AN ANALYSIS OF A MORPH RATIO CLINE IN THE BANANAQUIT (<i>COEREBA FLAVEOLA</i>) ON GRENADA, WEST INDIES

Wunderle, Joseph M.

doi:10.1111/j.1558-5646.1981.tb04891.x

Cited by 32 publications

(37 citation statements)

References 21 publications

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“…On these islands, melanic morphs are restricted to moist forest at low and high altitudes whereas yellow morph birds occupy disturbed dry lowland habitat (Wunderle 1981a,b). Melanic morphs show a stronger shade preference than yellow morphs (Wunderle 1981a). In the best-studied region in southwestern Grenada, there is a hybrid zone between melanic and yellow morphs that has not moved in 20 years, suggesting the presence of local adaptation, although the adaptive advantage is poorly understood (MacColl & Stevenson 2003).…”

Section: Three Examples Of Avian Melanic Polymorphismmentioning

confidence: 99%

A window on the genetics of evolution:MC1Rand plumage colouration in birds

2005

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Melanins are a ubiquitous component of plumage colouration in birds and serve a wide variety of functions. Although the genetic control of melanism has been studied in chickens and other domestic species, little was known about the molecular genetics of melanin distribution in wild birds until recently. Studies have now revealed that a single locus, the melanocortin-1 receptor (MC1R) locus, is responsible for melanic polymorphisms in at least three unrelated species: the bananaquit, the snow goose and the arctic skua. Results show that melanism was a derived trait and allow other evolutionary inferences about the history of melanism to be made. The role of MC1R in plumage patterning is surprisingly diverse among different species. The conserved molecular basis for the evolution of melanism in birds and several other vertebrates is probably related to low pleiotropic effects at the MC1R.

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Section: Three Examples Of Avian Melanic Polymorphismmentioning

confidence: 99%

A window on the genetics of evolution:MC1Rand plumage colouration in birds

2005

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“…If coloration can itself play a key role in thermoregulation in ectotherms (e.g. Heath 1975;Gibson and Falls 1979;Bittner et al 2002;Pereboom and Biesmeijer 2003) and endotherms (Ellis 1980;Wunderle 1981; but see Beasley and Ankney 1988), morphs may also differ with respect to physiological processes associated with thermoregulation. For example, in snails, morph-dependent thermoregulation is not only due to physical differences in shell reflectivity and absorption of solar energy, and to variations in the activity and habitat selection by the various genotypes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Oxygen consumption in offspring tawny owls Strix aluco is associated with colour morph of foster mother

et al. 2005

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In several colour polymorphic species, morphs differ in thermoregulation either because dark and pale surfaces absorb solar radiation to a different extent and/or because morphs differ in key metabolic processes. Morph-specific thermoregulation may potentially account for the observation that differently coloured individuals are frequently not randomly distributed among habitats, and differ in many respects, including behaviour, morphology, survival and reproductive success. In a wild population of the colour polymorphic tawny owl Strix aluco, a recent crossfostering experiment showed that offspring raised and born from red mothers were heavier than those from grey mothers. In the present study, we tested in the same individuals whether these morph-specific offspring growth patterns were associated with a difference in metabolic rate between offspring of red and grey mothers. For this purpose, we measured nestling oxygen consumption under two different temperatures (laboratory measurements: 4 and 20°C), and examined the relationships between these data sets and the colour morph of foster and biological mothers. After controlling for nestling body mass, oxygen consumption at 20°C was greater in foster offspring raised by grey foster mothers. No relationship was found between nestling oxygen consumption and coloration of their biological mother. Therefore, our study indicates that in our experiment offspring raised by grey foster mothers showed not only a lower body mass than offspring raised by red foster mothers, but also consumed more oxygen under warm temperature. This further indicates that rearing conditions in nests of grey mothers were more stressful than in nests of red mothers.

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“…The clinal trends in the chromosomal morphs, "A," "B," and "C," are presented in Figure 1. The width of a cline, w, in accordance with conventional cline-width criteria, is the distance between points where the phenotypic gradient varies from 0.2 to 0.8 (e.g., May et al, 1975;Endler, 1977;Barrowclough, 1980a;Wunderle, 1981). Relating this to the Uroderma contact zone, we see that the three chromosomal gradients are virtually identical and, upon extrapolation, in each case w = 35 km ( Fig.…”

Section: Reassessmentmentioning

confidence: 89%

GENETIC INTERACTIONS AT A CONTACT ZONE OFURODERMA BILOBATUM(CHIROPTERA: PHYLLOSTOMIDAE)

Hafner

1982

Evolution

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AN ANALYSIS OF A MORPH RATIO CLINE IN THE BANANAQUIT (COEREBA FLAVEOLA) ON GRENADA, WEST INDIES

Cited by 32 publications

References 21 publications

A window on the genetics of evolution:MC1Rand plumage colouration in birds

A window on the genetics of evolution:MC1Rand plumage colouration in birds

Oxygen consumption in offspring tawny owls Strix aluco is associated with colour morph of foster mother

GENETIC INTERACTIONS AT A CONTACT ZONE OFURODERMA BILOBATUM(CHIROPTERA: PHYLLOSTOMIDAE)

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