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Title: Complementary skeletochronology and stable isotope analyses offer new insight into juvenile loggerhead sea turtle oceanic stage duration and growth dynamics
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

Supplemental Information:

doi:10.3354/meps10454

Keywords

Theme Keywords

Thesaurus Keyword
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
Format: Acrobat Portable Document Format
Status Code: Published

Support Roles

Author

CC ID: 209164
Date Effective From: 2012-05
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

URLs

URL 1

CC ID: 209163
URL: http://www.int-res.com/abstracts/meps/v491/p235-251/
URL Type:
Online Resource
Description:

Url of Journal extract.

Catalog Details

Catalog Item ID: 26033
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: Lee M Weinberger
Metadata Record Last Modified: 2021-04-29 15:14+0000
Metadata Record Published: 2021-04-29
Owner Org: SEFSC
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2022-04-30