Fluctuating temperatures extend median lifespan, improve
reproduction and reduce growth in turquoise killifish

J 2020

Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish

ŽÁK, Jakub and Martin REICHARD

Basic information

Original name

Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish

Authors

ŽÁK, Jakub (203 Czech Republic) and Martin REICHARD (203 Czech Republic, guarantor, belonging to the institution)

Edition

EXPERIMENTAL GERONTOLOGY, OXFORD, PERGAMON-ELSEVIER SCIENCE LTD, 2020, 0531-5565

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10600 1.6 Biological sciences

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

URL

Impact factor

Impact factor: 4.032

RIV identification code

RIV/00216224:14310/20:00117484

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.exger.2020.111073

UT WoS

000569147700008

Keywords in English

Aging; Environmental stress; Life histories; Nothobranchius furzeri; Thermal regime; Vertebrate lifespan

Abstract

V originále

In natural populations, individuals experience daily fluctuations in environmental conditions that synchronise endogenous biorhythms. Artificial alterations of environmental fluctuations can have negative consequences for life history traits, including lifespan. In laboratory studies of aging, the role of fluctuating temperature is usually overlooked and we know little of how thermal fluctuation modulates senescence in vertebrates. In this longitudinal study we followed individually-housed turquoise killifish, Nothobranchius furzeri, from two thermal regimes; ecologically relevant diel fluctuations (20 degrees C - 35 degrees C) and stable temperature (27.5 degrees C), and compared their survival, growth and reproduction. Fish experiencing fluctuating temperatures had a longer median lifespan but reached smaller asymptotic body size. Within-treatment variation indicated that extended lifespan in fluctuating temperatures was not causally linked to decreased growth rate or smaller body size, but occurred solely due to the effect of thermal fluctuations. Male body size was positively associated with lifespan in stable temperatures but this relationship was disrupted in fluctuating thermal regimes. Females exposed to fluctuating temperatures effectively compensated egg production for their smaller size. Thus, there was no difference in absolute fecundity between thermal regimes and body-size corrected fecundity was higher in females in fluctuating temperatures. Overall, despite a brief exposure to sub-optimal thermal conditions during fluctuations, fluctuating temperature had a positive effect on survival and reproduction. These results suggest that the expression of life history traits and their associations under stable temperatures are a poor representation of the relationships obtained from ecologically relevant thermal fluctuations.

Citovat

ŽÁK, Jakub and Martin REICHARD. Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish. EXPERIMENTAL GERONTOLOGY. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2020, vol. 140, OCT, p. "111073", 8 pp. ISSN 0531-5565. Available from: https://dx.doi.org/10.1016/j.exger.2020.111073.

@article{1714176,
   author = {Žák, Jakub and Reichard, Martin},
   article_location = {OXFORD},
   article_number = {OCT},
   doi = {http://dx.doi.org/10.1016/j.exger.2020.111073},
   keywords = {Aging; Environmental stress; Life histories; Nothobranchius furzeri; Thermal regime; Vertebrate lifespan},
   language = {eng},
   issn = {0531-5565},
   journal = {EXPERIMENTAL GERONTOLOGY},
   title = {Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish},
   url = {https://doi.org/10.1016/j.exger.2020.111073},
   volume = {140},
   year = {2020}
}

TY  - JOUR
ID  - 1714176
AU  - Žák, Jakub - Reichard, Martin
PY  - 2020
TI  - Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish
JF  - EXPERIMENTAL GERONTOLOGY
VL  - 140
IS  - OCT
SP  - "111073"
EP  - "111073"
PB  - PERGAMON-ELSEVIER SCIENCE LTD
SN  - 05315565
KW  - Aging
KW  - Environmental stress
KW  - Life histories
KW  - Nothobranchius furzeri
KW  - Thermal regime
KW  - Vertebrate lifespan
UR  - https://doi.org/10.1016/j.exger.2020.111073
L2  - https://doi.org/10.1016/j.exger.2020.111073
N2  - In natural populations, individuals experience daily fluctuations in environmental conditions that synchronise endogenous biorhythms. Artificial alterations of environmental fluctuations can have negative consequences for life history traits, including lifespan. In laboratory studies of aging, the role of fluctuating temperature is usually overlooked and we know little of how thermal fluctuation modulates senescence in vertebrates. In this longitudinal study we followed individually-housed turquoise killifish, Nothobranchius furzeri, from two thermal regimes; ecologically relevant diel fluctuations (20 degrees C - 35 degrees C) and stable temperature (27.5 degrees C), and compared their survival, growth and reproduction. Fish experiencing fluctuating temperatures had a longer median lifespan but reached smaller asymptotic body size. Within-treatment variation indicated that extended lifespan in fluctuating temperatures was not causally linked to decreased growth rate or smaller body size, but occurred solely due to the effect of thermal fluctuations. Male body size was positively associated with lifespan in stable temperatures but this relationship was disrupted in fluctuating thermal regimes. Females exposed to fluctuating temperatures effectively compensated egg production for their smaller size. Thus, there was no difference in absolute fecundity between thermal regimes and body-size corrected fecundity was higher in females in fluctuating temperatures. Overall, despite a brief exposure to sub-optimal thermal conditions during fluctuations, fluctuating temperature had a positive effect on survival and reproduction. These results suggest that the expression of life history traits and their associations under stable temperatures are a poor representation of the relationships obtained from ecologically relevant thermal fluctuations.
ER  -

ŽÁK, Jakub and Martin REICHARD. Fluctuating temperatures extend median lifespan, improve reproduction and reduce growth in turquoise killifish. \textit{EXPERIMENTAL GERONTOLOGY}. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2020, vol.~140, OCT, p.~''111073'', 8 pp. ISSN~0531-5565. Available from: https://dx.doi.org/10.1016/j.exger.2020.111073.

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