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1 February 2015 Climatic Variables Do Not Directly Predict Spider Richness and Abundance in Semiarid Caatinga Vegetation, Brazil
Leonardo S. Carvalho, Nicholas Sebastian, Helder F. P. Araújo, Sidclay C. Dias, Eduardo Venticinque, Antonio D. Brescovit, Alexandre Vasconcellos
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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, pitfall 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 ecosystems stimulated the activity and reproduction of many herbivore and detritivore invertebrates dependent on plant biomass and necromass consumption, leading to an increase in spider prey availability.

© The Author 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email: journals.permissions@oup.com
Leonardo S. Carvalho, Nicholas Sebastian, Helder F. P. Araújo, Sidclay C. Dias, Eduardo Venticinque, Antonio D. Brescovit, and Alexandre Vasconcellos "Climatic Variables Do Not Directly Predict Spider Richness and Abundance in Semiarid Caatinga Vegetation, Brazil," Environmental Entomology 44(1), 54-63, (1 February 2015). https://doi.org/10.1093/ee/nvu003
Received: 2 June 2014; Accepted: 16 October 2014; Published: 1 February 2015
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KEYWORDS
assemblage structure
invertebrate
Neotropical Region
prey availability
Seasonality
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