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Lecture

Lecture 22

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Department
Biology
Course
BIO120H1
Professor
James Thomson
Semester
Fall

Description
Lecture 22 28 November Application of evolutionary concepts - Lantana camara o Introduced in India by British o From Caribbean o Nice hedging plant o Tourism: see tigers on elephants o Moved to woodlands o Effects mating success of tiger: tigers changed their range of habitat, therefore, no tourism and less people o Has a chemical that effect tigers - Cane toad invasion of tropical Australia o Introduced in Australia o Control insects on Hawaii - Nile Perch in Africa o Extinction cichlid fish o People don’t really like to eat it - Asian carp in youtube Biological invasions: the successful establishment of a species in a region not previously occupied followed by rapid range expansion Native - An indigenous species that occurs wild in a given region Alien - Species that has been introduced to a part of the world to which they are not native Negative consequences - Disrupt eco processes in natural plant & animal communities o Goats; eat everything o Snakes, foxes o New Zealand and Australia - Displace native species leading to their extinction - Effects on human health o Microorganisms are invasive - Economic & social impacts through reduction of yields in agriculture & fisheries o Poisons sprayed on agriculture to control invasive species o Ecological economics  Invasive species in the USA  120$ billion per year  50000 introduced species, number rising  42% of threatened & endangered species at risk because of the invasions Enemy release hypothesis - In the native region specie has a lot of enemies that evolved with it - When introduced you leave enemies behind - Disturbance: natural disturbances(common, ), now human disturbance o Amazon forest o Better in the open areas o Naturally disturbed environments provide impulse for evolution of invasive species o Pampas grass invasion along abandoned fire trail, o Seeds are very small, but many seeds and great dispersal – strategy of invasion Common attributes od successful invasive species - Rapid development to reproduction - High reproductive output - Dispersal mechanisms - Broad ecological tolerance; endangered species are very specialized because of that they are endangered -
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