Estimating narwhal (Monodon monoceros) age using tooth layers and aspartic acid racemization of eye lens nuclei

被引:10
作者
Watt, Cortney A. [1 ,2 ]
Stewart, Barbara E. [3 ]
Loseto, Lisa [1 ,2 ]
Halldorson, Thor [1 ]
Ferguson, Steven H. [1 ,2 ]
机构
[1] Fisheries & Oceans Canada, Winnipeg, MB, Canada
[2] Univ Manitoba, Dept Biol Sci, Winnipeg, MB, Canada
[3] Sila Consultants, Howden, MB, Canada
关键词
AAR; aging; cetacean; GLG; growth layer groups; DELPHINAPTERUS-LEUCAS; GROWTH; TUSK;
D O I
10.1111/mms.12623
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Counting growth-layer groups (GLGs) in teeth is one of the most precise and widely accepted methods for aging marine mammals. Male narwhals have a large erupted tusk that can be used for aging, but this tusk is often difficult or expensive to obtain from hunters and most females do not display the tusk; thus, alternative methods for narwhal aging are needed. In this study, we aged narwhals by counting annual GLGs in embedded tusks and by measuring the change in the ratio of D- and L-enantiomers of aspartic acid in the eye lens nucleus that occurs as the animal ages (the aspartic acid racemization [AAR] technique). Absolute age estimates were estimated for seven tusks aged <= 15 yr. Estimated age was a significant predictor of aspartic acid D/L ratios with a racemization rate (K-asp) of 9.72 x 10(-4)/year +/- 2.28 x 10(-4) and a (D/L)(0) of 3.46 x 10(-2) +/- 1.78 x 10(-3) (r(2) = 0.74). Results from our study, which included more younger GLG-aged animals than previously evaluated, confirms AAR can be used to generate age estimates for narwhals.
引用
收藏
页码:103 / 115
页数:13
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