Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Ecological economics wikipedia , lookup
Renewable resource wikipedia , lookup
Conservation agriculture wikipedia , lookup
Restoration ecology wikipedia , lookup
Theoretical ecology wikipedia , lookup
Biological Dynamics of Forest Fragments Project wikipedia , lookup
Ecological fitting wikipedia , lookup
Ecological Succession Notes Ecological Succession • Ecosystems are constantly changing in response to natural and human disturbances. • As an ecosystem changes, older inhabitants gradually die out and new organisms move in, causing further changes in the community. Definitions • Ecological Succession – a series of predictable changes that occur in a community over time. • Includes - slow changes in the physical environment or sudden natural disturbances from human activities like clearing forests. • Primary Succession – On land, succession that occurs on surfaces where no soil exists. • Colonization of new sites by communities of organisms – takes place on bare rock • Pioneer species – the first species to inhabit an area. • Ex. Lichens are the first to colonize lava rocks Primary Succession – Ex. #1 • When volcanic eruptions build new islands or cover land with lava rock or volcanic ash. Primary Succession – Ex #2 • When bare rock is exposed as glaciers melt. PRIMARY SUCCESSION • Secondary Succession – when a disturbance of some kind changes an existing community without removing the soil – takes place on existing soil. Secondary Succession – Ex. #1 • When land cleared and plowed for farming is abandoned. Secondary Succession – Ex. #2 • When wildfires burn woodlands. SECONDARY SUCCESSION • Climax Community – a mature, stable community that undergoes little or no succession. • Succession Clip and Mt. Saint Helens • http://www.google.com/imgres?imgurl=http://www.darkfaery. com/mount%2520st%2520helen%2520before%2520and%2 520after.jpg&imgrefurl=http://www.darkfaery.com/Mount%25 20St.%2520Helens.htm&usg=__yUnJj8r4wAXfOdGlLLJN7T 8PM6w=&h=664&w=1065&sz=94&hl=en&start=4&itbs=1&tb nid=_tU5P1gCB42ZZM:&tbnh=94&tbnw=150&prev=/images %3Fq%3Dmount%2Bst.%2Bhelens%2Bbefore%2Band%2B after%26hl%3Den%26safe%3Dactive%26gbv%3D2%26tbs %3Disch:1 You tube clip: http://www.youtube.com/watch?v=4-5kJmrLWRQ http://www.youtube.com/watch?v=3eG_O1wEJ40