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Minimizing the Wallacean shortfall: a small sample reveals new occurrences of ground-dwelling spiders in native Cerrado and exotic pastures in the Midwestern Brazil

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Abstract

Spiders have gained wide acceptance in ecological studies as indicators of environmental quality because they show a strong preference for habitat type and pattern of land use. Knowledge of the spider community in Neotropical landscapes is still incipient. In order to decrease such lack of knowledge, this study provides information on the ground-dwelling spider assemblages in remnants of native Brazilian Cerrado (savanna woodlands) and in exotic pastures (Urochloa spp.; Poaceae). We collected the spiders in two remnants of native vegetation and in four exotic pastures using pitfall traps in Aquidauana, Mato Grosso do Sul, Midwestern Brazil. A total of 141 adults were captured, belonging to 11 families and 22 species of spiders (Arachnida: Araneae). Sixteen species were found in the exotic pastures, 10 in the Brazilian Cerrado, and only four were common to both habitats. We found higher species richness in exotic pastures when compared to Brazilian Cerrado. In addition, four spider species were reported for the first time in the state of Mato Grosso do Sul: Apopyllus silvestrii (Simon, 1905) (Gnaphosidae) sampled in exotic pastures, and Eilica rufithorax (Simon, 1893) (Gnaphosidae), Lycosa inornata Blackwall, 1862 (Lycosidae) and Oxyopes salticus (Hentz, 1845) (Oxyopidae) captured in the remnants of native vegetation. With these results, we minimize the Wallacean shortfall by increasing knowledge on distribution of spiders in remnants of native Cerrado and exotic pastures in the Midwestern Brazil. Moreover, we demonstrate that the ground-dwelling spider assemblage is rich and abundant in exotic pastures, a structurally poor and homogeneous habitat compared to the native vegetation of the Brazilian Cerrado. Then, our findings may aid in understanding the complexity of effects generated by mixed ecosystems on this group of predatory arthropods widely used as bioindicators of environmental and land use changes.

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Acknowledgements

We thank Agenor Martinho Correa for the logistical support, Jorge A de Deus Ricardo (Universidade Estadual de Mato Grosso do Sul, Aquidauana, Mato Grosso do Sul, Brazil) for field support, and two anonymous reviewers for the fruitful and helpful comments on previous version of this manuscript; Mrs. Gélio Proença Brum and Marcos Crestani for access to their properties. CMAC received a PhD scholarship from the Conselho Nacional de Desenvolvimento Científico Tecnológico (CNPq, Brazil) (140741/2015-1) in the Entomology Graduate Program, Universidade Federal de Lavras, and PhD sandwich scholarship from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) (88881.134292/2016-01).

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Correspondence to César M. A. Correa.

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The experimentation was no invasive and complied with Brazilian law. At the end of the experiment, the voucher specimens were deposited at the “Arachnid Collection, Departamento de Zoologia, Universidade de Brasília [UnB]” following standard procedures.

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There are no conflicts of interest (financial and non-financial) among authors.

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There were no humans participants on the study and thus, no ‘informed consent’ was required.

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Correa, C.M.A., Puker, A., Rodrigues, V.B. et al. Minimizing the Wallacean shortfall: a small sample reveals new occurrences of ground-dwelling spiders in native Cerrado and exotic pastures in the Midwestern Brazil. Int J Trop Insect Sci 41, 875–882 (2021). https://doi.org/10.1007/s42690-020-00197-6

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  • DOI: https://doi.org/10.1007/s42690-020-00197-6

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