Effects of known age on male paternity in a migratory songbird

Tarof, Scott A.; Kramer, Patrick M.; Tautin, John; Stutchbury, Bridget J. M.

doi:10.1093/beheco/arr188

Cited by 12 publications

(8 citation statements)

References 44 publications

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“…Age‐dependent paternity success, a change with age in the number of offspring sired by a male, has been described in many taxa (Hoikkala et al ., ; Carazo et al ., ; Schroeder et al ., ; Tarof et al ., ; Lebigre et al ., ). Generally, male reproductive success increases with age and then declines later in life (Mauck et al ., ; Willisch et al ., ; Froy et al ., ).…”

Section: Introductionmentioning

confidence: 98%

Age‐dependent trajectories differ between within‐pair and extra‐pair paternity success

Hsu

Simons

Schroeder

et al. 2017

J of Evolutionary Biology

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Reproductive success is associated with age in many taxa, increasing in early life followed by reproductive senescence. In socially monogamous but genetically polygamous species, this generates the interesting possibility of differential trajectories of within-pair and extra-pair siring success with age in males. We investigate these relationships simultaneously using withinindividual analyses with 13 years of data from an insular house sparrow (Passer domesticus) population. As expected, we found that both within-and extra-pair paternity success increased with age, followed by a senescencelike decline. However, the age trajectories of within-and extra-pair paternity successes differed significantly, with the extra-pair paternity success increasing faster, although not significantly, in early life, and showing a delayed decline by 1.5 years on average later in life compared to within-pair paternity success. These different trajectories indicate that the two alternative mating tactics should have age-dependent pay-offs. Males may partition their reproductive effort between within-and extra-pair matings depending on their current age to reap the maximal combined benefit from both strategies. The interplay between these mating strategies and age-specific mortality may explain the variation in rates of extra-pair paternity observed within and between species.

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Section: Introductionmentioning

confidence: 98%

Age‐dependent trajectories differ between within‐pair and extra‐pair paternity success

Hsu

Simons

Schroeder

et al. 2017

J of Evolutionary Biology

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“…There are two ways that density‐dependent dispersal can affect genetic structure (a) via dispersal movements: distance and immigration (rate and/or proportion of population), and (b) via fitness consequences for immigrants (Orell et al, ) and/or recruits (Tarof, Kramer, Tautin, & Stuctchbury, ). Previous research on density‐dependent dispersal has almost exclusively focused on density‐dependent dispersal movements, showing emigration rates and distances can be affected by predispersal density (reviewed in Matthysen, but see Busch et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…There are two ways that density-dependent dispersal can affect genetic structure (a) via dispersal movements: distance and immigration (rate and/or proportion of population), and (b) via fitness consequences for immigrants (Orell et al, 1999) and/or recruits (Tarof, Kramer, Tautin, & Stuctchbury, 2012 F I G U R E 5 Density did not affect the proportion of juveniles that returned (F 1,9 = 0.39, p = 0.691, R 2 = 0.10, n years = 10) but did affect the proportion of adults that were returned juveniles (F 1,9 = 5.20, p = 0.041, R 2 = 0.60, n years = 10). Total numbers of juveniles and adults are presented in Figure 1.…”

Section: Discussionmentioning

confidence: 99%

Density‐dependent fitness, not dispersal movements, drives temporal variation in spatial genetic structure in dark‐eyed juncos (Junco hyemalis)

2019

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Some studies have found that dispersal rates and distances increase with density, indicating that density‐dependent dispersal likely affects spatial genetic structure. In an 11‐year mark–recapture study on a passerine, the dark‐eyed junco, we tested whether density affected dispersal distance and/or fine‐scale spatial genetic structure. Contrary to expectations, we found no effect of predispersal density on dispersal distance or the proportion of locally produced juveniles returning to the population from which they hatched. However, even though density did not affect dispersal distance or natal return rates, we found that density still did affect spatial genetic structure. We found significant positive spatial genetic structure at low densities of (postdispersal) adults but not at high densities. In years with high postdispersal (adult) densities that also had high predispersal (juvenile) densities in the previous year, we found negative spatial genetic structure, indicating high levels of dispersal. We found that density also affected fitness of recruits, and fitness of immigrants, potentially linking these population parameters with the spatial genetic structure detected. Immigrants and recruits rarely nested in low postdispersal density years. In contrast, in years with high postdispersal density, recruits were common and immigrants had equal success to local birds, so novel genotypes diluted the gene pool and effectively eliminated positive spatial genetic structure. In relation to fine‐scale spatial genetic structure, fitness of immigrants and new recruits is poorly understood compared to dispersal movements, but we conclude that it can have implications for the spatial distribution of genotypes in populations.

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“…The proximate mechanisms responsible for the positive association of male age with extra-pair paternity are unclear. It has been suggested that older males might outcompete younger males for extra-pair mating opportunities 7 , 8 or that females may simply prefer older males as extra-pair partners 9 , 10 . Alternatively, older males might outcompete younger males post-copulatory through better sperm competition 11 .…”

Section: Introductionmentioning

confidence: 99%

Male age is associated with extra-pair paternity, but not with extra-pair mating behaviour

Girndt

Chng

Burke

et al. 2018

Sci Rep

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Extra-pair paternity is the result of copulation between a female and a male other than her social partner. In socially monogamous birds, old males are most likely to sire extra-pair offspring. The male manipulation and female choice hypotheses predict that age-specific male mating behaviour could explain this old-over-young male advantage. These hypotheses have been difficult to test because copulations and the individuals involved are hard to observe. Here, we studied the mating behaviour and pairing contexts of captive house sparrows, Passer domesticus. Our set-up mimicked the complex social environment experienced by wild house sparrows. We found that middle-aged males, which would be considered old in natural populations, gained most extra-pair paternity. However, both, female solicitation behaviour and subsequent extra-pair matings were not associated with male age. Further, copulations were more likely when solicited by females than when initiated by males (i.e. unsolicited copulations). Male initiated within-pair copulations were more common than male initiated extra-pair copulations. To conclude, our results did not support either hypothesis regarding age-specific male mating behaviour. Instead, female choice, independent of male age, governed copulation success, especially in an extra-pair context. Post-copulatory mechanisms might determine why older males sire more extra-pair offspring.

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Effects of known age on male paternity in a migratory songbird

Cited by 12 publications

References 44 publications

Age‐dependent trajectories differ between within‐pair and extra‐pair paternity success

Age‐dependent trajectories differ between within‐pair and extra‐pair paternity success

Density‐dependent fitness, not dispersal movements, drives temporal variation in spatial genetic structure in dark‐eyed juncos (Junco hyemalis)

Male age is associated with extra-pair paternity, but not with extra-pair mating behaviour

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