Direction and Progression of Thermal Acclimation Effects on Ciliated Protist Populations Both Depend on Direction of Thermal Change.
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| Title: | Direction and Progression of Thermal Acclimation Effects on Ciliated Protist Populations Both Depend on Direction of Thermal Change. |
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| Authors: | Bebout, Julia1 (AUTHOR) jbebout@ucsd.edu, Fox, Jeremy W.2 (AUTHOR) |
| Source: | Ecology & Evolution (20457758). May2026, Vol. 16 Issue 5, p1-10. 10p. |
| Subject Terms: | *Population dynamics, *Temperature, *Homeostasis, Ciliata, Heat adaptation, Protista, Rate of natural increase |
| Abstract: | Organisms acclimate to environmental temperatures to maintain physiological homeostasis. Acclimation can alter demographic rates, thereby affecting population dynamics. Previous research has demonstrated that acclimation can have positive or negative effects on population growth rates in variable thermal environments, depending on the amount of time acclimation takes. A clear picture of the timescale of acclimation may help identify the consequences of various frequencies of thermal fluctuations for population dynamics. However, the progression of population‐level effects of acclimation over time has not been explored. We used experimental microcosms to test the effects of acclimation on population dynamics of the ciliated protist Colpidium striatum in various thermal regimes. We also observed the progression of these effects over the course of acclimation. Prior acclimation to cooler conditions increased intrinsic growth rates in warm trial conditions relative to the growth rates of warm‐acclimated populations. In contrast, prior acclimation to warm conditions decreased intrinsic growth rates in cool trial conditions relative to the growth rates of cold‐acclimated populations. These results are consistent with an overcompensatory acclimation response and either the "colder is better" or "optimal acclimation temperature" hypothesis, though we cannot distinguish between these two possibilities without an intermediate acclimation temperature treatment. The observed patterns may be due to resource uptake dynamics and/or increased stress at high temperatures with increased exposure duration. The progression of these effects over the course of acclimation also differed in trajectory, and perhaps duration, for populations acclimating to warmer versus cooler conditions. Differences in the effects and progress of thermal acclimation depending on the direction of thermal change suggest that different physiological mechanisms may be driving acclimation to warmer versus cooler conditions. [ABSTRACT FROM AUTHOR] |
| Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| FullText | Text: Availability: 0 |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 194055031 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Direction and Progression of Thermal Acclimation Effects on Ciliated Protist Populations Both Depend on Direction of Thermal Change. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bebout%2C+Julia%22">Bebout, Julia</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jbebout@ucsd.edu</i><br /><searchLink fieldCode="AR" term="%22Fox%2C+Jeremy+W%2E%22">Fox, Jeremy W.</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. May2026, Vol. 16 Issue 5, p1-10. 10p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Population+dynamics%22">Population dynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br />*<searchLink fieldCode="DE" term="%22Homeostasis%22">Homeostasis</searchLink><br /><searchLink fieldCode="DE" term="%22Ciliata%22">Ciliata</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+adaptation%22">Heat adaptation</searchLink><br /><searchLink fieldCode="DE" term="%22Protista%22">Protista</searchLink><br /><searchLink fieldCode="DE" term="%22Rate+of+natural+increase%22">Rate of natural increase</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Organisms acclimate to environmental temperatures to maintain physiological homeostasis. Acclimation can alter demographic rates, thereby affecting population dynamics. Previous research has demonstrated that acclimation can have positive or negative effects on population growth rates in variable thermal environments, depending on the amount of time acclimation takes. A clear picture of the timescale of acclimation may help identify the consequences of various frequencies of thermal fluctuations for population dynamics. However, the progression of population‐level effects of acclimation over time has not been explored. We used experimental microcosms to test the effects of acclimation on population dynamics of the ciliated protist Colpidium striatum in various thermal regimes. We also observed the progression of these effects over the course of acclimation. Prior acclimation to cooler conditions increased intrinsic growth rates in warm trial conditions relative to the growth rates of warm‐acclimated populations. In contrast, prior acclimation to warm conditions decreased intrinsic growth rates in cool trial conditions relative to the growth rates of cold‐acclimated populations. These results are consistent with an overcompensatory acclimation response and either the "colder is better" or "optimal acclimation temperature" hypothesis, though we cannot distinguish between these two possibilities without an intermediate acclimation temperature treatment. The observed patterns may be due to resource uptake dynamics and/or increased stress at high temperatures with increased exposure duration. The progression of these effects over the course of acclimation also differed in trajectory, and perhaps duration, for populations acclimating to warmer versus cooler conditions. Differences in the effects and progress of thermal acclimation depending on the direction of thermal change suggest that different physiological mechanisms may be driving acclimation to warmer versus cooler conditions. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/ece3.73633 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 1 Subjects: – SubjectFull: Population dynamics Type: general – SubjectFull: Temperature Type: general – SubjectFull: Homeostasis Type: general – SubjectFull: Ciliata Type: general – SubjectFull: Heat adaptation Type: general – SubjectFull: Protista Type: general – SubjectFull: Rate of natural increase Type: general Titles: – TitleFull: Direction and Progression of Thermal Acclimation Effects on Ciliated Protist Populations Both Depend on Direction of Thermal Change. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bebout, Julia – PersonEntity: Name: NameFull: Fox, Jeremy W. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 20457758 Numbering: – Type: volume Value: 16 – Type: issue Value: 5 Titles: – TitleFull: Ecology & Evolution (20457758) Type: main |
| ResultId | 1 |
