Seasonal variations in the behavioural thermoregulation of roosting Humboldt penguins (Spheniscus humboldti) in north-central Chile

Alejandro Simeone, Guillermo Luna-Jorquera, Rory P. Wilson

Resultado de la investigación: Article

11 Citas (Scopus)

Resumen

We examined the thermoregulatory behaviour (TRB) of roosting Humboldt penguins (Spheniscus humboldti) in north central Chile during summer and winter, when ambient temperatures (Ta) are most extreme. Each body posture was considered to represent a particular TRB, which was ranked in a sequence that reflected different degrees of thermal load and was assigned an arbitrary thermoregulatory score. During summer, birds exhibited eight different TRBs, mainly oriented to heat dissipation, and experienced a wide range of Ta (from 14 to 31°C), occasionally above their thermoneutral zone (TNZ, from 2 to 30°C), this being evident by observations of extreme thermoregulatory responses such as panting. In winter, birds exhibited only three TRBs, mainly oriented to heat retention, and experienced a smaller range of Ta (from 11 to 18°C), always within the TNZ, even at night. The components of behavioural responses increased directly with the heat load which explains the broader behavioural repertoire observed in summer. Since penguins are primarily adapted in morphology and physiology to cope with low water temperatures, our results suggest that behavioural thermoregulation may be important in the maintenance of the thermal balance in Humboldt penguins while on land.

Idioma originalEnglish
Páginas (desde-hasta)35-40
Número de páginas6
PublicaciónJournal of Ornithology
Volumen145
N.º1
DOI
EstadoPublished - 1 ene 2004

Huella dactilar

Spheniscus
penguins
thermoregulation
Chile
seasonal variation
heat
summer
winter
birds
posture
breathing
ambient temperature
temperature
water temperature
physiology

ASJC Scopus subject areas

  • Animal Science and Zoology

Citar esto

@article{ce3d7d47deb94b0ebf4107cc49cd3291,
title = "Seasonal variations in the behavioural thermoregulation of roosting Humboldt penguins (Spheniscus humboldti) in north-central Chile",
abstract = "We examined the thermoregulatory behaviour (TRB) of roosting Humboldt penguins (Spheniscus humboldti) in north central Chile during summer and winter, when ambient temperatures (Ta) are most extreme. Each body posture was considered to represent a particular TRB, which was ranked in a sequence that reflected different degrees of thermal load and was assigned an arbitrary thermoregulatory score. During summer, birds exhibited eight different TRBs, mainly oriented to heat dissipation, and experienced a wide range of Ta (from 14 to 31°C), occasionally above their thermoneutral zone (TNZ, from 2 to 30°C), this being evident by observations of extreme thermoregulatory responses such as panting. In winter, birds exhibited only three TRBs, mainly oriented to heat retention, and experienced a smaller range of Ta (from 11 to 18°C), always within the TNZ, even at night. The components of behavioural responses increased directly with the heat load which explains the broader behavioural repertoire observed in summer. Since penguins are primarily adapted in morphology and physiology to cope with low water temperatures, our results suggest that behavioural thermoregulation may be important in the maintenance of the thermal balance in Humboldt penguins while on land.",
keywords = "Behavioural thermoregulation, Humboldt Penguin, Seasonal changes, Spheniscus humboldt, Thermoneutral zone",
author = "Alejandro Simeone and Guillermo Luna-Jorquera and Wilson, {Rory P.}",
year = "2004",
month = "1",
day = "1",
doi = "10.1007/s10336-003-0005-6",
language = "English",
volume = "145",
pages = "35--40",
journal = "Journal fur Ornithologie",
issn = "2193-7206",
publisher = "Springer Nature",
number = "1",

}

Seasonal variations in the behavioural thermoregulation of roosting Humboldt penguins (Spheniscus humboldti) in north-central Chile. / Simeone, Alejandro; Luna-Jorquera, Guillermo; Wilson, Rory P.

En: Journal of Ornithology, Vol. 145, N.º 1, 01.01.2004, p. 35-40.

Resultado de la investigación: Article

TY - JOUR

T1 - Seasonal variations in the behavioural thermoregulation of roosting Humboldt penguins (Spheniscus humboldti) in north-central Chile

AU - Simeone, Alejandro

AU - Luna-Jorquera, Guillermo

AU - Wilson, Rory P.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - We examined the thermoregulatory behaviour (TRB) of roosting Humboldt penguins (Spheniscus humboldti) in north central Chile during summer and winter, when ambient temperatures (Ta) are most extreme. Each body posture was considered to represent a particular TRB, which was ranked in a sequence that reflected different degrees of thermal load and was assigned an arbitrary thermoregulatory score. During summer, birds exhibited eight different TRBs, mainly oriented to heat dissipation, and experienced a wide range of Ta (from 14 to 31°C), occasionally above their thermoneutral zone (TNZ, from 2 to 30°C), this being evident by observations of extreme thermoregulatory responses such as panting. In winter, birds exhibited only three TRBs, mainly oriented to heat retention, and experienced a smaller range of Ta (from 11 to 18°C), always within the TNZ, even at night. The components of behavioural responses increased directly with the heat load which explains the broader behavioural repertoire observed in summer. Since penguins are primarily adapted in morphology and physiology to cope with low water temperatures, our results suggest that behavioural thermoregulation may be important in the maintenance of the thermal balance in Humboldt penguins while on land.

AB - We examined the thermoregulatory behaviour (TRB) of roosting Humboldt penguins (Spheniscus humboldti) in north central Chile during summer and winter, when ambient temperatures (Ta) are most extreme. Each body posture was considered to represent a particular TRB, which was ranked in a sequence that reflected different degrees of thermal load and was assigned an arbitrary thermoregulatory score. During summer, birds exhibited eight different TRBs, mainly oriented to heat dissipation, and experienced a wide range of Ta (from 14 to 31°C), occasionally above their thermoneutral zone (TNZ, from 2 to 30°C), this being evident by observations of extreme thermoregulatory responses such as panting. In winter, birds exhibited only three TRBs, mainly oriented to heat retention, and experienced a smaller range of Ta (from 11 to 18°C), always within the TNZ, even at night. The components of behavioural responses increased directly with the heat load which explains the broader behavioural repertoire observed in summer. Since penguins are primarily adapted in morphology and physiology to cope with low water temperatures, our results suggest that behavioural thermoregulation may be important in the maintenance of the thermal balance in Humboldt penguins while on land.

KW - Behavioural thermoregulation

KW - Humboldt Penguin

KW - Seasonal changes

KW - Spheniscus humboldt

KW - Thermoneutral zone

UR - http://www.scopus.com/inward/record.url?scp=2142716955&partnerID=8YFLogxK

U2 - 10.1007/s10336-003-0005-6

DO - 10.1007/s10336-003-0005-6

M3 - Article

AN - SCOPUS:2142716955

VL - 145

SP - 35

EP - 40

JO - Journal fur Ornithologie

JF - Journal fur Ornithologie

SN - 2193-7206

IS - 1

ER -