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Träfflista för sökning "L773:0003 3472 OR L773:1095 8282 "

Sökning: L773:0003 3472 OR L773:1095 8282

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1.
  • Alatalo, Rauno V, et al. (författare)
  • Can Female Preference Explain Sexual Dichromatism In The Pied Flycatcher, Ficedula-Hypoleuca
  • 1990
  • Ingår i: Animal Behaviour. - 0003-3472 .- 1095-8282. ; 39, s. 244-252
  • Tidskriftsartikel (refereegranskat)abstract
    • How important female choice is for the evolution of male secondary sexual characteristics is controversial. Two field and one laboratory experiment, using the pied flycatcher, were performed to test the female choice aspect of sexual selection. In addition, non-manipulative data from 5 years are presented. The observational data suggest a slight preference for dark males by females but in field experiments in which males had territories at random sites (i.e. they did not choose a territory) or the colour of concurrently arriving males was altered, there was no preference for darker ones. Similarly, oestradiol-treated females did not prefer black or brown males in the laboratory. Thus, there is little support for the idea that female choice has been an important mechanism in the evolution of sexual dichromatism in the pied flycatcher.
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  • Berglund, Anders (författare)
  • Sequential hermaphroditism and the size-advantage hypothesis: an experimental test
  • 1990
  • Ingår i: Animal Behaviour. - 0003-3472 .- 1095-8282. ; 39:3, s. 426-433
  • Tidskriftsartikel (refereegranskat)abstract
    • When members of one sex have a low reproductive success when small and a high reproductive success when large, while members of the opposite sex do relatively better when small and relatively worse when large, sequential hermaphroditism is commonly believed to be favoured by natural selection. This so-called size-advantage hypothesis has not been rigorously tested experimentally. For the hermaphrodite Ophryotrocha puerilis puerilis, a polychaete, in which small individuals are males and large ones females, the hypothesis predicts that reproductive success will increase less with body size for males than for females, eventually promoting sex change in males. Dry body weight of males was not correlated with reproductive rate, whereas there was a positive correlation for females in reproducing pairs. Furthermore, an increment in the size of females affected clutch size and reproductive rate more than did an equal increment in the size of males. Reproductive success of males decreased with size, because females preferred smaller males. At the same time, large males won contests for access to females, although female choice overrode this combat superiority. Therefore, after reaching a certain size a male would not benefit from staying male. Taking into account the relatively low cost of sex change in this species (about 5 days being lost, equivalent to one interbrood interval) sex reversal occurred as predicted by the size-advantage hypothesis.
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  • Göransson, Görgen, et al. (författare)
  • Male characteristics, viability, and harem size in a wild population of pheasants.
  • 1990
  • Ingår i: Animal Behaviour. - 0003-3472 .- 1095-8282. ; 40:1, s. 89-104
  • Tidskriftsartikel (refereegranskat)abstract
    • A population of pheasants was studied for 4 years in southern Sweden to determine how sexual selection operates among males. Morphological characters, viability, dominance, territory quality, date of territorial establishment, harem size and reproductive success of males were measured; 81 males and 101 females were radio-tracked. The spur length of males was the most important predictor of harem size. Phenotypic condition and viability were significantly related to spur length, the best single predictor of the reproductive success of males. These are the first data to show that a sexually selected male character correlates significantly with male viability. The results support models suggesting that viability-based processes can contribute to the evolution of mate choice and secondary sexual characters. 
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  • HOGLUND, J, et al. (författare)
  • MATE-CHOICE COPYING IN BLACK GROUSE
  • 1995
  • Ingår i: Animal Behaviour. - : Elsevier BV. - 0003-3472 .- 1095-8282. ; 49:6, s. 1627-1633
  • Tidskriftsartikel (refereegranskat)
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