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IB2.31.3 Causes of extinction
Causes of extinction
© Oxford University Press 2011
IB2.31.3 Causes of extinction
New predators
New
competitors
Changes to
environment
Causes of extinction
There are many possible causes of
extinction. Several factors may
combine to bring about an
extinction. Often, extinction will
result if a species is unable to
adapt or is outcompeted by a rival.
New diseases
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more.
Major catastrophic
events
Changes
Major
New
competitors
predators
diseases
catastrophic
to the(e.g.
environment
events
humans)
(e.g.
over
volcanic
time (e.g.
eruptions)
Manyred
The
Hunting
Some
temperature
believe
diseases
squirrel
by humans
increases)
that
can
is dinosaurs
now
has
wipe
inbeen
out
serious
became
an
responsible
entire
decline
extinct
species
in
forthe
following
the
before
UK an
it
asteroid
following
extinction
has
The
time
woolly
impact
to
the
ofmammoth
develop
many
introduction
which
animals.
immunity.
became
resulted
of The
theThe
extinct
ingrey
dodo,
reduced
elm
squirrel,
about
which
treesunlight
population
10,000
lived
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onand
the
is
which,effective
more
island
almost
years
ago,
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in
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meant
competitor
because
to
became
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that
fungal
plants
than
the
extinct
disease
climate
the
could
resident
in the
became
called
notseventeenth
species.
Dutch
warmer.
elm
photosynthesise
century,
disease.
not long so
after
effectively.
humans first landed there.
© Oxford University Press 2011