7 Flashcards
Competitive exclusion conditions? 2•
•If isoclines do cross, but each species is more limited by the other than it is by itself (alpha and beta > 1), then Intraspecific competition < interspecific competition. The winner depends on initial conditions.
•When isoclines do not cross, competitive exclusion always occur.
The winner during a competition exclusion model depends on?
Initial conditions.
Stable coexistence conditions? 2•
•Zero net growth intersect and
•one or both species must inhibit itself more than it is inhibited by other species (intraspecific competition > interspecific competition).
How to win during competitive exclusion? 2•
•Be a stronger competitor
•Having a higher carrying capacity
Asymmetrical competition does/does not guarantee competitive exclusion?
Does not
If beta > 1, can both species coexist? 3•
Yes as long as
•alpha is sufficiently low and
•K2 is enough higher than K1
When two species use the same limiting resource in the same way, then ecological theory predicts that?
They cannot coexist indefinitely due to eventual competition exclusion.
Mutualism, commensalism, predation/parasitism, amensalism, competition? 5•
• + +
• + 0
• + -
• 0 -
• - -
!!!!!!!When one species exhibits a trait with a selection pressure on another species, and the second possesses a trait as a counter-selection pressure on the first, evolutionary fates can become?
Permanently locked. It usually happens with reciprocal arms races in parasitic/predatory interactions, or when both species gain from their interaction (mutualism).
Coevolution?
Evolving together due to a biotic interaction between two species.
Positive interactions?
No species is harmed + +, + 0
Each partner in a mutualistic interaction acts in ways that serves it own?
Ecological and evolutionary interests.
Can positive interactions affect abundances and distributions of populations including the structure of communities?
Yes
Facilitation?
•mutualism
•commensalism
Obligate mutualism?
One species fully depends on another.
