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Wind-dependent foraging flight in the Osprey Pandion haliaetus

Strandberg, Roine LU ; Alerstam, Thomas LU and Hake, M (2006) In Ornis Svecica 16(3). p.150-163
Abstract
We studied the foraging technique of Ospreys Pandion haliaetus during different wind speed conditions at Lake Hammarsjon, Sweden in autumn 2003. Different fishing techniques were used with a shift in relation to wind speed: (1) without hovering, (2) hovering with pure flapping flight, (3) hovering with flapping flight and gliding into the wind, and (4) hovering with pure gliding. The results supported our predictions that hovering is constrained at low wind speeds and gliding restricted to wind speeds exceeding 7 m/s. Mixing flapping and gliding flight when hovering may be done as a trade-off between increased fishing efficiency associated with flapping flight and energy-saving combined with gain in total hovering time associated with... (More)
We studied the foraging technique of Ospreys Pandion haliaetus during different wind speed conditions at Lake Hammarsjon, Sweden in autumn 2003. Different fishing techniques were used with a shift in relation to wind speed: (1) without hovering, (2) hovering with pure flapping flight, (3) hovering with flapping flight and gliding into the wind, and (4) hovering with pure gliding. The results supported our predictions that hovering is constrained at low wind speeds and gliding restricted to wind speeds exceeding 7 m/s. Mixing flapping and gliding flight when hovering may be done as a trade-off between increased fishing efficiency associated with flapping flight and energy-saving combined with gain in total hovering time associated with gliding intervals. The relationship between hovering time and wind speed differed significantly between males and females. At wind speeds up to about 3.0 m/s, the hovering time increased more steeply with increasing wind speed for males than for females. In contrast, hovering time was shorter for males than for females at high wind speeds. The juveniles showed a lower mean, smaller scatter, and less increase in hovering time along the wind speed gradient. (Less)
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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Ornis Svecica
volume
16
issue
3
pages
150 - 163
publisher
Sveriges Ornitologiska Förening
external identifiers
  • scopus:33751214499
ISSN
1102-6812
language
English
LU publication?
yes
id
a4630ec7-6491-49e2-8905-5a4f03125774 (old id 164495)
date added to LUP
2016-04-01 16:54:06
date last changed
2021-06-23 04:04:52
@article{a4630ec7-6491-49e2-8905-5a4f03125774,
  abstract     = {We studied the foraging technique of Ospreys Pandion haliaetus during different wind speed conditions at Lake Hammarsjon, Sweden in autumn 2003. Different fishing techniques were used with a shift in relation to wind speed: (1) without hovering, (2) hovering with pure flapping flight, (3) hovering with flapping flight and gliding into the wind, and (4) hovering with pure gliding. The results supported our predictions that hovering is constrained at low wind speeds and gliding restricted to wind speeds exceeding 7 m/s. Mixing flapping and gliding flight when hovering may be done as a trade-off between increased fishing efficiency associated with flapping flight and energy-saving combined with gain in total hovering time associated with gliding intervals. The relationship between hovering time and wind speed differed significantly between males and females. At wind speeds up to about 3.0 m/s, the hovering time increased more steeply with increasing wind speed for males than for females. In contrast, hovering time was shorter for males than for females at high wind speeds. The juveniles showed a lower mean, smaller scatter, and less increase in hovering time along the wind speed gradient.},
  author       = {Strandberg, Roine and Alerstam, Thomas and Hake, M},
  issn         = {1102-6812},
  language     = {eng},
  number       = {3},
  pages        = {150--163},
  publisher    = {Sveriges Ornitologiska Förening},
  series       = {Ornis Svecica},
  title        = {Wind-dependent foraging flight in the Osprey Pandion haliaetus},
  volume       = {16},
  year         = {2006},
}