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Assessing age in the desert tortoise Gopherus agassizii: Testing skeletochronology with individuals of known age

Endangered Species Research

By:
, , ,
DOI: 10.3354/esr00108

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Abstract

Eight desert tortoises Gopherus agassizii from a long-term mark-recapture study in the Mojave Desert, Nevada, USA, afforded an opportunity to examine the accuracy of skeletochronological age estimation on tortoises from a seasonal, yet environmentally erratic environment. These 8 tortoises were marked as hatchlings or within the first 2 yr of life, and their carcasses were salvaged from predator kills. Using d blind protocol, 2 skeletochronological protocols (correction-factor and ranking) provided age estimates for a set of 4 bony elements (humerus, scapula, femur, ilium) from these tortoises of known age. The age at death of the tortoises ranged from 15 to 50 yr. The most accurate protocol - ranking using the growth layers within each of the 4 elements - provided estimates from 21 to 47 yr, with the highest accuracy from the ilia. The results indicate that skeletochronological age estimation provides a reasonably accurate method for assessing the age at death of desert tortoises and, if used with a large sample of individuals, will provide a valuable tool for examining age-related mortality parameters in desert tortoise and likely in other gopher tortoises (Gopherus). ?? Inter-Research 2008.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Assessing age in the desert tortoise Gopherus agassizii: Testing skeletochronology with individuals of known age
Series title:
Endangered Species Research
DOI:
10.3354/esr00108
Volume
5
Issue:
1
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
21
Last page:
27
Number of Pages:
7