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High temperature intensifies negative density dependence of fitness in red flour beetles
Competition for food, space, or other depletable resources has strong impacts on the fitness of organisms and can lead to a pattern known as negative density dependence, where fitness decreases as population density increases. Yet, many resources that have strong impacts on fitness are nondepletable...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BlackWell Publishing Ltd
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4364820/ https://www.ncbi.nlm.nih.gov/pubmed/25798223 http://dx.doi.org/10.1002/ece3.1402 |
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author | Halliday, William D Thomas, Alison S Blouin-Demers, Gabriel |
author_facet | Halliday, William D Thomas, Alison S Blouin-Demers, Gabriel |
author_sort | Halliday, William D |
collection | PubMed |
description | Competition for food, space, or other depletable resources has strong impacts on the fitness of organisms and can lead to a pattern known as negative density dependence, where fitness decreases as population density increases. Yet, many resources that have strong impacts on fitness are nondepletable (e.g., moisture or temperature). How do these nondepletable resources interact with depletable resources to modify negative density dependence? We tested the hypothesis that negative density dependence is modulated by temperature in red flour beetles and tested the prediction that the strength of negative density dependence should decrease as temperature decreases. We measured the number of eggs laid, offspring development time, and the number of offspring that reached maturity at three temperatures and two food treatment combinations as we simultaneously manipulated adult population density. We demonstrated that low temperatures weaken negative density dependence in the number of eggs laid; this pattern was most evident when food was abundant. Density had no effect on development time, but low temperatures increased development time. The percent of eggs that emerged as adults decreased with both density and temperature and increased with food. Temperature, an abiotic driver, can thus modulate density-dependent processes in ectotherms. Therefore, models of population growth for ectotherms should incorporate the effects of temperature. |
format | Online Article Text |
id | pubmed-4364820 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | BlackWell Publishing Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-43648202015-03-20 High temperature intensifies negative density dependence of fitness in red flour beetles Halliday, William D Thomas, Alison S Blouin-Demers, Gabriel Ecol Evol Short Communication Competition for food, space, or other depletable resources has strong impacts on the fitness of organisms and can lead to a pattern known as negative density dependence, where fitness decreases as population density increases. Yet, many resources that have strong impacts on fitness are nondepletable (e.g., moisture or temperature). How do these nondepletable resources interact with depletable resources to modify negative density dependence? We tested the hypothesis that negative density dependence is modulated by temperature in red flour beetles and tested the prediction that the strength of negative density dependence should decrease as temperature decreases. We measured the number of eggs laid, offspring development time, and the number of offspring that reached maturity at three temperatures and two food treatment combinations as we simultaneously manipulated adult population density. We demonstrated that low temperatures weaken negative density dependence in the number of eggs laid; this pattern was most evident when food was abundant. Density had no effect on development time, but low temperatures increased development time. The percent of eggs that emerged as adults decreased with both density and temperature and increased with food. Temperature, an abiotic driver, can thus modulate density-dependent processes in ectotherms. Therefore, models of population growth for ectotherms should incorporate the effects of temperature. BlackWell Publishing Ltd 2015-03 2015-02-08 /pmc/articles/PMC4364820/ /pubmed/25798223 http://dx.doi.org/10.1002/ece3.1402 Text en © 2015 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/4.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Short Communication Halliday, William D Thomas, Alison S Blouin-Demers, Gabriel High temperature intensifies negative density dependence of fitness in red flour beetles |
title | High temperature intensifies negative density dependence of fitness in red flour beetles |
title_full | High temperature intensifies negative density dependence of fitness in red flour beetles |
title_fullStr | High temperature intensifies negative density dependence of fitness in red flour beetles |
title_full_unstemmed | High temperature intensifies negative density dependence of fitness in red flour beetles |
title_short | High temperature intensifies negative density dependence of fitness in red flour beetles |
title_sort | high temperature intensifies negative density dependence of fitness in red flour beetles |
topic | Short Communication |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4364820/ https://www.ncbi.nlm.nih.gov/pubmed/25798223 http://dx.doi.org/10.1002/ece3.1402 |
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