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Topic: Oxygen depletion

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	Great Lakes Water - Oxygen Depletion
		The similarity in the rate of oxygen depletion between 1993 and 1997 is reflected in the pattern of oxygen concentrations among the stations.
		Variability in the rate of dissolved oxygen depletion, its severity, and its duration are related to year-to-year differences in the thickness and temperature of the bottom water layer in the Central Basin of Lake Erie.
		The depletion rates for 2003 and 2004, however, were again near the average from the years 1990 – 2004, and they were was not consistent with the long term trend observed from 1970 – 1989.
	www.epa.gov /glnpo/glindicators/water/oxygenb.html (2409 words)

	Dissolved Oxygen
		Oxygen depletions are the most common cause of fish kills in ponds.
		Most oxygen deletions occur in the summer months because 1) warm water holds less dissolved oxygen than cool or cold water, and 2) because the pond's oxygen demand is greater in warm water than in cold water.
		Plankton die-offs cause rapid oxygen depletions for two reasons: 1) the remaining dissolved oxygen is consumed by aerobic bacteria and fungi in the process of decaying the dead algae and 2) few live phytoplankton remain to produce more oxygen.
	aquaplant.tamu.edu /contents/dissolved_oxygen.htm (1112 words)

	HELCOM (Site not responding. Last check: 2007-11-03)
		Oxygen depletion in the deep basins of the Baltic Sea is a natural problem due to limited water exchange between the Baltic and North Seas, the large input of freshwater run-off into the Baltic Sea and salinity differences preventing deeper waters from mixing with oxygen-rich surface waters.
		Oxygen depletion is widely used as an indicator for the indirect effects of nutrient enrichment.
		Lowest oxygen levels are experienced at the end of summer, between August and October, when detritus from biological activity in the surface waters has sunk, and is decomposed by bacteria.
	www.helcom.fi /environment/assessment/en_GB/oxygendepletion (386 words)

	Oxygen depletion results in ‘summerkill’ (Site not responding. Last check: 2007-11-03)
		Instead of an oxygen concentration between 4 and 10 parts per million (ppm), the amount of oxygen dissolved in the water is less than 2 ppm and perhaps less than 1 ppm.
		If you discover the oxygen depletion as it happens, you would see fish swimming head up at the water surface, opening and closing their mouths.
		It is possible for the oxygen depletion to return each night for several nights until the pond becomes stable again.
	www.wvu.edu /~agexten/aquaculture/summerki.htm (938 words)

	Hypoxia (environmental) - Wikipedia, the free encyclopedia
		Hypoxia or oxygen depletion is a phenomenon that occurs in aquatic environments as dissolved oxygen (DO; molecular oxygen dissolved in the water) becomes reduced in concentration to a point detrimental to aquatic organisms living in the system.
		Dissolved oxygen is typically expressed as a percentage of the oxygen that would dissolve in the water at the prevailing temperature and salinity (both of which affect the solubility of oxygen in water; see oxygen saturation and underwater).
		Oxygen depletion could be the result of a number of factors including natural ones, but is of most concern as a consequence of pollution and as an outcome of a process known as eutrophication.
	en.wikipedia.org /wiki/Oxygen_depletion (741 words)

	Dissolved Oxygen for Fish Production (Site not responding. Last check: 2007-11-03)
		However, fish are able to absorb oxygen directly from the water into their bloodstream using gills, whereas land animals use lungs to absorb oxygen from the atmosphere.
		Oxygen, derived from photosynthesis, is produced during the day when sunlight shines on the plants in the water.
		An oxygen depletion event severe enough to result in significant fish mortality is often observed in water with heavy populations of algae or aquatic plants.
	edis.ifas.ufl.edu /BODY_FA002 (1645 words)

	Lake Erie LaMP Tracking Depletion of Dissolved Oxygen - Binational Site
		This oxygen depletion was so severe in the central basin of Lake Erie by the end of the 1960's that large numbers of fish, starved for oxygen, were dying and washing ashore along with heavy mats of decaying, floating algae.
		In contrast, the deeper eastern basin is not threatened by oxygen depletion because decomposition of algae and sediments cannot deplete the much greater water volume in its hypolimnion over the span of the spring and summer.
		The thermal and oxygen profiles are determined using a side-cast instrument array, and samples are taken to verify the instrument readings.
	www.epa.gov /glnpo/lakeerie/dostory.html (804 words)

	Oxygen Depletion in Ponds
		Severe environmental stressors are the most frequent causes of sudden fish death in garden ponds or other fish habitats, and the lack of oxygen in the water is the number 1 stressor of all.
		If algae are profusely blooming, the plants deplete all the pond’s oxygen during the night, which in turn, causes fish inhabiting the pond to die.
		Fish have been observed gulping for oxygen at the water’s surface in sixty minutes or less from the onset of sudden algae death.
	www.taoherbfarm.com /herbs/resources/pondoxygen.htm (553 words)

	LOW OXYGEN AND POND AERATION
		In a natural setting, oxygen is added to water by atmospheric diffusion at the surface, by wind circulation (augmented surface diffusion) and by photosynthesis (oxygen produced by phytoplankton or algae).
		A number of conditions may develop which result in oxygen depletion, DO at levels insufficient (less than 3 mg/l) to support aquatic life (e.g.
		The cool water near the bottom becomes stagnant; oxygen is depleted and toxic compounds may be produced by bacteria and decaying organic matter.
	www.ca.uky.edu /wkrec/LowOxygenandPondAeration.htm (1246 words)

	Oxygen depletion
		The phase at the beginning of exercise where respiration does not match the workload is called oxygen deficit.
		To preserve and maintain health, they need to recover the oxygen depleted during such rigorous training.
		Oxygen intake is so important, an Asian doctor had the idea of the invention of a machine that stimulates the spine like goldfish when they swim in water.
	www.suite101.com /article.cfm/aerobics/96651 (518 words)

	Oxygen Depletion Facts - Stunning (Site not responding. Last check: 2007-11-03)
		The hydrogen combines with oxygen to form water (H2O), and carbon combines with oxygen to form carbon dioxide (CO2).
		A carbon atom has a weight of 12, and each oxygen atom has a weight of 16, giving each single molecule of CO2 an atomic weight of 44 (12 from carbon and 32 from oxygen).
		Therefore, to calculate the amount of CO2 produced from a gallon of gasoline, the weight of the carbon in the gasoline is multiplied by 44/12 or 3.7.
	www.rense.com /general73/poxy.htm (835 words)

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