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Abstract:

Avoiding predation is critical to survival of animals; chemical defenses represent a common strategy among amphibians. In this study, we examined histologically the morphology of skin glands and types of secretions related to chemical skin defense during ontogeny of Rhinella arenarum. Prior to metamorphic climax the epidermis contains typical bufonid giant cells producing a mucous substance supposedly involved in triggering a flight reaction of the tadpole school. An apical layer of alcianophilic mucus covers the epidermis, which could produce the unpleasant taste of bufonid tadpoles. Giant cells disappear by onset of metamorphic climax, when multicellular glands start developing, but the apical mucous layer remains. By the end of climax, neither the granular glands of the dorsum nor the parotoid regions are completely developed. Conversely, by the end of metamorphosis the mucous glands are partially developed and secrete mucus. Adults have at least three types of granular glands, which we designate type A (acidophilic), type B (basophilic) and ventral (mucous). Polymorphic granular glands distribute differently in the body: dorsal granular glands between warts and in the periphery of parotoids contain protein; granular glands of big warts and in the central region of parotoids contain catecholamines, lipids, and glycoconjugates, whereas ventral granular glands produce acidic glycoconjugates. Mucous glands produce both mucus and proteins. Results suggest that in early juveniles the chemical skin defense mechanisms are not functional. Topographical differences in adult skin secretions suggest that granular glands from the big warts in the skin produce similar toxins to the parotoid glands. Anat Rec, 299:141-156, 2016. © 2015 Wiley Periodicals, Inc.

Registro:

Documento: Artículo
Título:Morphological Changes in Skin Glands During Development in Rhinella Arenarum (Anura: Bufonidae)
Autor:Regueira, E.; Dávila, C.; Hermida, G.N.
Filiación:Laboratorio de Biología de Anfibios-Histología Animal, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:Bufonid; Histology; Ontogeny; Parotoid gland; Skin glands; catecholamine; glycoconjugate; lipid; protein; toxin; acidity; acidophile; adult; anatomical variation; animal experiment; Anura; Article; basophil; controlled study; epidermis; giant cell; granular cell; histochemistry; histology; juvenile; metamorphosis; morphology; mucus; mucus gland; nonhuman; ontogeny; organogenesis; parotid gland; priority journal; Rhinella arenarum; skin gland; skin secretion; tadpole; taste; verruca vulgaris; anatomy and histology; animal; Anura; exocrine gland; female; growth, development and aging; immunohistochemistry; male; physiology; predation; skin; Animals; Anura; Epidermis; Exocrine Glands; Female; Immunohistochemistry; Male; Metamorphosis, Biological; Predatory Behavior; Skin
Año:2016
Volumen:299
Número:1
Página de inicio:141
Página de fin:156
DOI: http://dx.doi.org/10.1002/ar.23284
Título revista:Anatomical Record
Título revista abreviado:Anat. Rec.
ISSN:19328486
CAS:lipid, 66455-18-3; protein, 67254-75-5
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_19328486_v299_n1_p141_Regueira

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Citas:

---------- APA ----------
Regueira, E., Dávila, C. & Hermida, G.N. (2016) . Morphological Changes in Skin Glands During Development in Rhinella Arenarum (Anura: Bufonidae). Anatomical Record, 299(1), 141-156.
http://dx.doi.org/10.1002/ar.23284
---------- CHICAGO ----------
Regueira, E., Dávila, C., Hermida, G.N. "Morphological Changes in Skin Glands During Development in Rhinella Arenarum (Anura: Bufonidae)" . Anatomical Record 299, no. 1 (2016) : 141-156.
http://dx.doi.org/10.1002/ar.23284
---------- MLA ----------
Regueira, E., Dávila, C., Hermida, G.N. "Morphological Changes in Skin Glands During Development in Rhinella Arenarum (Anura: Bufonidae)" . Anatomical Record, vol. 299, no. 1, 2016, pp. 141-156.
http://dx.doi.org/10.1002/ar.23284
---------- VANCOUVER ----------
Regueira, E., Dávila, C., Hermida, G.N. Morphological Changes in Skin Glands During Development in Rhinella Arenarum (Anura: Bufonidae). Anat. Rec. 2016;299(1):141-156.
http://dx.doi.org/10.1002/ar.23284