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Transcript
How Disturbances Can Have Positive and Negative Effects on Communities Positive • Water filtration Negative • Pollution • Oil Spills • Trees being killed Primary and Secondary Succession Comparison Primary Succession Description: The transformation of an ecosystem or community from bare rock to a primary forest. Primary and Secondary Succession Comparison Secondary Succession Description: When an existing community has been cleared by some disturbance. Primary and Secondary Succession Comparison Comparison Between The Two: Primary is the building of a community and secondary succession is when the community is cleared out by a disturbance, not creating a community but killing it off. How Human Activities Affect Species Diversity • Over-exploitation, pollution and habitat conversion are the main threats to species diversity. • They cause a gradual loss of species on local, regional and global levels. • Additionally, the introduction of species into new ecosystems destroys natural balance. • The ever-growing tendencies of tourism, transport, profitoriented food production, and industry enforce these human activities. • Global warming and population growth continually increase these pressures on biodiversity. Bibliography • Pic of oil-covered duck website: http://www.wunderground.com/blog/JeffMasters/c omment.html?entrynum=1483&tstamp=&page=4 &print=1 • Source 1: Biology book in science folder in Novell • Source 2: http://www.biodiversity.ru/coastlearn/bioeng/boxes/specdiv.html