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The Short-Term Effects of Hurricane Richard on the Diet, Behaviour, and Sub-Grouping Patterns of Spider Monkeys (Ateles geoffroyi) at Runaway Creek Nature Reserve, Belize Jane Champion 1, Kayla Hartwell 1, Mary Pavelka 1, and Hugh Notman 1 & 2 1 University of Calgary and 2 Athabasca University, Alberta, Canada
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Hurricane Richard October 25, 2010 Category 2 hurricane Winds up to 155 kph Runaway Creek Nature Reserve directly in path $80 million (US) damage Belize Weather Center
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Runaway Creek Nature Reserve Belize Protected Areas RCNR
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Hurricane Richard damage at RCNR Damage assessment: – 42.8% major damage – 27.6% minor damage – 29.6% no observable damage
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Hurricane Iris Monkey River, Belize October 8, 2001 Category 4 hurricane Top winds 230 kph www.NOAA.com
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Hurricane Iris 100% forest defoliation No fruit available for 18 months Diet switched to total folivory Increase in time spent inactive Decrease in social behaviour
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Results Dramatic reduction in population density, group size, and fruit availability/consumption
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Objective of this Presentation Document short-term effects of Hurricane Richard on Runaway Creek Nature Reserve spider monkey population, diet, activity, and subgroup size and stability.
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Predictions 1. Population losses 2. A change in diet, which will reflect changes in food availability – Lower fruit consumption – Increase consumption of leaves and fallback foods 3. A change in activity budgets – More time dedicated to traveling – Less time spent in social activities 4. Reduced sub-group size
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Methods 10 minute focal samples on adults and subadults Instantaneous subgroup scans every 30 minutes Subgroup composition changes recorded via ad libitum sampling 4 months pre- and 3 months post-hurricane data used – 35 field days during each period (70 days total)
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AdultSubadultJuvenileInfant Male5253 Female13261 Total individuals: 37 All individuals accounted for in 3 months post- hurricane 3 births between December 2010 and January 2011 Results: Population Changes Group composition as of January 2011
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Results: Diet Taken from all instantaneous subgroup scan samples Paired t-tests Less ripe fruit (p<0.001) More flowers (p=0.015), leaves (p<0.001), and unripe fruit (p<0.001) * * * * Mean proportion of feeding activity
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Results: Activity Taken from all instantaneous subgroup scan samples Paired t-tests More time feeding (p=0.001), and in social activities (p=0.023) * * Mean proportion of activities
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Results: Subgroup Size Taken from all focal and scan samples Paired t-tests Average subgroup per day decreased (p=0.026) * Mean number of individuals per subgroup per day
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Results: Subgroup Stability Collected ad libitum during subgroup follows Paired t-tests Both fissions (p=0.005) and fusions (p=0.014) per hour decreased * * Mean frequency of fissions/fusions per observation hours
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Summary of short term-effects of the hurricane 1.No population losses 2.Evidence of dietary flexibility 3.Minor changes to activity budget 4.Evidence of grouping flexibility toward smaller, more stable subgroups
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Implications and directions for research Spider monkeys more resilient to major habitat disturbance than expected, at least in the short-term. Support some of the findings reported for Hurricanes Emily and Wilma (Rebecchini et al) Future research is required to examine forest regeneration in more detail and the long-term effects of these changes to spider monkeys and other primate species
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Acknowledgements Project supervisors: Mary Pavelka and Hugh Notman Co-author: Kayla Hartwell Field support: Stevan Reneau and Gilroy Welch Statistical support: Dr. Tak Fung Natural Sciences and Engineering Research Council of Canada, National Geographic Society, The University of Calgary
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