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A catastrophic kill of ice-trapped coots: time-averaged versus scavenger-specific disarticulation patterns

Published online by Cambridge University Press:  08 February 2016

James S. Oliver  and
Russell W. Graham
James S. Oliver
Affiliation:
Research and Collections Center, Illinois State Museum, 1011 East Ash Street, Springfield, Illinois 62703
Russell W. Graham
Affiliation:
Research and Collections Center, Illinois State Museum, 1011 East Ash Street, Springfield, Illinois 62703
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Abstract

More than 300 coots (Fulica americana) became frozen in Spring Lake, Tazewell County, Illinois, on December 1, 1985. This catastrophic event permitted 8 weeks of taphonomic observations, which showed that ice forms a stable substrate which permits terrestrial taphonomic processes to be imprinted on lacustrine deposits. Bird and mammal scavengers attacked coot carcasses in different manners, resulting in distinct disarticulation sequences. Bird scavengers preferentially fed on the head, neck, and breast-wing complex, causing early disarticulation of bones in these areas, late loss of hindlimb joints, and minimal bone damage. In contrast, mammal scavengers concentrated their attention on the hindlimb and tail region, resulting in bone breakage and early disarticulation of these body parts, but late disarticulation of the breast-wing complex. These data demonstrate that scavenger-specific feeding behaviors significantly influence disarticulation patterns early in assemblage formation, while anatomy may exert increasingly greater influence on disarticulation patterns as carasses become less attractive to scavengers. Finally, because taphonomic processes change in intensity and type through time, bone frequency and modification patterns will vary according to the time at which the patterns are arrested by burial. Thus, bone frequency and modification patterns should provide an index to the relative importance of specific biotic agents and of anatomy in fossil disarticulation patterns as well as an estimate of the time between death and burial.

Type
Articles
Information
Paleobiology , Volume 20 , Issue 2 , Spring 1994 , pp. 229 - 244
Copyright
Copyright © The Paleontological Society 

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