Summary
Summary Population size and Ecosystem EDUQAS A level
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Summary of EDUQAS BIOLOGY component 1: Population size and ecosystem
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Ecologyhabitat :
place where species live
all species in habitat
community : a
mature
stationary
lag : not sexually
death
take time to find mate
/
←loÑ
pregnancy
got log :
no factor
limiting growth
stationary : birch = death
↳ in log
/ reach
carrying capacity
↳ die negative feedback leg less food predator d 9)
lag pop
:
, ,
time
biotic living ( predator / pathogen
:
non lining lniygen
abiotic temp )
: -
,
death : death > birth
Density
-
dependent = biotic . mate
, space in habitat
,
source of food
predator climate
Density independent
=
a bird new severe
,
-
.
Sampling techniques .
① Terrestrial animals
=
Mark -
release -
recapture ( Lincoln Index) Assumptions :
no births / deaths / immigration /
and marked
r emigration
→ animals are
captured
""d ^^
"
2nd sample total
1st sample ✗
no .
of marked 2nd sample
② Freshwater invertebrates
=
kick -
sampling and use Simpson 's Index
① Collect & identity animal using a
quadrat and a net
kick the area for set period
* Mark And Release
Collect animals in a net downstream -
find a suitable sample and
mark
③ Plants organisms
not to
-
make sure hurt them
=
Quadrat and transects and not to make them
Estimate % cover /frequency of each specie
visible by predators
release them and let population
Repeat at internals during path
-
reintegrate for ten
daysa .
-
come back and court
marked individual
number of
in
population .
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