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Summary Alevel OCR Biology A notes on Biodiversity £3.49
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Summary Alevel OCR Biology A notes on Biodiversity

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Alevel OCR Biology A notes on Biodiversity from an A* biology student.

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  • July 1, 2023
  • 2
  • 2022/2023
  • Summary
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lottiemcgowan1
Biodiversity
-




study of all variation that exist between all looms of life doesnt account for
nod individuals of
each species
habitat diversity-range
ecosystems/habitan
of diff
-




propation of diversity:number of diff (species of abundance (species evennes
-



species species richness) +

evenness

paynoplic gene
Loci r ↳> I A 4
species diesity: stability =
resilient to emironmental changes
proportion of
reterocygalc- diversity of
genetic diversity: alleles genes
+


species
in genome


population

alele richness ↳measure proportion of genes my more than I able


4
occur due to bictic factors (new predators, pathogens competition
+


w/ other species)


sampling abundance distribution of
-



measure species populations
= +
+





Random no
=
bias



=quadrats:slow moving animal/plants


-sweep news:
very small holes
flying
=
insect +
long grass insects



=pitfall traps=cans/jax buried in ground, catch ground insects


=posters:s m a l l conciers w/ a tubes bed such
to
up small insects


-fullgren furel= hunvel my light bulb abal +
container below: collect insects in leaf litter/scil

-lich sampling freshwater inetabrates streams/rivers, her stream, stream lickedinto her.
-

in on




↳Non-random=opporitc=pich sampling location based on nen-various factors


-stratified:m arch no of sampling locations habitat
in w/relative proportion of area.




=systematic clear
-

change physical
in conditions across area beling studied (transects.

↳ Line
transect record organisms that touch straight
the line at equal distance.
=





belt transect quadrats
= at
regular interds along tape + record abundance/percrage cover




-man-release-capture motile animab
=




=1st sample talentcounted marked
+ -
retured to habitat, time pass
->
capture crother sample


estimate size N (H1 =
x n2) n, maxed indidat
=




population
=




nd
12 2 sample (male unmarked)
=
+




M2
Mc =
2nd sample maled insects




Simpsone diversity
-




doesnt ill strate
quantily biodiversity
index:
n single species
=




allele richness of
breed/specif
=



D 1 = -

z(+4 NV a l l=
species



Proportion of polynolic gene loci diversity
-




genetic
=




P rod loc
polymorphic
- =




gene
total no of loci

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