title: Stable isotope canopy effects for sympatric monkeys at Tai Forest, Cote d'Ivoire.
abstract: This study tests the hypothesis that vertical habitat preferences of different monkey species inhabiting closed canopy rainforest are reflected in oxygen isotopes. We sampled bone from seven sympatric cercopithecid species in the Taï forest, Côte d'Ivoire, where long-term study has established taxon-specific patterns of habitat use and diet. Modern rib samples (n = 34) were examined for oxygen (δ(18)Oap) and carbon (δ(13)Cap) from bone apatite ('bioapatite'), and carbon (δ(13)Cco) and nitrogen (δ(15)Nco) from bone collagen. Results are consistent for C3 feeders in a closed canopy habitat. Low irradiance and evapotranspiration, coupled with high relative humidity and recycled CO2 in forest understory, contribute to observed isotopic variability. Both δ(13)Cco and δ(13)Cap results reflect diet; however, δ(13)C values are not correlated with species preference for canopy height. By contrast, δ(18)Oap results are correlated with mean observed height and show significant vertical partitioning between taxa feeding at ground, lower and upper canopy levels. This oxygen isotope canopy effect has important palaeobiological implications for reconstructing vertical partitioning among sympatric primates and other species in tropical forests.
authors.affiliation: Department of Anthropology, University of Florida, 1112 Turlington Hall, Gainesville, FL 32611, USA. krigbaum@ufl.edu
authors.forename: John
authors.initials: J
authors.lastname: Krigbaum
authors.forename: Michael H
authors.initials: MH
authors.lastname: Berger
authors.forename: David J
authors.initials: DJ
authors.lastname: Daegling
authors.forename: W Scott
authors.initials: WS
authors.lastname: McGraw
mesh_terms: D000818:Animals; D002247:Carbon Isotopes / Q000378:metabolism; D002520:Cercopithecidae / Q000502:physiology*; D003094:Collagen / Q000737:chemistry; D007560:Cote d'Ivoire; D004032:Diet; D017753:Ecosystem; D005247:Feeding Behavior; D009587:Nitrogen Isotopes / Q000378:metabolism; D010103:Oxygen Isotopes / Q000378:metabolism; D012272:Ribs / Q000737:chemistry; D013045:Species Specificity
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D010103:Oxygen Isotopes; D003094:Collagen
keywords: bioapatite; bone collagen; carbon; cercopithecid; oxygen