Climatic Variables Do Not Directly Predict Spider Richness and Abundance in Semiarid Caatinga Vegetation, Brazil

Environmental Entomology
Leonardo S CarvalhoA Vasconcellos

Abstract

Spiders are abundant in tropical ecosystems and exert predatory pressure on a wide variety of invertebrate populations and also serve as prey for many others organisms, being part of complex interrelationships influenced directly and indirectly by a myriad of factors. We examined the influence of biotic (i.e., prey availability) and abiotic (i.e., temperature, precipitation, relative humidity, real evapotranspiration) factors on species richness and abundance during a two-year period in the semiarid Caatinga vegetation in northeastern Brazil. Data were analyzed through partial autocorrelation functions, cross correlations, and a path analysis. A total of 2522 spiders were collected with beating tray, pit-fall traps, and malaise traps, comprising 91 species and 34 families. Spider abundance peaked in the rainy season. Our results suggest that total invertebrate abundance has a direct influence on spider richness and abundance, whereas the effects of precipitation were mainly indirectly related to most spider assemblage parameters. The increase in vegetation cover with the rainy season in the Caatinga provides more breeding and foraging sites for spiders and stimulates their activities. Additionally, rainfall in arid and semiarid...Continue Reading

References

Mar 14, 2007·Neotropical Entomology·Arrilton Araújo, Zenilde Rodrigues
May 14, 2010·Proceedings. Biological Sciences·David E JenningsJason R Rohr
Dec 1, 2010·Brazilian Journal of Biology = Revista Brasleira De Biologia·V F P AraújoA Vasconcellos
Aug 1, 1995·Oecologia·David A Spiller, Thomas W Schoener

Citations

Mar 12, 2020·Environmental Entomology·Kapilkumar IngleRóbert Gallé

Related Concepts

Metazoa
Climate
Brachiopoda
Underpopulation
Rain
Seasonal Variation
Spiders
Biomass
Food Web
Biodiversity

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