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SUMMARY:Interactions between home-ranging animals - Simon Benhamou (CNRS (
 Centre national de la recherche scientifique))
DTSTART:20230911T143000Z
DTEND:20230911T151500Z
UID:TALK203347@talks.cam.ac.uk
DESCRIPTION:The way interactions between two free-ranging animals can be i
 nvestigated is often limited because the two individuals are not directly 
 observed but only remotely localized. Furthermore\, the successive relocat
 ions of the two animals are not necessarily acquired synchronously\, and t
 he delay between two successive locations may be too long to make it possi
 ble to determine the behaviour at the small scale at which interactions ma
 y occur. I will focus here on the case\, which is usual for most species o
 f vertebrates\, of individuals that restrict themselves their movements wi
 thin an area called home range. This is a nice way to share the whole spac
 e\, allowing each individual to be quite familiar with its environment. Ho
 me ranges may correspond to more or less exclusively used areas\, either b
 ecause they are defended against conspecifics (they are then called territ
 ories) or as a by-product of optimisation of foraging\, or may largely ove
 rlap\, depending on species\, sex\, and context. With possibly non-synchro
 nous (and even non time-stamped) relocations acquired at a low rate\, one 
 can (i) estimate&nbsp\; 'static interaction'\, i.e. the overlap of space u
 se distribution\, which is a measure of the potential for possible interac
 tions\, (ii) map where this potential is maximum (which may correspond to 
 territory boundaries when space is defended)\, and (iii) and highlight whe
 ther one individual spatially dominates the other (when space is not defen
 ded). Synchronized locations make it possible to go further\, in particula
 r to determine whether two individuals that share some space meet each oth
 er more or less than expected if they moved fully independently of each ot
 her. When such relocations are acquired with a rate to warrant that they a
 re are highly serially correlated\, it becomes possible to investigate 'dy
 namic interactions'\, i.e. whether two individuals tend to move together o
 r to avoid each other\, by comparing the distribution of observed inter-in
 dividual distances with the distribution of distances expected for two ind
 ividuals that would move independently of each other. Additional possibili
 ties come from estimating the probability that the two individuals meet (i
 ) at some place at a given time (ii) at some place at any time\; (iii) any
 where at a given time and (iv) anywhere at any time. Altogether\, these va
 rious possibilities open interesting perspectives towards a better underst
 anding movement ecology of home-ranging animals.
LOCATION:Seminar Room 1\, Newton Institute
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