Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?

Abstract Insectivorous birds breeding in seasonal environments provision their dependent young during periods when prey diversity and abundance vary. Consequently, the composition and nutritional value of diets parents feed to their offspring may differ within and among broods, potentially affecting...

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Autores principales:	Aija F. White, Russell D. Dawson
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	avian insectivore diet composition nestling condition nutrition stable isotope mixing models Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/b7e1c48c9b1649ed8e1dc71da4e9bfbb
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spelling	oai:doaj.org-article:b7e1c48c9b1649ed8e1dc71da4e9bfbb2021-11-08T17:10:41ZCan diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?2045-775810.1002/ece3.8210https://doaj.org/article/b7e1c48c9b1649ed8e1dc71da4e9bfbb2021-11-01T00:00:00Zhttps://doi.org/10.1002/ece3.8210https://doaj.org/toc/2045-7758Abstract Insectivorous birds breeding in seasonal environments provision their dependent young during periods when prey diversity and abundance vary. Consequently, the composition and nutritional value of diets parents feed to their offspring may differ within and among broods, potentially affecting the condition of nestlings. In a population of mountain bluebirds (Sialia currucoides), we used two methods to estimate diet composition for individual nestlings: direct observation of provisioning using video recordings at 5 and 9 days post‐hatch, and stable isotopes of the δ13C and δ15N in nestling feathers and prey followed by analysis with mixing models. We determined the macronutrient content (% fat and lean mass) and estimated the metabolized energy from each type of prey. We evaluated whether different methods of estimating diet composition would produce similar results, and whether the types of prey nestlings ate at one or both ages affected their morphology, growth rates, or blood ketone concentration. We found that bluebirds fed their young 5 main types of prey: beetles, cicadas, grasshoppers, insect larvae, and spiders. Both observational and mixing model estimates of diet composition indicated that larvae are traded off with grasshoppers and that fewer larvae are provided to nestlings as the season progresses. In evaluating how diet influences individual growth and condition, estimates from direct observations had greater explanatory power than those from mixing models, indicating that diets rich in the most energy‐dense prey (greatest fat content; cicadas and larvae) were associated with larger size and higher body condition, and faster rate of mass gain and growth of tarsus. Lower value prey had more limited, specific effects on nestlings, but may still be important dietary components. While isotopic methods produced estimates of diet composition that were generally informative, when applied to explain the growth and condition of nestlings they proved less useful.Aija F. WhiteRussell D. DawsonWileyarticleavian insectivorediet compositionnestling conditionnutritionstable isotope mixing modelsEcologyQH540-549.5ENEcology and Evolution, Vol 11, Iss 21, Pp 15273-15288 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	avian insectivore diet composition nestling condition nutrition stable isotope mixing models Ecology QH540-549.5
spellingShingle	avian insectivore diet composition nestling condition nutrition stable isotope mixing models Ecology QH540-549.5 Aija F. White Russell D. Dawson Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
description	Abstract Insectivorous birds breeding in seasonal environments provision their dependent young during periods when prey diversity and abundance vary. Consequently, the composition and nutritional value of diets parents feed to their offspring may differ within and among broods, potentially affecting the condition of nestlings. In a population of mountain bluebirds (Sialia currucoides), we used two methods to estimate diet composition for individual nestlings: direct observation of provisioning using video recordings at 5 and 9 days post‐hatch, and stable isotopes of the δ13C and δ15N in nestling feathers and prey followed by analysis with mixing models. We determined the macronutrient content (% fat and lean mass) and estimated the metabolized energy from each type of prey. We evaluated whether different methods of estimating diet composition would produce similar results, and whether the types of prey nestlings ate at one or both ages affected their morphology, growth rates, or blood ketone concentration. We found that bluebirds fed their young 5 main types of prey: beetles, cicadas, grasshoppers, insect larvae, and spiders. Both observational and mixing model estimates of diet composition indicated that larvae are traded off with grasshoppers and that fewer larvae are provided to nestlings as the season progresses. In evaluating how diet influences individual growth and condition, estimates from direct observations had greater explanatory power than those from mixing models, indicating that diets rich in the most energy‐dense prey (greatest fat content; cicadas and larvae) were associated with larger size and higher body condition, and faster rate of mass gain and growth of tarsus. Lower value prey had more limited, specific effects on nestlings, but may still be important dietary components. While isotopic methods produced estimates of diet composition that were generally informative, when applied to explain the growth and condition of nestlings they proved less useful.
format	article
author	Aija F. White Russell D. Dawson
author_facet	Aija F. White Russell D. Dawson
author_sort	Aija F. White
title	Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
title_short	Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
title_full	Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
title_fullStr	Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
title_full_unstemmed	Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?
title_sort	can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (sialia currucoides)?
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/b7e1c48c9b1649ed8e1dc71da4e9bfbb
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Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)?

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