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Redalyc.Spider Species Richness and Sampling Effort at Cracraft´S Belém Anais da Academia Brasileira de Ciências ISSN: 0001-3765 [email protected] Academia Brasileira de Ciências Brasil B. RODRIGUES, BRUNO V.; AGUIAR-NETO, MANOEL B.; DE OLIVEIRA, UBIRAJARA; SANTOS, ADALBERTO J.; BRESCOVIT, ANTONIO D.; MARTÍNS, MARLÚCIA B.; BONALDO, ALEXANDRE B. Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism Anais da Academia Brasileira de Ciências, vol. 89, núm. 3, julio-septiembre, 2017, pp. 1543-1553 Academia Brasileira de Ciências Rio de Janeiro, Brasil Available in: http://www.redalyc.org/articulo.oa?id=32752675014 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Anais da Academia Brasileira de Ciências (2017) 89(3): 1543-1553 (Annals of the Brazilian Academy of Sciences) Printed version ISSN 0001-3765 / Online version ISSN 1678-2690 http://dx.doi.org/10.1590/0001-3765201720150378 www.scielo.br/aabc | www.fb.com/aabcjournal Spider species richness and sampling effort at Cracraft´S Belém Area of Endemism BRUNO V.B. RODRIGUES1, MANOEL B. AGUIAR-NETO2, UBIRAJARA DE OLIVEIRA3, ADALBERTO J. SANTOS3, ANTONIO D. BRESCOVIT1, MARLÚCIA B. MARTÍNS2 and ALEXANDRE B. BONALDO2 1Instituto Butantan, Laboratório Especial de Coleções Zoológicas, Av. Vital Brasil, 1500, 05503-900 São Paulo, SP, Brazil 2Museu Paraense Emílio Goeldi, Coordenação de Zoologia, Avenida Perimetral, 1901, Caixa Postal 399, 66077-530 Belém, PA, Brazil 3Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Zoologia, Av. Antonio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil Manuscript received on June 19, 2015; accepted for publication on March 18, 2016 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. Key words: Amazon, araneae, diversity, fragmentation. INTRODUCTION et al. 2011a). The Amazon Basin in particular is still largely unknown regarding spider species richness Spiders are both highly abundant and diverse and composition and the available samples from organisms. There are above 46.000 species this region came mostly from easily accessible described (World Spider Catalog 2017), but these areas (Heyer et al. 1999, Oliveira 2011), as already figure is presumed to represent only a fraction of observed for Amazonian plants (Nelson et al. 1990, the actual species diversity of the group (Costello Hopkins 2007) and birds (Vale and Jenkins 2012). et al. 2012). Additionally, the taxonomic and Several spider inventories have been done in biogeographic knowledge on the spiders is biased recent years in Brazilian Amazonia (Bonaldo et al. both taxonomically and geographically (Brescovit 2009a, b, Ricetti and Bonaldo 2008, Bonaldo and Correspondence to: Bruno Vinicius Bastos Rodrigues Dias 2010, Dias and Bonaldo 2012, Venticinque E-mail: [email protected] et al. 2007). However, despite these efforts, large An Acad Bras Cienc (2017) 89 (3) 1544 BRUNO V.B. RODRIGUES et al. portions of the Amazon Basin remain undersampled large region stretching from the State of Maranhão and the checklists provided were mostly based in to the State of Acre (Ferreira et al. 2005), which the recognition of morphospecies, a situation that concentrates most of the logging and agricultural severely limits the study of biogeographic patterns. activities in the Brazilian Amazonia (Costa and The Amazon Basin presents high Pires 2010). landscape heterogeneity, with several distinct As indicated above, the delimitation of phytophysiognomies that offer a myriad of Amazonian areas of endemism is based on different habitats (Silva et al. 2005). Studies on vertebrate distribution data. The distribution of biogeography of vertebrates (Haffer 1978 [birds], lesser-known taxonomic groups, like arthropods, is Ávila-Pires 1995 [lizards], Silva and Oren 1996 still virtually unknown for the entire Amazon basin, [primates], Ron 2000 [amphibians]) indicated that except for studies based on butterflies (Brown et the distribution of several species in the Amazon al. 1995, Racheli and Racheli 2004). Considering Basin is not continuous and proposed that the similar that arthropods represent the majority of animal patterns of limited distribution of these vertebrates species on Earth, filling this knowledge gap seems could lead to the recognition of areas of endemism. to be an urgent task for the effective conservation According to these authors, eight to ten areas of of Amazonian biota. Thus, this study provides a endemism can be delimited within the Amazon faunistic list of spiders from the BAE, with data Basin. These areas of endemism are separated by compiled from all available sources, including the main river systems, which supposedly acted ordinary material from museum collections as well as effective physical barriers for these animals and as data from primary taxonomic and biodiversity lead to vicariant events of speciation (Haffer and survey literature. Furthermore, we map the species Prance 2002 – but see Oliveira et al. 2015). richness and sampling effort of spiders in the BAE. The Belém Area of endemism (BAE), We restrict the list to the specimens that were proposed by Cracraft (1985) based on historical identified down to species, since non-identified biogeography of avifauna, represent unique morphospecies distribution could not be accessed in homogeneous ecoregion, originally covered by large geographic scale without examining primary dense ombrophyllous Amazonian forest. This is the most threatened of the areas of endemism proposed specimens. Thus, the list represents only a portion by Cracraft (1985) for the Amazon Basin, suffering of the sampling at hand, and is obviously just a with habitat loss caused by deforestation, fire and fraction of the actual spider species richness in the fragmentation (Silva et al. 2005). In the last 400 area. Considering that the rate of success of species years, the BAE has undergone great landscape identification in structured inventories carried on in transformations, being currently formed by a east Amazonia fluctuates between 25% and 35%, mosaic of forest remnants. Most of these remnants we estimate that the list below represents nearly are covered by relatively young secondary forest, 30% of all species of the BAE available in the since nearly half the deforestation within the BAE studied collections. However, that small portion is occurred in the last 30 years. The primary forest the only one that is readily comparable to similar remnants are restricted to a few large blocks, lists from other regions, reflecting the current represented by indigenous reservations, the Gurupi knowledge on taxonomy of Amazonian spiders. Biological Reserve and a few private areas (Almeida Gathering these data progressively for each of the and Vieira 2010). The BAE also comprises the areas of endemism recognized for the Amazon northern portion of the “arc of deforestation”, a basin could prove to be a necessary step towards An Acad Bras Cienc (2017) 89 (3) SPIDERS FROM BELÉM AREA OF ENDEMISM 1545 understanding how spiders are distributed in the verified the presence of these species in important region. species lists of the Neotropical region, especially in Amazon (Dias and Bonaldo 2012, Höfer MATERIALS AND METHODS and Brescovit 2001, Ricetti and Bonaldo 2008, Venticinque et al. 2008, Bonaldo et al. 2009a, b, The BAE is totally inserted in Brazilian territory, Brescovit et al. 2011a, Buckup et al. 2010). Thus, located in the physiographic zone that lie on east a species was only considered potentially endemic of State of Pará and west of State of Maranhão, 2 if recorded so far only for the BAE, being absent in comprising 243.753,18 Km , located between 00º the verified databases and species list. 30’ and 06º 00’ S and 44º 00’ and 50º 00’ W (Figure To access the current state of knowledge of 1a). The BAE includes 27 conservation units and spider species richness in the BAE, the number 14 indigenous lands in 149 municipalities, 69 and density of distribution records were used as of which in Pará and 80 in Maranhão (Almeida indicators of sampling effort. The spatial variation and Vieira 2010). The vegetation is composed of the sampling effort and species richness was mainly of Dense Ombrophyllous Forest and areas expressed in maps with 0.25°grid cells. This size of characterized by different types of use. It also has grid cells was considered ideal because raster maps two main climate areas, the humid equatorial with with larger grid cells would not reveal collecting annual average rainfall greater than 2.000 mm, and gaps. Grid cells were classified regarding the the tropical equatorial zone with annual average number of records and species into five categories rainfall of 1.500 mm. The relief is composed by according to the natural gaps in their distribution, plateaus, depressions and plains (Almeida et al. which ranks values in ranges with the greatest 2013). variation, calculated using DIVA-GIS (Hijmans et A list of spider species recorded in the BAE al.
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