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GEOG 3110 - Lecture Notes
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All of the lecture notes from GEOG 3110 - Biogeography, taught at the University of Guelph. All hand-written notes.
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GEOG 3110,NOTES
, Biotic & Natural Resources
RELATIONSHIP BETWEEN SCIENCE AND MANAGEMENT
"
Scientists study biophysical systems to key
"
successful
to
managem
'
-
understand their functionality scientific basis for both
settin
Resource systems
manage biophysical
managers set making management decisions
•
to achieve objectives by policymakers
SAGUARO CACTUS
1933 National Monument 1944
Saguaro suppression operations
-
• -
-
1939 dead / by
↳
Evidence of disease date
dying saguaro as observed
-
-
↳
park managers Only old seemed
saguaro
1941 bacterium isolated from 1970 of mortality conc
decaying tissue cause
'
-
- -
Experimental 1. 3km2 was cleared of to climatic variability ( hard
'
diseased Research past studies shoul
saguaro
'
on
↳
differences between
No marked conducted when the
pathogen
treatment and controlled lots discovered
WHAT CAUSES WILDFIRES ?
•
Fuels accumulation
'
Evidence for fuels :
↳
harder to control
dangerous
↳
Fire suppression post
I>
Bigger ,
more ,
put out fire ↳
Fires have
more trees stay intact /
gotten large s
=
fuels Evidence for weather :
grow more
.
=
Weather weather variation ↳ Pacific Decadal Oscillatio
years among
'
-
rather than fuel variation associated with lived El Nino -
like patter
stand
age
climate variability
↳
'
Humans Pacific Northwest fires
and extensive the
during
FIRE SUPPRESSION PARADOX
Fire suppression → Less area burned →
Longer Fires smaller but more
fre
'
are
-
time between fires older forests ,
→ More fuels protected zones of the Boreal
accumulation → Uncontrollable fires → More
.
Detection is biased in unprotec
typically only fires
area burned
larger are s
-
3 key assumptions :
-
No consistent relationship betw
↳
Fire suppression is effective and level of protection
↳
Older forests have more fuel than
younger ones
Longer fire
↳ intervals
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