Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BIOL 2903 > Lecture 9 > Flashcards

Lecture 9 Flashcards

1
Q

Beaver tails - how do they benefit beavers?

A
  • Steering/balance when floating
  • Pumping blood into the tail lets them cool down in the summer
  • Allows for conservation of heat in the winter
  • Balance while sitting
  • can warn other beavers of predators by slapping the tail
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why do beavers have orange teeth?

A

Iron oxides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

T/F: beavers only eat plant material like poplar and aquatic plants (e.g. water lilies)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When are young beavers kicked out of the colony?

A

after 2 years

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Plants in beaver ponds

A
  • Root at the bottom, leaves/flowers float on the surface

- Leaves are eaten by insects & moose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Whirligigs

A

beetles on the water’s surface of beaver ponds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Midges

A

Type of fly found on the surface of beaver ponds

  • larvae are in mud at the bottom of ponds
  • form large mating swarms when many float to the surface
  • food source for insects, birds, dragonflies, damselflies, etc near beaver ponds
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

T/F: beaver ponds are a lotic water system

A

False: no water current = lentic system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Since beaver ponds are lentic water systems, how does this benefit dragonflies?

A

They can just wait for food to pass by on water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are skimmers?

A

Large-bodied dragonflies that skim over water to get food; associated with beaver ponds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which group of animals lays eggs in beaver ponds?

A

Amphibians

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

T/F: some frogs live at the bottom of ponds in the winter

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

T/F: the mink frog is only found in the boreal forest

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

T/F: warmer water results in more biodiversity (i.e. more species)

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

These mammals live in lodges around beaver ponds:

A

Muskrats

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

T/F: most semi-aquatic/aquatic weasels have webbed toes to help them swim

A

False: hairs on feet create a larger surface area, helping them swim

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

T/F: beaver ponds support a large ecosystem with lots of plants/animals

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

River otters

A

Aquatic weasel

  • eat frogs, fish
  • short legs, large hind feet
  • streamlined shape helps with swimming
  • confined to freshwater
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What happens when a beaver dam breaks (after the beavers leave/die)? What type of habitat develops?

A
  • nutrient-rich mud at the bottom is exposed to air
  • plants colonize the area (e.g. sedges)
  • beaver meadow develops
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Why are beaver meadows also known as rendez-vous sites?

A

Adults wolves will leave their pups there to play and bring back food

21
Q

Which animal uses beaver meadows as mating sites?

A

Moose

22
Q

How do beavers indirectly help moose?

A
  • Creation of beaver meadows

- Beaver ponds have sodium-rich plants

23
Q

What can happen to trees after a dam goes up? How do other species benefit?

A

They get flooded and die; become habitat for fungi, beetles, woodpeckers

24
Q

Do beaver ponds increase or decrease a region’s biodiversity?

A

Increase

25
Q

How do dead trees benefit birds?

A
  • Holes in bark become habitat (tree swallows, owl, common goldneye, hooded merganser)
  • Perches for hunting birds
26
Q

Beaver ponds are a source of ___& ___ for organisms in them and downstream of them

A

nitrogen, phosphorus

27
Q

Beaver ponds maintain water tables, which are…

A

The level of water in the soil in the surrounding area

28
Q

How did the Boreal Forest end up with thousands of lakes?

A

Water from melting glaciers remained in troughs/ridges of rock

29
Q

Why are Boreal Forest lakes richer in nutrients than HBL lakes?

A
  • Warmer climate = more decomposition
  • More developed soil
  • Nutrients washed in by rain
30
Q

What birds feed on fish in Boreal Forest lakes (5)?

A
  • Ospreys
  • Eagles
  • Kingfishers
  • Loons
  • Mergansers
31
Q

Why do loons nest on the shoreline of lakes?

A

Legs’ position makes walking upright difficult, so they need to be close by to dive in

32
Q

How do islands in Boreal Forest lakes benefit animals?

A
  • Safety; predators won’t expend energy to swim
  • Nesting for herring gulls, common terns
  • Pregnant moose give birth on islands
33
Q

T/F: there are 3 species of terns in the Boreal Forest

A

F: the common tern is the only one

34
Q

T/F: the Boreal Forest has lots of site relief and lotic water systems

A

True

35
Q

How do insects (e.g. blackflies, net-spinning caddisflies) benefit from moving water?

A

Filter-feeders; water moves through them and food enters their bodies

36
Q

Fast-moving water is home for clubtail dragonflies, such as:

A

Boreal Snaketail

37
Q

Western/Prairie Boreal (WBF) - characteristics

A
  • Low elevation (350m ABS), but still has hills
  • Thin soil, exposed igneous/metamorphic rock
  • Dry, warm
  • Large water bodies
38
Q

What causes high temperatures in the WBF?

A

Hot/dry prairie winds

39
Q

What glacial lake covered most of the WBF? How did lakes form here?

A

Lake Agassiz; melting glaciers formed large bodies of water

40
Q

The BF has more wildflowers than the HBL, such as:

A

pale corydalis

41
Q

Which conifers dominate the WBF (2)?

A
  • Black spruce

- Jack pine

42
Q

Why is balsam fir rare in the WBF?

A

Not enough moisture in the area

43
Q

This plant is only found in the WBF:

A

Prairie crocus

44
Q

Jack pine needles

A

short, grouped in pairs

45
Q

Yellow-bellied flycatcher

A
  • Ground-nesting

- Camouflaged by green colour on their backs

46
Q

Examples of predators in the WBF (5):

A
  • Gray wolf
  • Cougar
  • Marten, fisher, wolverine
47
Q

T/F: jack pine seeds are an important food for crossbills and red squirrels

A

F: they can’t open the cones to get the seeds

48
Q

This animal lives in rocky areas in the WBF:

A

Least Chipmunk

BIOL 2903 (24 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions