Independence of brain and body temperatures in flying American kestrels, Falco sparverius

Autor:	M. H. Bernstein, M. B. Curtis, D. M. Hudson
Rok vydání:	1979
Předmět:	Delta Colon Physiology Chemistry Rest Physical Exertion Hypothalamus Brain Brain tissue Body Temperature Birds Animal science Physiology (medical) Air temperature Animals Body Temperature Regulation
Zdroj:	American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 237:R58-R62
ISSN:	1522-1490 0363-6119
Popis:	Brain and body temperatures were measured via small thermocouples implanted in the anterior hypothalami and colons, respectively, of five adult American kestrels (F. sparverius, mean mass 119 g) during descending flights in a wind tunnel at angles of 4 and 6 degrees below horizontal, at 10 m.s-1 air speed, and at 23 degrees C air temperature. For comparison, temperatures were recorded from resting birds at 22.5-36.1 degrees C air temperatures. Colonic (Tc) and hypothalamic (Th) temperatures both increased after the onset of flight; steady-state levels were attained after 1 min in the hypothalamus and after 5 or more min in the colon. The steady-state difference (delta T = Tc - Th) averaged 1.2 degrees C, higher by 0.5 degrees C than delta T in resting kestrels. The establishment of delta T during flight may be correlated with increased respiratory and corneal evaporation. The response apparently confines most stored body heat to noncranial regions, thus protecting brain tissue from thermal extremes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99b39b368a0a20a3e981ca1ee8976065 https://doi.org/10.1152/ajpregu.1979.237.1.r58 Zobrazit plný text záznamu