Estimating age of spotted and spinner dolphins (Stenella attenuata and Stenella longirostris) from teeth

Myrck, Jr., Albert C. and Hohn, Aleta A. and Sloan, Priscilla A. and Kimura, Makoto and Stanley, Drew D. (1983) Estimating age of spotted and spinner dolphins (Stenella attenuata and Stenella longirostris) from teeth. La Jolla, CA, NOAA/National Marine Fisheries Service/Southwest Fisheries Science Center, (NOAA Technical Memorandum NMFS, SWFC-3)

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Official URL: http://swfsc.noaa.gov/publications/TM/SWFSC/NOAA-T...

Abstract

This paper is an account of preparation and examination techniques and criteria used to estimate age in decalcified and stained tooth thin sections from spinner and spotted dolphins. A dentinal growth layer group (GLG), composed of two thin light and two thicker dark-stained layers, is deposited annually. The GLG component layers are variably visible, but the "ideal" pattern and successive thinning of dentinal GLGs are used as a guide to determine GLG limits. Age-specific thicknesses of dentinal GLGs found in Hawaiian spinner dolphin teeth seem to be applicable to teeth of spotted dolphins and can be used as an aid in locating GLG boundaries. Cementa1 GLGs are composed of a dark-stained and alightly stained layer and usually are deposited at a rate of one per year, but may be deposited every other year or two or three times per year. Two slightly different methods of counting dentinal GLGs are presented, along with guidelines for determining whether dentinal or cementa1 GLG counts provide the best estimate of age for a specimen. (PDF contains 23 pages.)

Item Type: Monograph or Serial Issue
Title: Estimating age of spotted and spinner dolphins (Stenella attenuata and Stenella longirostris) from teeth
Personal Creator/Author:
CreatorsEmail
Myrck, Jr., Albert C.
Hohn, Aleta A.
Sloan, Priscilla A.
Kimura, Makoto
Stanley, Drew D.
Series Name: NOAA Technical Memorandum NMFS
Number: SWFC-3
Date: 1983
Publisher: NOAA/National Marine Fisheries Service/Southwest Fisheries Science Center
Place of Publication: La Jolla, CA
Issuing Agency: United States National Marine Fisheries Service
Uncontrolled Keywords: Spinner dolphins; Spotted dolphins; aging; teeth; Stenella attenuata; Stenella longirostris
Subjects: Ecology
Conservation
Fisheries
Item ID: 2459
Depositing User: Patti M. Marraro
Date Deposited: 21 Jul 2009 14:46
Last Modified: 29 Sep 2011 19:05
URI: http://aquaticcommons.org/id/eprint/2459

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