Age and Growth of Loggerhead Sea Turtles (Caretta Caretta) of Coastal Georgia: An Assessment of Skeletochronological Age-Estimates
Loggerhead sea turtles stranded on Cumberland Island (CI), Georgia provide skeletal samples to estimate the ages of individual turtles by skeletochronology. An initial study in 1986 used an average-thickness of humeral cross-section protocol to estimate individual ages and the minimum carapace lengt...
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| Veröffentlicht in: | Bulletin of marine science 1997-09, Vol.61 (2), p.287-304 |
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| description | Loggerhead sea turtles stranded on Cumberland Island (CI), Georgia provide skeletal samples to estimate the ages of individual turtles by skeletochronology. An initial study in 1986 used an average-thickness of humeral cross-section protocol to estimate individual ages and the minimum
carapace length (CL) of nesting females to predict the average age at sexual maturity for the CI sample. The original data and two new CI samples are analyzed by average-thickness, correction-factor, and regression-growth protocols to reassess the original age estimates, to test the reliability
of the three protocols, and to predict growth rates and age of sexual maturity. All protocols show moderate to high variation in one or more steps of the calculations of the age-estimates. The lowest variation occurs in the correction-factor protocol, and this protocol's assumption for the
estimation of the number of resorbed growth layers matches best the observed pattern of bone growth in Caretta. The skeletochronological results show growth patterns (von Bertalanffy model) with asymptotes of 96 - 117 cm curved carapace length (CCL) and growth coefficients of 0.040
- 0.106 for the CI samples. These patterns predict sexual maturity occurring from 20 - 63 yr, assuming 92 cm (SCL) as the mean size at sexual maturity. Growth rate estimates range from 30 - 40 mm yr-1 for 40 - 49 cm SCL turtles to 10 - 35 mm yr-1 for 80 - 89 cm straight
carapace length (SCL) turtles. |
| format | Article |
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carapace length (CL) of nesting females to predict the average age at sexual maturity for the CI sample. The original data and two new CI samples are analyzed by average-thickness, correction-factor, and regression-growth protocols to reassess the original age estimates, to test the reliability
of the three protocols, and to predict growth rates and age of sexual maturity. All protocols show moderate to high variation in one or more steps of the calculations of the age-estimates. The lowest variation occurs in the correction-factor protocol, and this protocol's assumption for the
estimation of the number of resorbed growth layers matches best the observed pattern of bone growth in Caretta. The skeletochronological results show growth patterns (von Bertalanffy model) with asymptotes of 96 - 117 cm curved carapace length (CCL) and growth coefficients of 0.040
- 0.106 for the CI samples. These patterns predict sexual maturity occurring from 20 - 63 yr, assuming 92 cm (SCL) as the mean size at sexual maturity. Growth rate estimates range from 30 - 40 mm yr-1 for 40 - 49 cm SCL turtles to 10 - 35 mm yr-1 for 80 - 89 cm straight
carapace length (SCL) turtles.</description><identifier>ISSN: 0007-4977</identifier><identifier>EISSN: 1553-6955</identifier><identifier>CODEN: BMRSAW</identifier><language>eng</language><publisher>Lawrence, KA: University of Miami - Rosenstiel School of Marine and Atmos</publisher><subject>Amphibia. Reptilia ; Biological and medical sciences ; Caretta caretta ; Fundamental and applied biological sciences. Psychology ; Marine ; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</subject><ispartof>Bulletin of marine science, 1997-09, Vol.61 (2), p.287-304</ispartof><rights>1998 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>288,289,314,780,784</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2176214$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Parham, James F.</creatorcontrib><creatorcontrib>Zug, George R.</creatorcontrib><title>Age and Growth of Loggerhead Sea Turtles (Caretta Caretta) of Coastal Georgia: An Assessment of Skeletochronological Age-Estimates</title><title>Bulletin of marine science</title><addtitle>BMS</addtitle><description>Loggerhead sea turtles stranded on Cumberland Island (CI), Georgia provide skeletal samples to estimate the ages of individual turtles by skeletochronology. An initial study in 1986 used an average-thickness of humeral cross-section protocol to estimate individual ages and the minimum
carapace length (CL) of nesting females to predict the average age at sexual maturity for the CI sample. The original data and two new CI samples are analyzed by average-thickness, correction-factor, and regression-growth protocols to reassess the original age estimates, to test the reliability
of the three protocols, and to predict growth rates and age of sexual maturity. All protocols show moderate to high variation in one or more steps of the calculations of the age-estimates. The lowest variation occurs in the correction-factor protocol, and this protocol's assumption for the
estimation of the number of resorbed growth layers matches best the observed pattern of bone growth in Caretta. The skeletochronological results show growth patterns (von Bertalanffy model) with asymptotes of 96 - 117 cm curved carapace length (CCL) and growth coefficients of 0.040
- 0.106 for the CI samples. These patterns predict sexual maturity occurring from 20 - 63 yr, assuming 92 cm (SCL) as the mean size at sexual maturity. Growth rate estimates range from 30 - 40 mm yr-1 for 40 - 49 cm SCL turtles to 10 - 35 mm yr-1 for 80 - 89 cm straight
carapace length (SCL) turtles.</description><subject>Amphibia. Reptilia</subject><subject>Biological and medical sciences</subject><subject>Caretta caretta</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Marine</subject><subject>Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</subject><issn>0007-4977</issn><issn>1553-6955</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><recordid>eNp1kMFu1DAQhiMEEkvpO_iAEBwijZ3ESbitVmWLtBJCbc_WxDvJpjhx8TigcuyT49DliC9jWZ8-__-8yDayqopct1X1MtsAQJ2XbV2_zt4w3wNI2TZqkz1tBxI4H8U--F_xJHwvDn4YKJwIj-KGUNwuITpi8WGHgWJEcZ4fV3bnkSM6sScfhhE_ie0stszEPNEcV-LmOzmK3p6Cn73zw2gTnj7NrziOE0bit9mrHh3T5XleZHefr2531_nh6_7LbnvIx6KSMa-hJ1tg1yD0ZQ3tsdMEsms6tEqlkkoXiJBK6bLTpbZAnbIIHVgL0HeyuMjeP3sfgv-xEEczjWzJOZzJL2ykLtu2bqoEvjuDyCltH3C2I5uHkPKGR6NkrZUsE_btGRvnIZVFc--XMKcGZrRmmQJPyGbd-7p281PLWRkFSkKjSiOhVOZIPS4umojBDL8N6-Tc_8f5T9gtzqUYRqasqz0dLc8XUAZD_PtU_AGyTZ54</recordid><startdate>19970901</startdate><enddate>19970901</enddate><creator>Parham, James F.</creator><creator>Zug, George R.</creator><general>University of Miami - Rosenstiel School of Marine and Atmos</general><general>Allen</general><scope>IQODW</scope><scope>7SN</scope><scope>7TN</scope><scope>C1K</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>19970901</creationdate><title>Age and Growth of Loggerhead Sea Turtles (Caretta Caretta) of Coastal Georgia: An Assessment of Skeletochronological Age-Estimates</title><author>Parham, James F. ; Zug, George R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-i351t-70fec3ab8a0f4709db6e01b8bac22955263aa098264b646c0eb2ca0b0cc00fb13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Amphibia. Reptilia</topic><topic>Biological and medical sciences</topic><topic>Caretta caretta</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Marine</topic><topic>Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Parham, James F.</creatorcontrib><creatorcontrib>Zug, George R.</creatorcontrib><collection>Pascal-Francis</collection><collection>Ecology Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 1: Biological Sciences & Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Bulletin of marine science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Parham, James F.</au><au>Zug, George R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Age and Growth of Loggerhead Sea Turtles (Caretta Caretta) of Coastal Georgia: An Assessment of Skeletochronological Age-Estimates</atitle><jtitle>Bulletin of marine science</jtitle><stitle>BMS</stitle><date>1997-09-01</date><risdate>1997</risdate><volume>61</volume><issue>2</issue><spage>287</spage><epage>304</epage><pages>287-304</pages><issn>0007-4977</issn><eissn>1553-6955</eissn><coden>BMRSAW</coden><abstract>Loggerhead sea turtles stranded on Cumberland Island (CI), Georgia provide skeletal samples to estimate the ages of individual turtles by skeletochronology. An initial study in 1986 used an average-thickness of humeral cross-section protocol to estimate individual ages and the minimum
carapace length (CL) of nesting females to predict the average age at sexual maturity for the CI sample. The original data and two new CI samples are analyzed by average-thickness, correction-factor, and regression-growth protocols to reassess the original age estimates, to test the reliability
of the three protocols, and to predict growth rates and age of sexual maturity. All protocols show moderate to high variation in one or more steps of the calculations of the age-estimates. The lowest variation occurs in the correction-factor protocol, and this protocol's assumption for the
estimation of the number of resorbed growth layers matches best the observed pattern of bone growth in Caretta. The skeletochronological results show growth patterns (von Bertalanffy model) with asymptotes of 96 - 117 cm curved carapace length (CCL) and growth coefficients of 0.040
- 0.106 for the CI samples. These patterns predict sexual maturity occurring from 20 - 63 yr, assuming 92 cm (SCL) as the mean size at sexual maturity. Growth rate estimates range from 30 - 40 mm yr-1 for 40 - 49 cm SCL turtles to 10 - 35 mm yr-1 for 80 - 89 cm straight
carapace length (SCL) turtles.</abstract><cop>Lawrence, KA</cop><pub>University of Miami - Rosenstiel School of Marine and Atmos</pub><tpages>18</tpages></addata></record> |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; IngentaConnect Free/Open Access Journals; Ingenta Connect |
| subjects | Amphibia. Reptilia Biological and medical sciences Caretta caretta Fundamental and applied biological sciences. Psychology Marine Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution |
| title | Age and Growth of Loggerhead Sea Turtles (Caretta Caretta) of Coastal Georgia: An Assessment of Skeletochronological Age-Estimates |
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