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Title: Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors

Abstract

Synopsis Developmental conditions can have consequences for offspring fitness. For example, small changes (<1°C) in average avian incubation temperature have large effects on important post-hatch offspring phenotypes, including growth rate, thermoregulation, and behavior. Furthermore, average incubation temperatures differ among eggs within the same nest, to the extent (i.e., >1°C) that differences in offspring phenotypes within broods should result. A potential consequence of within-nest incubation temperature variation is inequality in behaviors that could cause differences in resource acquisition within broods. To investigate this, we incubated wood duck (Aix sponsa) eggs at one of two ecologically-relevant incubation temperatures (35°C or 36°C), formed mixed-incubation temperature broods after ducklings hatched, and conducted trials to measure duckling behaviors associated with acquisition of heat (one trial) or food (three trials). Contrary to our predictions, we found no effect of incubation temperature on duckling behaviors (e.g., time spent occupying heat source, frequency of feeding bouts). However, we found evidence that ducklings incubated at the higher temperature consumed more food during the 1-h feeding trials, and grew faster in body mass and structural size (culmen and tarsus) throughout the study, than those incubated at the lower temperature. Apparent food consumption during the trials was positively related to culmenmore » length, suggesting that differences in food consumption may be driven by structural size. This could result in positive feedback, which would amplify size differences between offspring incubated at different temperatures. Thus, our study identifies incubation temperature as a mechanism by which fitness-related phenotypic differences can be generated and even amplified within avian broods.« less

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [1]
  1. Department of Fish and Wildlife Conservation, Virginia Tech, Blacksburg, VA, USA
  2. Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1617963
Grant/Contract Number:  
FC09-07SR22506
Resource Type:
Published Article
Journal Name:
Integrative Organismal Biology
Additional Journal Information:
Journal Name: Integrative Organismal Biology Journal Volume: 2 Journal Issue: 1; Journal ID: ISSN 2517-4843
Publisher:
Oxford University Press
Country of Publication:
Country unknown/Code not available
Language:
English

Citation Formats

Hope, S. F., Kennamer, R. A., Grimaudo, A. T., Hallagan, J. J., and Hopkins, W. A. Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors. Country unknown/Code not available: N. p., 2020. Web. doi:10.1093/iob/obaa003.
Hope, S. F., Kennamer, R. A., Grimaudo, A. T., Hallagan, J. J., & Hopkins, W. A. Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors. Country unknown/Code not available. doi:https://doi.org/10.1093/iob/obaa003
Hope, S. F., Kennamer, R. A., Grimaudo, A. T., Hallagan, J. J., and Hopkins, W. A. Wed . "Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors". Country unknown/Code not available. doi:https://doi.org/10.1093/iob/obaa003.
@article{osti_1617963,
title = {Incubation Temperature Affects Duckling Body Size and Food Consumption Despite No Effect on Associated Feeding Behaviors},
author = {Hope, S. F. and Kennamer, R. A. and Grimaudo, A. T. and Hallagan, J. J. and Hopkins, W. A.},
abstractNote = {Synopsis Developmental conditions can have consequences for offspring fitness. For example, small changes (<1°C) in average avian incubation temperature have large effects on important post-hatch offspring phenotypes, including growth rate, thermoregulation, and behavior. Furthermore, average incubation temperatures differ among eggs within the same nest, to the extent (i.e., >1°C) that differences in offspring phenotypes within broods should result. A potential consequence of within-nest incubation temperature variation is inequality in behaviors that could cause differences in resource acquisition within broods. To investigate this, we incubated wood duck (Aix sponsa) eggs at one of two ecologically-relevant incubation temperatures (35°C or 36°C), formed mixed-incubation temperature broods after ducklings hatched, and conducted trials to measure duckling behaviors associated with acquisition of heat (one trial) or food (three trials). Contrary to our predictions, we found no effect of incubation temperature on duckling behaviors (e.g., time spent occupying heat source, frequency of feeding bouts). However, we found evidence that ducklings incubated at the higher temperature consumed more food during the 1-h feeding trials, and grew faster in body mass and structural size (culmen and tarsus) throughout the study, than those incubated at the lower temperature. Apparent food consumption during the trials was positively related to culmen length, suggesting that differences in food consumption may be driven by structural size. This could result in positive feedback, which would amplify size differences between offspring incubated at different temperatures. Thus, our study identifies incubation temperature as a mechanism by which fitness-related phenotypic differences can be generated and even amplified within avian broods.},
doi = {10.1093/iob/obaa003},
journal = {Integrative Organismal Biology},
number = 1,
volume = 2,
place = {Country unknown/Code not available},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
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DOI: https://doi.org/10.1093/iob/obaa003

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