BIOB50H3 Lecture Notes - Lecture 8: Commensalism, Overgrazing, Species Richness
Document Summary
Parasitism tapeworms bene t from absorbing nutrients in human intestine, humans lose nutrients; +/- Mutualism owers gain pollination, bees gain nectar and pollen; +/+ Commensalism egrets bene t from insects stirred up by cattle but cattle are unaffected; +/0. Predation and herbivory impact species abundance and richness of their prey, which can impact other species relationships. Can lead to shift from one community type to another. There"s a direct effect on the prey being eaten but an indirect effect on things that it interacts with e. g. one species overgrazing led to a change in the community structure. E. g. golden snails cause habitat shift heavy predation can lead to exclusion of prey. Parasitism an interaction in which one organism consumes the tissues or uids of another organism that it lives on or inside (its host); -/+ Parasites have close ties to hosts: parasites are typically symbionts (species that live in or on other organisms)
