Artigo Acesso aberto Revisado por pares

Modeling the effects of deforestation on the connectivity of jaguar Panthera onca populations at the southern extent of the species’ range

2017; Inter-Research; Volume: 34; Linguagem: Inglês

10.3354/esr00840

ISSN

1863-5407

Autores

Jeffrey J. Thompson, Marianella Velilla,

Tópico(s)

Primate Behavior and Ecology

Resumo

ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsSpecials ESR 34:109-121 (2017) - DOI: https://doi.org/10.3354/esr00840 Modeling the effects of deforestation on the connectivity of jaguar Panthera onca populations at the southern extent of the species' range Jeffrey J. Thompson1,2,*, Marianela Velilla1,2 1Guyra Paraguay, Av. Cnel. Carlos Bóveda, Parque Asunción Verde, Viñas Cué, Asunción, Paraguay 2Consejo Nacional de Ciencia y Tecnología (CONACYT), Justo Prieto 223 esq. Teófilo del Puerto, Barrio Villa Aurelia, Asunción, Paraguay *Corresponding author: jthompson.py@gmail.com ABSTRACT: We employed least-cost and circuit theory modeling to model the connectivity among previously defined Jaguar Conservation Units (JCUs) at the southern limit of the jaguar's range in Argentina, Bolivia, Brazil and Paraguay, in order to assess the effects of deforestation and land use change between 2000 and 2014. Due to uncertainty about possible limitations to jaguar dispersal, we examined connectivity where linkages were not cost-limited and limited to 1000 km cost-weighted distance. When linkage length was not cost-limited, total linkage area decreased by 9%, and mean least-cost distance and mean effective resistance increased by 6 and 31%, respectively, from 2000 to 2014. Limiting linkages to 1000 km cost-weighted distance indicated that the southern- and eastern-most JCUs were isolated as early as 2000 and that the number of linkages between the other JCUs decreased between 2000 and 2014, causing the linkage area to decrease by 27% while the least-cost distance of the remaining linkages increased by a mean of 4% and effective resistance increased on average by 44%. By limiting linkages to a plausible cost-weighted distance, we demonstrated that JCUs in the Atlantic Forest, Argentine Chaco and the Argentine/Bolivian Yungas have been isolated since at least 2000, and that there has been a loss of connectivity through eastern Bolivia, increased resistance in the remaining linkages and a constriction of all but one linkage to a minimum width of <8 km. Our results are consistent with an observed loss of genetic diversity in jaguar populations within portions of our study area and indicate a need for further research to better quantify jaguar dispersal. KEY WORDS: Jaguar · Panthera onca · Deforestation · Connectivity · Corridors · South America · Circuit theory · Least-cost distance Full text in pdf format PreviousNextCite this article as: Thompson JJ, Velilla M (2017) Modeling the effects of deforestation on the connectivity of jaguar Panthera onca populations at the southern extent of the species' range. Endang Species Res 34:109-121. https://doi.org/10.3354/esr00840 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in ESR Vol. 34. Online publication date: July 31, 2017 Print ISSN: 1863-5407; Online ISSN: 1613-4796 Copyright © 2017 Inter-Research.

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