Age estimation on long-beaked common dolphins, delphinus capensis, from the gulf of california Report as inadecuate




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Edna O. Francisco ; Charles Leo Ortiz ;Therya 2014, 5 2

Author: Juan Pablo Gallo-Reynoso

Source: http://www.redalyc.org/articulo.oa?id=402333996005


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Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Sistema de Información Científica Gallo-Reynoso, Juan Pablo; Francisco, Edna O.; Ortiz, Charles Leo Age estimation on long-beaked common dolphins, Delphinus capensis, from the Gulf of California Therya, vol.
5, núm.
2, agosto, 2014, pp.
449-460 Asociación Mexicana de Mastozoología Baja California Sur, México Available in: http:--www.redalyc.org-articulo.oa?id=402333996005 Therya, ISSN (Electronic Version): 2007-3364 therya@cibnor.mx Asociación Mexicana de Mastozoología México How to cite Complete issue More information about this article Journals homepage www.redalyc.org Non-Profit Academic Project, developed under the Open Acces Initiative Estimación de la edad en el delfín común de rostro largo, Delphinus capensis, del Golfo de California THERYA, agosto, 2014 Vol.5(2): 449-460 DOI: 10.12933-therya-14-198 Age estimation on long-beaked common dolphins, Delphinus capensis, from the Gulf of California Juan Pablo Gallo-Reynoso1*, Edna O.
Francisco1,2 y Charles Leo Ortiz3 Introduction: We estimated the age of 41 long-beaked common dolphins, Delphinus capensis, found stranded in Sonora and Baja California beaches in the Gulf of California from 1981 to 2000.
The aim of our work was to know the age and if possible the size of stranded dolphins and the possible causes of their stranding. Methods: Dentinal growth layers in teeth were revealed using an acid-etching technique; it involves preparation of half-etched teeth by grinding and polishing with sandpaper (220-600 grit) and demineralization in 5% formic acid.
A stereo-microscope was used for counting annual growth layer groups (GLGs).
Four different readers of dentinal layers assisted to obtain the estimate of age. Results: Age category estimates were: 17 individuals were adults (12-21 GLGs), 10 individuals were subadults (7-12 GLGs), 10 individuals were juveniles (2-7 GLGs), and 4 individuals were nursing calves ( 1 ...





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