Chapter 52: Ecology and the BiosphereWeek 13, Session 2Supplemental InstructionIowa State UniversityLeader: KelseyCourse: Bio 211 (5)Instructor: Dr. HolscherDate: 11-19-091. What is responsible for the changing seasons? (You don’t need to be too scientific. )the earth is tilted on its axis (therefore, when the northern hemisphere is leaning toward the sun, the southern hemisphere is facing away, and this changes as earth makes its rotation)2. What effect do oceans and large lakes have on the climate of land nearby? they help moderate the climate of surrounding land 3. What effect do mountains have on climate? mountains affect sunlight, local temperature, and rainfall 4. What is the largest biome? oceanic pelagic 5. Label the zones in lakes and oceans: Supplemental Instruction1060 Hixson-Lied Student Success Center v 294-6624 v www.si.iastate.edu6. When does seasonal turnover in lakes occur? spring and autumn 7. Oligotrophic lakes are nutrient __poor_________ and oxygen __rich________. 8. Eutrophic lakes are nutrient __rich__________ and oxygen __poor_________. 9. Fill in the important details about the following aquatic biomes: WetlandsLow in dissolved oxygen, excellent filtrationMarine BenthicFound at seafloor, receives no sunlightStreams and RiversHave currents, are stratified, oxygen-rich headwaters Coral ReefsFound in marine photic zones, require high oxygen levels EstuariesSalinity varies, “transition areas” (between salt and freshwater)Oceanic PelagicLargest biome, covers 70-75% of earth, high oxygen levels and low nutrient levelsIntertidal ZonesPeriodically underwater, oxygen rich and high in nutrients 10. What are the largest factors in defining terrestrial biomes? climate, vegetation, stratification11. What two things are considered on a climograph?temperature and precipitation12. Fill in the important details about the following terrestrial biomes: Tropical ForestLittle variation in temperature, stratified and competition for light DesertLow precipitation, varying temperatures, sparse vegetation, nocturnal animals SavannaWarm year round, seasonal rainfall, fire is common ChaparralRainy winters, long dry summers, widely spread outTemperate GrasslandDry cold winters, wet hot summers Coniferous ForestWinters cold and long, summers hotBroadleaf ForestLots of precipitation, hot and humid summers, deciduous trees dominateHave a fantastic break!!!!!!! Don’t forget to fill out an SI survey on our SI course
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