lecture6 - Territoriality 29 June Territory an exclusive...

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Territoriality 29 Ju ne 1 Territory Territory – an exclusive area used and defended by an individual Distinguishing Characteristics of Home Ranges and Territories Distinguishing Characteristics of Home Ranges and Territories ± All animals have a home range, but only some have territories ± Home ranges may overlap, but territories do not overlap AB Home ranges Territories ± Territories are defended Territory Defense Mechanisms: ± Aggressive Aggressive – attacking, chasing ± Passive – vocalizations, displays, scent markings How to Measure Territory Size: How to Measure Territory Size: use convex polygon method Watch how far owner chases intruders Watch where intruders elicit a defensive response by the owner Territory Functions: Territory Functions: 1. Mating – males exclude only other conspecific males 2. Predator avoidance – spacing out reduces detection 3. Reduce disease – spacing out reduces transmission 4. Feeding – provides an adequate food supply
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Territoriality 29 Ju ne 2 5. Limits population size Non-territorial individuals (floaters) have no fitness Wynne-Edwards Hypothesis: territoriality limits population density below the level where overexploitation would occur, and thereby prevents population extinction (group selection).
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lecture6 - Territoriality 29 June Territory an exclusive...

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