BIO 200 Lecture Notes - Lecture 17: Amphiprioninae, Sea Anemone, Butterflyfish
30 Oct 2017
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Relations between species: neutralism- worm and eagle, commensalism- barnacles on whales, amensalism- dinoflagellates cause red tides. Mutualism: 2 organisms interact where both derive a fitness benefit (increased reproductive output) a+b or b+a. Facultative vs. obligate mutualism: facultative- the partners aren"t necessarily completely dependent on each other, example: boran people of africa and the honey guide (greater honey guide leads people to bee colonies, drive off bees, and get honey. Strategies of interspecific competition: scramble competition- same resource at different times, example: moose and rabbits, contest competition- same resource at the same time, example: jackals and vultures, hyenas and lions. Results of competition: one species wins and the other becomes extinct, competitive. Exclusion principle complete competitors cannot co-exist if resources are limited: gause"s principle, co-existence- shared habitat, shifting advantages (flour beetles, populations are maintained below competitive levels (influences such as disease and predation, examples: african antelope and predators and starfish.
