Abstract # 4243 Poster # 62:

Scheduled for Thursday, June 21, 2012 07:00 PM-09:00 PM: Session 9 (Gardenia) Poster Presentation


SPATIAL DISTRIBUTION OF COMMON MARMOSET (CALLITHRIX JACCHUS) GOUGE TREES AT TAPACURÁ FIELD STATION, BRAZIL

C. L. Thompson1, N. J. Robl2, L. C. Melo3, M. M. Valença-Montenegro4, Y. M. Valle5, M. B. Oliveira5 and C. J. Vinyard1
1Northeast Ohio Medical University, Department of Anatomy & Neurobiology, Rootstown, OH, USA, 2School of Veterinary Medicine, University of Wisconsin, 3Parque Dois Irmãos, 4Centro Nacional de Pesquisa e Conservação de Primatas Brasileiros do Instituto Chico Mendes de Conservação da Biodiversidade, 5Laboratório de Ecofisiologia e Comportamento Animal do Departamento de Morfologia e Fisiologia Animal da Universidade Federal Rural de Pernambuco
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     Marmosets routinely gouge trees to acquire exudates. These gouges provide long-term evidence of resource exploitation. We tested whether trees gouged by free-ranging common marmosets displayed a clumped, uniform, or random distribution within the marmosets’ home ranges. We additionally tested whether gouged trees were spatially concentrated in home range centers where groups can more easily maintain exclusive access to exudate resources. Gouged trees (n=145) at Tapacurá Field Station, Pernambuco, Brazil were identified by walking systematic transects and recording locations via GPS. Using ArcView, known home ranges of five groups within the sample area were georeferenced onto the location of gouged trees. Gouged trees were significantly closer to one another compared to a random distribution of points (t=-7.76, p<0.001) and showed higher variation in nearest neighbor distances than expected for a uniform distribution (CV=95.9%). Although gouged trees were not systematically located near home range centers, they were significantly closer to centers than a random distribution of points (t=-2.83, p=0.005). Despite this, gouged trees near home range centers were not more intensely exploited than those in peripheral areas (X2=0.035, p=0.983). Our findings suggest that marmoset exploitation of exudate resources is spatially clumped. Additionally, there is minimal support for the hypothesis that marmosets exploit gouged trees that are centralized in their home ranges to reduce between-group resource competition. Supported by NSF(BCS-0094666), The National Geographic Society, and The Leakey Foundation.