Week 10 Friday Flashcards

1
Q

what is the first law of thermodynamics?

A

energy cannot be created nor destroyed, but transformed.

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2
Q

what is the second law?

A

heat energy will move from a warmer system to a cooler one

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3
Q

what is the 10% rule?

A

the idea that energy is passed thru an ecosystem from one trophic level to the next, only 10% of the energy is passed on

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4
Q

why do food webs generally only have 3-5 levels?

A

higher levels would not be productive enough

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5
Q

what are the groups of organisms in trophic levels

A

primary producers, primary consumers, secondary consumers, e.t.c

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6
Q

influences of bottom up control

A

influences of physical and chemical factors

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7
Q

influences of top down control

A

influences of consumers

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8
Q

what determines whether a community is controlled from the top or the bottom?

A

the relative importance of predation and primary production

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9
Q

when is compensation more likely to happpen, and what does it do?

A

when many species are present at each trophic level and it blocks cascading effects

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10
Q

what is a green world (trophic level wise)

A

3 or 5 levels

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11
Q

what is a brown/blue world (trophic level wise)

A

2 or 4 levels

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12
Q

why are trophic dynamics still debated

A
  • both top-down and bottom-up forces can play roles - but the forces they exert are not always equal or easy to see
  • organism with a wide diet breadth and omnivores complicate understanding the extent of relationships and their interconnectedness
  • a trophic cascade is blocked by the effects of compensation and within-level competition
  • complex and diverse communities could limit the impact of trophic cascades
  • even simple systems are not so simple
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13
Q
A
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