| 61. |
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| 62. |
- Sheldon, BC, et al.
(author)
-
Gender and environmental sensitivity in nestling collared flycatchers
- 1998
-
In: ECOLOGY. - : ECOLOGICAL SOC AMER. - 0012-9658. ; 79:6, s. 1939-1948
-
Journal article (other academic/artistic)abstract
- In many vertebrates, males are apparently more affected by adverse environmental conditions, particularly during early stages of development, than are females. Three explanations have been proposed for this pattern. First, sexual size dimorphism (SSD) may
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| 63. |
- Sheldon, BC, et al.
(author)
-
Offspring sex and paternity in the collared flycatcher
- 1996
-
In: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES. - : ROYAL SOC LONDON. - 0962-8452. ; 263:1373, s. 1017-1021
-
Journal article (other academic/artistic)abstract
- Sex allocation theory, when combined with 'genetic benefit' models of female choice, predicts that it would be adaptive for female birds to bias the sex ratio of extra-pair offspring in favour of males. We tested this prediction for a population of collar
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| 64. |
- Sheldon, BC, et al.
(author)
-
Paternal effort related to experimentally manipulated paternity of male collared flycatchers
- 1998
-
In: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES. - : ROYAL SOC LONDON. - 0962-8452. ; 265:1407, s. 1737-1742
-
Journal article (other academic/artistic)abstract
- The way that variation in paternity affects the optimal level of paternal effort has been a contentious issue, both in terms of theory and the empirical data needed to test competing theories. Clarification of the theoretical issues has led to the predict
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| 65. |
- Sheldon, BC, et al.
(author)
-
Paternal genetic contribution to offspring condition predicted by size of male secondary sexual character
- 1997
-
In: PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES. - : ROYAL SOC LONDON. - 0962-8452. ; 264:1380, s. 297-302
-
Journal article (other academic/artistic)abstract
- Whether females can obtain genetic benefits from mate choice is contentious, and the main problem faced by previous studies of natural populations is that many factors other than paternal genes contribute to offspring fitness. Here, we use comparisons bet
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| 66. |
- Sheldon, BC, et al.
(author)
-
Sexual selection resulting from extrapair paternity in collared flycatchers
- 1999
-
In: ANIMAL BEHAVIOUR. - : ACADEMIC PRESS LTD. - 0003-3472. ; 57, s. 285-298
-
Journal article (other academic/artistic)abstract
- Extrapair paternity has been suggested to represent a potentially important source of sexual selection on male secondary sexual characters, particularly in birds with predominantly socially monogamous mating systems. However, relatively few studies have d
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| 67. |
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| 68. |
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| 69. |
- Sundqvist, A-K, et al.
(author)
-
Unequal contribution of sexes in the origin of dog breeds.
- 2006
-
In: Genetics. - 0016-6731. ; 172:2, s. 1121-8
-
Journal article (peer-reviewed)abstract
- Department of Evolutionary Biology, Uppsala University, Sweden. anna-karin.sundqvist@ebc.uu.seDogs (Canis familiaris) were domesticated from the gray wolf (Canis lupus) at least 14,000 years ago, and there is evidence of dogs with phenotypes similar to those in modern breeds 4000 years ago. However, recent genetic analyses have suggested that modern dog breeds have a much more recent origin, probably <200 years ago. To study the origin of contemporaneous breeds we combined the analysis of paternally inherited Y chromosome markers with maternally inherited mitochondrial DNA and biparentally inherited autosomal microsatellite markers in both domestic dogs and their wild ancestor, the gray wolf. Our results show a sex bias in the origin of breeds, with fewer males than females contributing genetically, which clearly differs from the breeding patterns in wild gray wolf populations where both sexes have similar contributions. Furthermore, a comparison of mitochondrial DNA and Y chromosome diversity in dog groups recognized by the World Canine Organization, as well as in groups defined by the breeds' genetic composition, shows that paternal lineages are more differentiated among groups than maternal lineages. This demonstrates a lower exchange of males than of females between breeds belonging to different groups, which illustrates how breed founders may have been chosen.
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| 70. |
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