Bateman gradients in a promiscuous mating system

Bergeron, Patrick; Montiglio, Pierre‐Olivier; Réale, Denis; Humphries, Murray M.; Garant, Dany

doi:10.1007/s00265-012-1364-x

Cited by 19 publications

(15 citation statements)

References 29 publications

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“…We found that the opportunity for selection and for sexual selection observed for resident male and female blue tits fell within the lower range of estimates from other studies on vertebrates (Pröhl and Hödl 1999;Jones et al 2002;Woolfenden et al 2002;Mobley and Jones 2007;Schlicht and Kempenaers 2010;Bergeron et al 2012;Courtiol et al 2012). However, most previous studies did not consider the influence of random mating (but see Baena and Macías-Ordóñez 2012;Byers and Dunn 2012;Garg et al 2012).…”

Section: In Blue Titssupporting

confidence: 74%

EFFECTS OF SOCIAL AND EXTRA-PAIR MATING ON SEXUAL SELECTION IN BLUE TITS (CYANISTES CAERULEUS)

Schlicht

Kempenaers

2013

Evolution

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The contribution of extra-pair paternity (EPP) to sexual selection has received considerable attention, particularly in socially monogamous species. However, the importance of EPP remains difficult to assess quantitatively, especially when many extra-pair young have unknown sires. Here, we combine measurements of the opportunity for selection (I), the opportunity for sexual selection (I S ), and the strength of selection on mating success (Bateman gradient, β SS ) with a novel simulation of random mating tailored to the specific mating system of the blue tit (Cyanistes caeruleus). In a population where social polygyny and EPP are common, the opportunity for sexual selection was significantly stronger and Bateman gradients significantly steeper for resident males than for females. In general, success with the social mate(s) contributed most to variation in male reproductive success.Effects of EPP were small, but significantly higher than expected under random mating. We used sibship analysis to estimate the number of unknown sires in our population. Under the assumption that the unknown sires are nonbreeding males, EPP reduced the variance in and the strength of selection on mating success, a possibility that hitherto has not been considered.

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Section: In Blue Titssupporting

confidence: 74%

EFFECTS OF SOCIAL AND EXTRA-PAIR MATING ON SEXUAL SELECTION IN BLUE TITS (CYANISTES CAERULEUS)

Schlicht

Kempenaers

2013

Evolution

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“…A very high incidence of multiple paternity has been reported in the yellow-pine chipmunk (T. amoenus), with more than 90% of litters sired by multiple males . Such high levels of promiscuity could result in intense sexual selection through direct sperm competition and female choice (but see , and indeed eastern chipmunks (T. striatus) exhibit significant positive Bateman gradients for both genders (Bergeron et al, 2012). Consistent with this, patterns of variation for several reproductive characters within and between species (White, 1953) suggest a strong influence of sexual selection.…”

Section: Study Systemmentioning

confidence: 91%

Divergence with gene flow within the recent chipmunk radiation (Tamias)

et al. 2014

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Increasing data have supported the importance of divergence with gene flow (DGF) in the generation of biological diversity. In such cases, lineage divergence occurs on a shorter timescale than does the completion of reproductive isolation. Although it is critical to explore the mechanisms driving divergence and preventing homogenization by hybridization, it is equally important to document cases of DGF in nature. Here we synthesize data that have accumulated over the last dozen or so years on DGF in the chipmunk (Tamias) radiation with new data that quantify very high rates of mitochondrial DNA (mtDNA) introgression among para-and sympatric species in the T. quadrivittatus group in the central and southern Rocky Mountains. These new data (188 cytochrome b sequences) bring the total number of sequences up to 1871; roughly 16% (298) of the chipmunks we have sequenced exhibit introgressed mtDNA. This includes ongoing introgression between subspecies and between both closely related and distantly related taxa. In addition, we have identified several taxa that are apparently fixed for ancient introgressions and in which there is no evidence of ongoing introgression. A recurrent observation is that these introgressions occur between ecologically and morphologically diverged, sometimes non-sister taxa that engage in well-documented niche partitioning. Thus, the chipmunk radiation in western North America represents an excellent mammalian example of speciation in the face of recurrent gene flow among lineages and where biogeography, habitat differentiation and mating systems suggest important roles for both ecological and sexual selection.

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“…Hence, we considered the number of offspring attributed to a male as an index of male reproductive success at each season (referred to as number of young produced, thereafter) and controlled for potential biases in the reproductive success of males by weighing each male's observation as a function of its position on the study site (see statistical analyses). This metric is also a good proxy of the number of mating partners obtained by a male (Bergeron et al 2012). …”

Section: Reproductionmentioning

confidence: 99%

Intra-individual variability in fecal cortisol metabolites varies with lifetime exploration and reproductive life history in eastern chipmunks (Tamias striatus)

Montiglio

Garant

Pelletier

et al. 2014

Behav Ecol Sociobiol

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Understanding the mechanistic links between individual variation in life history and behavior is a major challenge in evolutionary ecology. Glucocorticoids (GC) play a major role in this link through their baseline levels into the blood and their implication in stress responses to environmental perturbations. However, very few studies have investigated the long-term joint relationships between GC stress reactivity, life history, and behavior in natural conditions. Here, we took advantage of the behavioral and life history differences among individual males and females of a wild population of eastern chipmunks (Tamias striatus): We investigated how individual exploration, age, and reproduction were linked to level and intra-individual variability (IIV) of fecal cortisol metabolites over a 5-month period. Our analyses revealed that female cortisol levels decreased during gestation and lactation compared with non-reproductive females. We also found that slower exploring females and females with a smaller litter displayed higher IIV in fecal cortisol metabolites. For males, fecal cortisol metabolites level during the mating season increased with the number of offspring produced and decreased with age. Our study highlights the necessity of considering simultaneously seasonal fluctuations in GC level and the dynamics of stress reactivity in the study of life history and behavioral co-adaptations within natural populations.

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Bateman gradients in a promiscuous mating system

Cited by 19 publications

References 29 publications

EFFECTS OF SOCIAL AND EXTRA-PAIR MATING ON SEXUAL SELECTION IN BLUE TITS (CYANISTES CAERULEUS)

EFFECTS OF SOCIAL AND EXTRA-PAIR MATING ON SEXUAL SELECTION IN BLUE TITS (CYANISTES CAERULEUS)

Divergence with gene flow within the recent chipmunk radiation (Tamias)

Intra-individual variability in fecal cortisol metabolites varies with lifetime exploration and reproductive life history in eastern chipmunks (Tamias striatus)

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