BI111 Chapter Notes - Chapter 178: Allele, Logistic Function, Exponential Growth
Document Summary
Chapter 178: populations, interactions w/in pop & b/w pop & their envio = dynamic flux in pop size & density. Pop: group of ind of particular species living in given area. Pop ecology: study of the dynamics of that pop & its interactions w/ envio. # of ind in several small areas are counted. Animals collected from envio, marked & released, then recaptured: was used for rare dormant orchids, # taken as avg density. Est total pop = (total # captured (seconds) x (#marked)/ total # recaptured w/ mark. Dispersion: differences in spatial patterns across its range. Pop growth or declination depends on balance of inputs and outputs inputs. Exponential growth (dn/dt=r(growth rate)n); rate of pop growth. Logistic growth: pop grows exponentially then decreases and equilibrates: carrying capcaity (k): limit beyond which pop cannot grow; depends on available food, nutrients, space, nesting sites r-selected species.
