AGE-DEPENDENT BREEDING PERFORMANCE IN MERLINS(<i>FALCO COLUMBARIUS</i>)

Espie, Richard H. M.; Oliphant, Lynn W.; James, Preston E.; Warkentin, Ian G.; Lieske, David J.

doi:10.1890/0012-9658(2000)081[3404:adbpim]2.0.co;2

Cited by 43 publications

(11 citation statements)

References 56 publications

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“…Recently, several studies demonstrating senescence in free-living organisms through measurements of age-dependent mortality, reproduction and reproductive value have been published [e.g., Gustafsson and Pärt (1990); Perdeck and Cavé (1992); Newton and Rothery (1997); Bérubé et al (1999); Møller and de Lope (1999); Espie et al (2000); Sanz and Moreno (2000); Pyle et al (2001); Robertson and Rendell (2001); Cam et al (2002); Laaksonen et al (2002); Orell and Belda (2002); Reid et al (2003)]. Several of these studies have investigated patterns of age-specific fecundity and mortality, showing how reproductive performance and survival late in life are related to early performance.…”

Section: Introductionmentioning

confidence: 99%

Reproduction and migration in relation to senescence in the barn swallow Hirundo rustica: A study of avian ‘centenarians’

Møller

Lope

Saino

2005

AGE

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A. P. Moller, F. de Lope and N. Saino: Reproduction and migration in relation to senescence in the barn swallow Hirundo rustica: A study of avian Fcentenarians_. Senescence reflects the decrease in age-dependent residual reproductive value, and a previous study of a cohort of migratory barn swallows (Hirundo rustica) that had reached advanced ages for this species (at least five years old) provided evidence consistent with senescence such as reduced reproductive performance and increased abundance of parasites. We studied a population of migratory barn swallows over a number of years. Several questions were asked including 1) how do longer lived birds compare to shorter lived individuals of the same species, 2) is there a difference in individuals of the same species that live in different geographical regions, and 3) how do patterns of reproduction change during aging? We compared the phenotypes of 87 individuals from three populations in Denmark, Italy and Spain that had reached at least five years old with those of control individuals matched for sex, arrival date and breeding site. These controls only became one year old, i.e., they were not found thereafter and both groups of individuals were compared in their first year of life. Results showed that there were no significant differences in any of 11 morphological characters or in the abundance of three ectoparasites between the two groups of birds. Females that eventually became very old had relatively smaller first clutches as one year olds than did one year old controls, while males that eventually became very old had mates that laid clutches that were relatively larger than those of controls. Annual fecundity showed a similar pattern, with an increased sex difference in fecundity between birds from Spain than in Italy and in Denmark. Danish barn swallows that achieved older ages had relatively lower haematocrits than control individuals of the same sex, age and arrival date captured at the same site, while the difference in haematocrits between these two categories of individuals was small for Italian birds. Spring arrival date was relatively earlier in Danish males that eventually became very old compared to control males of the same age and tail length (a correlate of fitness) that arrived at the same site, while the two age categories of females did not differ in arrival date. In the Spanish population there was no difference in arrival date between the birds that aged most successfully and controls for either sex. We will discuss these findings in relation to current senescence theories.

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Section: Introductionmentioning

confidence: 99%

Reproduction and migration in relation to senescence in the barn swallow Hirundo rustica: A study of avian ‘centenarians’

Møller

Lope

Saino

2005

AGE

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“…This lack of recent work may be due in part to difficulties of adequately measuring LRS in species with high dispersal potential (Lambrechts et al 1999), and possibly because variation in LRS is apparently driven largely by chance events rather than by heritable variation in individual traits. However, convincing evidence from several avian taxa suggests that number of breeding attempts (i.e., longevity) is a principal factor influencing LRS (e.g., Espie et al 2000), perhaps prompting greater attention on causes of survival variation.…”

Section: Introductionmentioning

confidence: 99%

Correlates of lifetime reproductive success in three species of European ducks

Blums

Clark²

2004

Oecologia

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Number of breeding attempts is a strong correlate of lifetime reproductive success (LRS) in birds, but the relative importance of potentially interacting factors affecting LRS has rarely been fully evaluated. We considered simultaneously five main factors hypothesized to influence LRS (age at first breeding, nesting date, number of breeding attempts, female traits, brood parasitism) by analyzing with path analysis 22-year data sets for 1,279 individually marked females and their offspring in tufted duck ( Aythya fuligula), common pochard ( A. ferina) and northern shoveler (Anas clypeata). We recaptured marked offspring as breeding adults (n=496 females) and obtained more complete estimates of LRS by incorporating information about banded ducklings of both sexes shot by hunters > or =12 months after banding (n=138). In tufted ducks and especially pochard (both diving duck species), late-hatched females tended to delay nesting until 2-years old. Most females (tufted duck, 74%; pochard, 71%; shoveler, 59%) apparently produced no breeding-age offspring. Number of breeding attempts (i.e., longevity) was the strongest correlate of LRS in all species, after controlling effects of age at first breeding, relative nest initiation date, wing length and body mass. Percentage of females producing recruits increased gradually with number of breeding attempts for all three species. Also, as expected, females nesting early in the breeding season had higher LRS than late-nesting individuals. In shoveler, female-specific characteristics of relatively longer wings and heavier late incubation body mass had positive effects on LRS, the latter feature being more common in 2-year-old nesters. In diving ducks, no relationships were detected between LRS and female-specific traits like wing length or body mass, and nor did acceptance of parasitic eggs have any deleterious impact on fitness estimates. Overall, number of fledged ducklings and LRS were related in tufted duck, weakly associated in pochard and unrelated in shoveler, implying that fledging success is not always a reliable measure of LRS.

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“…Early breeding generally increases breeding performance, and this is usually attributed to the older age or experience of pairs (Viñ uela 1993, Espie et al 2000. However, increasing population density may lead to a densitydependent regulation of breeding performance, which is usually driven by a territorial behaviour mechanism (Rodenhouse et al 1997), as previously described for different territorial raptor species (Ferrer & Donázar 1996, Carrete et al 2006.…”

mentioning

confidence: 87%