| 1. |
- von Schantz, Torbjörn, et al.
(författare)
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Genetics of long-spurred pheasants - Reply
- 1990
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 343:6259, s. 600-600
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Tidskriftsartikel (refereegranskat)abstract
- Abstract is not available
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| 2. |
- Wittzell, Håkan
(författare)
-
Directional selection on morphology In the pheasant, Phasianus colchicus
- 1991
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Ingår i: Oikos. - 1600-0706. ; 61:3, s. 394-400
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Tidskriftsartikel (refereegranskat)abstract
- Directional selection was relatively frequent, and in some instances intense, during a three-year study of a pheasant population. The pheasant is a polygynous species. In addition to weight, tarsus length and wing length, which were studied in both sexes, three beak characters were measured in females, and tail and spur length in males. Both univariate and multivariate techniques were used to estimate selection. Selection associated with survival and reproductive success was detected in both sexes. Selection gradients indicated consistent opposing selection for low weight and long tarsus in association with female survival, while female reproductive success was negatively related to bill length. In males, several phenotypically correlated characters covaried positively with reproductive success, which was measured both as the number of acquired females and the estimated number of sired chicks. However, only the selection gradients for spur length were significant, indicating that spur length is the most important factor for male reproductive success. Male survival was also associated with spur length. This suggests that spur length at the phenotypic level is enhanced by both natural and sexual selection.
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| 3. |
- Wittzell, Håkan, et al.
(författare)
-
Molecular characterization of 3 MHC class II B haplotypes in the ring-necked pheasant
- 1994
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Ingår i: Immunogenetics. - 1432-1211. ; 39:6, s. 395-403
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Tidskriftsartikel (refereegranskat)abstract
- We investigated the class II B genes in a free-ranging population of the ring-necked pheasant Phasianus colchicus by a combination of restriction fragment length polymorphism (RFLP), polymerase chain reaction (PCR), and DNA sequencing. Special attention was paid to the variation in the second exon, which encodes the peptide-binding beta(i)-domain. The population was introduced, but it still exhibited major histocompatibility complex polymorphism with at least three segregating class II B haplotypes and consequently six genotypes. We found two class LI B genes associated with each haplotype. The class II B genes of birds had until then only been molecularly characterized in the domestic chicken. The pheasant genes were highly variable, although one of the amplified sequences was found in two different haplotypes. Taken together, the most polymorphic positions (residues 37 and 38) were not identical in any of the predicted protein sequences, but all except one of the motifs had already been found in the domestic chicken. Structurally important features in mammalian class II B genes were generally conserved also in the pheasant sequences, but the loss of a potential salt bridge constituent (Arg(72)) in several sequences may suggest a slightly different structure of the adjacent parts of the peptide-binding groove. The pheasant genes are most closely related to the so called B-LBII family in the chicken, indicating that this represents a major line of development among avian class II B genes.
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