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J. theor. Biol. (1997) 184, 279289 00225193/97/030279 + 11 $25.00/0/jt960248 7 1997 Academic Press Limited
 

Summary: J. theor. Biol. (1997) 184, 279289
00225193/97/030279 + 11 $25.00/0/jt960248 7 1997 Academic Press Limited
A Mechanism for Passive Range Exclusion: Evidence from the European Badger
(Meles meles)
PAUL D. STEWART, CARL ANDERSON AND DAVID W. MACDONALD
Wildlife Conservation Research Unit, Department of Zoology, South Parks Road, Oxford,
OX1 3PS
(Received on 4 March 1996, Accepted in revised form on 1 August 1996)
The Passive Range Exclusion (PRE) Hypothesis provides a mechanism whereby species that rest or
breed in communal residences, but forage independently on dispersed food items, may avoid entering
the core home ranges of neighbouring groups. A stochastic simulation shows that as the occupants of
a communal residence travel outwards to feed, their activities create a gradient in food availability. Food
closest to the point of origin tends to be discovered first and at the highest rate. As the foraging period
continues, the probability of encountering unexploited food increases with distance from the residence.
Areas of relatively high food availability persist as ridges between neighbouring communal residences.
The simulation predicts that once such a gradient is established, a strategy of preferential feeding in
these areas optimizes food intake. Feeding excursions deep into neighbouring ranges are
disadvantageous because areas of lower food availability are encountered and travel times back to the
home residence become longer. The observed reluctance of individuals to forage close to neighbouring
residences can therefore be explained partly or wholly as a result of exploitation competition and feeding

  

Source: Anderson, Carl - Synthetic Intelligence, Qbit, LLC, Bethesda, MD

 

Collections: Environmental Sciences and Ecology; Engineering; Mathematics