Gymnogeophagus is a Neotropical cichlid genus distributed in the río Paraguay, rio Paraná
and rio Uruguay drainages and also in the coastal rivers of Uruguay and southern Brazil. Its …

Neotropical ecosystems are renowned for numerous examples of adaptive radiation in both
plants and animals resulting in high levels of biodiversity and endemism. However, we still …

Morphological and genetic analyses of species of Australoheros focusing on those
distributed in coastal rivers from the Rio de La Plata north to the Rio Buranhém, support …

We provide a review of the systematics of Herichthys by evaluating the usefulness of several
mitochondrial and nuclear genetic markers together with morphological data. The nDNA …

Intraspecific morphological variation can be generated by a set of historical and ecological
processes, and can be induced by anthropogenic actions. One such activity that has large …

The distributions of many Northern Hemisphere organisms have been influenced by
fluctuations in sea level and climatic conditions during Pleistocene interglacial periods …

This study assesses the patterns of variation in body shape, and relations of morphological
similarity among species of the Theraps–Paraneetroplus clade in order to determine …

We address the diversity of two species groups of the cichlid genus Gymnogeophagus in the
Middle Paraná basin using molecular phylogeography and traditional morphological …

Volcanic crater lakes are isolated habitats that are particularly well suited to investigating
ecological and evolutionary divergence and modes of speciation. However, the mode …

Body size is an important correlate of life history, ecology and distribution of species. Despite
this, very little is known about body size evolution in fishes, particularly freshwater fishes of …