Abstract # 4334 Event # 121:

Scheduled for Friday, June 22, 2012 02:30 PM-03:45 PM: Session 19 (3rd Floor All Space) Oral Presentation


DEMOGRAPHIC CHARACTERIZATION OF OWL MONKEYS (AOTUS AZARAI AZARAI) IN GALLERY FORESTS AND FOREST ISLANDS OF THE ARGENTINEAN CHACO.

C. P. Juárez1, D. J. Clink2 and E. Fernandez-Duque1,3
1Centro de Ecología Aplicada del Litoral (CONICET), Formosa, Argentina, 2Department of Anthropology, University of California, Davis, 3Department of Anthropology, University of Pennsylvania
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     The objective of the current study was to compare demographic parameters of owl monkey populations living in continuous and naturally fragmented forest habitats in the Argentinean province of Formosa. Populations were monitored in two locations, Estancia Guaycolec and Río Pilcomayo National Park, between 2006 and 2011. In Estancia Guaycolec there were 14 groups in continuous gallery forests and 16 groups in forest islands. In Río Pilcomayo National Park there were 20 groups in gallery forests and 16 groups in forest islands. Group size between sites and forest types was comparable (Estancia Guaycolec T-test: 3±0.9; p=0.13; n=12; Rio Pilcomayo T-Test: p= 0.18; n=14; x=3.7±0.8). Group structure was typical, with groups consisting of two adults, juveniles and infants. Groups in gallery forests had a higher proportion of juveniles than groups in forest islands (Randomization test: EG=p=0.011 and PN=p=0.03). There was a higher percentage of births in gallery forests, and population density was also higher (EG: gallery=13.9 ind/km2; island=8.9 ind/km2; PN: gallery=28.8 ind/km2; island=9.3 ind/km2). This is the first study to report on population dynamics of owl monkeys in Río Pilcomayo National Park, the only national park in Argentina that contains owl monkey populations. It is also the first study to investigate owl monkey metapopulation dynamics in a naturally fragmented landscape.