module 3 Flashcards
inter-actions is between diffrent species or same
diffrent
intra- actions is between diffrent or same species
same
symbiosis
when the interaction is close and long term
competition
both species do worse when together
comensalism
one species does beter and one is unaffected when together
Amensalism
one species does worse and one is unaffected
Antagonism
One species does worse and one does better
mutualism
both species do better when together
co-evolution is
evolutionary change in one species can evoke reciprocal change in the other species
mutulists must
- locate partner
- establish associations
- disperse afterwards
endosymbiont
any organism that lives within the body or cells of another organism often(but not always) to mutual benefit
evidence for mutualism
Mutualisims are stable over time
have clear orgins as antagonisms
masisve and diverse communities of symbionts that every organism carries
microbiome
natural host
the host species an infectious organism normally infects
spillover
parasite winds up in new host to which it is not adapted to be transmitted among
cross-species transmission
any transmission event from thenatural host species to a novel host species
co-divergence
Among host-specific parasites/symbionts and their hosts
congruent host and parasites
parasite evolutionary divergence linked to host evolutionary history
virulence is
the harm done by a pathogen to the host following an infection
a relative term that describes the severity of a disease
pathogenicity
refers to whether or not a pathogen causes disease
emerging infections
new infections to humans
overal transmition should be the greatest at
intermediate levels of virulence
R0 or R not represents
expected number of secondary cases produced by a single infected individual in a completely suceptible population
