Evidence of age-related improvement in the foraging efficiency of Adélie penguins

Amélie Lescroël, Grant Ballard, Melanie Massaro, Katie Dugger, Scott Jennings, Annie Pollard, Elizabeth Porzig, Annie Schmidt, Arvind Varsani, David Grémillet, David Ainley

Research output: Contribution to journalArticle

Abstract

Age variation in reproductive performance is well-documented but the mechanisms underlying this variation remain unclear. Foraging efficiency is likely to be a key source of demographic variation as it determines the amount of energy that can be invested in fitness-related activities. Evidence of age-related changes in the foraging efficiency of adult seabirds is scarce and inconsistent. We investigated the effects of age on the foraging efficiency of breeding Adélie penguins, a relatively short-lived seabird species, in order to gain a broader perspective on the processes driving variation in ageing rates. We found support for a positive effect of age, either linear or levelling off at old ages, on both our proxies for daily catch rate and catch per unit effort. Across all age classes, males were more performant foragers than females. We found no strong evidence for differing ageing patterns between sexes or individual quality levels, and no evidence for senescence. We infer that continuous individual improvement could be responsible for a larger amount of the variation in foraging efficiency with age at our study site, compared with selective disappearance of underperforming phenotypes. The different results reported by other studies highlight the need to conduct longitudinal studies across a range of species in different environments.

Original languageEnglish (US)
Article number3375
JournalScientific reports
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2019

Fingerprint

Spheniscidae
Proxy
Breeding
Longitudinal Studies
Demography
Phenotype

ASJC Scopus subject areas

  • General

Cite this

Lescroël, A., Ballard, G., Massaro, M., Dugger, K., Jennings, S., Pollard, A., ... Ainley, D. (2019). Evidence of age-related improvement in the foraging efficiency of Adélie penguins. Scientific reports, 9(1), [3375]. https://doi.org/10.1038/s41598-019-39814-x

Evidence of age-related improvement in the foraging efficiency of Adélie penguins. / Lescroël, Amélie; Ballard, Grant; Massaro, Melanie; Dugger, Katie; Jennings, Scott; Pollard, Annie; Porzig, Elizabeth; Schmidt, Annie; Varsani, Arvind; Grémillet, David; Ainley, David.

In: Scientific reports, Vol. 9, No. 1, 3375, 01.12.2019.

Research output: Contribution to journalArticle

Lescroël, A, Ballard, G, Massaro, M, Dugger, K, Jennings, S, Pollard, A, Porzig, E, Schmidt, A, Varsani, A, Grémillet, D & Ainley, D 2019, 'Evidence of age-related improvement in the foraging efficiency of Adélie penguins', Scientific reports, vol. 9, no. 1, 3375. https://doi.org/10.1038/s41598-019-39814-x
Lescroël A, Ballard G, Massaro M, Dugger K, Jennings S, Pollard A et al. Evidence of age-related improvement in the foraging efficiency of Adélie penguins. Scientific reports. 2019 Dec 1;9(1). 3375. https://doi.org/10.1038/s41598-019-39814-x
Lescroël, Amélie ; Ballard, Grant ; Massaro, Melanie ; Dugger, Katie ; Jennings, Scott ; Pollard, Annie ; Porzig, Elizabeth ; Schmidt, Annie ; Varsani, Arvind ; Grémillet, David ; Ainley, David. / Evidence of age-related improvement in the foraging efficiency of Adélie penguins. In: Scientific reports. 2019 ; Vol. 9, No. 1.
@article{f642baaeec2749739828f86106d78108,
title = "Evidence of age-related improvement in the foraging efficiency of Ad{\'e}lie penguins",
abstract = "Age variation in reproductive performance is well-documented but the mechanisms underlying this variation remain unclear. Foraging efficiency is likely to be a key source of demographic variation as it determines the amount of energy that can be invested in fitness-related activities. Evidence of age-related changes in the foraging efficiency of adult seabirds is scarce and inconsistent. We investigated the effects of age on the foraging efficiency of breeding Ad{\'e}lie penguins, a relatively short-lived seabird species, in order to gain a broader perspective on the processes driving variation in ageing rates. We found support for a positive effect of age, either linear or levelling off at old ages, on both our proxies for daily catch rate and catch per unit effort. Across all age classes, males were more performant foragers than females. We found no strong evidence for differing ageing patterns between sexes or individual quality levels, and no evidence for senescence. We infer that continuous individual improvement could be responsible for a larger amount of the variation in foraging efficiency with age at our study site, compared with selective disappearance of underperforming phenotypes. The different results reported by other studies highlight the need to conduct longitudinal studies across a range of species in different environments.",
author = "Am{\'e}lie Lescro{\"e}l and Grant Ballard and Melanie Massaro and Katie Dugger and Scott Jennings and Annie Pollard and Elizabeth Porzig and Annie Schmidt and Arvind Varsani and David Gr{\'e}millet and David Ainley",
year = "2019",
month = "12",
day = "1",
doi = "10.1038/s41598-019-39814-x",
language = "English (US)",
volume = "9",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",
number = "1",

}

TY - JOUR

T1 - Evidence of age-related improvement in the foraging efficiency of Adélie penguins

AU - Lescroël, Amélie

AU - Ballard, Grant

AU - Massaro, Melanie

AU - Dugger, Katie

AU - Jennings, Scott

AU - Pollard, Annie

AU - Porzig, Elizabeth

AU - Schmidt, Annie

AU - Varsani, Arvind

AU - Grémillet, David

AU - Ainley, David

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Age variation in reproductive performance is well-documented but the mechanisms underlying this variation remain unclear. Foraging efficiency is likely to be a key source of demographic variation as it determines the amount of energy that can be invested in fitness-related activities. Evidence of age-related changes in the foraging efficiency of adult seabirds is scarce and inconsistent. We investigated the effects of age on the foraging efficiency of breeding Adélie penguins, a relatively short-lived seabird species, in order to gain a broader perspective on the processes driving variation in ageing rates. We found support for a positive effect of age, either linear or levelling off at old ages, on both our proxies for daily catch rate and catch per unit effort. Across all age classes, males were more performant foragers than females. We found no strong evidence for differing ageing patterns between sexes or individual quality levels, and no evidence for senescence. We infer that continuous individual improvement could be responsible for a larger amount of the variation in foraging efficiency with age at our study site, compared with selective disappearance of underperforming phenotypes. The different results reported by other studies highlight the need to conduct longitudinal studies across a range of species in different environments.

AB - Age variation in reproductive performance is well-documented but the mechanisms underlying this variation remain unclear. Foraging efficiency is likely to be a key source of demographic variation as it determines the amount of energy that can be invested in fitness-related activities. Evidence of age-related changes in the foraging efficiency of adult seabirds is scarce and inconsistent. We investigated the effects of age on the foraging efficiency of breeding Adélie penguins, a relatively short-lived seabird species, in order to gain a broader perspective on the processes driving variation in ageing rates. We found support for a positive effect of age, either linear or levelling off at old ages, on both our proxies for daily catch rate and catch per unit effort. Across all age classes, males were more performant foragers than females. We found no strong evidence for differing ageing patterns between sexes or individual quality levels, and no evidence for senescence. We infer that continuous individual improvement could be responsible for a larger amount of the variation in foraging efficiency with age at our study site, compared with selective disappearance of underperforming phenotypes. The different results reported by other studies highlight the need to conduct longitudinal studies across a range of species in different environments.

UR - http://www.scopus.com/inward/record.url?scp=85062423283&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062423283&partnerID=8YFLogxK

U2 - 10.1038/s41598-019-39814-x

DO - 10.1038/s41598-019-39814-x

M3 - Article

VL - 9

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 3375

ER -