Ch16 Competition2.pdf

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University College Courses
Spencer Barrett

BIO120H © Li| Page 2011 Competition Between Closely and Distantly Related Species  Charles Darwin  compet. should be most intense b/w closely related species  “As species of the same genus have usu., though by no means invariably, some similarity in habits and constitution, and always in structure, the struggle will generally be more severe b/w species of the same genus, when they come into compet. w/ each other, than b/w species of distinct genera”  similar structure = similar function  distantly related org. also use same resources Renewable and Nonrenewable Resources  nnonrenewable resources resources that are not regenerated  ex. space (only “replenished” when consumer leaves)  rrenewable resources constantly regenerated/renewed  ex. birth of prey provides continual supply of food for predators  types of renewable resources:  some renewable resources originate beyond the influence of consumers ex. sunlight  thus, consumers reduce its immediate availability but not their supply  the resource doesn’t respond to consumption  generated w/in the ecological sys.  predator-prey, herbivore-plant, parasite-host  supply of prey, plants, and hosts is constantly regenerated  by reducing pop. of resources, they reduce rate of renewal  regenerated w/in ecosystem linking indirectly to their consumers  through food chain links or abiotic processes  ex. nitrogen cycle: plants assimilate nitrate from soil  herbivores eat plants  return nitrogen to soil  broken do
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