ANT 301 Lecture Notes - Species Problem, Macroevolution, Linnaean Taxonomy
Document Summary
So far, we"ve been talking about populations (level at which evolution occurs: study of evolution in populations: microevolutions. How do you get new species: one of the fundamental questions in macroevolution. Liger: m lion x f tiger - sterile. Hybrid zones occur between different species ranges: mode #3: sympatric speciation: individuals of a single population in one habitat gradually diverge over time (no large-scale spatial separation or physical barrier- rare) Each lays eggs on different genus of host: tree hopper plant in same forest. Eggs hatch at different times in response to spring sap flow. Diff. species reach sexual maturity and mate at different times: in each of these three modes of speciation, one ancestral species gave rise to two or more descendant species, cladogenesis: speciation by splitting of lineages. Special type of cladogenesis, rapid series of multiple. Primate example: lemurs. gradual transformation of one species into another.
