Diversity and seasonal abundance of anthropogenic spiders (Arachnida: Araneae) in different urban zones of the city of Chilpancingo, Guerrero, Mexico

Abstract

The diversity of anthropogenic spiders in the city of Chilpancingo, Guerrero, Mexico was studied using a systematized collection method in 4 sampling zones: urban with a garden, urban without a garden, suburban, and rural. The total species richness was 63 morphospecies, 49 genera and 21 families. The family Theridiidae had the highest diversity (22 species). The total abundance of spiders was 4,120 individuals, with the highest abundance in the urban zone with a garden (1,163 individuals). The most abundant species were: Physocyclus globosus (1,998 individuals) (Pholcidae), Oecobius navus (1,388) (Oecobidae), Nesticodes rufipes (313) (Theridiidae), Filistatoides sp.1 (83) (Filistatidae), and Dictyna jacalana (52) (Dictynidae). The abundance of spiders found on the first story of the 16 sampled houses was higher than the abundance of spiders found on the second one. The morphospecies richness was higher for spiders from the first story than those from the second one and higher in the rainy season than in the dry season. The highest diversity of spiders was found in the urban zone with a garden, both in the rainy and dry seasons. Based on the Morisita-Horm index, the urban zone with a garden and the suburban zone were the most similar in terms of spider diversity. The species accumulation curves are still a useful tool to evaluate sampling quality and compare inventories of mega-diverse groups, such as spiders.

To boldly go: on invasive goblin spiders in Brazil (Araneae, Oonopidae)

“…Invasions of alien spiders on the Neotropical Region are yet poor studied. Most of the available papers are descriptive (Carvalho et al, 2007;Almeida-Silva & Brescovit, 2008;Ott & Brescovit, 2013;Pompozzi et al, 2013;Ruiz & Bonaldo, 2013;Taucare-Ríos & Bustamante, 2015) and just a few deals with the relations of the studied species with their environments (Malumbres-Olarte, 2015;Rodríguez-Rodríguez et al, 2015). Nevertheless, the handful studies carried on in Brazil have been showing a large number of invasive or synanthropic spiders and the list of those spiders in Brazilian territory depicts today at least fifty species (Brescovit, 2002;Indicatti & Brescovit, 2008;Simó et al, 2015).…”

Spiders of the Orbiculariae clade (Araneae: Araneomorphae) from Calakmul municipality, Campeche, Mexico

“…The sampling was conducted in the rainy season because this is when an increase in the abundance and richness of spiders has been reported in other studies in Mexico (Rodríguez-Rodríguez, Solís-Catalán, & Valdez-Mondragón, 2015;Valdez-Mondragón, 2006). Also, the reproduction of most of the species occurs in this season, being a period where the presence of food is constant (Nogueira, Pinto da Rocha, & Brescovit, 2006).…”

Arañas (Arachnida: Araneae) Asociadas a Formaciones Vegetales en El Refugio De Vida Silvestre Pantanos De Villa, Lima, Perú

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