Seasonality and seasons out of time - The thermoregulatory effects of light interference

Abraham Haim; Uri Shanas; Abed El Salam Zubidad; Michael Scantelbury

doi:10.1081/CBI-200038144

Seasonality and seasons out of time - The thermoregulatory effects of light interference

Abraham Haim, Uri Shanas, Abed El Salam Zubidad, Michael Scantelbury

Department of Natural Resources and Environmental Management

Research output: Contribution to journal › Article › peer-review

Abstract

The change in photoperiod is the main environmental cue for seasonal function of the reproductive, thermoregulatory, and immune systems in rodents existing outside of the tropics. In Israel, the social vole Microtus socialis breeds mainly under short photoperiod (SP) conditions. Previous studies showed that exposing voles to light interference (LI) in the field during the winter resulted in death. The aim of the current study was to determine the thermoregulatory response of SP-acclimated voles to LI. Therefore, heat production (VO₂) at different ambient temperatures (T_a) and nonshivering thermogenesis (NST) were measured. Results show that LI of 15 min every 4 h during the dark period significantly (p < 0.02) decreased VO₂ at T_a = 15°C and significantly (p < 0.05) decreased NST-capacity. These results can at least partly explain why LI-voles died during the winter under field conditions, through eliminating winter acclimatization of the thermoregulatory system, or what is considered as "seasons out of time."

Original language	English
Pages (from-to)	59-66
Number of pages	8
Journal	Chronobiology International
Volume	22
Issue number	1
DOIs	https://doi.org/10.1081/CBI-200038144
State	Published - 2005

Keywords

Heat Production
Non-shivering Thermogenesis
Photophase
Seasonality
Thermal Conductance
Thermoregulations
Voles

ASJC Scopus subject areas

Physiology
Physiology (medical)

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1081/CBI-200038144

Cite this

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title = "Seasonality and seasons out of time - The thermoregulatory effects of light interference",

abstract = "The change in photoperiod is the main environmental cue for seasonal function of the reproductive, thermoregulatory, and immune systems in rodents existing outside of the tropics. In Israel, the social vole Microtus socialis breeds mainly under short photoperiod (SP) conditions. Previous studies showed that exposing voles to light interference (LI) in the field during the winter resulted in death. The aim of the current study was to determine the thermoregulatory response of SP-acclimated voles to LI. Therefore, heat production (VO2) at different ambient temperatures (Ta) and nonshivering thermogenesis (NST) were measured. Results show that LI of 15 min every 4 h during the dark period significantly (p < 0.02) decreased VO2 at Ta = 15°C and significantly (p < 0.05) decreased NST-capacity. These results can at least partly explain why LI-voles died during the winter under field conditions, through eliminating winter acclimatization of the thermoregulatory system, or what is considered as {"}seasons out of time.{"}",

keywords = "Heat Production, Non-shivering Thermogenesis, Photophase, Seasonality, Thermal Conductance, Thermoregulations, Voles",

author = "Abraham Haim and Uri Shanas and Zubidad, {Abed El Salam} and Michael Scantelbury",

year = "2005",

doi = "10.1081/CBI-200038144",

language = "English",

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AU - Haim, Abraham

AU - Shanas, Uri

AU - Zubidad, Abed El Salam

AU - Scantelbury, Michael

PY - 2005

Y1 - 2005

N2 - The change in photoperiod is the main environmental cue for seasonal function of the reproductive, thermoregulatory, and immune systems in rodents existing outside of the tropics. In Israel, the social vole Microtus socialis breeds mainly under short photoperiod (SP) conditions. Previous studies showed that exposing voles to light interference (LI) in the field during the winter resulted in death. The aim of the current study was to determine the thermoregulatory response of SP-acclimated voles to LI. Therefore, heat production (VO2) at different ambient temperatures (Ta) and nonshivering thermogenesis (NST) were measured. Results show that LI of 15 min every 4 h during the dark period significantly (p < 0.02) decreased VO2 at Ta = 15°C and significantly (p < 0.05) decreased NST-capacity. These results can at least partly explain why LI-voles died during the winter under field conditions, through eliminating winter acclimatization of the thermoregulatory system, or what is considered as "seasons out of time."

AB - The change in photoperiod is the main environmental cue for seasonal function of the reproductive, thermoregulatory, and immune systems in rodents existing outside of the tropics. In Israel, the social vole Microtus socialis breeds mainly under short photoperiod (SP) conditions. Previous studies showed that exposing voles to light interference (LI) in the field during the winter resulted in death. The aim of the current study was to determine the thermoregulatory response of SP-acclimated voles to LI. Therefore, heat production (VO2) at different ambient temperatures (Ta) and nonshivering thermogenesis (NST) were measured. Results show that LI of 15 min every 4 h during the dark period significantly (p < 0.02) decreased VO2 at Ta = 15°C and significantly (p < 0.05) decreased NST-capacity. These results can at least partly explain why LI-voles died during the winter under field conditions, through eliminating winter acclimatization of the thermoregulatory system, or what is considered as "seasons out of time."

KW - Heat Production

KW - Non-shivering Thermogenesis

KW - Photophase

KW - Seasonality

KW - Thermal Conductance

KW - Thermoregulations

KW - Voles

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SN - 0742-0528

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ER -

Seasonality and seasons out of time - The thermoregulatory effects of light interference

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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