LECTURE 11 -> Conservation ecology Flashcards
What is extinction?
When a species that once existed no longer exists
What are ecosystem services????
Things that add a value to ecosystems and what they do for us
provisioning services
stuff we obtain from ecosystems
- > ex// food, wood
- > declining fishing from overexploitation
Regulating services
things we gain from regulating functions
- > ex// air/ water quality, pollination, climate
- > all kinda declining
Supporting services
things that support all the other things
-> note: there is a tipping point for function and diversity
Cultural services
Nonmaterial benefits
->ex// religion, mental health, aesthetics, ecotourism
Habitat fragmentation leads to
less gene pool mixing if splitting a population in two
-> for conservation, want one big or many small depends on species dynamic
Extinction vortex explains
that lower population sized leads to a positive feedback loop
->less gene mixing, more inbreeding
invasive species
Not all that is introduced can live. Often has to bring something new to the table
-> arrive, thrive, survive (10%)
Caughley’s two paradigms
Small population Paradigam -> links to enxintion vortex (Minnimum viable population)
Declining population paradigm -> prevention of species decline
Must think holistically, multiple factors
biofuel effects
Theoreticly YAYAYAY clean energy! BUT
->more land to this, less land for agriculture in us, then amazon forest cut down for agriculture
pesticide use and feedbacks
more pesticide use, more resistance, then EVEN MORE, then new pests etc.
Leads to biomagnification
Predictions and fishing (MSY)
Minimum sustainable yield -> Sweet spot fo enough food caught and enough stock left to grow
-> Kinda not the best…. Ignores pop structures and if is calculated, huge effects
