ENV100Y5 Lecture Notes - Lecture 17: Sympatric Speciation, Extinction Event, Vulnerable Species
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ENV100Y5 Full Course Notes
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Session 17: evolution, biodiversity and population ecology (iii) (19-10-15) Populations can be separated in many ways. Sympatric speciation = populations become reproductively isolated within the same area. Life"s diversity results from numerous speciation events. Extinction = the disappearance of a species from earth. Most extinction from interactions with other species. Some species are more vulnerable to extinction than others. Rapid environmental change may lead to extinction. Endemic species: species with a small geographic distribution. Small populations: lack genetic diversity: less resilience when you lack diversity because there is less variability. Slow growth potential: long time to mature, few offspring, etc. There have been 5 mass extinctions in ~ 600 my. Mass extinction: 50 95% of all life gone. Population ecology = quantitative dynamics of populations. Ecosystem ecology = living and nonliving components of systems. The environment in which an organism lives. Habitat selection = non-random use of available habitat. Human activity conflicts with this process e. g. fragmentation.
