利用生长层组对已知年龄的加州海狮（）进行年龄测定的准确性和精确性。
Accuracy and precision of age determination using growth layer groups for California sea lions () with known ages.
作者信息
Rust Lauren B, Danil Kerri, Melin Sharon R, Wilkerson Brent
机构信息
The Marine Mammal Center, 2000 Bunker Road, Sausalito, California 94965, U.S.A.
Southwest Fisheries Science Center, NMFS, NOAA, 8901 La Jolla Shores Drive, La Jolla, California 92037, U.S.A.
出版信息
Mar Mamm Sci. 2019 Oct;35(4):1355-1368. doi: 10.1111/mms.12605. Epub 2019 Mar 19.
Age determination from counts of growth layer groups (GLGs) in tooth dentine is a common method for aging marine mammals. Using known-aged animals, we validated this method for acid etched teeth of California sea lions (CSLs), . Between 1991 and 2013, the upper left canine ( = 33) was collected opportunistically during necropsy from animals tagged or branded as pups that later died. Overall, 55%-61% of age estimates by GLG counting were within 1 yr of the known-age in the sample of 1-30-yr-old CSLs. Accuracy of age estimates was found to be dependent on age of the CSLs, however. 71%-79% of age estimates were within 1 yr of the known-age in CSLs <10 yr old. These findings support the validity of counting GLGs to estimate age for CSLs <10 yr old to within 1 yr of accuracy.
通过计算牙齿牙本质中生长层组（GLGs）来确定年龄是一种常用的海洋哺乳动物年龄测定方法。我们利用已知年龄的动物，对加利福尼亚海狮（CSLs）酸蚀牙齿的这种方法进行了验证。1991年至2013年期间，在尸检时从标记或烙印过的幼崽且后来死亡的动物身上，随机收集左上犬齿（n = 33）。总体而言，在1至30岁的CSLs样本中，通过GLG计数得出的年龄估计值有55% - 61%在已知年龄的1年范围内。然而，发现年龄估计的准确性取决于CSLs的年龄。在年龄小于10岁的CSLs中，71% - 79%的年龄估计值在已知年龄的1年范围内。这些发现支持了通过计数GLGs来估计10岁以下CSLs年龄且准确性在1年以内的有效性。
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