Why de young birds reproduce less well?

Curio, Eberhard

doi:10.1111/j.1474-919x.1983.tb03130.x

Cited by 467 publications

(309 citation statements)

References 12 publications

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“…Consistent with the expectation that the expression of morphological and behavioral traits is constrained in young individuals (Curio 1983), we found that the greatest change in trait values occurred from yearlings to 2-yearold males. During the first 6 months of their life, male black grouse grow rapidly, increasing their body mass approximately 50-fold.…”

Section: Effects Of Age On Trait Expressionsupporting

confidence: 74%

Life-History Differences in Age-Dependent Expressions of Multiple Ornaments and Behaviors in a Lekking Bird

Kervinen

Lebigre

Alatalo

et al. 2015

The American Naturalist

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Online enhancements: supplementary tables and figure. Dryad data: http://dx.doi.org/10.5061/dryad.rg8d4.abstract: Age is a major factor explaining variation in life-history traits among individuals with typical patterns of increasing trait values early in life, maximum trait expression, and senescence. However, age-dependent variation in the expressions of sexually selected traits has received less attention, although such variation underpins differences in male competitive abilities and female preference, which are central to sexual selection. In contrast to previous studies focusing on single traits, we used repeated measures of seven sexually selected morphological and behavioral traits in male black grouse (Tetrao tetrix) to quantify the effects of age and life span on their expressions and quantified this variation in relation to male reproductive effort. Trait expression increased with age, but long-lived males had a slower increase and delayed maxima in trait values compared with shortlived males. There was evidence of terminal investment (increasing trait values during the last breeding season) in some traits and senescence in all traits. These trait dynamics were largely explained by the timing of male peak lekking effort. This study shows that fully understanding the variation in sexually selected traits and fitness benefits associated with sexual selection requires accounting for the complex interaction among individual age, life span, and the timing of individuals' investment in reproduction.

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Section: Effects Of Age On Trait Expressionsupporting

confidence: 74%

Life-History Differences in Age-Dependent Expressions of Multiple Ornaments and Behaviors in a Lekking Bird

Kervinen

Lebigre

Alatalo

et al. 2015

The American Naturalist

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“…This early improvement in mean reproductive success can be explained by a number of different mechanisms (Lack 1966;Forslund & Pärt 1995). First, there may be progressive disappearance of poor-quality breeders (selection hypothesis, Curio 1983) or progressive appearance of good quality breeders (delayed breeding hypothesis; Forslund & Pärt 1995). In these cases of individual heterogeneity, age-specific population trends in breeding performance may differ markedly from individual changes in breeding performance.…”

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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“…variation between patch quality at the interpopulation level or between years in a given patch, hereafter referred to as the distant extrinsic variation); (ii) variation in environmental quality affecting the individuals of a given population differently (e.g. heterogeneity of breeding site quality within the patch, hereafter, proximal extrinsic variation); (iii) variation in quality among reproducing pairs (hereafter referred to as the intrinsic variation), related either to the variance in the additive qualities of the pair members [4,5] or to their genetic compatibility [6].…”

Section: Introductionmentioning

confidence: 99%

Nest fidelity is driven by multi-scale information in a long-lived seabird

et al. 2014

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Although the reproductive success of most organisms depends on factors acting at several spatial scales, little is known about how organisms are able to synthesize multi-scale information to optimize reproduction. Using longitudinal data from a long-lived seabird, Monteiro's storm-petrel, we show that average breeding success is strongly related to oceanic conditions at the population level, and we postulate that (i) individuals use proximal information (their own reproduction outcome in year t) to assess the qualities of their mate and nest and to decide to retain them or not in year t þ 1; (ii) the intensity of these responses depends on the quality of the oceanic environment in year t, which affects the predictability of reproduction outcome in year t þ 1. Our results confirm that mate and nest fidelities are higher following successful reproduction and that the relationship between the success of a given pair and subsequent nest fidelity is stronger in years with unfavourable oceanic conditions, suggesting that individuals rely on distant information to modulate their use of proximal information and adjust their breeding strategy.

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Why de young birds reproduce less well?

Cited by 467 publications

References 12 publications

Life-History Differences in Age-Dependent Expressions of Multiple Ornaments and Behaviors in a Lekking Bird

Life-History Differences in Age-Dependent Expressions of Multiple Ornaments and Behaviors in a Lekking Bird

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

Nest fidelity is driven by multi-scale information in a long-lived seabird

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