SciELO - Scientific Electronic Library Online

 
vol.89 issue3Numerical Simulations to Assess ART and MART Performance for Ionospheric Tomography of Chapman ProfilesAntidiarrheal activity of extracts from Maytenus gonoclada and inhibition of Dengue virus by lupeol author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Anais da Academia Brasileira de Ciências

Print version ISSN 0001-3765On-line version ISSN 1678-2690

Abstract

RODRIGUES, BRUNO V.B. et al. Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism. An. Acad. Bras. Ciênc. [online]. 2017, vol.89, n.3, pp.1543-1553.  Epub Aug 17, 2017. ISSN 1678-2690.  http://dx.doi.org/10.1590/0001-3765201720150378.

A list of spider species is presented for the Belém Area of Endemism, the most threatened region in the Amazon Basin, comprising portions of eastern State of Pará and western State of Maranhão, Brazil. The data are based both on records from the taxonomic and biodiversity survey literature and on scientific collection databases. A total of 319 identified species were recorded, with 318 occurring in Pará and only 22 in Maranhão. About 80% of species are recorded at the vicinities of the city of Belém, indicating that sampling effort have been strongly biased. To identify potentially high-diversity areas, discounting the effect of variations in sampling effort, the residues of a linear regression between the number of records and number of species mapped in each 0.25°grid cells were analyzed. One grid, representing the Alto Turiaçu Indigenous land, had the highest deviation from the expected from the linear regression, indicating high expected species richness. Several other grid cells showed intermediate values of the regression residuals, indicating species richness moderately above to the expected from the model.

Keywords : Amazon; araneae; diversity; fragmentation.

        · text in English     · English ( pdf )