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Flashcards in LEC 23 Deck (21):
1

a community or suite of communi2es and the physical environment (includes bio2c + abio2c factors)

ecosystem

2

All life depends on the energy stored in ____; the dynamics around that energy shapes ecosystems

chemical bonds

3

Energy flows through communi2es from one kind of organism to another, in a hierarchy of levels •Each of these is a ____

trophic level

4

Energy that maintains life contained in

light and chemical bonds

5

he number of trophic levels depends on the total amount of ___ available in a community

energy

6

rate at which photo-­‐ or chemosynthesis produces organic products) at the producer level sets the stage; measure of amount of energy available
–Gross primary productivity
-net primary productivity

primary productivity

7

when energy changes from one form to another form, or matter moves freely, entropy (disorder) in a closed system increases. Differences in temperature, pressure, and density tend to even out horizontally after a while.

2nd law of thermodynamics

8

As energy moves through the ____ of communities, more and more of it becomes heat at each successive level

trophic levels

9

Rate of maOer (or energy) conversion/synthesis by heterotrophs

secondary productivity

10

____ shapes communities, determines # of trophic levels.

Amount of energy available and its movement through trophic levels

11

is the production of useful chemical energy that is being used to carry out the processes whereas

Gross primary productivity

12

is chemical energy that is not being used but stored

Net primary productivity

13

s the total stored or incoming energy of main chemical producers

NPP

14

is the total expended or outgoing energy of the main chemical producers

GPP

15

represents the formation of living mass of a heterotrophic population or group of populations over some period of time

secondary productivity

16

can be found at any trophic level.

parasites

17

____ eat from all levels.

Decomposers, detri8vores, and scavengers

18

an animal that feeds on dead organic material, especially plant detritus.

dentrivore

19

Only a fraction of ___ (average of 10%) conveyed from one level to the next

energy

20

amount of energy (and biomass) available for higher trophic levels is ____

small

21

_________ (energy, biomass, # of individuals) vary from community to community usually have a broad producer base

ecological pyramid structures