Conservation

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Conservation
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Bioaccumulation Biomagnification

• Bioaccumulation Build-up of substance within body
• Lead in humans
• Calcium from milk to already strong bones
• Biomagnification build up of of substance along
  food chain
• DDT and birds
• Rachel Carlsons Silent Spring

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Build up of DDT along Food Chain Bioaccumulatio
n Biomagnification
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Peregrine falcon
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DDT Residues (ppm wet weight of whole live
organism)
Ring-billed gull fledgling (Larus
delawarensis) Herring gull (Larus
argentatus) Osprey (Pandion haliaetus) Green
heron (Butorides virescens) Atlantic needlefish
(Strongylira marina) Summer flounder
(Paralychthys dentatus) Sheepshead minnow
(Cyprinodon variegatus) Hard clam (Mercenaria
mercenaria) Marsh grass shoots (Spartina
patens) Flying insects (mostly flies) Mud snail
(Nassarius obsoletus) Shrimps (composite of
several samples) Green alga (Cladophora
gracilis) Plankton (mostly zooplankton) Water
75.5 18.5 13.8 3.57 2.07 1.28
0.94 0.42 0.33 0.30 0.26 0.16 0.083 0.040
0.00005
Data for a Long Island, NY estuary in 1967
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Greenhouse Effect
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Greenhouse Effect

• Gasses trap heat in atmosphere
• Carbon dioxide, methane, CFCs
• Anthropogenic use of these gasses is increasing
• Earths temperature appears to be warming
• Hard to measure a world temperature

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Greenhouse Effect
Increased greenhouse gases trap more heat near
Earths surface.
Surface radiates heat. Greenhouse gases absorb
some heat and radiate it back toward Earth.
Suns rays penetrate atmosphere. Enters as light
not as heat. Hitting the earth, light changes to
heat.
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Correlation in changes in atmospheric CO2 with
ice ages and interglacials
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1620
1850
1850 (pocket only)
1990
Extent of deforestation in the United States
Remaining virgin forest
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Satellite image of an iceberg roughly the same
size as Connecticut
Antarctica 2000