BIOL 1113 Lecture Notes - Lecture 6: Escherichia Coli, Fecundity, Emergence
Document Summary
Crash in food cycle or surplus production (snowy owls: synchronous. Predator saturation: e. g. acorns, cicadas, ecological release, e. g. fire. If below carrying capacity + no competition or other interactions. Chance & proximity: mobile & territorial. E. g. , seabirds random along coast, clumped at river openings, uniform within colonies. How to distinguish distribution patterns: nearest neighbour distances. If isolation (e. g. , islands) & small populations (founder effect), rapid drift & natural selection, speciation (allopatric model) Definitions: network of distinct populations linked by gene flow. Habitat fragmentation chopping landscape into little blocs (vs. habitat loss) corridors sp. -specifc emergent properties: spatial, temporal. Births vs mortality age & sex structure. Mostly #s; e. g. , why do populations of some species have more rapid population growth than others: generation time: avg. interval from birth to reproduction. E. coli about 20 minutes. , dandelions about 6 weeks, humans about 20 years. Residual variation from other factors: birth rate (fecundity) : offspring produced/time.
