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Abstract:

Chemical defenses in amphibians are a common antipredatory and antimicrobial strategy related to the presence of dermal glands that synthesize and store toxic or unpalatable substances. Glands are either distributed throughout the skin or aggregated in multiglandular structures, being the parotoids the most ubiquitous macrogland in toads of Bufonidae. Even though dermal glands begin to develop during late-larval stages, many species, including Rhinella arenarum, have immature glands by the end of metamorphosis, and their post-metamorphic growth is unknown. Herein, we compared the post-metamorphic development of parotoids and dorsal glands by histological and allometric studies in a size series of R. arenarum. Histological and histochemical studies to detect proteins, acidic glycoconjugates, and catecholamines, showed that both, parotoids and dorsal glands, acquire characteristics of adults in individuals larger than 50 mm; that is, a moment in which the cryptic coloration disappears. Parotoid height increased allometrically as a function of body size, whereas the size of small dorsal glands decreased with body size. The number of glands in the dorsum was not linearly related to body size, appearing to be an individual characteristic. Only adult specimens had intraepithelial granular glands in the duct of the largest glands of the parotoids. Since toxic secretions accumulate in the central glands of parotoids, allometric growth of parotoids may translate into greater protection from predators in the largest animals. Conversely, large glands in the dorsum, which produce a proteinaceous secretion of unknown function, grow isometrically to body size. Some characteristics, like intraepithelial glands in the ducts and basophilic glands in the dorsum, are limited to adults. © 2017 Wiley Periodicals, Inc.

Registro:

Documento: Artículo
Título:Post-metamorphic development of skin glands in a true toad: Parotoids versus dorsal skin
Autor:Regueira, E.; Dávila, C.; Sassone, A.G.; O'Donohoe, M.E.A.; Hermida, G.N.
Filiación:Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biología Experimental, Laboratorio de Biología de Anfibios-Histología Animal, Universidad de Buenos Aires, Buenos Aires, C1428EGA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, C1033AAJ, Argentina
Palabras clave:Bufonidae; chemical defense; granular glands; Rhinella arenarum; anatomy and histology; animal; Bufonidae; embryology; larva; metamorphosis; skin; Animals; Bufonidae; Larva; Metamorphosis, Biological; Skin
Año:2017
Volumen:278
Número:5
Página de inicio:652
Página de fin:664
DOI: http://dx.doi.org/10.1002/jmor.20661
Título revista:Journal of Morphology
Título revista abreviado:J. Morphol.
ISSN:03622525
CODEN:JOMOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03622525_v278_n5_p652_Regueira

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Citas:

---------- APA ----------
Regueira, E., Dávila, C., Sassone, A.G., O'Donohoe, M.E.A. & Hermida, G.N. (2017) . Post-metamorphic development of skin glands in a true toad: Parotoids versus dorsal skin. Journal of Morphology, 278(5), 652-664.
http://dx.doi.org/10.1002/jmor.20661
---------- CHICAGO ----------
Regueira, E., Dávila, C., Sassone, A.G., O'Donohoe, M.E.A., Hermida, G.N. "Post-metamorphic development of skin glands in a true toad: Parotoids versus dorsal skin" . Journal of Morphology 278, no. 5 (2017) : 652-664.
http://dx.doi.org/10.1002/jmor.20661
---------- MLA ----------
Regueira, E., Dávila, C., Sassone, A.G., O'Donohoe, M.E.A., Hermida, G.N. "Post-metamorphic development of skin glands in a true toad: Parotoids versus dorsal skin" . Journal of Morphology, vol. 278, no. 5, 2017, pp. 652-664.
http://dx.doi.org/10.1002/jmor.20661
---------- VANCOUVER ----------
Regueira, E., Dávila, C., Sassone, A.G., O'Donohoe, M.E.A., Hermida, G.N. Post-metamorphic development of skin glands in a true toad: Parotoids versus dorsal skin. J. Morphol. 2017;278(5):652-664.
http://dx.doi.org/10.1002/jmor.20661