The eastern coastal basins of Brazil are a series of small and isolated rivers that drain
directly into the Atlantic Ocean. During the Pleistocene, sea-level retreat caused by …

Worldwide freshwater bodies that cross agricultural or urban areas are exposed to mixtures
of xenobiotics. In particular, pesticides are usually part of these mixtures and could come …

Land-use changes have negative effects on stream conditions and fish assemblages, but
their effects on water quality and the use of microhabitats by fish in subtropical lowland …

ABSTRACT The Neotropical genus Scleronema is revised based on the re-examination of
the type specimens and 1,713 newly collected specimens. Scleronema is diagnosed from …

Species delimitation is a permanent issue in systematics. The increasing recognition of
geographically isolated populations as independent lineages allowed by new methods of …

Abstract The Amazon Molly (Poecilia formosa) reproduces by gynogenesis, a relatively rare
form of asexual reproduction where sperm is required to trigger embryogenesis, but male …

Abstract The Pampas of South America represents one of the most extended subtropical–
temperate grasslands in the world. This ecoregion was influenced by Pleistocene climate …

A headwater or river capture is a phenomenon commonly invoked to explain the absence of
reciprocal monophyly of genetic lineages among isolated hydrographic basins in freshwater …

Parasites have proven to display high responsiveness to anthropogenic stress, having,
therefore a considerable value as bioindicators. We analysed the variability in the structure …

Achondrostoma salmantinum is a small, endangered freshwater fish endemic to Spain.
Although the species is a member of the widely distributed family Leuciscidae, its …