Lecture 7: Species interaction

define competition. What are the interaction values.

(-/-)

Both species have a negative effect on the population size of the other 

define predation. what are the interaction values.

(+,-)

One species has a negative effect on the population size of the other. The other species has a positive effect on the population size of the other. 

define parasitism. what are the interaction values?

(+,-)

Parasitic organisms consume part of a host - may or may not kill host. 

define disease. what are the interaction values?

(+,-)

1. Disease grows while it kills population 

what is mutualism. what are the species interaction values?

Both organisms are positively effected. (ex. eels has parasites removed and prawn gets food)

what is commensalism. what are the species interaction values?

(+,0)

a long-term biological interaction where one organism benefits while the other is neither helped nor harmed (ex. Cattle grazing while bird eats insects off it)

define Amensalism. what are the species interaction values?

Negative to one population and neutral to the other (ex. Human stepping on an ant by accident)

define intraspecific competion

competition within a species

define interspecific competition

competition among several species

Intraspecific competition gets higher as population gets farther/closer to carrying capacity 

closer

what is gause’s law (Competitive exclusion principles)