Abstract
Humans are promoting drastic changes in biological communities that result in ‘winner-loser’ species replacements across multiple spatial scales. In tropical regions, such replacements can be particularly driven by deforestation, especially in landscapes devoted to free-ranging livestock production in which mixing native and exotic species can create species-poor and homogenized communities. We tested this hypothesis assessing medium- and large-bodied non-volant mammals in four 16-km2 landscapes with varying deforestation levels (5%, 30%, 70%, and 95% forest cover), where exotic mammals (e.g., cows and goats) have free access to the remaining Caatinga dry forest. Using camera traps, we obtained 2808 independent records of 17 species, most of them (2054 records, 73%) corresponding to seven exotic species. Native Cerdocyon thous (crab-eating fox) and exotic Capra hircus (goat) accounted for almost half of the records and 60–80% of the records in the two most deforested landscapes. Alpha diversity did not differ significantly among landscapes, but the two more forested landscapes tended to have more native species than exotic ones. Beta diversity patterns among and within landscapes were relatively low regardless of species abundance, indicating biotic homogenization at multiple spatial scales. We conclude that a novel mammal community full of exotic mammals and a few generalist natives has been established in the study region. To promote environmental-friendly livestock farming in the largest tropical dry forest of South America, we should avoid deforestation, especially in sites that concentrate native species, segregate lands for livestock and conservation, and boost inspection against illegal hunting.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledments
We are grateful to Janilma Silva and Luana Figueiredo for essential field assistance. We also thank an anonymous reviewer for critical comments on previous versions of this manuscript.
Funding
This study was supported by Rufford Foundation (Grant number 20547-2), IdeaWild (ALVEBRAZ1016), National Council for Scientific and Technological Development (CNPq Grant number 441436/2017-0), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brazil (CAPES, graduate scholarship to TSA and a postdoctoral fellowship to FA). BAS is grateful to CNPq (Grant number 312178/2019-0), Universidade Federal da Paraíba (Grant number PVA-13357-2020) and CAPES (Programa CAPES/PrInt/UFPB) for research grants.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by TSA and FA. The first draft of the manuscript was written by BAS and VAR and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Alves, T.S., Alvarado, F., Arroyo-Rodríguez, V. et al. Foxes and goats: the outcome of free-ranging livestock farming in Brazilian dry forests. Biodivers Conserv 32, 715–734 (2023). https://doi.org/10.1007/s10531-022-02520-8
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DOI: https://doi.org/10.1007/s10531-022-02520-8