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Ch 55 ecosystems
- 1. Ch 55 Ecosystems Jeff Jewett ACS June 2010 Ver 1
- 11. Global NPP, 2008 NASA Earth Observatory: http://earthobservatory.nasa.gov/IOTD/view.php?id=38889
- 21. Biomass Pyramid Why do some people eat a vegetarian diet for environmental reasons? http://earth.rice.edu/MTPE/bio/biosphere/topics/energy/biomass_pyramid.gif
- 25. Harmful Algal Bloom (“Red Tide”) Photo credit: NOAA: http://www.noaanews.noaa.gov/stories2009/20090520_ecosystems.html
- 26. Eutrophication: Spring phytoplankton bloom off New Zealand Photo courtesy NASA Earth Observatory
- 27. Eutrophication Lake Valencia, Venezuala NASA Earth Observatory: http://earthobservatory.nasa.gov/IOTD/view.php?id=5001
- 30. Fish Kill at the Salton Sea, CA Image from Encyclopedia of Earth: http://www.eoearth.org/image/SaltonSeaFishKill.jpg
- 34. Great Lakes Biomagnification Peak water PCB concentation in 1994: 0.00000036 ppm Bioaccumulation of 69,000 X Herring Gulls have 3.4 MILLION times more PCB than the water!
- 36. Atmospheric (Stratospheric) Ozone Depletion
Notas del editor
- Every day the earth is bombarded by 10^22 J of solar light
- GPP is often about ½ of GPP
- Primary producers only about 1% efficient
- Anything that is taken into the body faster than it breaks down / gets expelled will accumulate. Some things are never expelled. Bioaccumulation occurs within a trophic level. Environmental persistence (does not break down) helps substance accumulate. Persistant Organic Pollutants (POPs) – we lack the enzymes to break them down, as they are relatively new to the world. Metals cannot degrade (they are elements) Eagles have recovered after the ban of DDT usage. Common in aquatic food chains (direct absorption). Algae absorb mercury (Methyl Mercury), only excrete slowly.
- PCBs were used commercially since 1929 as coolants and lubricants, banned in 1976 in USA Lake Trout were as high as 24 ppm in the 1970s Water in 1994 ranged from 0 – 0.36 parts per trillion (0.000000 36 ppm) Source: http://epa.gov/med/grosseile_site/LMMBP/LMMBP_PCB.pdf
- Halocarbons are also about 14% of the greenhouse gas warming effect (radiative forcing) CFCs last 50+ years in atm Skin cancer, plant DNA damage Montreal Protocol : 190 nations in 1987 regulate these gases Ozone depletion has stabilized Expected to be at pre-1980 levels by 2075!