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Viewing:

Principles of Eco (Lec 4)

front 1

Each Species has a range of

back 1

environmental tolerances that determines its potential geographic distrubution

front 2

The temperature of an organism is determined by

back 2

exchanges of energy with the external environment.

front 3

Organisms have two options for coping with environmental variation, which are?

back 3

Tolerance and Avoidance

front 4

Potential geographic range of a species is determined by

back 4

the physical environment

front 5

Physical environment influences an organisms ecological success in two ways?

back 5

1. Availability of energy and resources

2. Extreme conditions can exceed tolerance limits

front 6

Actual geographic distribution of a species is

Ex. Dispersal, competition, etc

back 6

related to other factors as well

* Differs from its potential Distribution

front 7

Most likely to differ bc of geologic differences

back 7

no data

front 8

Terrestrial biomes are categorized on the basis of

back 8

growth forms of dominant plant species

front 9

What are good indicators of the physical enviroment?

back 9

Plants because they do not move.

* ability to tolerate the full range of env conditions

front 10

Climate envelope

back 10

range of conditions over which a species occurs.

front 11

back 11

- Acclimatization can lead to a high breathing rate

- Acclimatization and adaptation may require an investment of Energy & Resources by the organism)

front 12

Adaptation is a transgenerational

back 12

genetic response of the population

front 13

Acclimatization is

back 13

short term reversible

front 14

Ecotypes are

back 14

Populations with adaptations to unique env.

- In both Abiotic and Biotic environmental factors

front 15

Andean Pop. have high rbc concentrations

Tibetans have faster breathing rates and

back 15

and large lung capacity

higher blood flows

front 16

Internal temp. influences

back 16

- rates of all rate processes

- cell membrane fluidity

- water turnover

front 17

Organisms temp. is determined by

back 17

the balance of gains and losses of energy to the external env.

front 18

Some organisms use behavior to

back 18

control exchange of energy with the environment

front 19

Behavioral thermoregulation

back 19

predominant mechanism of temp regulation in ectotherms

front 20

Heat exchange occurs across surfaces and

back 20

relative surface area decreases as organisms get bigger

Surface area:volume ratio decreases as organisms get bigger