endangered species

• what is meant by an endangered species


  those at serious risk of extinction
• what is meant by extinction


  this is when there are no living members of a species left
• list 9 reasons that increase the rate of extinction

  natural selection, not continuous populations, loss of habitat, drainage of wetlands, hedgerow loss, crop sowing seasons, overhunting, competition and pollution
• what is meant by a non continuous population


  small populations are isolated from each other and are unable to interbreed decreasing their genetic diversity make them less likely to survive environmental change
• what is meant by a loss of habitat and how does it lead to the extinction of species


  this is the permanent removal of habitats so species must find a new place to live if they survive the destruction of their old habitat
• give her example of a species that is endangered due to natural selection


  the Yangtze River dolphins
• give an example of a species that is endangered due to non continuous populations


  the west African black rhinos
• give examples of a species that is endangered due to a loss of habitat


  the javan tiger
• what is meant by a drainage of Wetlands and how is it lead to the extinction of species


  this is when wet lands are removed to allow agriculture or buildings. this will lead to species being deprived of habitats and food
• what species is now extinct due to the loss of habitat and a drainage of Wetlands


  the large copper butterfly
• what is meant by the removal of hedgerows


  this is the removal of breeding sites feeding sites and wildlife corridors which allow animals to move from one area to another
• what is an example of an endangered species due to the removal of a hedgerow


  the dormouse
• what is meant by crop sowing seasons


  this is when sowing occurs during Autumn rather than spring which means plants are unable to reach heights for birds to build nests
• what a two species are endangered due to crop sowing seasons changing


  lapwing and skylark
• what is overhunting


  this is where many of one species is being used at one making it harder for them to continue the population
• give examples of why overhunting takes place


  competition for trophies traditional medicine and agriculture exploitation
• give an example of a animal that is now extinct due to over hunting


  white rhinos
• what is meant by competition from introduced species


  this is what animals are accidentally introduced to other animals
• give an example of an animal that is now extinct due to competition from an introduced species


  the dodo bird
• what is pollution


  the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
• give an example of a type of pollution

  oil spills