Validation of Growth Layer Group (GLG) Depositional Rate Using Daily Incremental Growth Lines in the Dentin of Beluga (Delphinapterus Leucas (Pallas, 1776)) Teeth

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2018 Jan 17

PMID 29338011

Citations 11

Authors

David A Waugh

Robert S Suydam

Joseph D Ortiz

J G M Thewissen

Affiliations

Soon will be listed here.

Abstract

Counts of Growth Layer Groups (GLGs) in the dentin of marine mammal teeth are widely used as indicators of age. In most marine mammals, observations document that GLGs are deposited yearly, but in beluga whales, some studies have supported the view that two GLGs are deposited each year. Our understanding of beluga life-history differs substantially depending on assumptions regarding the timing of GLG deposition; therefore, resolving this issue has important considerations for population assessments. In this study, we used incremental lines that represent daily pulses of dentin mineralization to test the hypothesis that GLGs in beluga dentin are deposited on a yearly basis. Our estimate of the number of daily growth lines within one GLG is remarkably close to 365 days within error, supporting the hypothesis that GLGs are deposited annually in beluga. We show that measurement of daily growth increments can be used to validate the time represented by GLGs in beluga. Furthermore, we believe this methodology may have broader applications to age estimation in other taxa.

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