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Biotic Resistance. What can stop invasive species? Liz Schultheis April 21, 2011. Do you know of any invasive species?. Why do some invaders succeed?. Open habitat – places to grow Available food/resources Can grow better than native species Nothing eats them! No enemies. - PowerPoint PPT Presentation
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Biotic Resistanc
eWhat can stop
invasive species?
Liz SchultheisApril 21, 2011
Do you know of any invasive species?
Why do some invaders succeed?
• Open habitat – places to grow• Available food/resources• Can grow better than native species• Nothing eats them! No enemies
Why do some invaders fail?
• Diversity – lots of competition – no space or resources left
• Enemies – diseases, predators, herbivores
Native Blue CrabLikes soft sandy areasLives in shallow water
Prefers ocean water that’s not too salty
Invasive Green Crab
Introduced from EuropeLikes the same areas that the Blue
Crab likes
Catherine E. deRivera & others 2005
Native Blue Crab Range
Invasive Green Crab
Range
SOUTH NORTHLOCATIONS
#
Blue
Cra
bs
#
Gre
en
Crab
s
SOUTH
NORTH
Winner!
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N
N = invader resource
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N
N N N N N N N N N N P P P PP P P P P P P P P PP P P P P P P P P PP P P P P P P P P PP P P P P P P P P PP P P P P P
N = invader resource
P = native species resource
N N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P P
Div
ersi
ty =
1N = invader resource
P = native species resource
N N N N N N P P P P
N N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PD
iver
sity
= 3
P P P N N
N = invader resource
P = native species resource
N N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P P
Div
ersi
ty =
3, F
ertil
ized
N = invader resource
P = native species resource
N N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PN N N N N N N N N N P P P PP P P P P PD
iver
sity
= 3
, Dis
turb
ance N =
invader resource
P = native species resource
