Freshwater Abiotic and Biotic Interactions Flashcards Preview

ENVR 202 pt. 2 > Freshwater Abiotic and Biotic Interactions > Flashcards

Flashcards in Freshwater Abiotic and Biotic Interactions Deck (23):
1

Carboniferous

Forests, coal swamps, water versions of plants- giant ferns and horestails

2

Spore plants

need water to germinate, dominant in carboniferous, no seeds

3

First seed plants

seed ferns, all seed bearing plants evolved from these

4

Carboniferous trees

Lignin and cellulose had to break down, done so by fungi

5

Decomposers in carboniferous

poor habitat for fungi (water), main decomposer bacteria but can't break down wood- material doesn't get broken down

6

Plant growth in carboniferous

Lead to high atmospheric oxygen, the Second Oxygenation event, more plants photosynthesis = more oxygen, no decomposers using oxygen also lead to more oxygen

7

Animal life in carboniferous

dominated by large insects, , no vertebrate predators of the same size, high oxygen levels means more energy for size, few other animals on land

8

Emergence of reptiles

scales and thick skin to prevent desiccation, amniotic egg can be laid anywhere, no dependance on water

9

Coal

there is a lot from this time because no decomposers

10

Coalification

dead plant material forms coal, plant material buried before decomposition (peat)- more sediment adds more pressure and increases temperature (squeeze out water)- chemical composition altered- you get coal

11

Deltic/ Estuarine Cycles Coal swamps

Change with sea level, allow organic material to build up then be drowned with sea level rise- mixed salinity

12

Meandering River Cycles coal swamps

plant material buried through cycles of freshwater flooding, peat accumulation in floodplain

13

Why do rivers meander?

appears on low gradient slopes, weathering-erosion-transport- deposition, eventual change to curve because of deposition and then further erosion

14

Weathering

weakening and breakdown of rock

15

Physical weathering

Mechanical break up of rock (ice, rain, physical contact)

16

Chemical weathering

mineral breakdown by chemical reaction (water combining with chemicals to make a substance that breaks stuff down)

17

Biological weathering

Mechanical and chemical with biological life

18

Erosion

weathered material is moved from its original location

19

Transport

eroded material is moved from one location to another (requires energy input such as fast running water)

20

Deposition

No more energy for transport, material deposited

21

Fluvial sediment transport

size of particle determines how far it travels- dissolved in water, suspended in water, rolling/ sliding along bed

22

Flow rate

determined by incline of slope, volume of water, obstacles

23

Why did the carboniferous end?

tectonic plate movement, climate change with glaciation