DEPARTMENT OF MATHEMATICAL & STATISTICAL SCIENCES
UNIVERSITY OF ALBERTA
  

MATHEMATICAL BIOLOGY SEMINAR
 

MONDAY, February 3, 2003

3:00 PM

CAB 657
 

Dr. Bill Fagan

Department of Biology
Maryland Unviversity

 

Rarity and spatial scale in desert fishes: quantifying the linkage between fragmentation and extinction risk across species

 

Understanding the influences of habitat fragmentation on conservation efforts requires a concerted effort to clarify what we actually mean by "connectivity." Over the last few years, ecologists have begun using a variety of mathematical techniques to characterize how severely human activities have fragmented different landscapes. These include quantitative techniques from spatial statistics, graph theory, and biogeography. Using a biodiversity database for desert fishes, I will discuss the dependence of extinction risks on how fragmentated species' distributions are, using both scale-dependent and scale-independent metrics. I will also provide an overview of the changes in these species' distributions over the last few decades and discuss the implications of these changes for species' risks.