Disturbance and Succesion

Question 1

Disturbance

Answer 1

a discreet event in time that causes abrubt changes in community structure and resource levels

Question 2

What is a disturbance regime characterized by?

Answer 2

disturbance type
frequency
intensity
extent

Question 3

recovery from distubrance = ________

Answer 3

succession

Question 4

Disturbance type

Answer 4

Abiotic
Biotic
Anthropgenic

Question 5

Abiotic disturbance

Answer 5

Severe weather
geological events
fire
flooding

Question 6

biotic disturbance

Answer 6

animal activity

Question 7

anthropogenic disturbance

Answer 7

human caused disturbances

Question 8

disturbance frequency

Answer 8

typical time between disturbances (ex: fire intervals are between 50 and 200+ year depending on site)

Question 9

Disturbance intensity

Answer 9

proportion of biomass removed and plants killed

Question 10

recovery time is generally _______ correlatated with intensity

Answer 10

negativly

Question 11

Disturbance extent (size)

Answer 11

area impacted by a single disturbance event

Question 12

Which dsturbances are easiest to manage?

Answer 12

severity and extent

Question 13

Succession

Answer 13

progressive change in the dominant species in a community, often following disturbance

Question 14

unit of succesion

Answer 14

sere

Question 15

general trends in succession

Answer 15

increased biomass
more complex physiognomy
more nutrients held in biomass
greater organic matter

Question 16

Primary succession

Answer 16

Succession on raw soil parent material

Question 17

secondary succession

Answer 17

succession on existing soil and generally some in-situ surviving propagules

Question 18

mechanisms of succession

Answer 18

the biotic or abiotic process that cause changes in vegetation

Question 19

Succession pathway or model

Answer 19

conceptual construct of succesion describing the temporal pattern of vegetation

Question 20

Small scale succession example

Answer 20

ground squirrel burrows

Question 21

stand replacing disturbances

Answer 21

plant life is leveled

Question 22

partial disturbances

Answer 22

certain speces are taken out

Question 23

small scale gap disturbances

Answer 23

small area disturbed

Question 24

example of large scale succession

Answer 24

glacial retreat

Question 25

successioin pathway

Answer 25

initial lichen-forb stage
dryas dominated
intermediate alder stage
sitka spruce forest

Question 26

major changes through succession

Answer 26

soil organic matter and nitrogen levels increase

Question 27

succession ________ always follow the same trajectory

Answer 27

does not