Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth
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 understa...
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| description | 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. |
| doi_str_mv | 10.1371/journal.pone.0190498 |
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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.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0190498</identifier><identifier>PMID: 29338011</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Age ; Age determination ; Animals ; Beluga Whale ; Biology and Life Sciences ; Cetacea ; Chronology ; Delphinapterus leucas ; Dentin ; Dentin - growth & development ; Earth Sciences ; Hypotheses ; Life history ; Marine mammals ; Medicine and Health Sciences ; Methods ; Mineralization ; Neurobiology ; Neurosciences ; Odontology ; Physical Sciences ; Population studies ; Research and Analysis Methods ; Studies ; Teeth ; Tooth - growth & development</subject><ispartof>PloS one, 2018-01, Vol.13 (1), p.e0190498-e0190498</ispartof><rights>2018 Waugh et al. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 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Furthermore, we believe this methodology may have broader applications to age estimation in other taxa.</description><subject>Age</subject><subject>Age determination</subject><subject>Animals</subject><subject>Beluga Whale</subject><subject>Biology and Life Sciences</subject><subject>Cetacea</subject><subject>Chronology</subject><subject>Delphinapterus leucas</subject><subject>Dentin</subject><subject>Dentin - growth & development</subject><subject>Earth Sciences</subject><subject>Hypotheses</subject><subject>Life history</subject><subject>Marine mammals</subject><subject>Medicine and Health Sciences</subject><subject>Methods</subject><subject>Mineralization</subject><subject>Neurobiology</subject><subject>Neurosciences</subject><subject>Odontology</subject><subject>Physical Sciences</subject><subject>Population studies</subject><subject>Research and Analysis Methods</subject><subject>Studies</subject><subject>Teeth</subject><subject>Tooth - growth & development</subject><issn>1932-6203</issn><issn>1932-6203</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><sourceid>DOA</sourceid><recordid>eNptUttu1DAQjRCIlsIfILDEy1ZiFzt2YvsFCRVYKq0ED8CrNXEmu668cWo7oP4OX0r20qpFPPky5zIzOkXxktEF45K9uwpj7MEvhtDjgjJNhVaPilOmeTmvS8of37ufFM9SuqK04qqunxYnpeZcUcZOiz8_wbsWsgs9CR1ZxvA7b8gKbjDuHuNAZsvV8py0OITkdjDwJEJGMibXr0kLzt8Q19uIW-zzVFwfJLzrMU0Fkjc4sfvs9gYN-nENZPYR_bBxPQwZ45iIx9FCIrNv4D2kt4RJWZ-fk4yYN8-LJx34hC-O51nx4_On7xdf5quvy8uLD6u5rco6z-uKSaBUMl5ZpjtpodbQlQo7KZFb3ahGlY1AZLZhQiGtsAVhqbYooGkEPyteH3QHH5I5rjcZppVijNU1nxCXB0Qb4MoM0W0h3pgAzuw_QlwbiNlZj6a0DZW8axtlSyGUnToTqFGJlrectTu390e3sdlia6cNRfAPRB9Wercx6_DLVFJSyupJYHYUiOF6xJTN1iWL0_56DOO-b11JoUs2Qd_8A_3_dOKAsjGkFLG7a4ZRs4vcLcvsImeOkZtor-4Pcke6zRj_C1xi1nU</recordid><startdate>20180101</startdate><enddate>20180101</enddate><creator>Waugh, David A</creator><creator>Suydam, Robert S</creator><creator>Ortiz, Joseph D</creator><creator>Thewissen, J G M</creator><general>Public Library of Science</general><general>Public Library of Science (PLoS)</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QG</scope><scope>7QL</scope><scope>7QO</scope><scope>7RV</scope><scope>7SN</scope><scope>7SS</scope><scope>7T5</scope><scope>7TG</scope><scope>7TM</scope><scope>7U9</scope><scope>7X2</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8C1</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>H94</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>KB.</scope><scope>KB0</scope><scope>KL.</scope><scope>L6V</scope><scope>LK8</scope><scope>M0K</scope><scope>M0S</scope><scope>M1P</scope><scope>M7N</scope><scope>M7P</scope><scope>M7S</scope><scope>NAPCQ</scope><scope>P5Z</scope><scope>P62</scope><scope>P64</scope><scope>PATMY</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>PYCSY</scope><scope>RC3</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope><orcidid>https://orcid.org/0000-0002-6725-1272</orcidid></search><sort><creationdate>20180101</creationdate><title>Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth</title><author>Waugh, David A ; Suydam, Robert S ; Ortiz, Joseph D ; Thewissen, J G M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c526t-6517a007135c19f7ca69af28ef77e3c9b8b82b4ee1cb148e05eda4c09ce4abb43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Age</topic><topic>Age determination</topic><topic>Animals</topic><topic>Beluga Whale</topic><topic>Biology and Life Sciences</topic><topic>Cetacea</topic><topic>Chronology</topic><topic>Delphinapterus leucas</topic><topic>Dentin</topic><topic>Dentin - 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Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>PloS one</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Waugh, David A</au><au>Suydam, Robert S</au><au>Ortiz, Joseph D</au><au>Thewissen, J G M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2018-01-01</date><risdate>2018</risdate><volume>13</volume><issue>1</issue><spage>e0190498</spage><epage>e0190498</epage><pages>e0190498-e0190498</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><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. 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| subjects | Age Age determination Animals Beluga Whale Biology and Life Sciences Cetacea Chronology Delphinapterus leucas Dentin Dentin - growth & development Earth Sciences Hypotheses Life history Marine mammals Medicine and Health Sciences Methods Mineralization Neurobiology Neurosciences Odontology Physical Sciences Population studies Research and Analysis Methods Studies Teeth Tooth - growth & development |
| title | Validation of Growth Layer Group (GLG) depositional rate using daily incremental growth lines in the dentin of beluga (Delphinapterus leucas (Pallas, 1776)) teeth |
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