interactions between populations Flashcards
what are the two types of competition
interspecific
intraspecific
what is interspecific competition
competition between individuals of the DIFFERENT species
what is intraspecific competition
competition between individuals of the same species
how should a predator prey graph be drawn
peaks of prey should always be higher than predators,
when predator peaks increase, prey peaks decrease
when does competition happens
when food or water isnt present in adequate amount to satsify all individuals in a population who depend on those resources.
what happens to the rate of reproduction as competition increases
it decreases because fewer organisms have enough resources to reproduce and death rate is high.
during intraspecific competition, what individuals out of the one species survive
the ones best adapted or with suitable alleles to obtaining resources quicker than others.
those not as adapted die and fail to reproduce.
how does intraspecific competition keep population size stable
when population size drops, competition reduces and population size increases
when the population size is too high, competition increases so it decreases
what was Gauses study on interspecific competition
he studied two species individually, and noticed there population growth was normal (went through all 3 stages)
but when he combined the two species in a controlled medium, one always outcompeted the other until the other one died out
what is the effects of variables on competition
alterations of a variable, such as ph or temperature can change the outcomes of competition.
e.g. gauses study on beetle, tweaking the temperature caused the other species to outcompete instead
what are the two organism that gause studied
1- paramecium
2- flour beetle
what mechanism controls prey and predator population
negative feedback
what is gauses principle called
competitive exclusion principle
what is exponential growth
seen in log phase
rapid, steep increase
how does immigration impact population size
increases population size, increase interspecific competition
