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A reappraisal of the aquatic specializations of the Galapagos marine iguana (Amblyrhynchus cristatus).

Por:

Dawson, William R, 1927-

Colaborador(es):

Tipo de material:

ArtículoIdioma: Inglés Descripción: : 891-897Tema(s):

Clasificación CDD:

597.95 22

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En: Evolution Vol. 31, (December 1977), p. 891-897Resumen: Contrary to earlier descriptions, the Galapagos marine iguana is not a particularly fast swimmer, the mean velocity for burst swimming by large adults being only 0.85 m/s. Moreover, this lizard depends on physiological patterns characteristic of terrestrial iguanids in its amphibious existence. Aerobic metabolic scope is relatively restricted and highly dependent upon body temperature. This function reaches a maximum at 35 C, a value characteristic of basking marine iguanas, but substantially higher than the water temperatures at which the most strenuous activities of this species occur. Its abilities to forage in cool waters appear to depend upon substantial anaerobic capacities, which resemble those of terrestrial iguanids. As in these other lizards, anaerobic metabolic scope appears relatively independent of temperature in the marine iguana. Physiological results and a review of the probable events leading to the evolution of the Galapagos marine iguana support a view of this animal as a representative of a terrestrial line that was preadapted for exploiting a unique combination of circumstances.

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Existencias ( 2 )
Notas de título ( 3 )

Existencias
Imagen de cubierta	Tipo de ítem	Biblioteca actual	Biblioteca de origen	Colección	Ubicación en estantería	Signatura topográfica	Materiales especificados	Info Vol	URL	Copia número	Estado	Notas	Fecha de vencimiento	Código de barras	Reserva de ítems	Prioridad de la cola de reserva de ejemplar	Reservas para cursos
	Documento electrónico	Corley Smith Library Colección PDF		Galápagos		597.95 DAW 1977 (Navegar estantería(Abre debajo))					Disponible			2021-1838
	Artículo	Corley Smith Library Artículos		Galápagos		597.95 DAW (Navegar estantería(Abre debajo))					Disponible			G1374

Contrary to earlier descriptions, the Galapagos marine iguana is not a particularly fast swimmer, the mean velocity for burst swimming by large adults being only 0.85 m/s.
Moreover, this lizard depends on physiological patterns characteristic of terrestrial iguanids in its amphibious existence. Aerobic metabolic scope is relatively restricted and highly dependent upon body temperature. This function reaches a maximum at 35 C, a value characteristic of basking marine iguanas, but substantially higher than the water temperatures at which the most strenuous activities of this species occur. Its abilities to forage in cool waters appear to depend upon substantial anaerobic capacities, which resemble those of terrestrial iguanids. As in these other lizards, anaerobic metabolic scope appears relatively independent of temperature in the marine iguana. Physiological results and a review of the probable events leading to the evolution of the Galapagos marine iguana support a view of this animal as a representative of a terrestrial line that was preadapted for exploiting a unique combination of circumstances.

English

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