L13 Flashcards

1
Q

Biodiversity

A

The genetic, species, and ecological richness of the organisms in a given area

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2
Q

species richness

A

count of how many species are present in a defined area

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3
Q

species diversity

A

measure that incorporates both species richness and evenness

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4
Q

what happens to communities that aren’t evenly distributed?

A

dominance, rarity

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5
Q

shannon diversity index

A

represents degree of heterogeneity in a community

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6
Q

(shannon) high value of H

A

high species diversity

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7
Q

(shannon) low value of H

A

low species diversity

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8
Q

“stressed” rank abundance curve

A

steep slope, high initial value

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9
Q

“stable” rank abundance curve

A

gradual slope and lower initial start

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10
Q

detritus

A

all forms of nonliving organic matter

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11
Q

Categories of detritus

A

CPOM, FPOM, DOM

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12
Q

detritivores

A

primarily insects, crustaceans that feed on detritus

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13
Q

decomposers

A

organisms that use dead organic matter as an energy source (fungi, bacteria)

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14
Q

Process of detrification:

A
  1. Microbes colonize
  2. produce FPOM
  3. Invertebrates come and consume FPOM
  4. Shredders feed directly on leaves (PB)
  5. Predators eat
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15
Q

High “N” leaves

A

fast decomposition

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16
Q

Low “N” leaves

A

slow decomposition

17
Q

Shredders

A

stonefly, caddisfly

18
Q

Collector/gatherer

A

midge

19
Q

filter feeders

A

black fly, net-spinning caddisfly

20
Q

scrapers/grazers

A

mayfly, riffle beetle

21
Q

predators

A

dragonfly