ENVS 210 1st Edition Lecture 5Outline of Last Lecture II. Ecological organizationa. Biosphereb. Ecosystemc. Communityd. Populatione. OrganismIII. Tropic levelsa. Producersb. Consumersc. Detrivores and decomposersIV. Food webs and energy flowa. Food webb. Food chainV. Keystone speciesa. Removal of sea ottersb. Removal of Yellowstone wolvesOutline of Current Lecture VI. Invasive speciesa. Defining non-native speciesVII. Case study: zebra mussels and their effects in watera. Key invasive speciesCurrent Lecture- Invasive specieso Non-native organisms that spread widely and become dominant in a community Introduced deliberately or accidentally form elsewhere Growth-limiting factors are removed or absent They have major ecological effects Chestnut blight from Asia (early 1900s) wiped out American chestnut treeso Some invasive species help people (i.e. European honeybees)- Case study: black and white spread all overo 1988, zebra mussels were accidentally introduced into lake St. Clair (in great lakes region, connects to Lake Huron and Lake Erie) In discharged ballast water- By 2010, they had invaded 20 statesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Had no natural predators, competitors, or parasites Caused millions of dollars of damage to property each year Microscopic larvae- easy to transporto Eat phytoplankton= cause of loss of fisho Clear water= increase sunlight depth= increase aquatic plantso Shift nutrient balance to the lake bottom= benefit bottom
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