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Abstract:

Fast-swimming dolphins have a relatively stable morphological configuration, explained partially by their vertebral morphology. The hourglass dolphin (Lagenorhynchus cruciger), an oceanic species, is one of the least known species of small odontocetes. The aim of this paper is to describe the osteology of the vertebral column of this species, relating the main morphological characteristics to swimming performance in an oceanic habitat. We also present five new records, with meristics and measurements of the postcranial skeleton in conjunction with an exhaustive characterization of each functional region of the vertebral column through morphometric and graphical interpretations. In this species, the stability of the mid-torso is reinforced by the lumbarization and high number of vertebrae. While the morpho-logical process indicates a mechanical advantage for the swimming muscles, the mid-torso appears to act as an "oscillatory beam" to store potential energy, working as an elastic spring. Tail displacements are mainly produced by the flexion of the peduncle, which undulates from a stable mid-region. As suggested for other fast-swimming dolphins, morphological adaptations in the hourglass dolphin fit a typical pelagic mode of life, with a highly stable column that minimizes energy consumption, increasing efficiency for prolonged swimming.

Registro:

Documento: Artículo
Título:The vertebral column of the hourglass dolphin (Lagenorhynchus cruciger, Quoy and Gaimard, 1824), with notes on its functional properties in relation to its habitat
Autor:Marchesi, M.C.; Pimper, L.E.; Mora, M.S.; Goodall, R.N.P.
Filiación:Museo Acatushún de Aves y Mamíferos Marinos Australes, Sarmiento 44, Ushuaia, Tierra del Fuego, 9410, Argentina
Laboratorio de Genética de la Estructura Poblacional, Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales (FCEN), Universidad de Buenos Aires, Buenos Aires, Argentina
Instituto de Investigaciones Marinas y Costeras (IIMyC) - CONICET, Universidad Nacional de Mar del Plata, CC 1245, Mar del Plata, Buenos Aires, 7600, Argentina
Centro Austral de Investigaciones Científicas (CADIC), B. Houssay 200, Ushuaia, Tierra del Fuego, 9410, Argentina
Palabras clave:Functional morphology; Hourglass dolphin; Lagenorhynchus cruciger; Osteology; Vertebral column; cranium; dolphin; functional morphology; osteology; skeleton; Lagenorhynchus cruciger
Año:2016
Volumen:42
Número:3
Página de inicio:306
Página de fin:316
DOI: http://dx.doi.org/10.1578/AM.42.3.2016.306
Título revista:Aquatic Mammals
Título revista abreviado:Aquatic Mamm.
ISSN:01675427
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01675427_v42_n3_p306_Marchesi

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Citas:

---------- APA ----------
Marchesi, M.C., Pimper, L.E., Mora, M.S. & Goodall, R.N.P. (2016) . The vertebral column of the hourglass dolphin (Lagenorhynchus cruciger, Quoy and Gaimard, 1824), with notes on its functional properties in relation to its habitat. Aquatic Mammals, 42(3), 306-316.
http://dx.doi.org/10.1578/AM.42.3.2016.306
---------- CHICAGO ----------
Marchesi, M.C., Pimper, L.E., Mora, M.S., Goodall, R.N.P. "The vertebral column of the hourglass dolphin (Lagenorhynchus cruciger, Quoy and Gaimard, 1824), with notes on its functional properties in relation to its habitat" . Aquatic Mammals 42, no. 3 (2016) : 306-316.
http://dx.doi.org/10.1578/AM.42.3.2016.306
---------- MLA ----------
Marchesi, M.C., Pimper, L.E., Mora, M.S., Goodall, R.N.P. "The vertebral column of the hourglass dolphin (Lagenorhynchus cruciger, Quoy and Gaimard, 1824), with notes on its functional properties in relation to its habitat" . Aquatic Mammals, vol. 42, no. 3, 2016, pp. 306-316.
http://dx.doi.org/10.1578/AM.42.3.2016.306
---------- VANCOUVER ----------
Marchesi, M.C., Pimper, L.E., Mora, M.S., Goodall, R.N.P. The vertebral column of the hourglass dolphin (Lagenorhynchus cruciger, Quoy and Gaimard, 1824), with notes on its functional properties in relation to its habitat. Aquatic Mamm. 2016;42(3):306-316.
http://dx.doi.org/10.1578/AM.42.3.2016.306