BIOL 117 Lecture 18: Chapter 18 - Competition and Niche Space
23 Jul 2016
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Study tness (# of offspring), bene ts/losses: bene ts usually seen on nutrient intake. Competition: both individuals have a cost (-/-) Intraspeci c competition: within species: population growth, compete for everything - same requirements/resources needed for survival, gypsy moth caterpillars. 2006: overpopulation, had to begin eating tree species they normally wouldn"t, massive crash before winter. Niche space: all factors in environment required for survival. Range of resources a species can use or tolerate: humidity/food size, temperature/time of feeding, season/nesting material, competitive exclusion principle: two species with identical niches cannot coexist inde nitely. One will beat the other out in competition. One species may go extinct from area: fundamental vs. realized niche. Coyotes (eastern and western) vs. wolves: closely related, different sizes. Resource partitioning: separation of niches to smaller sub-niches Monday, november 9, 2015: warblers (different feeding areas; red, black, orange seeds) Myrtle warbler: forages at bottom of tree. Bay-breasted warbler: forages at middle of tree.
