EESA01H3 Lecture Notes - Lecture 8: Keystone Species, Allopatric Speciation, Ecosystem Services
Document Summary
Basi sin the first place- there was no life earlier, and they also started to diverge, Evolution from genetic changes, or natural selection which favours reproduction by passing better genes to future generations. Envt stress- atmospheric changes, with time, causes stress on articular species, adapt to envt changes, than the ones easy to adapt, get massively diluted, the genes which are better will dominate the population, Eg- the thick shell is more favoured if it can protect you from predators, but can also ake you slow to move or force more energy. Divergent evolution- individulas that live in diff areas but maybe come from the same place, exp diff food sources, in diff stresses speies differ, Convergent evolution- 2 unrelated species in diff aresa but under same stresses and tell to adaplt to simailar envts. Boidiversity- he total variety of organisms in an area, species diversity, genetic diversity, ecosystem diversity etc. 1. 8 million species on earth,