Complementary skeletochronology and stable isotope analyses offer new insight into juvenile loggerhead sea turtle oceanic stage duration and growth dynamics
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Summary
DOI: 10.3354/meps10454
DescriptionStage durations are integral to wildlife population models that can inform management, as they influence age at maturation and stage-specific survival rates. To refine oceanic stage duration estimates for western North Atlantic loggerhead sea turtles Caretta caretta, skeletochronological analysis was conducted on humeri collected in the Azores islands and along the US Atlantic coast. Complementary skeletal growth increment-specific stable isotope analysis was also performed for a sub-set of the humeri, to identify the skeletal growth mark associated with the shift from oceanic to neritic habitat through stable nitrogen isotope (d15N) values and the presence of turtles in inshore waters. Although the transitional growth mark in this sub-sample corresponded to a range of sizes similar to those described in previous studies, mean size at recruitment (55.3 cm straightline carapace length [SCL]) for these turtles was larger than previously estimated. Similarly, while the range of ages at recruitment corresponding both with the transitional growth mark and those yielded by fitting smoothing splines to SCL-at-age data overlapped almost fully with earlier estimates, the mean age estimate (12.4 yr) differed from previous studies. Validated back-calculation of somatic growth rates from skeletal growth marks yielded means and ranges that encompassed those of previous loggerhead growth studies in this geographic area. Generalized additive models and generalized additive mixed models used to assess the potential influence of discrete and continuous covariates on back-calculated growth rates spanning 1984 to 2009 indicated significant effects of age, SCL, calendar year, and d15N, but none for sex or location.
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Document Type
Journal article
Document Format
Acrobat Portable Document Format
Publication Date
2013-10-02
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Download Of article itself as a pdf
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Item Identification
Title: | Complementary skeletochronology and stable isotope analyses offer new insight into juvenile loggerhead sea turtle oceanic stage duration and growth dynamics |
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Status: | Completed |
Publication Date: | 2013-10-02 |
Abstract: |
Stage durations are integral to wildlife population models that can inform management, as they influence age at maturation and stage-specific survival rates. To refine oceanic stage duration estimates for western North Atlantic loggerhead sea turtles Caretta caretta, skeletochronological analysis was conducted on humeri collected in the Azores islands and along the US Atlantic coast. Complementary skeletal growth increment-specific stable isotope analysis was also performed for a sub-set of the humeri, to identify the skeletal growth mark associated with the shift from oceanic to neritic habitat through stable nitrogen isotope (d15N) values and the presence of turtles in inshore waters. Although the transitional growth mark in this sub-sample corresponded to a range of sizes similar to those described in previous studies, mean size at recruitment (55.3 cm straightline carapace length [SCL]) for these turtles was larger than previously estimated. Similarly, while the range of ages at recruitment corresponding both with the transitional growth mark and those yielded by fitting smoothing splines to SCL-at-age data overlapped almost fully with earlier estimates, the mean age estimate (12.4 yr) differed from previous studies. Validated back-calculation of somatic growth rates from skeletal growth marks yielded means and ranges that encompassed those of previous loggerhead growth studies in this geographic area. Generalized additive models and generalized additive mixed models used to assess the potential influence of discrete and continuous covariates on back-calculated growth rates spanning 1984 to 2009 indicated significant effects of age, SCL, calendar year, and d15N, but none for sex or location. |
Other Citation Details: |
Avens L, Goshe LR, Pajuelo M, Bjorndal KA and others (2013) Complementary skeletochronology and stable isotope analyses offer new insight into juvenile loggerhead sea turtle oceanic stage duration and growth dynamics. Mar Ecol Prog Ser 491:235-251. https://doi.org/10.3354/meps10454 |
DOI (Digital Object Identifier): | 10.3354/meps10454 |
Keywords
Theme Keywords
Thesaurus | Keyword |
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UNCONTROLLED | |
None | Age |
None | Caretta caretta · |
None | Life history |
None | Ontogenetic habitat shift |
None | protective species |
None | Skeletal growth marks |
None | turtle |
Document Information
Document Type: | Journal article |
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Format: | Acrobat Portable Document Format |
Status Code: | Published |
Support Roles
Author
Date Effective From: | 2012-05 |
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Date Effective To: | |
Contact (Person): | Avens, Larisa |
Address: |
101 Pivers Island Rd. Beaufort, NC |
Email Address: | larisa.avens@noaa.gov |
Phone: | (252)728-8747 |
Fax: | (252)728-8784 |
Contact Instructions: |
Phone or email |
Distribution Information
Distribution 1
Start Date: | 2013 |
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End Date: | Present |
Download URL: | https://www.int-res.com/articles/meps2013/491/m491p235.pdf |
Distributor: | |
File Name: | m491p235.pdf |
Description: |
Download Of article itself as a pdf |
File Type (Deprecated): | |
Distribution Format: | PDF - Adobe Portable Document Format |
Compression: | Uncompressed |
Review Status: | Chked Viruses Inapp Content |
URLs
URL 1
URL: | https://doi.org/10.3354/meps10454 |
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URL Type: |
Online Resource
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Description: |
Url of Journal extract. |
Catalog Details
Catalog Item ID: | 26033 |
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GUID: | gov.noaa.nmfs.inport:26033 |
Metadata Record Created By: | Lee M Weinberger |
Metadata Record Created: | 2015-07-20 11:25+0000 |
Metadata Record Last Modified By: | SysAdmin InPortAdmin |
Metadata Record Last Modified: | 2023-10-17 16:12+0000 |
Metadata Record Published: | 2021-04-29 |
Owner Org: | SEFSC |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2021-04-29 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2022-04-29 |