Intro to Limnology

Question 1

Limnology

Answer 1

The study of freshwater

Question 2

Lentic

Answer 2

Non-flowing bodies of water

Question 3

Lotic

Answer 3

Flowing bodies of water

Question 4

Ephemeral Ponds

Answer 4

Short living bodies of water.

Pools, pans, playas

Question 5

Lake

Answer 5

Relatively large and deep with stratification

Question 6

Pond

Answer 6

Small, shallow, entire depth mixes

Question 7

Reservoir

Answer 7

Man made dam to trap water

Question 8

Wetland

Answer 8

Shallow, saturated soil, characterized by specific vegetation

Question 9

Swamp

Answer 9

A wetland with trees

Question 10

Rock pool

Answer 10

Shallow depression in rock,

Question 11

Tree hole

Answer 11

Pools of water in openings of tree

Question 12

Bog

Answer 12

Small acidic lake with accumulated organic matter (peat) and floating vegetation mat

Question 13

Salterns

Answer 13

Pounds used for salt production

Question 14

Rivers and streams

Answer 14

creek, crick, brook…, Moving water with pools runs and riffles

Question 15

Springs

Answer 15

A depression with a flow from underground

Question 16

Seeps

Answer 16

like a spring, but without an obvious single source

Question 17

Cave pools and streams

Answer 17

in limestone caves

Question 18

Intermittent streams

Answer 18

Flow only part of the year

Question 19

Canal

Answer 19

Manmade waterway connecting natural streams and/or lakes

Question 20

Backwater

Answer 20

Still water in a river flood plain, not necessarily connected to flow of river

Question 21

Estuary

Answer 21

Brackish wetland influenced by a river and the sea

Question 22

Thermal Stratification

Answer 22

The temperature-density relationship of water

Question 23

Isothermal

Answer 23

Same temperature from top to bottom

Question 24

Epilimnion

Answer 24

Upper, less dense layer

Question 25

Metalimnion

Answer 25

Middle, transition layer

Question 26

Hypolimnion

Answer 26

Lower, most dense layer

Question 27

Thermocline

Answer 27

Most rapid change in temperature

Question 28

Thermal Stratification Varies

Answer 28

Time of year, lake depth, wind fetch, topography (structure of land around shore), and solutes

Question 29

Monomictic Lakes

Answer 29

Stratify once a year

Cool and mix to become isothermal

Question 30

Dimictic Lakes

Answer 30

Stratify twice a year
Warm epilimnion in the summer
Cold epilimnion in the winter

Question 31

Amictic Lakes

Answer 31

Never mix

Covered by ice

Question 32

Polymictic Lakes

Answer 32

Shallow lakes
Stratify in the mornings
Mix often by afternoon winds

Question 33

Meromictic Lakes

Answer 33

Contain a very dense hypolimnion that resists mixes

Question 34

Monimolimnion

Answer 34

A hypolimnion that is dense and resists mixing

Question 35

Chemocline

Answer 35

Rapid chemical concentration change

Question 36

Three patterns of oxygen stratification

Answer 36

Orthograde - oxygen saturated throughout water
Clinograde - high oxygen in algae filled epilimnion, low oxygen in deep darker hypolimnion, higher productive lakes
Heterograde - highest oxygen in metalimnion near thermocline, typically low productivity in these lakes

Question 37

Orthograde

Answer 37

Oxygen saturater throughout water

Question 38

Clinograde

Answer 38

High oxygen in algae filled epilimnion
Low oxygen in deep darker hypolimnion
Higher productive lakes

Question 39

Hertograde

Answer 39

Highest oxygen in metalimnion near thermocline

Typically low productivity in these lakes

Question 40

Eutrophic Lake

Answer 40

Nutrient rich (Clinograde)

Question 41

Oligotrophic

Answer 41

Laking nutrients (Heterograde)

Question 42

Euphotic Zone

Answer 42

Upper layer with photosynthesis occurring (secchi disc)

Question 43

Aphotic Zone

Answer 43

Deeper water (secchi disc)

Question 44

Turbidity

Answer 44

The side scattering of light