Oxygen supply did not affect how lizards responded to thermal stress

Agustín Camacho, John M. Vandenbrooks, Angela Riley, Rory S. Telemeco, Michael Angilletta

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate change. These models predict that species will need to disperse to higher altitudes to persist in a warmer world. However, thermal stress and, thus, thermoregulatory behavior may depend on atmospheric oxygen as well as environmental temperatures. Severe hypoxia causes animals to prefer lower body temperatures, which could be interpreted as evidence that oxygen supply limits heat tolerance. Such a constraint could prevent animals from successfully dispersing to high elevations during climate change. Still, an effect of oxygen supply on preferred body temperature has only been observed when oxygen concentrations fall far below levels experienced in nature. To see whether animals perceive greater thermal stress at an ecologically relevant level of hypoxia, we studied the thermoregulatory behavior of lizards (Sceloporus tristichus) exposed to oxygen concentrations of 13% and 21% (equivalent to PO2 at 4000 m and 0 m, respectively). In addition, we exposed lizards to 29% oxygen to see whether they would accept a higher body temperature at hyperoxia than at normoxia. At each oxygen level, we measured a behavioral response to heat stress known as the voluntary thermal maximum: the temperature at which a warming animal sought a cool refuge. Oxygen concentration had no discernable effect on the voluntary thermal maximum, suggesting that lizards experience thermal stress similarly at all 3 levels of oxygen (13%, 12% and 29%). Future research should focus on thermoregulatory behaviors under ecologically relevant levels of hypoxia.

Original languageEnglish (US)
Pages (from-to)428-436
Number of pages9
JournalIntegrative Zoology
Volume13
Issue number4
DOIs
StatePublished - Jul 1 2018

Fingerprint

thermal stress
lizards
oxygen
body temperature
hypoxia
animals
climate change
zoologists
hyperoxia
Sceloporus
heat
normoxia
thermoregulation
heat tolerance
heat stress
ambient temperature
niches

Keywords

  • hypoxia
  • Sceloporus
  • stress
  • temperature
  • thermoregulation

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Oxygen supply did not affect how lizards responded to thermal stress. / Camacho, Agustín; Vandenbrooks, John M.; Riley, Angela; Telemeco, Rory S.; Angilletta, Michael.

In: Integrative Zoology, Vol. 13, No. 4, 01.07.2018, p. 428-436.

Research output: Contribution to journalArticle

Camacho, Agustín ; Vandenbrooks, John M. ; Riley, Angela ; Telemeco, Rory S. ; Angilletta, Michael. / Oxygen supply did not affect how lizards responded to thermal stress. In: Integrative Zoology. 2018 ; Vol. 13, No. 4. pp. 428-436.
@article{2697c9be81c441e8881bf10cc8d503b7,
title = "Oxygen supply did not affect how lizards responded to thermal stress",
abstract = "Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate change. These models predict that species will need to disperse to higher altitudes to persist in a warmer world. However, thermal stress and, thus, thermoregulatory behavior may depend on atmospheric oxygen as well as environmental temperatures. Severe hypoxia causes animals to prefer lower body temperatures, which could be interpreted as evidence that oxygen supply limits heat tolerance. Such a constraint could prevent animals from successfully dispersing to high elevations during climate change. Still, an effect of oxygen supply on preferred body temperature has only been observed when oxygen concentrations fall far below levels experienced in nature. To see whether animals perceive greater thermal stress at an ecologically relevant level of hypoxia, we studied the thermoregulatory behavior of lizards (Sceloporus tristichus) exposed to oxygen concentrations of 13{\%} and 21{\%} (equivalent to PO2 at 4000 m and 0 m, respectively). In addition, we exposed lizards to 29{\%} oxygen to see whether they would accept a higher body temperature at hyperoxia than at normoxia. At each oxygen level, we measured a behavioral response to heat stress known as the voluntary thermal maximum: the temperature at which a warming animal sought a cool refuge. Oxygen concentration had no discernable effect on the voluntary thermal maximum, suggesting that lizards experience thermal stress similarly at all 3 levels of oxygen (13{\%}, 12{\%} and 29{\%}). Future research should focus on thermoregulatory behaviors under ecologically relevant levels of hypoxia.",
keywords = "hypoxia, Sceloporus, stress, temperature, thermoregulation",
author = "Agust{\'i}n Camacho and Vandenbrooks, {John M.} and Angela Riley and Telemeco, {Rory S.} and Michael Angilletta",
year = "2018",
month = "7",
day = "1",
doi = "10.1111/1749-4877.12310",
language = "English (US)",
volume = "13",
pages = "428--436",
journal = "Integrative Zoology",
issn = "1749-4877",
publisher = "Wiley-Blackwell",
number = "4",

}

TY - JOUR

T1 - Oxygen supply did not affect how lizards responded to thermal stress

AU - Camacho, Agustín

AU - Vandenbrooks, John M.

AU - Riley, Angela

AU - Telemeco, Rory S.

AU - Angilletta, Michael

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate change. These models predict that species will need to disperse to higher altitudes to persist in a warmer world. However, thermal stress and, thus, thermoregulatory behavior may depend on atmospheric oxygen as well as environmental temperatures. Severe hypoxia causes animals to prefer lower body temperatures, which could be interpreted as evidence that oxygen supply limits heat tolerance. Such a constraint could prevent animals from successfully dispersing to high elevations during climate change. Still, an effect of oxygen supply on preferred body temperature has only been observed when oxygen concentrations fall far below levels experienced in nature. To see whether animals perceive greater thermal stress at an ecologically relevant level of hypoxia, we studied the thermoregulatory behavior of lizards (Sceloporus tristichus) exposed to oxygen concentrations of 13% and 21% (equivalent to PO2 at 4000 m and 0 m, respectively). In addition, we exposed lizards to 29% oxygen to see whether they would accept a higher body temperature at hyperoxia than at normoxia. At each oxygen level, we measured a behavioral response to heat stress known as the voluntary thermal maximum: the temperature at which a warming animal sought a cool refuge. Oxygen concentration had no discernable effect on the voluntary thermal maximum, suggesting that lizards experience thermal stress similarly at all 3 levels of oxygen (13%, 12% and 29%). Future research should focus on thermoregulatory behaviors under ecologically relevant levels of hypoxia.

AB - Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate change. These models predict that species will need to disperse to higher altitudes to persist in a warmer world. However, thermal stress and, thus, thermoregulatory behavior may depend on atmospheric oxygen as well as environmental temperatures. Severe hypoxia causes animals to prefer lower body temperatures, which could be interpreted as evidence that oxygen supply limits heat tolerance. Such a constraint could prevent animals from successfully dispersing to high elevations during climate change. Still, an effect of oxygen supply on preferred body temperature has only been observed when oxygen concentrations fall far below levels experienced in nature. To see whether animals perceive greater thermal stress at an ecologically relevant level of hypoxia, we studied the thermoregulatory behavior of lizards (Sceloporus tristichus) exposed to oxygen concentrations of 13% and 21% (equivalent to PO2 at 4000 m and 0 m, respectively). In addition, we exposed lizards to 29% oxygen to see whether they would accept a higher body temperature at hyperoxia than at normoxia. At each oxygen level, we measured a behavioral response to heat stress known as the voluntary thermal maximum: the temperature at which a warming animal sought a cool refuge. Oxygen concentration had no discernable effect on the voluntary thermal maximum, suggesting that lizards experience thermal stress similarly at all 3 levels of oxygen (13%, 12% and 29%). Future research should focus on thermoregulatory behaviors under ecologically relevant levels of hypoxia.

KW - hypoxia

KW - Sceloporus

KW - stress

KW - temperature

KW - thermoregulation

UR - http://www.scopus.com/inward/record.url?scp=85050555164&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85050555164&partnerID=8YFLogxK

U2 - 10.1111/1749-4877.12310

DO - 10.1111/1749-4877.12310

M3 - Article

VL - 13

SP - 428

EP - 436

JO - Integrative Zoology

JF - Integrative Zoology

SN - 1749-4877

IS - 4

ER -