BIO120H1 Lecture Notes - Lecture 9: Sympatric Speciation, Ecological Speciation, Reproductive Isolation

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Spencer C H Barrett

Document Summary

Taxonomic (or morphological: based primarily on distinct morphological differences; some value judgement (no limits of discontinuity) therefore evolutionary biologists tend to prefer looking at species through a biological perspective since it is based on genetics. Biological: based on inter-fertility (crossability) among individuals. Concepts vary among different groups of organisms no universal species concept. I(cid:374)trodu(cid:272)ed the (cid:271)iologi(cid:272)al spe(cid:272)ies (cid:272)o(cid:374)(cid:272)ept as (cid:862)a group of i(cid:374)ter(cid:271)reedi(cid:374)g (cid:374)atural populatio(cid:374)s that are reprodu(cid:272)ti(cid:448)el(cid:455) isolated fro(cid:373) other su(cid:272)h groups(cid:863) Sympatric: more controversial for zoologists, a population -> some individuals become genetically differentiated -> leads to a new species in the sympatric, occurs commonly in plants and is rare in animals. Stages when ri can occur: finding a compatible mate, mating and fertilization, development of zygote, adult growth and survival, reproduction and fertility of offspring. Speciation involves the evolution of reproductive isolation between populations: premating isolation preventing zygote formation. Temporal (time of the season that a particular insect emerges), behavioral (courtship displays)