4271472
Predicting Extinction Risk
- threats to biodiversity
- anthropogenic drivers
- biological resource
use (fishing,
harvesting etc)
- invasives,
problem spp,
hybridisation,
disease
- pollution
(metals,
nutrients, POPs,
litter)
- climate change
and severe
weather
- habitat destruction/degredation
- residential
and
commercial
development
- agriculture,
aquaculture,
forestry
- energy
production and
mining
- transportation and
service corridors
(incl. power lines)
- human intrusions and
disturbances (eg war,
hikers etc)
- natural systems
modifications (dams,
fire regimes, etc)
- residential
and
commercial
development
- biological resource
use (fishing,
harvesting etc)
- natural drivers (still
exacerbated by
people)
- geological events
- other threats (eg meteors)
- geological events
- anthropogenic drivers
- to maintain current human
population at current
standard of living we need the
resources of 1.4 earths; yet
people keep breeding and still
aspire to a higher standard of
living
- life history
- large, K-selected spp more at risk from deterministic
extinction (declining population paradigm) because they
are not able to handle extra mortality
- small, r-selected spp more at risk from small population
paradigm (stochastic extinction) cause they are subjuect to
large popuklation fluctuations so can fall into extinction
vortex if N is too small
- large, K-selected spp more at risk from deterministic
extinction (declining population paradigm) because they
are not able to handle extra mortality
- taxon cycle (spp have a "life-cycle"
vs younger plants more at risk of
extinction
- specialists at risk (diets and habitats), spp
that need multiple habitats to complete
their life histories (eg migrants)
- close mutalisms (e.g.
replying on a single
pollinator)
- extinction cascades:
loss of a keystone spp
can trigger extinctions
of dependent spp
- allee effect: an individuals fitness suffers at low population
densities. eg to breed (passenger pigeons) to hunt in packs (wild
dogs). spp that aggregate are more susceptible to extinciton
- vagility
- pros:
- cons:
- pros:
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