BIOL 230 Lecture Notes - Lecture 4: Intraspecific Competition, Interspecific Competition, Ecosystem Engineer
Document Summary
Organic nutrients (live prey molecular size), light. A species niche comprises the resources and conditions it needs to survive. A resource is anything that is limited in supply, and will be unavailable to others after use. More species overlap in niches, the more intense is resource competition. ** species with identical niches cannot coexist in the long-term** (one always goes extinct) Species avoid intense competition by: shifting habitat to avoid the competitor ex. Mosquitoes avoid competition: using different resources ex. Poor competitors can sometimes persist by being good at something else. Trade-offs: species have a fixed amount of energy to invest in a strategy. Probability of offspring surviving (looking @ survival of 2 generations) Low fecundity -> high survival (cid:862)r(cid:863) a(cid:374)d(cid:863) k(cid:863) are two para(cid:373)eters of populatio(cid:374) d(cid:455)(cid:374)a(cid:373)i(cid:272)s (cid:373)odels that we will lear(cid:374) a(cid:271)out i(cid:374) u(cid:374)it r- selected species. Result: ability to colonize new habitats quickly, but poor competitor. High investment in adult and juvenile survival.
