Lakes Exam two

What is an example of a river that forms an oxbow lake?

Itkillik River, Alaska

What is an example of a sinkhole lake?

Devil’s Hole Sinkhole, Florida

How are sinkhole lakes created?

Cause of subsidence

How are reservoirs formed?

By humans usually constructed with a dam

What are functions of reservoirs?

Water storage, flood control, and recreation

Lakes that have inflow and outflow are _____?

Drainage Lakes

Lakes that have inflow and no outflow are _____?

Seepage lakes

How do seepage lakes loose water?

Evaporation, groundwater seepage, or transpiration

What is an example of a Seepage lake?

English Lake, WIsconsin

What is an example of a Drainage lake?

Lake Tahoe

Trophic Status

Measure of a lakes productivity

Eutrophic lakes

Nutrient rich lakes

Oligotrophic lakes

Nutrient poor lakes

Mesotrophic lakes

In between eutrophic and oligotrophic

Lake Merced is ___

Eutrophic lake; High algal production and decomposes organic debris

Crater lake is ____

Oligotrophic Lake; Few small fish and low vegeration density

What are the two most important nutrients for water quality?

Nitrogen and Phosphorus

What is Eutrophication?

Plant and algae growth and decay which consumes DO

Why is Eutrophication bad?

Lack of DO for fish and aquatic plants and blocks sunlight and prevents photosynthesis

What accelerates Eutrophication?

Excessive N & P which over stimulate aquatic plant growth and death

What causes lakes to form from glacial activity?

Glacial melt water forms lakes

Example of glacial formed lake?

Columbia icefield Athabasca Glacier

Proglacial lake

formed by the damming action of moraine or ice during the retreat of a melting glacier

Example of Proglacial lake

Schoolroom Glacier, Wyoming

Example of Proglacial Lake in California

Palisade Glacier, Central Sierra Nevada

What causes lakes to form from Volcanic acticity?

Volcano calderas rims that form from the volcano collapse and get filled with rainwater

What is an example of volcanic activity lake?

Crater lake, Oregon

How are Lakes formed by Tectonic activity?

movement of the earths crust creates rift (fissures in rocks) that fill up with water

Example of a Tectonic lake

Lake Baikal, Serbia

Epilimnion layer

Warm top layer; light penetrates, plants and phytoplankton thrive

Metalimnion (sometimes called thermocline)

Transition layer; temperature varies with depth

Why is Metalimnion sometimes called Thermocline

it varies with temperature, DO, and biological activity

Hypolimnion

Cold deep layer: sometimes anoxic, no light, and low biological activity

What is lake turnover?

Mixing of lake water layers

When does lake turnover happen?

Fall & Spring

Why is Lake turnover important?

Redistributes oxygen and nutrients and supports aquatic life

Spring turn over

(warming of water )mixes so temperatures even out spreading oxygen and nutrients

Fall turnover

(Cooling of water) causes lake to mix again

Why does wind have the ability to mix the water?

There is no density difference to overcome

How was Mono lake formed?

Tectonic processes land dropped along faults

What type of lake is Mono lake?

Seepage lake