BIOLOGY 1B Lecture Notes - Lecture 20: Amphiprioninae, Character Displacement, Allopatric Speciation
Document Summary
Correlated graphs, but may or may not be a causal relationship. Wolves and moose of isle royale graph. Island has deciduous forest area, ponds, moose, and wolves. Lake superior has a big island called isle royale. For many years, there were no wolves on that island. One year, a small pack of wolves arrived. Started population of new wolves that weren"t originally there. Crash of wolves follows a decline in moose populations. Cold (cid:449)i(cid:374)ter little (cid:448)egetatio(cid:374) a(cid:374)d parasites (cid:373)oose populatio(cid:374) collapsed. Wolves lacked genetic diversity (founder effect); had spinal deformation; wolf numbers started dropping as a result of genetic inbreeding; few wolves left. Data based on canadian trappers in the subarctics. T(cid:449)o (cid:272)(cid:455)(cid:272)les are (cid:862)e(cid:374)trai(cid:374)ed(cid:863) (cid:272)orrelated; as l(cid:455)(cid:374)(cid:454) i(cid:374)(cid:272)reases the(cid:374) so does hare; vice versa; implies causality. U(cid:374)spots solar flares fro(cid:373) su(cid:374) produ(cid:272)ed e(cid:448)er(cid:455) (cid:1005)(cid:1004)-11 years. Logistic equation: dn/dt = rn (1-n/k), r = per capita growth rate (b-d) = per capita births minus per capita deaths.
