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How Changes Occur Naturally in EcoSystems

Riley Bellerose, Bethany Phillips, Ty Carson

Riley Bellerose

on 4 June 2013

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Transcript of How Changes Occur Naturally in EcoSystems

How do organisms adapt to change? Ecosystems change over time Natural Events Examples of Natural Events Secondary Succession Natural Selection: The Process that makes change possible in living things. Ecological Success refers to changes that take place over time in the types of organisms that live in an area. There are two types of Ecological Succession. Section 3.1: How Changes Occur Naturally in Ecosystems Natural events can destroy habitats, reduce biodiversity, and cause regions to undergo succession. A) Flooding. Flooding results in soil erosion, pollution, and disease when toxins or harmful bacteria from untreated sewage enter drinking water. D)Tsunamis. Huge, rapidly moving ocean waves destroy habitats and salt water carried onto shore changes soil composition. Riley Bellerose, Bethany Phillips, Ty Carson Adaptive Radiation In Natural Selection, the best adapted members of species survive to reproduce. These individuals may pass favourable characteristics to their offspring. As a biotic and biotic components of their environment change, Adaptive Radiation may result. This term describes the change from a common ancestor into a number of different species that radiate out to inhabit different niches. Primary Succession: Primary Succession occurs in areas where no soil exists, such as following glaciation or a lava flow. Wind and rain carry spores of lichens to those areas. Lichens obtain nutrients by secreting chemicals that break down rock. As Lichens decay, they add organic matter to the developing soil. A Diagram of Primary Succession Small disturbances, such a fire, often occur in ecosystems. Secondary succession—succession that occurs as a result of a disturbance to an ecosystem that already has soil and was once the home of living organisms- occurs as a result. It proceeds much faster than primary succession since micro-organisms, insects, and nutrients still exist in the soil B) Drought. Plants and Animals die from lack of water. C)Insect Infestations. Infestations often result in succession of forests because insects destroy weaker, older trees.
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