Abstract

MALDONADO-CARRIZALES, Juan; PONCE-SAAVEDRA, Javier  and  VALDEZ-MONDRAGON, Alejandro. Species richness and abundance of spiders (Arachnida: Araneae) in western urban environments and its contiguous vegetation from Morelia City, Michoacán, Mexico. Rev. Mex. Biodiv. [online]. 2021, vol.92, e923650.  Epub Feb 03, 2022. ISSN 2007-8706.  https://doi.org/10.22201/ib.20078706e.2021.92.3650.

In the west of the city of Morelia, Michoacán, Mexico, 3 urban localities with similar type of housing construction, but different in time since their construction were sampled monthly for a year to study the richness and abundance of spiders. Four additional samples were also made in adjacent vegetation. The localities were called: “old”, “medium” and “young”. Through direct hand-picking, pit-fall traps, and beating sheets, 7,065 spiders were captured; 4,281 (721 ♀♀, 369 ♂♂ and 3,191 immature) determined in 23 families, 48 genera and 54 species. There was a statistical difference in the ratio of adult/immature abundance between urban locations (χ2 = 38.825; p < 0.0001). ANOSIM did not detect a significant difference among localities due to the time they were built (R = 0.009; p = 0.167); but a trend of change due to the time elapsed since its construction is recognized. The abundance by species was different between the old housing development with the young (p = 0.028) and the adjoining vegetation (p = 0.049). The family Salticidae (22 species) and the genus Sassacus (4) presented greater richness, while Filistatinella kahloae (663 individuals) was the most abundant species. Microlinyphia dana represents new genus and species records for Mexico.

Keywords : Synanthropic spiders; Diversity; Inventory; New records; Indicator species.

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