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Environmental Succession The sequential change to an ecosystem Pioneer Species Organisms that move into a environment that has no life Change the environment Allow for other organisms to move in Example Lichens on rock Early successional species Move into the changed environment Are better able to compete than the pioneer species Grow close to the ground Add nutrients to the soil. Grasses and bean plants Midsuccessional Species High grasses or shrubs Must have deep soil Provide shade for late sucessional species Late Successioal Species Relatively stable environments Dominated by Slow growing trees Have high levels of diversity. Oldest are called Terminal forests/Old growth forests Primary Succession Life process begins for the first time – Volcano forming an island Secondary succession The elimination of all life in an area by catastrophe. – Life comes back…. K strategists (kin) Family Polygamy Monogamy -Live longer-prepare off spring for survival -Not every one copulates-very selective Sexual selection-Females look for a trait Learned traits Polygamy-many partners Or Monogamy-one partner R strategists (Rapid) No family-lots of kids….. Nonselective sex Survival is luck More primitive Instinctive Polygamy non selective Shorter lives exc- R strategists (Rapid) No family-lots of kids….. Nonselective sex Survival is luck More primitive Instinctive Polygamy non selective Shorter lives exc-