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Biota Neotropica

versão On-line ISSN 1676-0611

Resumo

RAIZER, Josué; JAPYASSU, Hilton F.; INDICATTI, Rafael P.  e  BRESCOVIT, Antonio D.. Comunidade de aranhas (Arachnida, Araneae) do pantanal norte (Mato Grosso, Brasil) e sua similaridade com a araneofauna amazônica. Biota Neotrop. [online]. 2005, vol.5, n.1a, pp.125-140. ISSN 1676-0611.  http://dx.doi.org/10.1590/S1676-06032005000200011.

Spiders are good study subjects when it comes to the evaluation of animal community organization and of the habitat's influence over it. Nevertheless, the first step to understand the organization of a specific community is to record its species. An inventory of the spider fauna of the headwaters of the Paraguay River basin was carried out using systematic (beating tray and nocturnal transects) and casual samplings. As a result, at least 16 new species, as well as 39 new occurrences for the state of Mato Grosso were recorded. A total of 2114 spiders (602 of them adults), distributed among 206 morphospecies (35 families and 105 genera) were collected. Statistical estimates point towards the existence of a much larger number of spider species (at least 290) in the sampled areas. Together, Araneidae, Theridiidae and Salticidae, the most species rich families (51, 46 and 36 spp., respectively), represent more than 65% of the overall spider richness. A high number of species and a low number of individuals per species characterize community structure, a result that is typical for tropical spider communities. Amazonian influence, as depicted from faunal comparisons between species composition at Pantanal and Legal Amazonia, increases continuously from more southern localities, such as Cáceres (47% amazonian fauna) to northern localities, such as Indiavaí (75%), Reserva do Cabaçal (82%) or Jauru (86%).

Palavras-chave : Pantanal; Brazil; spiders; inventory; Araneae.

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