The rate of senescence in maternal performance increases with early‐life fecundity in red deer

Nussey, Daniel H.; Kruuk, Loeske E. B.; Donald, Alison; Fowlie, M. K.; Clutton‐Brock, Tim

doi:10.1111/j.1461-0248.2006.00989.x

Cited by 223 publications

(278 citation statements)

References 44 publications

(51 reference statements)

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“…The within-individual repeatability of parturition date ranged from 0.54 to 0.93 among populations. In birds, repeatability of laying date range between 0.10 and 0.61 [18,19], whereas the only available value for a mammal was 0.10 (in red deer, derived from Nussey et al [10]), suggesting that repeatability in roe deer is particularly high. This high repeatability suggests a low level of phenotypic plasticity for this trait and, therefore, little potential for a rapid response to drastic changes.…”

Section: Discussionmentioning

confidence: 99%

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Parturition date for a given female is highly repeatable within five roe deer populations

et al. 2013

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Births are highly synchronized among females in many mammal populations in temperate areas. Although laying date for a given female is also repeatable within populations of birds, limited evidence suggests low repeatability of parturition date for individual females in mammals, and between-population variability in repeatability has never, to our knowledge, been assessed. We quantified the repeatability of parturition date for individual females in five populations of roe deer, which we found to vary between 0.54 and 0.93. Each year, some females gave birth consistently earlier in the year, whereas others gave birth consistently later. In addition, all females followed the same lifetime trajectory for parturition date, giving birth progressively earlier as they aged. Giving birth early should allow mothers to increase offspring survival, although few females managed to do so. The marked repeatability of parturition date in roe deer females is the highest ever reported for a mammal, suggesting low phenotypic plasticity in this trait.

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Section: Discussionmentioning

confidence: 99%

“…Estimated repeatability of laying date varies among bird species [9]. However, estimation of both within-and amongpopulation repeatability of parturition date has been overlooked in mammals (but see [10]). …”

Section: Introductionmentioning

confidence: 99%

Parturition date for a given female is highly repeatable within five roe deer populations

et al. 2013

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“…While a range of contributory effects, including additive genetic, non-additive genetic and permanent environmental effects have been demonstrated in some populations (e.g. Coulson et al 2006;Nussey et al 2006;Foerster et al 2007), simultaneous estimation of these effects while correcting for individual variation in age-specific reproductive trajectories will prove quite challenging. …”

Section: Discussionmentioning

confidence: 99%

“…Longitudinal studies over the whole lifespan that tease these effects apart remain very scarce in both mammals (Gaillard et al 1994;Nussey et al 2006) and birds (Cam et al 2002;Reid et al 2003). Here, we make use of an exceptional long-term dataset in the long-lived mute swan (Cygnus olor) to investigate within-individual changes with age in reproductive performance (laying date and clutch size) while controlling for potential covariance between individual quality and longevity.…”

Section: Introductionmentioning

confidence: 99%

Age-specific reproduction in a long-lived species: the combined effects of senescence and individual quality

et al. 2008

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Apparent changes in breeding performance with age measured at the population level can be due to changes in individual capacity at different ages, or to the differential survival of individuals with different capabilities. Estimating the relative importance of the two is important for understanding ageing patterns in natural populations, but there are few studies of such populations in which these effects have been disentangled. We analysed laying date and clutch size as measures of individual performance in a population of mute swans (Cygnus olor) studied over 25 years at Abbotsbury, UK. On both measures of breeding performance, individuals tended to improve up to the age of 6 or 7, and to decline after about the age of 12. Individuals with longer lifespans performed better at all ages (earlier laying, larger clutches) than animals that ceased breeding earlier. We conclude that the apparent mean increase in performance with age in mute swans is due to both individual improvement and differential survival of individuals who perform well, while the decline in older age groups is due to individual loss of function. Our results underline the need to take individual differences into account when testing hypotheses about life histories in wild populations.

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“…These traits were longevity, mean adult body condition, success at last breeding before death [three modalities: no reproduction code 0, reproduction but offspring died before the next summer code 1, and reproduction with offspring that survived code 2] and age at last reproduction). Longevity is often associated with performance in other life‐history traits (Nussey, Kruuk, Donald, Fowlie, & Clutton‐Brock, 2006) and is a commonly used trait to assess individual quality (Moyes et al., 2009; Espie, James, Oliphant, Warkentin, & Lieske, 2004; Hamel, Cote et al., 2009; Hamel, Gaillard et al., 2009; 2010; Weladji et al., 2006). Even if correlated, age at death and age at last reproduction differ for 28% of the females with a mean difference of 2.5 ± 1.05 years (maximum = 7 years).…”

Section: Methodsmentioning

confidence: 99%

Individual quality and age but not environmental or social conditions modulate costs of reproduction in a capital breeder

Debeffe

Poissant

McLoughlin

2017

Ecology and Evolution

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Costs associated with reproduction are widely known to play a role in the evolution of reproductive tactics with consequences to population and eco‐evolutionary dynamics. Evaluating these costs as they pertain to species in the wild remains an important goal of evolutionary ecology. Individual heterogeneity, including differences in individual quality (i.e., among‐individual differences in traits associated with survival and reproduction) or state, and variation in environmental and social conditions can modulate the costs of reproduction; however, few studies have considered effects of these factors simultaneously. Taking advantage of a detailed, long‐term dataset for a population of feral horses (Sable Island, Nova Scotia, Canada), we address the question of how intrinsic (quality, age), environmental (winter severity, location), and social conditions (group size, composition, sex ratio, density) influence the costs of reproduction on subsequent reproduction. Individual quality was measured using a multivariate analysis on a combination of four static and dynamic traits expected to depict heterogeneity in individual performance. Female quality and age interacted with reproductive status of the previous year to determine current reproductive effort, while no effect of social or environmental covariates was found. High‐quality females showed higher probabilities of giving birth and weaning their foal regardless of their reproductive status the previous year, while those of lower quality showed lower probabilities of producing foals in successive years. Middle‐aged (prime) females had the highest probability of giving birth when they had not reproduced the year before, but no such relationship with age was found among females that had reproduced the previous year, indicating that prime‐aged females bear higher costs of reproduction. We show that individual quality and age were key factors modulating the costs of reproduction in a capital breeder but that environmental or social conditions were not, highlighting the importance of considering multiple factors when studying costs of reproduction.

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The rate of senescence in maternal performance increases with early‐life fecundity in red deer

Cited by 223 publications

References 44 publications

Parturition date for a given female is highly repeatable within five roe deer populations

Parturition date for a given female is highly repeatable within five roe deer populations

Age-specific reproduction in a long-lived species: the combined effects of senescence and individual quality

Individual quality and age but not environmental or social conditions modulate costs of reproduction in a capital breeder

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