Population Size & Ecosystems Flashcards Preview

BIOL UNIT 3 mrs thomas > Population Size & Ecosystems > Flashcards

Flashcards in Population Size & Ecosystems Deck (45)
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1

Population

An interbreeding group of organisms of the same species occupying a particular habitat

2

Habitat

The physical environment where a particular population is found

3

Ecosystem

A community of living organisms (biotic) and the abiotic factors that influence them

4

Birth rate

Reproductive capacity of a population, number of new individuals derived from reproduction per unit time

5

Immigration

The movement of individuals into a population of the same species

6

Equilibrium Species

Species that control their population by competition rather than be reproduction and dispersal

7

Environmental resistance

Environmental factors that slow down population growth

8

Environment

Set of external conditions that surround an organism

9

Biotic

A part of the environment of an organism that is living

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Abiotic

A part of the environment of an organism that is non living e.g. Air Temperatures oxygen availability

11

Carrying capacity

The max number around which a population fluctuated in a given environment

12

Niche

The place where an organism is found and it's role in an ecosystem

13

Exponential

When the number of individuals in the population doubles per unit time

14

Abundance

The number of individuals in a species in a given area

15

Biomass

The mass of biological material in living organism

16

Tropic level

The number of times that energy has been transferred between the sun and successive organisms along a food chain

17

Saprobiont

A micro organism that obtains its food from the dead or decaying remains of other organisms

18

Gross primary productivity

The rate of production of chemical energy in organic molecules by photosynthesis in a given area at a given time

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Net primary productivity

Energy in the plants biomass which is available to primary consumers

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What is GPP & NPP measured in

Kjm-2y-1

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Primary productivity

The rate at which energy is converted by producers into biomass

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Secondary productivity

The rate at which consumers convert the chemical energy of their food into biomass

23

Succession

The change in structure and species composition of a community over time

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Climax community

A stable community that has reached equilibrium with its environment where no further change occurs

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Primary succession

The change in structure and species composition of a community over time in an area that has not been previously colonised

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Pioneer species

The first species to colonise a new area in an ecological succession

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Serial stage

The different stages in succession where particular communities dominate

28

Secondary succession

The changes in a community following the disturbance or damage to a colonised habitat

29

Mutualism

An interaction between organisms of two species from which both derive benefit

30

Commensalism

An interaction between organisms of two species from which one benefits but the other is not affected