TY - JOUR
T1 - Metabolic constraints on long-distance migration in birds
AU - Klaassen, M.R.J.
N1 - Reporting year: 1996
Metis note: 2061; CL; PDI ; AnE file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1996/Klaassen_2061.pdf
PY - 1996
Y1 - 1996
N2 - The flight range of migrating birds depends crucially on the amount of fuel stored by the bird prior to migration or taken up en route at stop-over sites. However, an increase in body mass is associated with an increase in energetic costs, counteracting the benefit of fuel stores. Water imbalance, occurring when water loss exceeds metabolic water production, may constitute another less well recognised problem limiting flight range. The main route of water loss during flight is via the lungs; the rate of loss depends on ambient temperature, relative humidity and ventilatory flow and increases with altitude. Metabolite production results in an increased plasma osmolality, also endangering the proper functioning of the organism during flight. Energetic constraints and water-balance problems may interact in determining several aspects of flight behaviour, such as altitude of flight, mode of flight, lap distance and stop-over duration. To circumvent energetic and water-balance problems, a bird could migrate in short hops instead of long leaps if crossing of large ecological barriers can be avoided. However, although necessitating larger fuel stores and being more expensive, migration by long leaps may sometimes be faster than by short hops. Time constraints are also an important factor in explaining why soaring, which conserves energy and water, occurs exclusively in very large species: small birds can soar at low speeds only. Good navigational skills involving accurate orientation and assessment of altitude and air and ground speed assist in avoiding physiological stress during migration. [KEYWORDS: migration; energetics; water balance; fuel stores time minimization; allometric relationships; flight altitude; navigation; birds Catbird dumetella-carolinensis; optimal fat loads; flight-muscle; body-mass; spring migration; water; requirements;adaptations; reserve; storage]
AB - The flight range of migrating birds depends crucially on the amount of fuel stored by the bird prior to migration or taken up en route at stop-over sites. However, an increase in body mass is associated with an increase in energetic costs, counteracting the benefit of fuel stores. Water imbalance, occurring when water loss exceeds metabolic water production, may constitute another less well recognised problem limiting flight range. The main route of water loss during flight is via the lungs; the rate of loss depends on ambient temperature, relative humidity and ventilatory flow and increases with altitude. Metabolite production results in an increased plasma osmolality, also endangering the proper functioning of the organism during flight. Energetic constraints and water-balance problems may interact in determining several aspects of flight behaviour, such as altitude of flight, mode of flight, lap distance and stop-over duration. To circumvent energetic and water-balance problems, a bird could migrate in short hops instead of long leaps if crossing of large ecological barriers can be avoided. However, although necessitating larger fuel stores and being more expensive, migration by long leaps may sometimes be faster than by short hops. Time constraints are also an important factor in explaining why soaring, which conserves energy and water, occurs exclusively in very large species: small birds can soar at low speeds only. Good navigational skills involving accurate orientation and assessment of altitude and air and ground speed assist in avoiding physiological stress during migration. [KEYWORDS: migration; energetics; water balance; fuel stores time minimization; allometric relationships; flight altitude; navigation; birds Catbird dumetella-carolinensis; optimal fat loads; flight-muscle; body-mass; spring migration; water; requirements;adaptations; reserve; storage]
M3 - Article
SN - 0022-0949
VL - 199
SP - 57
EP - 64
JO - Journal of Experimental Biology
JF - Journal of Experimental Biology
IS - 1
ER -