When should a territory resident attack?

Citation
Pv. Switzer et al., When should a territory resident attack?, ANIM BEHAV, 62, 2001, pp. 749-759
Citations number
63
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences","Neurosciences & Behavoir
Journal title
ANIMAL BEHAVIOUR
ISSN journal
0003-3472 → ACNP
Volume
62
Year of publication
2001
Part
4
Pages
749 - 759
Database
ISI
SICI code
0003-3472(200110)62:<749:WSATRA>2.0.ZU;2-A
Abstract
Models of territorial defence tend to omit two characteristics of many terr itorial systems: repeated intrusions by the same individual and the learnin g processes of residents and intruders. Here we present state-dependent, dy namic models of feeding territories, designed to investigate temporal patte rns of resident aggression towards intruders that are capable of spatial le arning. We compare two types of models: (1) a nomadic intruder model, in wh ich intruders never visit the same territory twice, and (2) a single, repea t intruder model, in which an intruder may repeatedly intrude into a given territory but is less likely to do so after being attacked. These two model s produce qualitatively and quantitatively different patterns of aggression by residents. For instance, residents with intruders that may repeatedly i ntrude have high initial attack rates, regardless of initial probability of intrusion, but their attack rates decline over time. In contrast, resident s in the nomadic intruder model do not attack intruders if intrusion rates are moderately high, and their attack rates are constant and high for most of the period of territory tenure. In addition, residents of both nomadic a nd repeat intruder scenarios stopped attacking intruders for a short period before voluntarily abandoning their feeding territories. The results of ou r models suggest that repeated intrusions and learning processes have a dra matic effect on territorial defence. (C) 2001 The Association for the Study of Animal Behaviour.