Abstract # 164:

Scheduled for Sunday, September 14, 2014 07:00 PM-09:00 PM: Session 22 (Decatur B) Poster Presentation


R. K. Boner1, A. T. Garcia de la Chica1, S. M. van Kuijk1, M. Corley1,2, A. DiFiore3 and E. Fernandez-Duque1,4
1Fundacion ECO, Proyecto Mirikina, Casa 100, Ciudad de Formosa, Provencia de Formosa 3600, USA, 2University of Pennsylvania, 3University of Texas at Austin, 4Yale University
     The maternal relief hypothesis for the evolution of biparental care proposes that extensive paternal care reduces the reproductive and energetic burden of the female. We evaluate this hypothesis focusing on a genetically monogamous owl monkey population in Formosa, Argentina, where paternal care is substantial. We describe activity patterns and social proximity of pairmates before and after the birth of an infant using focal scan sampling. During the first field season of a 3-year study we collected 42 hours of data from three reproducing pairs two months before and two months after the birth season. Both parents spent more time moving (males: 18±8% vs 21±2%; females: 19±3% vs 22±2%) and less time foraging (males: 38±11% vs 23±9%; females: 38±6% vs 26±12%) after the birth of the infant suggesting a negative energetic balance due to the presence of an infant. Only females spent more time resting after the birth of an infant (males: 33±5% vs. 30±15%; females: 21±2% vs 31±14%) indicating a reduced energetic burden possibly afforded by paternal care. Pairmates spent more time in proximity in the presence of an infant than before the birth of one (males: 25% vs 37%; females: 31% vs 46%). Although the observed patterns suggest a reduction in energetic burden during biparental care that is consistent with the maternal relief hypothesis, larger sample sizes are required to validate these observed trends.