Peixes de água doce das bacias costeiras no domínio da Mata Atlântica na ecorregião hidrográfica do Nordeste Médio-Oriental
One of the most threatened woodlands in the world is the Atlantic Forest, which is classified as a biodiversity hotspot since it presents high levels of species richness and endemism. However, our knowledge level is variable with regards to taxonomic groups and geographic regions. Fishes freshwat...
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| Formato: | Dissertação |
| Idioma: | por |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/24608 |
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| Resumo: | One of the most threatened woodlands in the world is the Atlantic Forest, which is
classified as a biodiversity hotspot since it presents high levels of species richness and
endemism. However, our knowledge level is variable with regards to taxonomic groups
and geographic regions. Fishes freshwater status of the art has pointed that ichthyofaunal
inventories should be immediately managed in Northeastern Brazilian Atlantic Forest
basins due to impacts of human actions. Ichthyofaunal knowledge of the Mid-
Northeastern Caatinga ecoregion (MNCE), which encompasses the basins between
Parnaíba and São Francisco rivers, is considered to be partial with only a few studies
concerning fishes, in the areas under influence of the Atlantic Forest. This ecoregion is
chiefly under the effects of Caatinga, but the drainages that flow into the east coast are
partially or completely inserted in the Atlantic Forest domain. Therefore, the aim of this
research is to define the richness of freshwater fish species of the basins that drain the
MNCE. Within these drainages there were recorded 57 species of freshwater fishes in 43
genera, 19 families, and six orders; 10 native species were recorded only in Atlantic
Forest domains, and five within Caatinga limits. The remaining (n=43) are shared
between both biomes. There are also listed species that are endemic to the ecoregion
(n=9), threatened (n=1), and non-native (n=9). Paraíba do Norte river basin, the largest
among the studied ones, showed the highest species number. This inquiry also presents a
list of protected species in conservation units in MNCE. The study also shows patterns in
the composition of species in the different drainages, be they microbasins, small and
medium basins, also indicating sample gaps in these. The results raise the continental fish
species richness to 39 in the Atlantic Forest, which encompassed mainly the ichthyofauna
southern to São Francisco river. |
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