lakes and reserves

Question 1

T/F: all lakes are permanent

Answer 1

no lakes can be perminant or intermittent depending on precipitation levels/seasonal variation

Question 1

T/F: a lake is slowly moving, or not moving water and also it’s connected to the ocean

Answer 1

false lakes are NOT connected to the ocean

Question 2

lakes can be formed by

Answer 2

glaciers, plate tectonics, dams, dormant volcanos, sinkholes, meteors and wind erosion

Question 3

how do glaciers form lakes

Answer 3

• as it moves, it creates pockets in earth. all the leftover ice in those pockets = lake

Question 4

how do plate tectonic form lakes

Answer 4

graben lakes = fault lines cause crust to drop = form depression (lake baikal)

horst lakes = block of crust tilts and leaves a depression

Question 5

how do dams form lakes

Answer 5

blocking a stream or river by rock or debris can trap water
caused by beavers, land slides, lava crap…

Question 6

3 lake habitats

Answer 6

• pelagic zone
• profundal zone
• littoral zone

Question 7

which lake habitat areas most diversity

Answer 7

• most diversity in upper layers (pelagic and littoral) because more light

Question 8

use a bathymetric map to tell you…

Answer 8

lake shape and size

Question 9

what is retention time

Answer 9

Retention time = average length of time water stays in a lake

Question 10

what’s shoreline development?

Answer 10

shoreline development: the longer the perimeter = the more shoreline development

Question 11

lake laogai has a shoreline development = 1.0
what does this mean

Answer 11

it’s circular, most water in the lake isn’t touching the shore

Question 12

lakes that are ____ and have ____ are more productive. explain

Answer 12

shallow and high shoreline development

shallow = more light grows plants, more mixing by wind

high shoreline = more nutrients seep into water

Question 13

3 reservoir characteristics

Answer 13

• high shoreline development index
• shallow depth
• productive

Question 14

why has sediment outputs to oceans decreased?

Answer 14

because the resevoirs are holding on to the sediment

Question 15

resevoirs has very controlled outflow of water, therefore there can be ____ fluctuations in water levels

Answer 15

large

Question 16

large fluctuations of water levels from a reservoir has the greatest effect on ____ communities

Answer 16

littoral

Question 17

3 stratification layers

Answer 17

epilimnion
metalimnion
hypolimnion

Question 18

monomictic vs dimictic stratification

Answer 18

mono stratification = once a year in the summer the lake stratifies, mixes and evenly dispersed during other times of year

di strat = stratifies twice a year (summer and winter), and mixes in spring and fall

Question 19

amictic stratification means the lake is _________ and occurs where

Answer 19

always stratified (separated layers)
occurs in tropics or polar regions

Question 20

polymictic stratification occurs ____ times a yer

Answer 20

many

Question 21

T/F: stratification in lakes is caused by thermal gradient and no mixing

Answer 21

false because it can be different layers of thermal or salt gradients
+ no mixing ofc

Question 22

wave height determined by ___ and ___-

Answer 22

wind strength
lake fetch

Question 23

sciche waves only occur under these two conditions:

Answer 23

lake is stratified
wind is persistent

Question 24

waves cause ___ and ____

Answer 24

mixing and shore erosion