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Titolo:
Respiratory water loss in free-flying pigeons
Autore:
Michaeli, G; Pinshow, B;
Indirizzi:
Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, IL-84990 MidreshetBen Gurion, Israel Ben Gurion Univ Negev Midreshet Ben Gurion Israel IL-84990 urion, Israel Ben Gurion Univ Negev, Dept Life Sci, IL-84990 Midreshet Ben Gurion, Israel Ben Gurion Univ Negev Midreshet Ben Gurion Israel IL-84990 urion, Israel
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 21, volume: 204, anno: 2001,
pagine: 3803 - 3814
SICI:
0022-0949(200111)204:21<3803:RWLIFP>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAT-STRESSED BIRDS; HOMING PIGEONS; WIND-TUNNEL; TEMPERATURE REGULATION; OXYGEN-CONSUMPTION; FLIGHT; BALANCE; PARAMETERS; ENERGETICS; RESPONSES;
Keywords:
pigeon; Columbia levia; respiratory water loss; evaporative water loss; cutaneous water loss; respiratory air temperature; exhaled air temperature; breathing frequency;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Pinshow, B Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, IL-84990 MidreshetBen Gurion, Israel Ben Gurion Univ Negev Midreshet Ben Gurion Israel IL-84990 el
Citazione:
G. Michaeli e B. Pinshow, "Respiratory water loss in free-flying pigeons", J EXP BIOL, 204(21), 2001, pp. 3803-3814

Abstract

We assessed respiratory and cutaneous water loss in trained tippler pigeons (Columba livia) both at rest and in free flight. In resting pigeons, exhaled air temperature T-ex increased with ambient air temperature T-a (T-ex=16.3+0.705T(a)) between 15 degreesC and 30 degreesC, while tidal volume V-T (V-T=4.7 +/-1.0mI, mean +/- S.D. at standard temperature and pressure dry) and breathing frequency f(R) (f(R)=0.46 +/-0.06 breaths s(-1)) were independent of T-a. Respiratory water loss, RWL, was constant over the range of T-a (RWL=1.2 +/-0.4 mg g(-1) h(-1)) used. In flying pigeons, T-ex increased with T-a (T-ex=25.8+0.34T(a)), while f(R) was independent of T-a (f(R)=5.6 +/-1.4 breaths s(-1)) between 8.8 degreesC and 27 degreesC. Breathing frequency varied intermittently between 2 and 8 breaths s(-1) during flight and was not always synchronized with wing-beat frequency. RWL was independent ofair temperature (RWL=9.2 +/-2.9 mg g(-1) h(-1)), but decreased with increasing inspired air water vapor density (rho in) (RWL=12.5-0.362 rho in), whereas cutaneous water loss, CWL, increased with air temperature (CWL=10.122+0.898T(a)), but was independent of rho in. RWL was 25.7-32.2 %, while CWL was 67.8-74.3 % of the total evaporative water loss. The data indicate that pigeons have more efficient countercurrent. heat exchange in their anteriorrespiratory passages when at rest than in flight, allowing them to recovermore water at rest at lower air temperatures. When evaporative water loss increases in flight, especially at high T-a, the major component is cutaneous rather than respiratory, possibly brought about by reducing the skin water vapor diffusion resistance. Because of the tight restrictions imposed bygas exchange in flight, the amount of water potentially lost through respiration is limited.

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Documento generato il 24/09/20 alle ore 08:07:00