Biotic Resistance What can stop invasive species? Liz Schultheis April 21, 2011.

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Presentation transcript:

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

Why do some invaders fail? Diversity – lots of competition – no space or resources left Enemies – diseases, predators, herbivores

Native Blue Crab Likes soft sandy areas Lives in shallow water Prefers ocean water that’s not too salty Invasive Green Crab Introduced from Europe Likes the same areas that the Blue Crab likes Catherine E. deRivera & others 2005

Native Blue Crab Range Invasive Green Crab Range

SOUTH NORTH LOCATIONS # Blue Crabs # Green Crabs 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 = 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 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 P P P PP P P N = invader resource P = native species resource

N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P Diversity = 1 N = invader resource P = native species resource

N N N P P P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P Diversity = 3 P P P N N N = invader resource P = native species resource

N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P Diversity = 3, Fertilized N = invader resource P = native species resource

N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P N N N N N N N P P P P P P PP P P Diversity = 3, Disturbance N = invader resource P = native species resource