Lakes Flashcards
Is Lake a lentic System or Lotic ecosystem?
Lentic ecosystem
What is a compensation depth?
The depth at which photosynthesis production = energy used up by respiration
What is the name of lake zone near to the coast of lake
Littoral zone
What is the name of the lower water zone of lake?
Profundal zone
What is the name of the surface water zone of lake?
Limnetic zone
What types of plant can be found in the littoral zone?
rooted (Emergent, subemergent) and floating plant
What is the adaptation of floating plant in littoral zone?
Highly developed aerating system (aerenchyma 通氣組織); direct gaseous exchange through leaves; absence of cuticles
What is the adaptation of fish in littoral zone?
Lack of strong laterial muscles for swimming in swift water
Who contributes to the primary production of littorial zone?
Rooted plant and phytoplankton
In large lakes, Phytoplankton produce more total biomass than rooted plants in littoral zone.
True
Oxygen is abundant in profundal zone.
False
Green Plants are absent in profundal zone.
True
What is the type of species that can found in profundal zone?
Bacterial, fungi (decomposers), fish, cladocerans
What is the name of bottom layer zone of lake?
Benthic zone
What is the type of species that can found in benthic zone?
Anaerobic bacteria, periphyton
Eutrophic lakes have a higher turbidity
True
Oligotrophic lakes have higher levels of oxygens
True
Eutrophic lakes carries low level of phosphates and nitrates
False
Oligotrophic lakes have higher levels of blue green algae
True
Eutrophication is a natural process
True
Freshwater system is mostly limited by:
A. nitrogen
B. phosphorus
C. ammonium
D. potassium
B. phosphorus
The decline of Oxygen level in oligotrophic lakes down the bottom is larger than that of eutrophic lakes.
False
Cultural eutrophication is characterized by a bloom of blue-green algae.
True
Human accelerated the eutrophication process.
True
Temperature in lakes fluctuate in a daily basis.
False
Which of the following statements regarding to the relationship between O2 Solubility and other physical parameter is correct?
(1) When temperature increases, O2 solubility decreases
(2) When pressure decrease, solubility of O2 increase
(3) When Salinity increase, solubility of O2 increase
(1) only
Large amount of O2 has been used up in lakes in winter
False
Oxygen stratification in lake starts in
Summer
Temperature stratification in lake starts in
Winter
In Autumn, lake water losses heat through
Convection, conduction, radiation
The process of water circulation with the replenishment of oxygen and nutrient in Spring and Autumn is called
Overturn
What is the 3 stratification layers in lake water?
Epilimnion (highest O2, △Temp < 1℃/-1m);
Metalimnion (thermocline, △Temp > 1℃/-1m);
Hypolimnion (bottom, △Temp < 1℃/-1m)
Oxygen is the most important limiting factor in lentic ecosystems
True
The most limiting nutrient in marine ecosystem are
A. nitrogen
B. potassium
C. phosphorus
D. carbon
A. nitrogen
