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| 2. |
- Hoglund, J, et al.
(författare)
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Behaviourally mediated sexual selection: Characteristics of successful male black grouse
- 1997
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Ingår i: ANIMAL BEHAVIOUR. - : ACADEMIC PRESS LTD. - 0003-3472. ; 54, s. 255-264
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Recent studies of lekking animals suggest that a suite of characters may be favoured by sexual selection. Examples of such traits are high survival, increased androgen levels, territory features and morphological characters including exaggerated morpholog
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| 3. |
- Komers, PE, et al.
(författare)
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Age at first reproduction in male fallow deer: Age-specific versus dominance-specific behaviors
- 1997
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Ingår i: BEHAVIORAL ECOLOGY. - : OXFORD UNIV PRESS INC. - 1045-2249. ; 8:4, s. 456-462
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The argument that an optimal age at first reproduction evolves where the benefits of reproduction outweigh the costs implies that where conditions change, age at first reproduction should also change. We studied six captive populations of allow deer (Dama
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| 4. |
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| 5. |
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| 6. |
- Pelabon, C., et al.
(författare)
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Do microsporidian parasites affect courtship in two-spotted gobies?
- 2005
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Ingår i: Marine Biology. - : Springer Science and Business Media LLC. - 0025-3162 .- 1432-1793. ; 148:1, s. 189-196
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Tidskriftsartikel (refereegranskat)abstract
- Courtship and body condition of male two-spotted gobies (Gobiusculus flavescens) harbouring naturally acquired microsporidian infections were compared with those of microsporidian-free males under standardized conditions in the lab. Although parasite infection had no apparent effect on individual condition, it significantly affected male courtship intensity. This effect, however, was affected by the intensity of the female courtship. Our study is one of the first to demonstrate a sub-lethal behavioural effect of a microsporidian parasite that could negatively affect the reproductive success of infected individuals. Our results also suggest that secondary sexual traits like courtship may be more sensitive to moderately detrimental effects of parasite infection than classical condition indices.
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| 7. |
- Pelabon, C, et al.
(författare)
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Social interactions of yearling male fallow deer during rut
- 1999
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Ingår i: ETHOLOGY. - : BLACKWELL WISSENSCHAFTS-VERLAG GMBH. - 0179-1613. ; 105:3, s. 247-258
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Despite a low probability of achieving copulations, yearling male (1.5-year-old) fallow deer Dama dama display behavioural changes during rut, interacting with both females and older males. Juvenile interactions in polygynous ungulates may affect further
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| 8. |
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| 9. |
- Svensson, P. Andreas, et al.
(författare)
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Does female nuptial coloration reflect egg carotenoids and clutch quality in the two-spotted goby (Gobiusculus flavescens, Gobiidae)?
- 2006
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Ingår i: Functional Ecology. - 0269-8463 .- 1365-2435. ; 20, s. 689-698
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Tidskriftsartikel (refereegranskat)abstract
- 1. Carotenoid based ornamentation has often been suggested to signal mate quality and species with such ornaments have frequently been used in studies of sexual selection. 2. FemaleGobiusculus flavescens(two-spotted goby) develop colourful orange bellies during the breeding season. Belly coloration varies among mature females, and previous work has shown nest holding males to prefer females with more colourful bellies. Since males invest heavily in offspring during incubation, the evolution of this preference can be explained if colourful females provide males with eggs of higher quality. 3. We tested this hypothesis by allowing males to spawn with 'colourful' and 'drab' females and comparing parameters including egg carotenoid concentration, clutch size, hatchability and larval viability between groups. We also investigated relationships between egg carotenoid concentration and clutch quality parameters. 4. Eggs from colourful females had higher concentrations of total carotenoids than eggs from drab females. Colourful females produced slightly larger clutches, but no measure of offspring quality differed between the two groups. Belly coloration quantified in photographs prior to spawning was a good predictor of egg carotenoid concentration, but there were no significant relationships between egg carotenoids and the measures of clutch quality. Females with high levels of egg carotenoids spawned slightly earlier, however, possibly because they were more ready to spawn or because of male mate choice. 5. We found that colourful females provided males with slightly larger clutches and eggs that contained more carotenoids, but despite this, the offspring were not of higher quality. Our results call into question the generality of a causal link between egg carotenoids and offspring quality.
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