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Ecología Aplicada

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DEZA, Mariajosé  and  ANDIA, Juan Manuel. Diversity and species richness of the family Araneidae (Arachnida, Araneae) in CICRA (Madre de Dios - Peru). Ecol. apl. [online]. 2009, vol.8, n.1-2, pp.81-90. ISSN 1726-2216.

The aim of the present study was to register richness and diversity of the family Araneidae in CICRA. Quantitative collections were made in two marked seasons: dry season (ES: august-september, 2005) and rainy season (ELL: february - march, 2006), randomly choosing six plots of one hectare each, being the same for both seasons. Direct capture was used by means of manual collection, using the following methods: Ground Hand Collecting (collects up to the level of the knee) and Aerial Hand Collecting (collects from the level of the knee up to two meters of height approximately). Each method was applied during an hour, in the daytime (7:00 AM - 9:00 AM) and in the night (7:00 PM -9:00 PM) obtaining 24 samples. In the dry season 1516 individuals were collected, distributed in 25 genera and 120 species; in the rainy season 3173 individuals were collected, distributed in 24 genera and 121 species, totaling 154 spp. The most representative species in both seasons were Micrathena kirbyi (ES: 12%, ELL: 22%), Araneus sp. 1 (ES: 4.6%, ELL: 5%), Micrathena cf. exlinae (ES: 5.3%, ELL: 3.7%), Parawixia kochi (ES: 4%, ELL: 6.3%) and Cyclosa inca (ES: 6.7%, ELL: 6%). The diversity obtained in ES (H′: 3.829) was higher than in ELL (H′: 3.453) in spite of the fact that the ELL presented major richness and abundance.

Keywords : Araneae; Araneidae; diversity; species richness; Madre de Dios; Peru.

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