Age and Reproductive Maturity of New Zealand Fur Seals (Arctocephalus forsteri) in Southern Australia
New Zealand fur seals (Arctocephalus forsteri) are common in the Australian-New Zealand region, but vital demographic data are lacking. Accurate determination of the age of individuals is critical to the study of age-specific life-history parameters. A cross-sectional sample of female and male New Z...
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| Veröffentlicht in: | Journal of mammalogy 2007-06, Vol.88 (3), p.639-648 |
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| creator | McKenzie, Jane Page, Brad Shaughnessy, Peter D. Hindell, Mark A. |
| description | New Zealand fur seals (Arctocephalus forsteri) are common in the Australian-New Zealand region, but vital demographic data are lacking. Accurate determination of the age of individuals is critical to the study of age-specific life-history parameters. A cross-sectional sample of female and male New Zealand fur seals was caught and animals were individually marked on Kangaroo Island, South Australia, between 2000 and 2003. Seals were aged through examination of a postcanine tooth, which was removed from each animal. Annual formation of cementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed from individuals of known age. Indirect methods of assessing reproductive maturity based on characteristics of mammary teats indicated that females 1st gave birth between 4 and 8 years of age, with an average age at reproductive maturity (ARM) of 5 years. No females were observed to breed beyond 22 years. Age of 1st territory tenure in males ranged from 8 to 10 years. Variation in ARM between individuals appears to be related in part to body size and condition. Classification of mammary teat status in combination with techniques for aging live animals provided a means of assessing ARM in the absence of extensive longitudinal data. |
| doi_str_mv | 10.1644/06-MAMM-A-150R1.1 |
| format | Article |
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Accurate determination of the age of individuals is critical to the study of age-specific life-history parameters. A cross-sectional sample of female and male New Zealand fur seals was caught and animals were individually marked on Kangaroo Island, South Australia, between 2000 and 2003. Seals were aged through examination of a postcanine tooth, which was removed from each animal. Annual formation of cementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed from individuals of known age. Indirect methods of assessing reproductive maturity based on characteristics of mammary teats indicated that females 1st gave birth between 4 and 8 years of age, with an average age at reproductive maturity (ARM) of 5 years. No females were observed to breed beyond 22 years. Age of 1st territory tenure in males ranged from 8 to 10 years. Variation in ARM between individuals appears to be related in part to body size and condition. Classification of mammary teat status in combination with techniques for aging live animals provided a means of assessing ARM in the absence of extensive longitudinal data.</description><identifier>ISSN: 0022-2372</identifier><identifier>EISSN: 1545-1542</identifier><identifier>DOI: 10.1644/06-MAMM-A-150R1.1</identifier><identifier>CODEN: JOMAAL</identifier><language>eng</language><publisher>Provo, UT: American Society of Mammalogists</publisher><subject>Age ; age estimation ; Animal ethology ; Aquatic mammals ; Arctocephalus forsteri ; Biological and medical sciences ; Body size ; Breeding seasons ; cementum ; FEATURE ARTICLES ; Female animals ; Females ; Fundamental and applied biological sciences. Psychology ; Immatures ; Labor intensive ; Life history ; longevity ; Male animals ; Males ; Mammalia ; Marine ; Maturity ; National parks ; Pregnancy ; Psychology. Psychoanalysis. Psychiatry ; Pups ; Reproduction ; Seals ; Sexual maturity ; Studies ; Teats ; Vertebrata ; Wildlife conservation</subject><ispartof>Journal of mammalogy, 2007-06, Vol.88 (3), p.639-648</ispartof><rights>American Society of Mammalogists</rights><rights>Copyright 2007 American Society of Mammalogists</rights><rights>2007 INIST-CNRS</rights><rights>Copyright Alliance Communications Group, A Division of Allen Press, Inc. 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Accurate determination of the age of individuals is critical to the study of age-specific life-history parameters. A cross-sectional sample of female and male New Zealand fur seals was caught and animals were individually marked on Kangaroo Island, South Australia, between 2000 and 2003. Seals were aged through examination of a postcanine tooth, which was removed from each animal. Annual formation of cementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed from individuals of known age. Indirect methods of assessing reproductive maturity based on characteristics of mammary teats indicated that females 1st gave birth between 4 and 8 years of age, with an average age at reproductive maturity (ARM) of 5 years. No females were observed to breed beyond 22 years. Age of 1st territory tenure in males ranged from 8 to 10 years. Variation in ARM between individuals appears to be related in part to body size and condition. Classification of mammary teat status in combination with techniques for aging live animals provided a means of assessing ARM in the absence of extensive longitudinal data.</description><subject>Age</subject><subject>age estimation</subject><subject>Animal ethology</subject><subject>Aquatic mammals</subject><subject>Arctocephalus forsteri</subject><subject>Biological and medical sciences</subject><subject>Body size</subject><subject>Breeding seasons</subject><subject>cementum</subject><subject>FEATURE ARTICLES</subject><subject>Female animals</subject><subject>Females</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Immatures</subject><subject>Labor intensive</subject><subject>Life history</subject><subject>longevity</subject><subject>Male animals</subject><subject>Males</subject><subject>Mammalia</subject><subject>Marine</subject><subject>Maturity</subject><subject>National parks</subject><subject>Pregnancy</subject><subject>Psychology. 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Psychiatry</subject><subject>Pups</subject><subject>Reproduction</subject><subject>Seals</subject><subject>Sexual maturity</subject><subject>Studies</subject><subject>Teats</subject><subject>Vertebrata</subject><subject>Wildlife conservation</subject><issn>0022-2372</issn><issn>1545-1542</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqNkEtrFEEUhQtRcIz-AMFFISi66OTWa7p72QSTCBmFRDduiuqq26aGTtekHkr-vTVOUHDlqm5xvnMfh5CXDI7ZWsoTWDebYbNphoYpuGLH7BFZMSVV_Ur-mKwAOG-4aPlT8iylLQColsOK4PAdqVkcvcJdDK7Y7H8g3Zhcos_3NEz0E_6k39DMe-isRHpd60TfDdHmYHF3Y-aS6BRiyhj9e-oXeh1KvsG40KGkHM3szXPyZKoufPHwHpGvZx--nF40l5_PP54Ol82oQOSGO6UsjP3EEVvOTGuVEa0D2Y9gnZscw5Y54TgfO8vN6JRwo8CJjV3fCjaJI_L20LfeclcwZX3rk8W5Lo-hJM1BKcnkuoKv_wG3ocSl7qY5rwCwvq8QO0A2hpQiTnoX_a2J95qB3qeuYa33qetB_05ds-p589DYJGvmKZrF-vTX2HVSCKEq9-rAbVMO8Y8uZd-1IKt8cpBHH8KC_zH4F4dVm0U</recordid><startdate>20070601</startdate><enddate>20070601</enddate><creator>McKenzie, Jane</creator><creator>Page, Brad</creator><creator>Shaughnessy, Peter D.</creator><creator>Hindell, Mark A.</creator><general>American Society of Mammalogists</general><general>Brigham Young University, Department of Zoology</general><general>Oxford University Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7QG</scope><scope>7SN</scope><scope>7X7</scope><scope>7XB</scope><scope>88A</scope><scope>88E</scope><scope>88I</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M2O</scope><scope>M2P</scope><scope>M7P</scope><scope>MBDVC</scope><scope>P64</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>R05</scope><scope>RC3</scope><scope>S0X</scope><scope>7TN</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>20070601</creationdate><title>Age and Reproductive Maturity of New Zealand Fur Seals (Arctocephalus forsteri) in Southern Australia</title><author>McKenzie, Jane ; Page, Brad ; Shaughnessy, Peter D. ; Hindell, Mark A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-b503t-2d55c0b9f2ee721a7c5a37d049b0cddfd1e71d3d22b8c2abd53db3ef1b89731f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Age</topic><topic>age estimation</topic><topic>Animal ethology</topic><topic>Aquatic mammals</topic><topic>Arctocephalus forsteri</topic><topic>Biological and medical sciences</topic><topic>Body size</topic><topic>Breeding seasons</topic><topic>cementum</topic><topic>FEATURE ARTICLES</topic><topic>Female animals</topic><topic>Females</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Immatures</topic><topic>Labor intensive</topic><topic>Life history</topic><topic>longevity</topic><topic>Male animals</topic><topic>Males</topic><topic>Mammalia</topic><topic>Marine</topic><topic>Maturity</topic><topic>National parks</topic><topic>Pregnancy</topic><topic>Psychology. Psychoanalysis. 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Accurate determination of the age of individuals is critical to the study of age-specific life-history parameters. A cross-sectional sample of female and male New Zealand fur seals was caught and animals were individually marked on Kangaroo Island, South Australia, between 2000 and 2003. Seals were aged through examination of a postcanine tooth, which was removed from each animal. Annual formation of cementum layers was confirmed and accuracy in age estimation was determined by examination of teeth removed from individuals of known age. Indirect methods of assessing reproductive maturity based on characteristics of mammary teats indicated that females 1st gave birth between 4 and 8 years of age, with an average age at reproductive maturity (ARM) of 5 years. No females were observed to breed beyond 22 years. Age of 1st territory tenure in males ranged from 8 to 10 years. Variation in ARM between individuals appears to be related in part to body size and condition. Classification of mammary teat status in combination with techniques for aging live animals provided a means of assessing ARM in the absence of extensive longitudinal data.</abstract><cop>Provo, UT</cop><pub>American Society of Mammalogists</pub><doi>10.1644/06-MAMM-A-150R1.1</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of mammalogy, 2007-06, Vol.88 (3), p.639-648 |
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| source | BioOne Complete; Jstor Complete Legacy; Oxford University Press Journals All Titles (1996-Current) |
| subjects | Age age estimation Animal ethology Aquatic mammals Arctocephalus forsteri Biological and medical sciences Body size Breeding seasons cementum FEATURE ARTICLES Female animals Females Fundamental and applied biological sciences. Psychology Immatures Labor intensive Life history longevity Male animals Males Mammalia Marine Maturity National parks Pregnancy Psychology. Psychoanalysis. Psychiatry Pups Reproduction Seals Sexual maturity Studies Teats Vertebrata Wildlife conservation |
| title | Age and Reproductive Maturity of New Zealand Fur Seals (Arctocephalus forsteri) in Southern Australia |
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