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BEGIN:VEVENT
DTSTAMP:20260628T024218Z
DTSTART;VALUE=DATE-TIME:20071120T160000
DTEND;VALUE=DATE-TIME:20071120T170000
SUMMARY:Beata Oborny (Eotvos Univ Budapest\, Plant Taxonomy and Ecology)
TZID:Europe/London
UID:20071120-094d43d5385c299a01386c3bd891649d@warwick.ac.uk
CREATED:20070913T084433Z
DESCRIPTION:Title: Scaling laws at vegetation boundaries - a physical pro
 blem with ecological implications Abstract: Several ecological studies s
 uggest that sharp vegetation boundaries can emerge even across smooth en
 vironmental gradients. A typical example is a treeline across altitude o
 r latitude. We applied the theory of critical phase transitions to study
  the transition zone from high-density\, connected to low-density\, frag
 mented state in the vegetation cover. Spatially explicit simulations wer
 e applied to model the dynamics of colonization and extinction\, by whic
 h the boundary was shaped. Connectivity was characterized from the persp
 ective of various species which differ in step length\, i.e. dispersal o
 r migration distance. At every step length and every gradient (slope)\, 
 the edge of the connected patch was found to be fractal with dimension 7
 /4. The length and width of this “hull edge” scaled as powers of the gra
 dient with exponents that could be directly predicted from percolation t
 heory. These results were the same for different spatial models suggesti
 ng that there are universal laws in the geometry of ecotones. We propose
  to use the hull edge for delineating the boundary of a vegetation type 
 unequivocally\, and detecting boundary shifts due to climate change.
LOCATION:Maths B1.01
CATEGORIES:forum
LAST-MODIFIED:20120709T145406Z
ORGANIZER;CN="":
END:VEVENT
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