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Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies

Optimization of clutch size and timing of reproduction have substantial effects on lifetime reproductive success in vertebrates, and both individual quality and environmental variation may impact life history strategies. We tested hypotheses related to maternal investment and timing of reproduction,...

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Autores principales: Eriksen, Lasse Frost, Ringsby, Thor Harald, Pedersen, Hans Chr., Nilsen, Erlend B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10206478/
https://www.ncbi.nlm.nih.gov/pubmed/37234506
http://dx.doi.org/10.1098/rsos.221427
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author Eriksen, Lasse Frost
Ringsby, Thor Harald
Pedersen, Hans Chr.
Nilsen, Erlend B.
author_facet Eriksen, Lasse Frost
Ringsby, Thor Harald
Pedersen, Hans Chr.
Nilsen, Erlend B.
author_sort Eriksen, Lasse Frost
collection PubMed
description Optimization of clutch size and timing of reproduction have substantial effects on lifetime reproductive success in vertebrates, and both individual quality and environmental variation may impact life history strategies. We tested hypotheses related to maternal investment and timing of reproduction, using 17 years (1978–1994) of individual-based life history data on willow ptarmigan (Lagopus l. lagopus, n = 290 breeding females with n = 319 breeding attempts) in central Norway. We analysed whether climatic variation and individual state variables (age and body mass) affected the number of offspring and timing of reproduction, and individual repeatability in strategies. The results suggest that willow ptarmigan share a common optimal clutch size that is largely independent of measured individual states. While we found no clear direct weather effects on clutch size, higher spring temperatures advanced onset of breeding, and early breeding was followed by an increased number of offspring. Warmer springs were positively related to maternal mass, and mass interacted with clutch size in production of hatchlings. Finally, clutch size and timing of reproduction were highly repeatable within individuals, indicating that individual quality guided trade-offs in reproductive effort. Our results demonstrate how climatic forcing and individual heterogeneity in combination influenced life history traits in a resident montane keystone species.
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spelling pubmed-102064782023-05-25 Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies Eriksen, Lasse Frost Ringsby, Thor Harald Pedersen, Hans Chr. Nilsen, Erlend B. R Soc Open Sci Ecology, Conservation and Global Change Biology Optimization of clutch size and timing of reproduction have substantial effects on lifetime reproductive success in vertebrates, and both individual quality and environmental variation may impact life history strategies. We tested hypotheses related to maternal investment and timing of reproduction, using 17 years (1978–1994) of individual-based life history data on willow ptarmigan (Lagopus l. lagopus, n = 290 breeding females with n = 319 breeding attempts) in central Norway. We analysed whether climatic variation and individual state variables (age and body mass) affected the number of offspring and timing of reproduction, and individual repeatability in strategies. The results suggest that willow ptarmigan share a common optimal clutch size that is largely independent of measured individual states. While we found no clear direct weather effects on clutch size, higher spring temperatures advanced onset of breeding, and early breeding was followed by an increased number of offspring. Warmer springs were positively related to maternal mass, and mass interacted with clutch size in production of hatchlings. Finally, clutch size and timing of reproduction were highly repeatable within individuals, indicating that individual quality guided trade-offs in reproductive effort. Our results demonstrate how climatic forcing and individual heterogeneity in combination influenced life history traits in a resident montane keystone species. The Royal Society 2023-05-24 /pmc/articles/PMC10206478/ /pubmed/37234506 http://dx.doi.org/10.1098/rsos.221427 Text en © 2023 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Ecology, Conservation and Global Change Biology
Eriksen, Lasse Frost
Ringsby, Thor Harald
Pedersen, Hans Chr.
Nilsen, Erlend B.
Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title_full Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title_fullStr Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title_full_unstemmed Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title_short Climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
title_sort climatic forcing and individual heterogeneity in a resident mountain bird: legacy data reveal effects on reproductive strategies
topic Ecology, Conservation and Global Change Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10206478/
https://www.ncbi.nlm.nih.gov/pubmed/37234506
http://dx.doi.org/10.1098/rsos.221427
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