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Lecture 12

BIOL 3130 Lecture Notes - Lecture 12: Microsite, Meta-Analysis, Inbreeding Depression


Department
Biology
Course Code
BIOL 3130
Professor
Andrew Mac Dougall
Lecture
12

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Bio 3130 Lecture 12
Case Study: Burger King animal feed sourced from deforested lands in Brazil and
Bolivia
- Has been buying animal feed produced in soy plantations carved out by the
burning of tropical forests in Brazil and Bolivia
- Jaguars, giant anteaters, and sloths have all been affected by the
disappearance of forest land between 2011 and 2015
Evolutionary, morphological, and distributional responses to climate change: the
evidence
Climate Responses:
- Rapid Evolution Hypothesis: strong and immediate climatic-based selection
on population traits-evolutionary change
- Plasticity Hypothesis: strong and immediate climatic-based adjustments in
growth, phenology, and reproduction-ecological change
- Migration Hypothesis: strong and immediate climatic-based adjustments in
population distribution-migration or ecological selection
Plasticity or Adaptation?
- increased temp by 3.5C; eliminated rainfall: an event of biblical proportions
- buffering: no net change in population size or population structure
- but all compensatory responses involved inbreeding
- hidden long-term effect: inbreeding depression the lag effect
Buxten Climate Change study
- calcareous grassland
- long term manipulations
o temp/water interactions
o plots, replicates
- No progressive chnge in composition after 13 years in plots
o Major life form groups unchanged
o Species composition fairly stable
- Microsite variation prevented species loss in response to climate change
o 9 out of 25 species exhibited a microsite treatment interaction
Crimmins 2011
- changes in climatic water balance drive downhill shifts in plant species
optimum elevations
- uphill shifts well documented: leads to expectations of continued uphill shifts
under future warming
- climate changes: significant downward shift in species optimum elevations
- contrary to expectation, but readily explained by species niche tracking of
regional changes in climatic water balance rather than temp.
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