Navigation+Capacity

=Overview= toc

As a component of the movement ecology paradigm, the navigation capacity describes the ability (or lack thereof) of an individual to make decisions about targeting and directing movement.

=Directed Movement (cognitive paradigm)=

Within perceptual range

 * resource/attraction
 * risk/repulsive

External to perceptual range

 * Four types of strategies identified by Trullier et al (1997) describe use of memory cues
 * can form cognitive maps defined by memory cues - can effectively 'learn' cues?

=Random Walks (random paradigm)=

Random walks (in the framework of the movement ecology paradigm) are a special case of navigation capacity, where there is no information (either perceived by or available to the individual) on which the individual bases navigational decisions. In that case, the motion capacity is represented as an identity map equal to 1, and movement is a stochastic selection from the probability map generated by the motion process. The arbitrary (ie. uninformed) choice of a random function to represent this motion process can have a significant effect on the eventual behavior of the individual. This approach represents a statistical approach to describing movement as opposed to mechanistic.

=Multiple Modes of Movement=


 * Can have multiple modes of movement - different set of rules to respond differently to highest priority needs (ie. foraging v. establishing a territory)
 * Movement rules can also be altered according to current state or conditions; ie. local movements might be dictated by foraging strategy, while agents without 'home range' may forego foraging strategy to focus on locating suitable territory (short vs. long range movement, micro vs. macro perception of environment)
 * other examples listed on 691 of Tang and Bennett (2010)


 * based on weather conditions, elk agents switch between local random movement to long-distance mode biased by targeted patches
 * utilized an evolutionary algorithm that allows the agents to learn
 * Bennett and Tang (2006)

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