Composição específica e distribuição da fauna de caranguejos de água doce (Crustacea: Decapoda: Brachyura) no estado de Roraima, Brasil
The state of Roraima is drained in almost its entire surface by the watershed of the Branco River. This drainage has diverse aquatic habitats still poorly known from the scientific point of view. This study aimed to survey the specific composition and geographical distribution of freshwater crab...
| Autor principal: | Costa, Francinéia Zanetti da |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11345 http://lattes.cnpq.br/0364765864981005 |
| Resumo: |
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The state of Roraima is drained in almost its entire surface by the watershed of the
Branco River. This drainage has diverse aquatic habitats still poorly known from the
scientific point of view. This study aimed to survey the specific composition and
geographical distribution of freshwater crab fauna from Roraima. The survey was based
on specimens deposited in the crustacean collections of the Museu Integrado de
Roraima (MIRR), Boa Vista, and the Instituto Nacional de Pesquisas da Amazônia
(INPA), Manaus. In addition, samples were taken in ten municipalities (Amajari,
Bonfim, Cantá, Caracaraí, Caroebe, Normandia, Pacaraima, São Luiz do Anauá, São
João da Baliza, and Rorainópolis) covering regions of “Lavrado”, forests, flooded
forests and upland areas and low elevations. The collection of crabs was performed
using dip net with 1 mm mesh, sampling all habitats of the streams, such as the
submerged litter, aquatic vegetation, edges of ravines, hollows of submerged tree
truncks, trying to cover all microhabitats possibly occupied by crabs. Traps were also
used (locally known as "Covo"), with dead bait and commercial cat food. A total of
eleven species of crabs were recorded from Roraima: four of Trichodactylidae:
Moreirocarcinus laevifrons, Poppiana dentata, Sylviocarcinus pictus and Valdivia
serrata; and seven of Pseudothelphusidae: Fredius beccarii, Fredius estevisi, Fredius
fittkaui, Fredius platyacanthus, Fredius stenolobus, Kingsleya ytupora and Kingsleya
latifrons. Additionally, identification keys are provided to families, genera and species,
as well as geographic distribution maps for each species. Among these,
Moreirocarcinus laevifrons, Fredius beccarii, Fredius fittkaui, and Kingsleya ytupora
are recorded for the first time in Roraima; additionally, Fredius beccarii is recorded for
the first time from Brazil. |