Artículo
The validity of ecogeographical rules is context-dependent: testing for Bergmann's and Allen's rules by latitude and elevation in a widespread Andean duck
Gutierrez-Pinto, Natalia; Mccracken, Kevin; Alza, Luis; Tubaro, Pablo Luis
; Kopuchian, Cecilia
; Astié, Andrea Alejandra
; Cadena, Daniel
Fecha de publicación:
04/2014
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Biological Journal Of The Linnean Society
ISSN:
0024-4066
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Consistent responses by various organisms to common environmental pressures represent strong evidence of natural selection driving geographical variation. According to Bergmann´s and Allen´s rules, animals from colder habitats are larger and have smaller limbs than those from warmer habitats to minimize heat loss. Although evidence supporting both rules in different organisms exists, most studies have considered only elevational or latitudinal temperature gradients. We tested for the effects of temperature associated with both elevation and latitude on body and appendage size of torrent ducks (Merganetta armata), a widespread species in Andean rivers. We found a negative relationship between body size and temperature across latitude consistent with Bergmann´s rule, whereas there was a positive relationship between these variables along replicate elevational gradients at different latitudes. Limb-size variation did not support Allen´s rule along latitude, nor along elevation. Highelevation ducks were smaller and had longer wings than those inhabiting lower elevations within a river. We hypothesize that temperature is likely a major selective pressure acting on morphology across latitudes, although hypoxia or air density may be more important along elevational gradients. We conclude that the effect of temperature on morphology, and hence the likelihood of documenting ecogeographical rules, depends on the environmental context in which temperature variation is examined.
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IADIZA)
Articulos de INST. ARG DE INVEST. DE LAS ZONAS ARIDAS
Articulos de INST. ARG DE INVEST. DE LAS ZONAS ARIDAS
Articulos(MACNBR)
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Articulos de MUSEO ARG.DE CS.NAT "BERNARDINO RIVADAVIA"
Citación
Gutierrez-Pinto, Natalia; Mccracken, Kevin; Alza, Luis; Tubaro, Pablo Luis; Kopuchian, Cecilia; et al.; The validity of ecogeographical rules is context-dependent: testing for Bergmann's and Allen's rules by latitude and elevation in a widespread Andean duck; Wiley Blackwell Publishing, Inc; Biological Journal Of The Linnean Society; 111; 4-2014; 850-862
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