Carlos De Angelo*, Agustín Paviolo and Mario Di Bitetti
Aim Jaguars and pumas, being similar in size and behaviour, are the largest felids of the Neotropics. However, pumas appear to be more resistant to human impacts. Our objective was to compare the response of both species with human impacts at a regional scale in a highly modified region where both species had continuous distribution in the past.
Location The Upper Parana Atlantic Forest (UPAF).
Methods Pumas and jaguars presence-only data were used in an Ecological Niche Factor Analysis (ENFA). From the total number of records, we resampled 95 records of each species 10 times to characterize and compare their habitat requirements, built habitat-suitability maps and examined interspecific differences in niche parameters related to present landscape characteristics.
Results Both species showed high dependence on native forest and habitat protection, and low tolerance to anthropogenic environments. However, jaguars showed higher differences between their optimal habitat and the available landscape (mean ± SD; marginality M = 2.290 ± 0.072) and lower tolerance to deviations from their optimal habitat (tolerance T = 0.596 ± 0.013) than pumas (M = 1.358 ± 0.067, P < 0.001; T = 0.742 ± 0.022, P < 0.001). Although their niches highly overlapped (Pianka’s O = 0.746 ± 0.069), pumas’ higher tolerance
resulted in a larger area covered by suitable patches of habitat with higher connectivity. All jaguar-suitable areas were also suitable for pumas; however, 44 ± 8% of puma-suitable areas were unsuitable or marginal for jaguars.
Main conclusions Pumas showed more tolerance than jaguars to human impacts at a regional scale in the UPAF, a pattern also observed at local and continental scales. Although the proximate factors responsible for the differential response of pumas to human-altered environments seem to be similar at all spatial scales (e.g. broader trophic niche than jaguars), the resultant spatial configuration of suitable habitat at a regional scale might be another important factor determining puma persistence and higher jaguar demands on conservation efforts.
Keywords Conservation biogeography, Ecological Niche Factor Analysis, habitat suitability, niche breadth, response to human pressures, tolerance.
*Correspondence: Carlos De Angelo, National Research Council (CONICET), Instituto de Biología Subtropical, Facultad de Ciencias Forestales, Universidad Nacional de Misiones and Asociación Civil Centro de Investigaciones del Bosque Atlántico (CeIBA), Andresito 21 (N3370AIA), Puerto Iguazú , Misiones, Argentina. E-mail: email@example.com
PDF De Angelo et al 2011- Impact of landscape transformation on pumas and jaguars.pdf