speciation
Tags
bio/eco
cegep/3
Word count
95 words
Reading time
1 minute
Evolution with emergence of new species
Requires a barrier to prevent gene flow between subpopulations
Modes
Allopatric
Physical separation of species
=> no gene flow, independent evolution
[!example] Lake separated in two => fishes evolve separately
[!example] The two sides of Grand Canyon are inhabited by different species.
Sympatric
No physical separation of species
Agents:
- Natural selection (competition for food leads to occupation of different niches)
- Nonrandom breeding
[!abstract] niche
Lifestyle /
[!example] Small fishes mate with small fishes, and large ones mate with large ones.
Ajitani Hifumi