LAKES Flashcards
Its difference from oceans is it is smaller in sizes and has relative isolation
Lakes
They are a _____ in the landscape that collect water
Topographical depression
Where most of the worlds freshwater resides
The Great Lakes
Approximately 20% of all freshwater in the planet
The Great Lakes of North America
An additional 20% of freshwater are contained here
Lake Baikal
Deepest lake, has ____ m
Lake Baikal,
1600 m
Its remainder is contained in rift lakes of East Africa
Lake Tanganyika
Second deepest lake, has ____m
Lake Tanganyika, 1470 m
Where smaller, shallower lakes are concentrated
Lake Districts
Lake District examples
Northern Minisota,
Scandinavia
Shallowest water, where rooted aquatic plants may grow
Littoral Zone
Beyond the littoral Zone
Limnetic zone
Encompasses a surface layer of lakes
Epilimnion
Below the epilimnion
Thermocline (metalimnion)
Below the thermocline. Waters are cold and dark
Hypolimnion
Influence by many factors especially lake chemistry and biological activity
Lake Color
Lakes become _____ as they heat
Thermally stratified
Stratified during summer
Temperate lakes
Stratified all year round
Tropical lakes
Breaks down in temperate lakes as they cool during fall
Thermal Stratification
Limit wind-driven mixing
Summer
Stratification breaks down and wind driven vertical currents mis temperate lakes from top to bottom.
Spring and fall
Ice forms a surface barrier that prevents mixing
Winter
Much more variable than that of the open ocean
Lake Salinity
Salinity of over 200%
Great Salt Lake
Well -mixed lakes of low biological production. Nearly always well-oxygenated
Oligotrophic
High biological production. Depletion of oxygen
Eutrophic
Nutrient enrichment as a consequence of human activities can accelerate the process. Generally resulting in increased primary production
Eutrophication
Increased production of algal blooms, oxygen depletion , and reduce biodiversity
Eutrophication
3 African lakes
- Lake Victoria
- Lake Tanganyika
- Lake Malawi
- Lake Victoria
- Lake Tanganyika
- Lake Malawi
Contains
700 species of fish
Human Influence
- Centers Human Population
- Dumping of nutrients
- Lake Erie
- Introduced Species
One of the most altered Great Lakes
Lake Erie
Flows before reaching lake. Fouled with oil and catch fire.
Cuyahoga River
Flows before reaching lake. Fouled with oil and catch fire.
Cuyahoga River
Healthy lake that turns into an algal soup
Lake Erie