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Lecture 5 aquatic environments


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Lecture 5 aquatic environments

  1. 1. Water molecules are polar – one end (hydrogen) is positively charged and the other end (oxygen) is negatively charged.hydrogen bond
  2. 2. Video, Fuel Cell from Humboldt State University in Northern California:
  3. 3. Standing water ecosystem – a body of fresh water surrounded by land and whose water does not flow (e.g., a lake or a pond). Three zones 1. Littoral – shallow water near shore 2. Limnetic – open water as far down as sunlight penetrates to permit photosynthesis. 3. Profundal – deep water where sunlight does not penetrate; bacteria andBear Lake decomposers.Rocky Mountain National Park
  4. 4. Nova Video, Arctic dinosaurs and secrets in leaves:
  5. 5. Flowing water ecosystem – water flows in a current (i.e., river, stream).
  6. 6. Columbia River Basin
  7. 7. The Columbia RiverDrainage basinIndigenous peoples
  8. 8. Columbia RiverHydroelectricityFishing
  9. 9. Columbia River1.National Security & Pollution2.Nature3.Agriculture
  10. 10. Alpine Glacier Melt in Austria:
  11. 11. Freshwater wetlands – land that freshwater covers for at least part of a year.These biomes have characteristic soil and water-tolerant vegetation.1. Soils are water logged and anaerobic (no oxygen) for long periods of time. Rich in accumulated organic material.2. Excellent habitat for migratory waterfowl and birds.3. Can trap and hold pollutants in flooded soil, cleansing and purifying water.
  12. 12. Estuaries – coastal body of water partly surrounded by land with access to open ocean and a large supply of fresh water from a river. 1.Water levels rise and fall with tides. 2.Salinity fluctuates from fresh to brackish (somewhat salty) to salt ocean water at the mouth of the estuary. 3.Salt marshes – temperate estuary.Mangrove forests/swamps 4.Mangrove forest – tropical estuary.
  13. 13. NYTimesThe Science of the SpillA year after BP Oil Spill, a search for its impact
  14. 14. mixed population bacteriaNatural selection – thetendency of those individualsthat are better adapted to antibioticenvironmental conditions to ampicillinsurvive, reproduce, andincrease their proportion inthe population.First proposed by AlfredWallace “On the Tendency of ampicillinSpecies to form Varieties” in resistant bacteria1858 and Charles Darwin“On the Origin of Species” in1859.
  15. 15. Evolution of the PepperedMoth by Natural SelectionRural England moths were lightand peppered effectivelycamouflaging them with lichensand trees.Urban England soot coveredmuch of landscape and lightcolored moths die off frompredation. Black mothsflourished.