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Quiz 2 Review PowerPoint

Quiz 2 Review PowerPoint. Population dynamics. EXPONENTIAL GROWTH. BIRTH RATE >DEATH RATE POPULATION STARTS OUT SLOWLY THEN INCREASES RAPIDLY J-SHAPED CURVE CANNOT KEEP GROWING LIKE THIS DUE TO LACK OF RESOURCES. LOGISTIC GROWTH.

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Quiz 2 Review PowerPoint

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  1. Quiz 2 Review PowerPoint

  2. Population dynamics

  3. EXPONENTIALGROWTH • BIRTH RATE >DEATH RATE • POPULATION STARTS OUT SLOWLY THEN INCREASES RAPIDLY • J-SHAPED CURVE • CANNOT KEEP GROWING LIKE THIS DUE TO LACK OF RESOURCES

  4. LOGISTIC GROWTH • POPULATION GROWTH BEGINS FAST BUT LEVELS OFF WHEN RESOURCES (food, space, air, etc.) ARE USED UP & CARRYINGCAPACITY IS REACHED • CARRYING CAPACITY = # OF ORGANISMS ECOSYSTEM CAN SUPPORT • S-SHAPED CURVE

  5. At what level do the deer reach the CARRYING CAPACITY of this island? Carrying capacity is around 80 deer – the number at which it levels out.

  6. Quadrat Sampling • Scientists use a quadrat (a set measuring area) to sample organisms in a large area. • This method is best used for organisms that experience little to no movement.

  7. Suppose the following field is divided into 10 cm x 10 cm quadrats. 1) What would be the DENSITY of Buttercups in quadrat B? 2) What would be the DENSITY of Dandelions using ALL selected quadrats (A-E)? 3) Using this DENSITY, how many Dandelions would you predict are in the whole field?

  8. Suppose the following field is divided into 10 cm x 10 cm quadrats. 1) What would be the DENSITY of Buttercups in quadrat B? • Density = # organisms/Area • # buttercups in quadrat B = 2 • Area of quadrat B = 10cmX10cm = 100cm2 • Density = 2/100 cm2 or reduced to 1/50 cm2

  9. Suppose the following field is divided into 10 cm x 10 cm quadrats. 2) What would be the DENSITY of Dandelions using ALL selected quadrats (A-E)? • Density = # organisms/Area • # dandelions = 8 • Area of quadrat A-E = 100cm2 x 5 = 500 cm2 • Density = 8/500 cm2 or reduced to 2/125 cm2

  10. 3. Using this density, how many dandelions are in the entire field? • You must first determine the area of all quadrats • = 100 cm2 X 25 quadrats = 2500cm 2 • Then create a proportion with the density you determined from the previous question. • 2 x __________ = ___________ • 125cm2 2500cm 2 • X= 40

  11. Mark and Recapture Scientists capture, mark, and release a certain number of individuals in a species. Some time later, they recapture organisms of the same species. Using a formula that compares the number of recaptured animals that were marked to those that are not provides an estimate of the population size. This method is best used when sampling animals that move, are relatively easy to capture, don’t molt or shed frequently, and don’t experience excessive immigration or emigration.

  12. Mutualism (+/+) Both organisms benefit

  13. (+/-)

  14. Commensalism (+/0)One organism benefits while the other is unaffected

  15. BIOMES - Major ecosystems that occur over large areas of Earth with similar biotic and abiotic factors and:

  16. TROPICAL RAINFOREST(THINK JUNGLE)

  17. TEMPERATEDECIDUOUS FOREST

  18. TAIGA– Northern coniferous (Boreal) forest – (think Christmas trees)

  19. Tropical Savanna

  20. Temperate Grassland(Think “bread basket of U.S.)

  21. Desert

  22. TUNDRA“Think ARCTIC DESERT”

  23. KEYSTONE SPECIES • A species vital to the success of the ecosystem

  24. GOPHER TORTOISE

  25. SUCCESSION • Change in an ecosystem over time

  26. Climax Community • A mature, stable ecosystem that will change very little • Lots of biodiversity (different species of organisms)

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