My co-authors and I are pleased to announce a new paper recently published in
Marine Mammal Science:
Accuracy and precision of age determination using growth layer groups for
California sea lions (Zalophus californianus) with known ages. LAUREN B. RUST
,1 The Marine Mammal Center, 2000 Bunker Road, Sausalito,California 94965,
U.S.A.; KERRI DANIL, Southwest Fisheries Science Center,NMFS, NOAA, 8901 La
Jolla Shores Drive, La Jolla, California 92037, U.S.A.;SHARON R. MELIN, Alaska
Fisheries Science Center, NMFS, NOAA, 7600 SandPoint Way N.E., Building 4,
Seattle, Washington 98115, U.S.A.; BRENT WILKERSON,Department of Biological
Sciences, University of Washington, Seattle, Washington98195, U.S.A.
MARINE MAMMAL SCIENCE, 35(4): 1355–1368 (2019)© 2019 Society for Marine
MammalogyDOI:
10.1111/mms.12605https://onlinelibrary.wiley.com/doi/abs/10.1111/mms.12605
AbstractAge determination from counts of growthlayer groups (GLGs) in tooth
dentine is a common method for aging marinemammals. Using known-aged animals,
we validated this method for acid etchedteeth of California sea lions (CSLs),
Zalophuscalifornianus. Between 1991 and 2013, the upper left canine (n=33) was
collected opportunisticallyduring 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-agein the sample of 1-30 yr old CSLs. Accuracy of age
estimates was found to bedependent on age of the CSLs, however. 71%-79% of age
estimates were within 1 yrof the known-age in CSLs less than 10 yr old. These
findings support the validity ofcounting GLGs to estimate age for CSLs less
than 10 yr old to within one yearof accuracy. For copies of the full PDF,
please email: [email protected] you,Lauren Rust
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