BS 182H Lecture Notes - Lecture 24: Interspecific Competition, Paramecium, Intraspecific Competition
17 Mar 2016
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Document Summary
Competitive exclusion controlling salmonellus and foodbourne pathogens: normal gut microbiome competitively excludes salmonella, antibiotics may disturb the normal gut microbiome, lactobacillus = chicks fed probiotics help with pathogens, eating probiotics helps exclude bacteria from colonizing/urogenital infections, can be even more effective than antibiotics. Differentiation of niches = resource partitioning: niche differentiation is often evident from morphological character displacement, resource partitioning = ghost of competition past", darwin"s finches, predation influences the distribution and abundance of prey species; most obviously by killing some and scaring the rest, predators can increase biodiversity by preventing competitive exclusion, a keystone predator blocks competitive exclusion. Mutualism: acacia trees and their ants, actual mutualism (+/+) is difficult to maintain, ants guard the plant, and the plant feeds/houses the ants, plants can kick out the ants if there"s nothing to be protected from (e. g. elephants, no mutual enemy = no friendship, there can be cheating/selfishness in mutualism.
