Illinois State Archaeological Survey Calendar

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Event Detail Information

Dr. Justin Congdon - Savannah River Ecology Lab

Date Apr 9, 2013
Time 3:00 pm  
Location 1816 S. Oak St Champaign, IL
Sponsor Illinois Natural History Survey
Event type Lecture
Views 12263

Evolution of Life Histories, Indeterminate Growth, and Perceptions of Age in Turtles

The singular life-history trait of attaining maturity combined with the relative contributions of juvenile and adult growth combine to shape the suite of life-history traits of organisms with indeterminate growth.  Although the assumption that indeterminate growth is a general trait of reptiles is widely accepted, data are scarce (particularly for long-lived individuals.)

We examined patterns of variation in adult growth using over a hundred years of mark-recapture data on 13 populations of 9 species (3 families) of freshwater turtles from studies in South Carolina, Michigan, and Arizona in the USA and in Ontario, Canada.  The influence of growth on life-history trait values indicated that increases in body size (and associated reproductive output) resulting from indeterminate growth are not substantial enough to represent a major factor in the evolution of life histories in general or the evolution of longevity and aging specifically.


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