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