Lab 1: Beaver Creek Conservation Area Field Trip Flashcards Preview

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Flashcards in Lab 1: Beaver Creek Conservation Area Field Trip Deck (37):

Why is Beaver Creek atypical?

Man prairie streams are located in old glacial melt water channels and in this respect Beaver creek is atypical as it is responsible for the development of its valley and therefore represents a post-glacial geographic feature.


What caused the low irregular hills?

Product of direct deposition by the glacier as it melted.


Where is the highest elevation in saskatoon?

Beaver creek at 615m ASL


What are Ice ages?

are long periods in time where mean global temperature is lower than normal and fluctuates causing continetal ice sheets to grow and then shrink cyclically over tens or hundreds of thousands of years.


Glacial Periods are?

Periods in an ice age where mean global temperature is low enough to allow continental ice sheets to grow.


Inter glacial Periods are?

higher temperatures causing ice sheets to melt and retreat.


Glacial Till is?

During the glaciers reatreat the glacier deposited a great deal of mineral material; clay, silt, sand, gravel and rock which had been incorporated into the ice during the glacier's advance.


What place represents he highest elevation in Saskatchewan and central plain of North America?

Cypress hills


Where is the phenomenom of slumping common?

is common in rivers which flow through unconsolidated material.


What is the composition of the land form sediment?

first 7 m is deltaic sand, followed by 25 m of silt clay. beneath this is compacted glacial till. So this represents about 32 meters of lake and river sediments resting on glacial deposits.


What is the difference between the north and south faceing slopes?

Difference in moisture. The slopes which face south receive more direct sunlight while slopes facing north are much more shadier. So although they may receive same amount of rainfall the south facing slop loses more of its water to evaporation. (up to 40%)


What does IBP stand for?

International biological Program.


Define theoretical Ecology:

Patterns we can see in nature


Define applied ecology:

Uses the info from theoretical ecology and apply it to solve questions and problems.


What are 3 disciplines in ecology?

1.) Eco-system management ex.) foresters.
2.) Landscape ecologists
3.) Conservation biology: enhancing or developing conservation of species and land


What is restoration ecology?

Restore damaged or extrapolated habitats.


What are the 3 types of prairies:

1.) short grass prairies
2.) Mid or mixed grass prairies
3.) Tall Grass prairie


Types of short grass prairies:

Blue Grama Grass.
Spear Grass (50% grass cover, awn tail of spear grass, the seeds actually plants itself, drills themselves into the ground.

June Grass:


Hydric Ecosystem:

water in excess to what the plant needs to survive. ex.) swamp


Mesic ecosystem:

Has a water balance. Has just enough water for the plant.


Zeric ecosystem:

Dry. Water shortage. Plant growth limited by water.


Where is short grass praies found in? what ecosystem?

found in low mezic or high zeric ecosystems.


What plays a role apart in water balance in ecosystems?

1.) rainfall
2.) Evaporation
3.) Soil type


is tall grass prairie easy or hard to restore?



is mixed grass prairie easy to restore?

takes a little longer to restore! But can be done!


Can short grass prairie be restored?

Has never been a successful restoration of short grass prairie.


what adapatation does short grass prarie have to maintain water since it lives in a zeric site.

Stays low to ground because winds drys it out.


What is a Forb?

Any plant that isnt a grass and does not have a wooden stem.


Where do cottonwood poplars grow?

Flood planes


Where do aspen poplar or tremblind aspen grow?

On flat dry surface.


Where do balsalm poplar grow?

where water goes though soil. Sepage area.


Why are cottonwood poplars not being re born?

They need flooding to seed in and since dams controls flooding they are not being re-born.


What degree incline is the potters clay at level of river?

2 degrees.


What rate is it slumping?

1.25 m a year.


How does slumping happen?

The bottom 6 meters of lacustrine sediments are saturated. This layer of saturated silty clay has little load bearing strength and quite slippery. As a result large sections break free from the bank and begin to slide and settle towards the river when the river erodes the tow of bank. The first block removes support for the bank behind it and a second block breaks free and begins to slump. This process continues.


How did the river help form the valley?

It carried the sand the silt and the clay leaving the gravol behind and then when it got to the lakes the velocity of the water slowed which allowed the sand to drop and settle at the bottom, or the edge of the lakes, and then once winter came and the lake froze over the silt and the clay was able to settle. because the water was no longer turbid.


How did the glacial help form the lands Glacial Lakes:

Glacial acted like a dam which caused water to pool, which in part flattened out the prairies but also caused local depression and some of the lakes were permanent. The glacial retreating also flattened a lot of lands.