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Taphonomy and ecology of modern avifaunal remains from Amboseli Park, Kenya

Published online by Cambridge University Press:  08 April 2016

Anna K. Behrensmeyer ,
C. Tristan Stayton  and
Ralph E. Chapman
Anna K. Behrensmeyer
Affiliation:
Department of Paleobiology, National Museum of Natural History, Box 37012, Smithsonian Institution, Washington, D.C. 20013-7012. E-mail: behrensmeyer.kay@nmnh.si.edu
C. Tristan Stayton
Affiliation:
Department of Geology and Geophysics, University of Chicago, 5734 South Ellis Avenue, Chicago, Illinois 60637
Ralph E. Chapman
Affiliation:
Applied Morphometrics Laboratory, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560-0121. E-mail: chapman.Ralph@nmnh.si.edu
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Abstract

Avian skeletal remains occur in many fossil assemblages, and in spite of small sample sizes and incomplete preservation, they may be a source of valuable paleoecological information. In this paper, we examine the taphonomy of a modern avian bone assemblage and test the relationship between ecological data based on avifaunal skeletal remains and known ecological attributes of a living bird community. A total of 54 modern skeletal occurrences and a sample of 126 identifiable bones from Amboseli Park, Kenya, were analyzed for weathering features and skeletal part preservation in order to characterize preservation features and taphonomic biases. Avian remains, with the exception of ostrich, decay more rapidly than adult mammal bones and rarely reach advanced stages of weathering. Breakage and the percentage of anterior limb elements serve as indicators of taphonomic overprinting that may affect paleoecological signals. Using ecomorphic categories including body weight, diet, and habitat, we compared species in the bone assemblage with the living Amboseli avifauna. The documented bone sample is biased toward large body size, representation of open grassland habitats, and grazing or scavenging diets. In spite of this, multidimensional scaling analysis shows that the small faunal sample (16 out of 364 species) in the pre-fossil bone assemblage accurately represents general features of avian ecospace in Amboseli. This provides a measure of the potential fidelity of paleoecological reconstructions based on small samples of avian remains. In the Cenozoic, the utility of avian fossils is enhanced because bird ecomorphology is relatively well known and conservative through time, allowing back-extrapolations of habitat preferences, diet, etc. based on modern taxa.

Type
Articles
Information
Paleobiology , Volume 29 , Issue 1 , Winter 2003 , pp. 52 - 70
Copyright
Copyright © The Paleontological Society 

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