scholarly journals Unmelanized Plumage Patterns in Old World Leaf Warblers Do Not Correspond to Sequence Variation at the Melanocortin-1 Receptor Locus (MC1R)

2003 ◽  
Vol 20 (10) ◽  
pp. 1675-1681 ◽  
Author(s):  
E. A. MacDougall-Shackleton
Keyword(s):  
Sequence Variation ◽  
Melanocortin 1 Receptor ◽  
Old World ◽  
Receptor Locus ◽  
Leaf Warblers

scholarly journals Early diversification of sperm size in the evolutionary history of the old world leaf warblers (Phylloscopidae)

2016 ◽  
Vol 29 (4) ◽  
pp. 777-789 ◽  
Author(s):  
K. Supriya ◽  
M. Rowe ◽  
T. Laskemoen ◽  
D. Mohan ◽  
T. D. Price ◽  
...  
Keyword(s):  
Evolutionary History ◽  
Old World ◽  
Early Diversification ◽  
History Of ◽  
Leaf Warblers ◽  
Sperm Size

scholarly journals Sequence Variation of Melanocortin 1 Receptor (MC1R) Gene and Association with Plumage Color in Domestic Geese

2014 ◽  
Vol 51 (3) ◽  
pp. 270-274 ◽  
Author(s):  
Jing Huang ◽  
Bing Zhou ◽  
Da-Qian He ◽  
Shi-Yi Chen ◽  
Qing Zhu ◽  
...  
Keyword(s):  
Sequence Variation ◽  
Plumage Color ◽  
Melanocortin 1 Receptor ◽  
Mc1r Gene

Evolution of ecological differences in the Old World leaf warblers

Nature ◽  
1992 ◽  
Vol 355 (6363) ◽  
pp. 817-821 ◽  
Author(s):  
Adam D. Rich man ◽  
Trevor Price
Keyword(s):  
Old World ◽  
Leaf Warblers ◽  
Ecological Differences

scholarly journals EVOLUTION OF BREEDING DISTRIBUTIONS IN THE OLD WORLD LEAF WARBLERS (GENUS PHYLLOSCOPUS )

Evolution ◽  
1997 ◽  
Vol 51 (2) ◽  
pp. 552-561 ◽  
Author(s):  
Trevor D. Price ◽  
Andreas J. Helbig ◽  
Adam D. Richman
Keyword(s):  
Old World ◽  
Leaf Warblers

Evolution of Breeding Distributions in the Old World Leaf Warblers (Genus Phylloscopus)

Evolution ◽  
1997 ◽  
Vol 51 (2) ◽  
pp. 552 ◽  
Author(s):  
Trevor D. Price ◽  
Andreas J. Helbig ◽  
Adam D. Richman
Keyword(s):  
Old World ◽  
Leaf Warblers

scholarly journals Human DNA Sequence Variation in a 6.6-kb Region Containing the Melanocortin 1 Receptor Promoter

Genetics ◽  
2001 ◽  
Vol 158 (3) ◽  
pp. 1253-1268 ◽  
Author(s):  
Kateryna D Makova ◽  
Michele Ramsay ◽  
Trefor Jenkins ◽  
Wen-Hsiung Li
Keyword(s):  
Sequence Variation ◽  
Population Expansion ◽  
Purifying Selection ◽  
Phylogenetic Footprinting ◽  
Recent Common Ancestor ◽  
Coding Region ◽  
Melanocortin 1 Receptor ◽  
Mc1r Gene ◽  
Most Recent Common Ancestor ◽  
Dna Sequence Variation

AbstractAn ∼6.6-kb region located upstream from the melanocortin 1 receptor (MC1R) gene and containing its promoter was sequenced in 54 humans (18 Africans, 18 Asians, and 18 Europeans) and in one chimpanzee, gorilla, and orangutan. Seventy-six polymorphic sites were found among the human sequences and the average nucleotide diversity (π) was 0.141%, one of the highest among all studies of nuclear sequence variation in humans. Opposite to the pattern observed in the MC1R coding region, in the present region π is highest in Africans (0.136%) compared to Asians (0.116%) and Europeans (0.122%). The distributions of π, θ, and Fu and Li's F-statistic are nonuniform along the sequence and among continents. The pattern of genetic variation is consistent with a population expansion in Africans. We also suggest a possible phase of population size reduction in non-Africans and purifying selection acting in the middle subregion and parts of the 5′ subregion in Africans. We hypothesize diversifying selection acting on some sites in the 5′ and 3′ subregions or in the MC1R coding region in Asians and Europeans, though we cannot reject the possibility of relaxation of functional constraints in the MC1R gene in Asians and Europeans. The mutation rate in the sequenced region is 1.65 × 10—9 per site per year. The age of the most recent common ancestor for this region is similar to that for the other long noncoding regions studied to date, providing evidence for ancient gene genealogies. Our population screening and phylogenetic footprinting suggest potentially important sites for the MC1R promoter function.

scholarly journals The roles of time and ecology in the continental radiation of the Old World leaf warblers ( Phylloscopus and Seicercus )

2010 ◽  
Vol 365 (1547) ◽  
pp. 1749-1762 ◽  
Author(s):  
Trevor D. Price
Keyword(s):  
Reproductive Isolation ◽  
Ecological Factors ◽  
Critical Factor ◽  
Sympatric Species ◽  
Sister Species ◽  
Ecological Change ◽  
Old World ◽  
Stage Process ◽  
Leaf Warblers ◽  
Habitat Tracking

Many continental sister species are allopatric or parapatric, ecologically similar and long separated, of the order of millions of years. Sympatric, ecologically differentiated, species, are often even older. This raises the question of whether build-up of sympatric diversity generally follows a slow process of divergence in allopatry, initially without much ecological change. I review patterns of speciation among birds belonging to the continental Eurasian Old World leaf warblers ( Phylloscopus and Seicercus ). I consider speciation to be a three-stage process (range expansions, barriers to gene flow, reproductive isolation) and ask how ecological factors at each stage have contributed to speciation, both among allopatric/parapatric sister species and among those lineages that eventually led to currently sympatric species. I suggest that time is probably the critical factor that leads to reproductive isolation between sympatric species and that a strong connection between ecological divergence and reproductive isolation remains to be established. Besides reproductive isolation, ecological factors can affect range expansions (e.g. habitat tracking) and the formation of barriers (e.g. treeless areas are effective barriers for warblers). Ecological factors may often limit speciation on continents because range expansions are difficult in ‘ecologically full’ environments.

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