Water Management

Question 1

two main factors that set the limits on how much oxygen can be “held” by a freshwater lake

Answer 1

temperature and altitude.

Question 2

How does temperature affect the amount of oxygen in water?

Answer 2

warm water holds less oxygen than cool water

Question 3

as altitude increases, the

amount of oxygen in a lake

Answer 3

decreases

Question 4

all aquatic organisms
use dissolved oxygen gas (O2
) that is constantly
entering water from two main sources:

Answer 4

atmosphere and from photosynthesis

Question 5

Oxygen from the atmosphere continuously
enters the surface of a waterbody through a
process known as

Answer 5

diffusion.

Question 6

In most freshwater environments, DO (Disolved Oxygen) measurements usually range somewhere between

Answer 6

six and ten milligrams per liter

Question 7

fish and other aquatic life will
begin to experience stress when
measurements drop down to

Answer 7

three or four milligrams per liter

Question 8

Few organisms are
able to survive in water when dissolved oxygen
levels are below

Answer 8

2 milligrams per liter

Question 9

water described as having a dissolved

oxygen saturation of greater than 100 percent

Answer 9

supersaturated

Question 10

Dissolved oxygen

Answer 10

is the amount of oxygen
measured in water, in milligrams per liter
(mg/L).

Question 11

Oxygen saturation

Answer 11

is the potential that a
waterbody has for holding oxygen, based
primarily on water temperature and altitude.

Question 12

______ is the ratio
between actual dissolved oxygen measurements and the water’s potential for holding
oxygen

Answer 12

Percent oxygen saturation

Question 13

Using a nomogram,4
one can use both
the temperature of the water and dissolved
oxygen measurements to determine

Answer 13

what the
percent oxygen saturation should be at any
given time.

Question 14

the main

influencing factors on water temperature

Answer 14

Energy from the sun and the temperature of the

air surrounding a lake or waterbody

Question 15

_______determine the influence that air temperature will have on a lake

Answer 15

The size of a water-body and the volume of water

Question 16

Other Factors Influencing Water Temperature

Answer 16

inflows and outflows, lake

morphometry, wind, waves and lake color

Question 17

the smallest density difference for

one degree of change of water occurs at

Answer 17

4 degrees Celsius

Question 18

as the difference in density

increases, so does the amount of

Answer 18

energy required

to mix the two layers of water

Question 19

Lakes that mix only once a year are often

referred to as

Answer 19

monomictic.

Question 20

lakes
that mix once a year, during the coldest part of
the year, are referred to as

Answer 20

cold monomictic

Question 21

Shallow lakes, like many of the waterbodies

found in Florida, are considered to be

Answer 21

polymictic

Question 22

Lakes with low productivity (i.e., the amount of algae, aquatic plants, fish and
wildlife) tend to

Answer 22

experience small changes in oxygen concentrations,

over a 24-hour period

Question 23

Large inputs of dissolved and particulate

organic matter can

Answer 23

reduce oxygen concentrations

in lakes

Question 24

Water temperature “drives” several important

life processes for fish including their

Answer 24

metabolic

rate, growth rate, and reproduction