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Mostrando ítems 111-120 de 493
Morphological and molecular evidence for two new species of Tetragonopterus (Characiformes: Characidae) from central Brazil
(2013-05-01)
The combination of morphological and molecular data of Tetragonopterus species collected in the Rio Araguaia basin allows the recognition of two undescribed species that are presented in this article. These species are ...
Short-term response of fish assemblages to instream habitat restoration in heavily impacted streams
(2020-01-01)
Habitat homogenization has been a major impact in stream ecosystems, and it is considered one of the main drivers of biotic homogenization as well, leading to the loss of water quality and fish diversity. In this study, ...
Shared or distinct responses between intermediate and satellite stream fish species in an altered Amazonian River?
(2017-12-01)
Environmental and spatial variables can distinctly influence the occupancy frequency distributions in stream fish. From a metacommunity context, we tested the following hypothesis, intermediate species are governed by ...
Neotropical freshwater fishes imperilled by unsustainable policies
(Wiley-Blackwell, 2017-11-01)
Neotropical freshwater fishes are the most diverse on the planet (>5,500 species), although nations in Latin America have been negligent regarding their conservation. National policies have historically encouraged unsustainable ...
Revalidation and redescription of Steindachnerina nigrotaenia and redescription of S. insculpta (Characiformes: Curimatidae)
(Soc Brasileira Ictiologia, 2019-01-01)
Steindachnerina nigrotaenia is resurrected from the synonym of S. brevipinna and considered a valid species. The previous designation of the lectotype of S. nigrotaenia is considered invalid and a new lectotype is designated ...
A new species of Hemigrammus Gill 1858 (Characiformes: Characidae) from the upper Rio Negro, Amazon basin, Brazil
(2019-02-14)
A new species of Hemigrammus is described from the upper Rio Negro, Amazon basin, Brazil. The new species is distinguished from all congeners by its unique color pattern consisting of a single humeral blotch clearly spaced ...
A new species of Poptella (Characiformes: Characidae: Stethaprioninae) from the Rio Juma, Rio Madeira basin, Brazil
(2019-01-01)
A new species of Poptella is described from the Rio Juma, a tributary of the lower Rio Aripuanã, Rio Madeira basin, Amazonas, Brazil. The new species is distinguished from all congeners, except P. brevispina, by having a ...
A new Late Jurassic halecomorph fish from the marine Vaca muerta formation, Argentina, southwestern Gondwana
(Copernicus GmbH, 2016-03)
The knowledge of Mesozoic fish faunas of the Southern Hemisphere is still inadequate; the diversity and evolution of the Late Jurassic marine ichthyofaunas of Argentina remain unclear. One fish recovered from the Tithonian ...
Tributaries as biodiversity preserves: An ichthyoplankton perspective from the severely impounded Upper Paraná River
(2019-02-01)
Conservation of fish assemblages in severely impounded rivers has often focused on providing longitudinal and lateral connectivity along the main stem. Less attention has been given to tributaries, some of which remain ...