Disturbances Are Common In Communities By: Gary Bahling, Eli Samuel, & Emily Ziesmer

How Disturbances Can Have Positive and Negative Effects on Communities 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, profit-oriented 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/comment.html?entrynum=1483&tstamp=&page=4&print=1 Source 1: Biology book in science folder in Novell Source 2: http://www.biodiversity.ru/coastlearn/bio-eng/boxes/specdiv.html