GEOG 108 Lecture 33.docx

GEOG 108 Lecture 33.docx - GEOG 108 – Species Extinction...

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GEOG 108 – Nov 30, 2018 - Species Extinction Crisis o Human activity is causing the sixth mass extinction event o Current extinction rate is about 1000x greater than background extinction rate o Unlike past mass extinctions, this one is being caused by the activities of humans o Humans can reduce the magnitude of this event o Extinction crisis – when did it begin? o From 1500-1900AD the extinctions have mainly occurred on islands o Species involved were highly endemic to their island homes o Example – Hawaii lose 23 species of birds o Over the last 100 years, the geography of the extinctions changed and are now found on continents – still mainly endemic species involved o Not one factor is responsible for the extinction of species o Some of the factors that will be described may act alone or they can act together with other factors o Knowing why species are disappearing is an important prerequisite to developing conservation strategies - Poaching, hunting and harvesting o Many species have died out because of legal or illegal hunting o Three general types of hunting Subsistence hunting – killing animals for food Sport hunting – killing animals for recreation
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o Commercial hunting – hunting for profit o Poaching is the illegal hunting of wildlife protected by law o Harvesting – capture of large number of individuals from a plant or animal species for the purpose of food consumption or making commercial products o Over-harvesting is the removal of individuals from a population faster than they are replaced by reproduction
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- Species introductions o Introduction of an invasive species ( alien species
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