna from the headwaters of the rio Tietê, São Paulo, Brazil. Biota Neotrop. 11(3): http://www.biotaneotropica.org.br/v11n3/en/abstract?inve ntory+bn00311032011Abstract: A synthesis of the ichthyofauna of the headwaters of the rio Tietê, based on material from zoological collections and new samplings, is presented. Fifty six species belonging to seven orders and 16 families are recorded to the drainage, increasing previous numbers significantly. The current results show that the headwaters of the rio Tietê possess a singular ichthyofauna composition, diverse from that found in the remaining of the upper Paraná basin, with high level of endemic species and great similarity to the species from coastal drainages. This finding corroborates the hypothesis of past river capture between streams and rivers in both drainages. Among the species occurring in the area surveyed, eight are endemic (14.3%), 13 are found in the headwaters of rio Tietê and in the coastal drainages of southeastern Brazil (23.2%), 10 are present throughout the upper Paraná basin (17.9%), five are found in the upper Paraná basin and in the coastal drainages of southeastern Brazil (8.9%), while 13 show a broader distribution in the South America drainages (23.2%), part of which still remains to be identified. Species diversity increased with the discovery of at least five new species belonging to the genera Cyphocharax, Characidium, Astyanax, Pareiorhina and Australoheros, and four new records for Characidium cf. zebra, Scleromystax barbatus, Crenicicla britskii and Synbranchus cf. marmoratus. At least, seven non-native species are recognized to be established in the region, while 10 other are included in red books. Resumo: Uma síntese das espécies de peixes de cabeceiras do rio Tietê é apresentada com base em material de coleções zoológicas e novas coletas realizadas. São referidas para região 56 espécies pertencentes a sete ordens e 16 famílias, aumentando significativamente números anteriores. Os resultados mostram que as cabeceiras do rio Tietê possuem uma composição ictiofaunistica bastante peculiar, distinta daquela encontrada no restante do Alto rio Paraná, mostrando acentuado grau de endemismo e grande similaridade com bacias hidrográficas litorâneas, corroborando a hipótese de captura de rios da região por drenagens costeiras e vice e versa no passado. Dentre as espécies encontradas na região, oito são endêmicas (14,3%), 13 são encontradas nas cabeceiras do rio Tietê e drenagens litorâneas da região sudeste do Brasil (23,2%), dez ocorrem em todo Alto rio Paraná (17,9%), cinco são encontradas no Alto rio Paraná e drenagens litorâneas da região sudeste do Brasil (8,9%), enquanto 13 espécies mostram uma ampla distribuição na América do Sul (23,2%), das quais parte ainda precisa ter a identidade confirmada. A diversidade de espécies é acrescida de pelo menos cinco espécies novas pertencentes aos gêneros Cyphocharax, Characidium, Astyanax, Pareiorhina e Australoheros e quatro novos registros são feitos para Characidium cf. zebra, Scl...

Fish fauna in forested and rural streams from an ecoregion of high endemism, lower Iguaçu River basin, Brazil

“…This pattern of low species richness, associated with high endemism, has also characterized the ichthyofauna of other low-order streams in Iguaçu River basin (Ingenito et al 2004, Bifi et al 2006, Abilhoa et al 2008. These findings distinguish the fish fauna of headwaters of Iguaçu River basin from others similar streams of Paraná River system, with higher species richness (Araújo et al 2011, Marceniuk et al 2011, Hoffmann et al 2015, Vidotto-Magnoni et al 2015, Cetra et al 2016, Frota et al 2016a). Lower fish richness was also verified by Larentis et al (2016) to those that flows downstream it.…”

Environmental heterogeneity explains species turnover but not nestedness in fish assemblages of a Neotropical basin

“…It is worth to mention the capture of P. platana, a clupeid fish registered mainly in the La Plata basin and brackisk lagoons of the coastal region of Brazil, Uruguay and Argentina. Platanichthys platana was registered in previous surveys in headwaters of the Tiête river (Langeani et al, 2007;Marceniuk et al, 2011;Furlan et al, 2013), but only recently was captured in the Paraná River floodplain and it is unknown whether this species is successful and stablished in this region.…”

Diversidade e riqueza de formigas (Hymenoptera: Formicidae) em remanescentes de Mata Atlântica na Bacia Hidrográfica do Alto Tietê, SP

“…No Estado de São Paulo, a Floresta Ombrófila pode ser dividida em três formações: as matas de planície litorânea, as matas de encosta e as matas de altitude (Joly et al 1992). Na Bacia Hidrográfica do Alto Tietê do Rio Tietê, a Floresta Ombrófila Densa ainda predomina na Serra do Mar e nas encostas da Serra do Itapeti, apesar de toda a pressão antrópica presente na região (Cetesb 1995, Marceniuk & Hilsdorf 2010.…”