Competition Flashcards
How does competition (indirect and direct) affect fitness?
both decrease fitness because they are costly
Trophic cascades are an example of what kind of competitive interaction:
Apparent/indirect
a species does not directly impact another
Think starfish and sea urchins affecting a third species
Brassica nigra vs Nassella pulchra are an example of what kind of competition?
apparent competition
a species can facilitate the presence of a predator that affects its competitior
How does Brassica nigra compete with Nassella pulchra
it protects rodents and the rodents eat nassella pulchra
Planthoppers have a high level of this sort of competition
Intraspecific
High intraspecific competition for planthopper bugs is likely attributed to
limited resources
Competition for resources among high density populations results in what two behaviors
self thinning and high mortality rate
What is lower in high density populations
growth rate and weight
Name the math model used for interspecific competition
lotka-volterra
Name the lotka volterra model
dN1 / dt = rm1N1 ((K1-N1-α12N2) / K1)
dN2 / dt = rm2N2 ((K2-N2- α 21N1) / K2)
r in the lotka volterra model stands for
growth rate parameter
K stand for
the total sustainable population size
The lotka voltera model predicts the coexistence of two species
when interspecific competition is weaker than intraspecific competition
The variable αAB is
the
effect of individuals of
species B on rate of
population growth of
species A.
Liebig’s law of the minimum states that
the population size of species is constrained by whatever resource is in the shortest supply
