108601
Description
Mind Map by harry_bygraves, updated more than 1 year ago
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Created by harry_bygraves
almost 11 years ago
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Investigating populations
- A truly representive sample should be;
- taken at random to
ensure that every
meneber of the
population has an
equal chance of
being selected
- Unbiased
by the
sampling
equipment
or method
uses
- large enough to
provide a
sufficiently
precise estimate
of the population
- taken at random to
ensure that every
meneber of the
population has an
equal chance of
being selected
- Random sampling is designed to
ensure that individual organisims at
each point within the study area have
an equal chance of being sampled
- Transect sampling
- Line transect - a tape of string is laid
along the ground in a straight line
between two poles to indicate the limit of
the transect. Sampling is confined
strictly to recording all organisms
actually touching the line
- Belt transect - is a strip of
chosen width through the
habitat. It is made by laying
to parallel, between which
all individuals are recorded
- Continuous transect -
is a line or belt
transect in which the
whole line or belt is
sampled. interupted
transect, samples are
taken at points along
the line or belt
transect
- Line transect - a tape of string is laid
along the ground in a straight line
between two poles to indicate the limit of
the transect. Sampling is confined
strictly to recording all organisms
actually touching the line
- Percentage cover, the
proportion of an area
covered by the growth form
of a plant or by sedentary
animal
- Percentage cover =
hits X100/hits +misses
- Percentage cover =
hits X100/hits +misses
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