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Ecology test 4 > Lecture 2; River Continuum Concept (RCC) and Nutrient Spiralling > Flashcards

Lecture 2; River Continuum Concept (RCC) and Nutrient Spiralling Flashcards

1
Q

name order of hierarchical scale

A

stream, segment, reach, pool/riffle, microhabitat

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2
Q

different flow types

A

pools, riffles, gliddes

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3
Q

how have we made it a one way flow?

A

urbanising and channelling rivers

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4
Q

instars are…

A

different growth stages when the insect sheds its exoskeleton and grows a new one

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5
Q

name for insects which undergo incomplete metamorphisis stage, series of instars to become an adult?

A

Hemimetabolous

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6
Q

name for insects which undergo complete metamorphisis and become larvae/pupae

A

Holometabolous

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7
Q

4 functional feeding groups

A

shredders
collectors (gatherers and filterers)
sracpers
predators

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8
Q

role of shredders?

A

utilize CPOM and produce FPOM in this process

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9
Q

role of collectors gatherers?

A

collect organic matter form the bed of river

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10
Q

Role of collector flterers?

A

filter FPOM from water column, spin silk and build nets between rocks to filter FPOM

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11
Q

Role of scrapers?

A

scrape diatoms and attached algae form the surface of stones and rocks

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12
Q

Role of predators?

A

eat other 3 types of invertebrates

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13
Q

4 stages of decay of leaves in streams?

A
  1. leaching
  2. conidiotniing
  3. Invertebrate shredding
  4. Physical abrasion
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14
Q

which decay phase takes 30 days?

A

conditoning

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15
Q

what attracts shredders to leaves?

A

bacteria and funghi

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16
Q

when was RCC introduced?

A

1980

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17
Q

what does RCC explain?

A

communities and different reaches of the rier develop different strategies wot use carbon/energy inputs and minimise carbon loss

18
Q

what is stream order?

A

a way to classify streams by size in relation to whats going on

19
Q

what is a first order stream?

A

a stream which flows directly from any source

20
Q

How is a second order stream made?

A

when 2 first order streams meet,

21
Q

how is third order stream made?

A

by 2 second order streams meeting

22
Q

3 different sectiosn of the RCC

A
  • headwaters
  • middle reaches
  • lower reaches
23
Q

name the functional groups which dominate headwaters?

A

shredders and collectors

24
Q

functional groups which dominate middle reaches?

A

collectors and scrapers

25
Q

functional groups which dominate lower reaches/larger rivers?

A

collectors and predators

26
Q

where is P/R LOWER than 1?

A

headwaters and lower reaches

27
Q

where is P/R GREATER than 1?

A

middle reaches

28
Q

what conditions do collectors favour?

A
  • available FPOM for them to feed on
29
Q

what conditions do shredders favour?

A
  • high amount of leaf retention
30
Q

what conditions do predators favour?

A
  • higher order streams, larger
31
Q

when is a stream considered heterotrophic?

A
  • where p/R < 1

- limited light penetration

32
Q

What is DIC?

A
  • dissolved inorganic carbon

- consists of co2, bicarbonate and carbonate

33
Q

What is DOC?

A

Dissolved organic carbon

- organic material that can pass thorugh a filter (<0.7um)

34
Q

what is PIC/POC?

A

Particulate organic/inorganic carbon

- cant pass through a filter

35
Q

how is FPOM produced in the stream?

A
  • DOM gets shredded and becomes FPOM used by collectors

- autotrophs used by scrapers produce FPOM

36
Q

name 3 nutrients which are limiting to productivity

A
  • C, P, N
37
Q

What are the different relative %s of inorganic and organic carbon in the stream?

A
  • 90% travel downstream inorganic

- 10% as organic

38
Q

uptake length?

A

average distance travelled by a nutrient molecule in inorganic form before removal from the water column

39
Q

spiral length =

A

uptake length (inorganic) + turnover length (organic)

40
Q

geomorphic factors influencing nutrient uptake?

A
  • physical properties of channel

- dictates residence time of water within reach

41
Q

geomorphic retention of nutrients depends on…

A

-hydrology
- size of particle
- heterogeneity of stream bed
LWD

Ecology test 4 (3 decks)

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