Sexual Selection's Effects on Male Life History and the Pattern of Male Mortality

Clinton, Walter L.; Bœuf, Burney J. Le

doi:10.2307/1939945

Cited by 129 publications

(75 citation statements)

References 32 publications

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“…Armitage, unpublished data). The inability to detect costs of current reproduction with respect to future reproduction and survival is common among observational studies of natural populations (Reznick 1985; Clinton and Le Boeuf 1993). This is not to say that reproduction is not costly for male yellow-bellied marmots.…”

Section: Resultsmentioning

confidence: 99%

Reproductive energetics of adult male yellow-bellied marmots (Marmota flaviventris)

Salsbury¹,

Armitage²

1995

Can. J. Zool.

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We examined the energy expenditure of adult male yellow-bellied marmots (Marmora jlaviventn's) and its reLationship to various female-defense characteristics critical to male reproductive success. Resting metabolic rates of males were estimated in the laboratory via oxygen-consumption analysis, and field metabolic rates were estimated using a doubly Labeled water technique. Male home-range size, number of females defended by males, dispersion of females in the habitat, and date into the active season were considered to be predictors of male energy expenditure in excess of maintenance costs (field metabolic rate minus resting metabolic rate). Energy expenditure was best explained by a defensibility index based on the number and dispersion of females defended; expenditure increased with number and dispersion of females. Energy expenditure increased with date into the active season. Environmental constraints on male activity during the mating season may have led to a shift in male reproductive investment to later in the season, when intruder pressure by conspecifics increased. No short-term survival costs were associated with high energy expenditure; males appeared to engage in reproductive behaviors congruent with their physiological capabilities.Resume: Nous avons mesure la depense energetique chez des milles adultes de La Marmotte a ventre jaune (Marmota flaviventris) et examine sa reLation avec differentes caracteristiques associees a la defense des femelles, caracteristiques tres importantes pour Ie succes reproducteur des males. Les taux de metabolisme de base des males ont ete mesures en laboratoire par analyse de la consommation d'oxygtme et les taux de metabolisme en nature ont ete estimes au moyen d'une technique utilisant de l'eau doublement marquee. La taille du domaine vital des males, Ie nombre de femelles defendues par les males, la dispersion des femelles dans l'habitat et la date du debut de la saison d'activite ont servi d'indicateurs des couts energetiques excedant ceux relies au maintien chez les milles (taux de metabolisme en nature moins taux de metabolisme au repos). C'est un indice relie it La defense des femelles, indice base sur Ie nombre et la dispersion des femelles defendues, qui illustre Ie mieux la depense energetique: la depense augmente lorsque Ie nombre et la dispersion des femelles augmentent. La depense d'energie augmente aussi a mesure qu'avance la saison d'activite. Les contraintes ecologiques exercees sur L'activite des males par l'intrusion d'autres individus de La meme espece durant la saison de reproduction peut avoir entralne Ie renvoi de l'investissement reproducteur des males vers une date ulterieure. Aucune depense d'energie elevee ne semble etre associee it des couts de survie acourt terme; les males semblent s'engager dans des comportements reproducteurs correspondant aleurs capacites physiologiques.[Traduit par la Redaction]

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Section: Resultsmentioning

confidence: 99%

Reproductive energetics of adult male yellow-bellied marmots (Marmota flaviventris)

Salsbury¹,

Armitage²

1995

Can. J. Zool.

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“…Ralls et al (1980) highlighted the decrease in survival probability in males of some mammals around the time of the onset of social maturity. This decrease has been reported for a diverse array of male mammals, including fallow deer, but has never been statistically tested with CMR models (see reviews Ralls et al 1980;Clinton & Le Boeuf 1993;Jorgenson et al 1997;McElligott & Hayden 2000). We refer to it as the 'Rallslike' model or the 'Ralls effect' in table 1 (models 7, 10 and 13).…”

Section: (B) Statistical Analysesmentioning

confidence: 90%

Age-specific survival and reproductive probabilities: evidence for senescence in male fallow deer ( Dama dama )

McElligott

Altwegg

Hayden

2002

Proc. R. Soc. Lond. B

101

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Survival and reproduction are key features in the evolution of life-history strategies. In this study, we use capture-mark-resighting and multi-state models to examine survival senescence and reproductive senescence in six successive cohorts of fallow bucks that were studied for 16 years. We found that the overall age-specific survival probabilities of males were highly variable and the best-fitting model revealed that fallow bucks have four life-history stages: yearling, pre-reproductive, prime-age and senescent. Prereproductive males (2 and 3 years old) had the highest survival. Survival declined sharply after the age of 9 years, indicating that senescence had begun. When we considered reproducing and non-reproducing males separately, there was no evidence of senescence in the former, and steadily decreasing survival after the onset of social maturity in the latter. Reproduction probability also declined in older males, and thus we provide very strong evidence of senescence. Reproducers had a greater chance of reproducing again in the following year than non-reproducers. Furthermore, there were differences in the survival probabilities, with reproducers consistently surviving better than non-reproducers. In our study population, reproducers allocate more to the effort to reproduce than non-reproducers. Therefore our results indicate the generally higher phenotypic quality of reproducing males. These results, along with earlier studies on the same population, could indicate positive relationships between fitness correlates.

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“…In other words, reproductive costs themselves can be dependent on the age. For example, reproduction can be more costly in young individuals [76] or on the contrary more costly in old individuals [77], or appear more costly due to terminal investment [78]. Therefore, studies combining the information of age effects and life-history tradeoffs should be developed to strengthen comparative studies and to improve our general understanding of such patterns.…”

Section: Tests Of Direct Costs Of Reproduction In Malesmentioning

confidence: 99%

Reproductive costs in terrestrial male vertebrates: insights from bird studies

2016

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Reproduction requires resources that cannot be allocated to other functions resulting in direct reproductive costs (i.e. trade-offs between current reproduction and subsequent survival/reproduction). In wild vertebrates, direct reproductive costs have been widely described in females, but their occurrence in males remains to be explored. To fill this gap, we gathered 53 studies on 48 species testing direct reproductive costs in male vertebrates. We found a trade-off between current reproduction and subsequent performances in 29% of the species and in every clade. As 73% of the studied species are birds, we focused on that clade to investigate whether such trade-offs are associated with (i) levels of paternal care, (ii) polygyny or (iii) pace of life. More precisely for this third question, it is expected that fast species (i.e. short lifespan, early maturity, high fecundity) pay a cost in terms of survival, whereas slow species (with opposite characteristics) do so in terms of fecundity. Our findings tend to support this hypothesis. Finally, we pointed out the potential confounding effects that should be accounted for when investigating reproductive costs in males and strongly encourage the investigation of such costs in more clades to understand to what extent our results are relevant for other vertebrates.

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Sexual Selection's Effects on Male Life History and the Pattern of Male Mortality

Cited by 129 publications

References 32 publications

Reproductive energetics of adult male yellow-bellied marmots (Marmota flaviventris)

Reproductive energetics of adult male yellow-bellied marmots (Marmota flaviventris)

Age-specific survival and reproductive probabilities: evidence for senescence in male fallow deer ( Dama dama )

Reproductive costs in terrestrial male vertebrates: insights from bird studies

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