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Predator versus prey: on aerial hunting and escape strategies in birds

Hedenström, Anders LU and Rosén, Mikael LU (2001) In Behavioral Ecology 12(2). p.150-156
Abstract
Predator and prey attack-escape performance is Likely to be the outcome of an evolutionary arms race, Predatory birds are typically larger than their prey suggesting different flight performances. We analyze three idealized attack-escape situations between predatory and prey birds: climbing flight escape, horizontal speeding, and turning and escape by diving. Generally a smaller bird will outclimb a larger predator and hence outclimbing should be a common escape strategy. However, some predators such as the Eleonora's falcon (Falco eleonorae) has a very high rate of climb for its size. Prey species with an equal or higher capacity to climb fast, such as the swift Apus apus, usually adopt climbing escape when attacked by Eleonora's falcons.... (More)
Predator and prey attack-escape performance is Likely to be the outcome of an evolutionary arms race, Predatory birds are typically larger than their prey suggesting different flight performances. We analyze three idealized attack-escape situations between predatory and prey birds: climbing flight escape, horizontal speeding, and turning and escape by diving. Generally a smaller bird will outclimb a larger predator and hence outclimbing should be a common escape strategy. However, some predators such as the Eleonora's falcon (Falco eleonorae) has a very high rate of climb for its size. Prey species with an equal or higher capacity to climb fast, such as the swift Apus apus, usually adopt climbing escape when attacked by Eleonora's falcons. To analyze the outcome of the turning gambit between predator and prey we use a Howland diagram, where the relative linear top speeds and minimum turning radii of prey and predator define the escape and danger zones. Applied to die Eleonora's falcon and some potential prey species, this analysis indicates that the falcon usually wins against the example prey species; that is, the prey will be captured. Level maneuvering hunting is the most common strategy seen in Eleonora's falcons. To avoid capture via use of this strategy by a predator, the prey should be able to initiate tight turns at high linear speed, which is facilitated by a low wing loading (weight per unit of wing area). High diving speed is favored by large size. Lf close enough to safe cover, a prey might still opt for a vertical dive to escape in spite of lower terminal diving speed than that of the predator. On the basis of aerodynamic considerations we discuss escape flight strategies in birds in relation to morphological adaptations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Behavioral Ecology
volume
12
issue
2
pages
150 - 156
publisher
Oxford University Press
external identifiers
  • scopus:0035093565
ISSN
1045-2249
language
English
LU publication?
yes
id
e16f6059-6cd9-415e-a093-62cde85d9818 (old id 145869)
alternative location
http://beheco.oxfordjournals.org/cgi/content/full/12/2/150
date added to LUP
2007-06-26 07:58:55
date last changed
2018-06-24 03:42:22
@article{e16f6059-6cd9-415e-a093-62cde85d9818,
  abstract     = {Predator and prey attack-escape performance is Likely to be the outcome of an evolutionary arms race, Predatory birds are typically larger than their prey suggesting different flight performances. We analyze three idealized attack-escape situations between predatory and prey birds: climbing flight escape, horizontal speeding, and turning and escape by diving. Generally a smaller bird will outclimb a larger predator and hence outclimbing should be a common escape strategy. However, some predators such as the Eleonora's falcon (Falco eleonorae) has a very high rate of climb for its size. Prey species with an equal or higher capacity to climb fast, such as the swift Apus apus, usually adopt climbing escape when attacked by Eleonora's falcons. To analyze the outcome of the turning gambit between predator and prey we use a Howland diagram, where the relative linear top speeds and minimum turning radii of prey and predator define the escape and danger zones. Applied to die Eleonora's falcon and some potential prey species, this analysis indicates that the falcon usually wins against the example prey species; that is, the prey will be captured. Level maneuvering hunting is the most common strategy seen in Eleonora's falcons. To avoid capture via use of this strategy by a predator, the prey should be able to initiate tight turns at high linear speed, which is facilitated by a low wing loading (weight per unit of wing area). High diving speed is favored by large size. Lf close enough to safe cover, a prey might still opt for a vertical dive to escape in spite of lower terminal diving speed than that of the predator. On the basis of aerodynamic considerations we discuss escape flight strategies in birds in relation to morphological adaptations.},
  author       = {Hedenström, Anders and Rosén, Mikael},
  issn         = {1045-2249},
  language     = {eng},
  number       = {2},
  pages        = {150--156},
  publisher    = {Oxford University Press},
  series       = {Behavioral Ecology},
  title        = {Predator versus prey: on aerial hunting and escape strategies in birds},
  volume       = {12},
  year         = {2001},
}