Presentation on theme: "Limnology 101 Dan Obrecht MU Limnology"— Presentation transcript:
1 Limnology 101 Dan Obrecht MU Limnology email@example.com The Missouri Department of Natural ResourcesUniversity of Missouri-ColumbiaRegion VII, US Environmental Protection Agency, through the Missouri Department of Natural Resources, has provided partial funding for this project under Section 319 of the Clean Water Act
2 Limnology is the science dealing with the physical, chemical, biological and meteorological study of inland waters.
10 Residence Time Glaciated Lakes = Moderate to high residence times Reservoirs = Generally low to moderate residence timesOxbows = Varies with connectivity to river, generally low due to low volumes
11 Why is Residence Time important? Residence time can be used to gauge inputs relative to lake volume. A lake with a long residence time has low inputs, while a lake with a short residence time has greater inputs relative to lake volume.
12 Residence time also indicates how much sedimentation can occur Residence time also indicates how much sedimentation can occur. A long residence time translates to more material settling out to the bottom of the lake. A short residence time means this sedimentation does not occur.
13 LifespanOver time, lakes become shallower as organic and inorganic matter settles to the bottom. As the lake becomes shallower, it also becomes more productive; accelerating the rate of sedimentation. At some point the lake becomes a wetland.
14 Lifespan Glaciated Lakes = High lifespan Reservoirs = Short to moderate lifespanOxbow = Short lifespan
29 Trophic State Classification Oligotrophic = low nutrients, low algal biomass, high clarity, dissolved oxygen throughout water columnMesotrophic = moderate nutrients and algal biomass, some clarity
30 Trophic State Classification Eutrophic = rich in nutrients and algal biomass, turbid, loss of dissolved oxygen in lower layer during summer stratificationHypereutrophic = very nutrient rich, algal biomass levels that have a negative impact on lake use
31 Eutrophication: The process of lake aging, in which productivity increases overtime as the lake becomes shallower.