Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories
Abstract: Age and experience affect key life-history traits, influencing evolutionary processes in a variety of ways. Timing of breeding in relation to optimal environmental conditions (e.g. peaks in prey availability) can also influence breeding success, and studies of closely-related, allochronic...
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Online Access: | https://dx.doi.org/10.48448/1j9x-mv66 https://underline.io/lecture/34808-age-specific-variation-in-demographic-traits-of-sympatric-seabirds-with-divergent-population-trajectories |
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ftdatacite:10.48448/1j9x-mv66 2023-05-15T13:56:44+02:00 Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories 3rd World Seabird Conference 2021 Gianuca, Dimas 2021 https://dx.doi.org/10.48448/1j9x-mv66 https://underline.io/lecture/34808-age-specific-variation-in-demographic-traits-of-sympatric-seabirds-with-divergent-population-trajectories unknown Underline Science Inc. Ecosystem Ecology FOS Biological sciences Climate Change MediaObject article Conference talk Audiovisual 2021 ftdatacite https://doi.org/10.48448/1j9x-mv66 2022-02-09T11:22:26Z Abstract: Age and experience affect key life-history traits, influencing evolutionary processes in a variety of ways. Timing of breeding in relation to optimal environmental conditions (e.g. peaks in prey availability) can also influence breeding success, and studies of closely-related, allochronic species may help disentangle the effects of phenological mismatch on ageing patterns. Here, we test for the effects of age and experience on the survival and reproduction of two long-lived seabirds with different timing of breeding and divergent population trajectories. At South Georgia, populations of the northern (NGP, Macronectes halli) and southern giant petrel (SGP, M. giganteus), are increasing and stable, respectively. In early adulthood, first-time breeders of both species had lower breeding success and annual survival. Breeding success improved markedly with age until around 20 years, driven by within-individual factors, but was lower in SGP which also experienced earlier reproductive senescence. Pre-fledging body mass in NGP showed a broadly quadratic relationship with parental age, suggesting that the age-specific pattern in breeding success was partially related to variation in foraging performance. Furthermore, pre-fledging body mass increased rapidly with parental age among first-time breeders in both species, but breeding success did not, further demonstrating the importance of foraging performance rather than breeding experience per se. Due to allochrony, NGP rear their chicks when the availability of seasonally-limited, high-calorie food (seal and penguin carrion) is higher. This would explain their delayed reproductive senescence and, potentially, improved performance in adulthood due to better neonatal nutrition. In addition, it contributes to the divergent population trajectories of the two species at South Georgia. These findings provide empirical evidence for the influence of phenological mismatch on reproductive senescence. Authors: Dimas Gianuca¹, Richard Phillips², Andrew Wood², Deborah Pardo², Stephen Votier³ ¹Projeto Albatroz, ²British Antarctic Survey, ³University of Exeter Article in Journal/Newspaper Antarc* Antarctic British Antarctic Survey Giant Petrel DataCite Metadata Store (German National Library of Science and Technology) Antarctic Giganteus ENVELOPE(62.500,62.500,-67.567,-67.567) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Ecosystem Ecology FOS Biological sciences Climate Change |
spellingShingle |
Ecosystem Ecology FOS Biological sciences Climate Change 3rd World Seabird Conference 2021 Gianuca, Dimas Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
topic_facet |
Ecosystem Ecology FOS Biological sciences Climate Change |
description |
Abstract: Age and experience affect key life-history traits, influencing evolutionary processes in a variety of ways. Timing of breeding in relation to optimal environmental conditions (e.g. peaks in prey availability) can also influence breeding success, and studies of closely-related, allochronic species may help disentangle the effects of phenological mismatch on ageing patterns. Here, we test for the effects of age and experience on the survival and reproduction of two long-lived seabirds with different timing of breeding and divergent population trajectories. At South Georgia, populations of the northern (NGP, Macronectes halli) and southern giant petrel (SGP, M. giganteus), are increasing and stable, respectively. In early adulthood, first-time breeders of both species had lower breeding success and annual survival. Breeding success improved markedly with age until around 20 years, driven by within-individual factors, but was lower in SGP which also experienced earlier reproductive senescence. Pre-fledging body mass in NGP showed a broadly quadratic relationship with parental age, suggesting that the age-specific pattern in breeding success was partially related to variation in foraging performance. Furthermore, pre-fledging body mass increased rapidly with parental age among first-time breeders in both species, but breeding success did not, further demonstrating the importance of foraging performance rather than breeding experience per se. Due to allochrony, NGP rear their chicks when the availability of seasonally-limited, high-calorie food (seal and penguin carrion) is higher. This would explain their delayed reproductive senescence and, potentially, improved performance in adulthood due to better neonatal nutrition. In addition, it contributes to the divergent population trajectories of the two species at South Georgia. These findings provide empirical evidence for the influence of phenological mismatch on reproductive senescence. Authors: Dimas Gianuca¹, Richard Phillips², Andrew Wood², Deborah Pardo², Stephen Votier³ ¹Projeto Albatroz, ²British Antarctic Survey, ³University of Exeter |
format |
Article in Journal/Newspaper |
author |
3rd World Seabird Conference 2021 Gianuca, Dimas |
author_facet |
3rd World Seabird Conference 2021 Gianuca, Dimas |
author_sort |
3rd World Seabird Conference 2021 |
title |
Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
title_short |
Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
title_full |
Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
title_fullStr |
Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
title_full_unstemmed |
Age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
title_sort |
age-specific variation in demographic traits of sympatric seabirds with divergent population trajectories |
publisher |
Underline Science Inc. |
publishDate |
2021 |
url |
https://dx.doi.org/10.48448/1j9x-mv66 https://underline.io/lecture/34808-age-specific-variation-in-demographic-traits-of-sympatric-seabirds-with-divergent-population-trajectories |
long_lat |
ENVELOPE(62.500,62.500,-67.567,-67.567) |
geographic |
Antarctic Giganteus |
geographic_facet |
Antarctic Giganteus |
genre |
Antarc* Antarctic British Antarctic Survey Giant Petrel |
genre_facet |
Antarc* Antarctic British Antarctic Survey Giant Petrel |
op_doi |
https://doi.org/10.48448/1j9x-mv66 |
_version_ |
1766264307644891136 |