Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism

Abstract

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.

Geographic range extension of Rapatea paludosa Aubl. (Rapateaceae) to Maranhão state, northeastern Brazil

“…The conservation of the remaining forest areas in Maranhão is of utmost importance since successive anthropic impacts could compromise the existing natural areas, leading to in the disappearance of species, or even taxa unknown to science (Koch and Araújo-Silva 2014;Rodrigues et al 2017). As observed for R. paludosa, the conservation of forest fragments and systematic floristic surveys has resulted in new records for the flora of Maranhão and the filling of some knowledge gaps (Koch and Araújo-Silva 2014;Ferreira et al 2017Ferreira et al , 2018Guarçoni et al 2018aGuarçoni et al , 2018bSilva Junior et al 2018…”

Ficha de Abapeba echinus

“…A área de endemismo de Belém (BAE) indicada como área de distribuição potencial representa uma ecorregião homogênea, originalmente coberta por densa floresta amazônica ombrófila, sendo a área de endemismo mais ameaçada para a Bacia Amazônica sofrendo com perda de habitat (Rodrigues et al, 2017).…”