BIOL208 Lecture Notes - Lecture 18: Interspecific Competition

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1 May 2018

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Concerning Isoclinic Graphs

• Isoclines represent what zero growth looks like for each species

• N1 = increase and decreases of species 1 abundance (apply for species 2 too)

• Solid = 1, dashed = 2

• Linear equations

• Figure out which species can outcompete the other species (who will win the scenarios)

• Draw combined abundances of each species (dot) and figure out which direction they

would go

Competitive Exclusion Principle: Two species with the same niche cannot co-exist indefinitely

• Stable coexistence rarely occurs. More likely than not species will occupy different

realized niche, and sometimes if pressure is strong enough, will alter the dimensions of

the fundamental niche

• Ca’t outcopete the other species, so just change their niche completely to reduce

the competition

Character Displacement: Chages i the physial harateristi of a speies’ populatio

because of natural selection for reduced interspecific competition

• If you put 2 fish in one tank with 2 different food sources, will eventually differentiate

differently to pick one food source and physical characteristics will be different from

each other

Eating is exploitation

• Some of the strongest interactions are predation and herbivory

• Herbivores eat live plat aterial, ut usually do’t kill the etire plat

o Some herbivory increases plant growth rate

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