B4 Ecology in the Local Environment part 2

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What is the capture-recapture method known as?
the Lincoln Index
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What is the capture-recapture method used to estimate?
a population size
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Why can populations be difficult to sample?
because species move around all the time
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What is step 1 of the capture-recapture method?
a trap is used to catch a sample of individuals eg.mice
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What is step 2 of the capture-recapture method?
the sample is counted and recorded and each individual is marked with a numbered tag/band or dot of paint
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What is step 3 of the capture-recapture method?
the individuals are released unharmed back into the environment, and are given time to redistribute themselves among the unmarked population
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What is step 4 of the capture-recapture method?
another sample of individuals is captured. some of them are already marked and some are unmarked.
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What is step 5 of the capture-recapture method?
the unmarked animals are counted and recorded. they are then marked and released
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What is the formula that can be used to estimated the total population size in the habitat?
population size = number in 1st sample (all marked) x number in second sample (marked and unmarked) divided by number in second sample which were previously marked
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When using the capture-recapture method what are the three things you have to remember?
1. assume that no organisms have died, immigrated or emigrated between sampling 2. make sure identical sampling methods are used 3. mark sure that marking them doesn't harm them or affect their survival
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How could marking an animal affect their survival?
if too much paint is used on invertebrates it can enter their respiratory system and kill them
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What is a transect line used for?
to map the distribution of organisms
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What studies do transect lines help?
the study of how species change across a boundary between habitats eg. a rocky shoreline
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What are the two steps to using a transect line?
1. a line like tape measure is laid out 2. quadrants are distributed in regualar intervals on the line, and the species in the quadrats are counted
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What does counting the animals and plants in quadrats along the line of transect give?
a lot of numbers
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As trend and patterns are hard to compare how instead do they present the data?
kite diagram
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What is the presence or absence plus abundance of an organism affected by?
other organisms (predators), physical factors (like tides or water temperature)
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What do kite diagrams show?
zonation
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What is zonation?
is the gradual change in the distribution of species across a habitat
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What can result in zonation of organisms in a habitat?
gradual changes in abiotic factors (non-living factors) eg. tides water temperature, salinity of a rock pool
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When is zonation clearly seen?
in rocky shores where there are distinct zones of organisms due to the changing tides and the different conditons created
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What helps identifying species in a sample?
putting them into a key
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Card 2

Front

What is the capture-recapture method used to estimate?

Back

a population size

Card 3

Front

Why can populations be difficult to sample?

Back

Preview of the front of card 3

Card 4

Front

What is step 1 of the capture-recapture method?

Back

Preview of the front of card 4

Card 5

Front

What is step 2 of the capture-recapture method?

Back

Preview of the front of card 5
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