5stropicof capricorn 30s lowangleofincomingsunlight

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Unformatted text preview: icial
distribution
 Why
this
difference
in
dispersal?
 FL
 TX
 1989
 2006
 Potential
range:

 where
Opuntia
grows
 Fig.
52‐6
 Why
is
species
X
absent
 from
an
area?
 Yes
 Does
dispersal
 limit
its
 distribution?
 Area
inaccessible
 or
insufficient
time
 Does
behavior
 limit
its
 distribution?
 Yes
 Habitat
selection
 Do
biotic
factors
 (other
species)
 limit
its
 distribution?
 Yes
 No
 Predation,
parasitism,
 competition,
disease
 Do
abiotic
factors
 limit
its
 distribution?
 Chemical
 factors
 No
 No
 Water
 Oxygen
 Salinity
 pH
 Soil
nutrients,
etc.
 Temperature
 Light
 Soil
structure
 Fire
 Moisture,
etc.
 (Actual
range)
 Physical
 factors
 8
 4/17/09
 Fig. 52-6 How
to
stop
dispersal?
 Why
is
species
X
absent
 from
an
area?
 1.
Monitoring:

habitat
selection
 Yes
 Does
dispersal
 limit
its
 distribution?
 Area
inaccessible
 or
insufficient
time
 Does
behavior
 limit
its
 distribution?
 Yes
 Habitat
selection
 Do
biotic
factors
 (other
species)
 limit
its
 distribution?
 Yes
 No
 Predation,
parasitism,
 competition,
disease
 Do
abiotic
factors
 limit
its
 distribution?
 Chemical
 factors
 No
 No
 Water
 Oxygen
 Salinity
 pH
 Soil
nutrients,
etc.
 Temperature
 Light
 Soil
structure
 Fire
 Moisture,
etc.
 Physical
 factors
 Fig. 52-6 How
to
s...
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