BIO3082 Lecture Notes - Lecture 24: Desiccation, Industrial Revolution, Western Swamp Turtle
Lecture 24 – Assisted Colonisation
Anthropogenic Climate Change
• Evidence of Climate Change
o Large scale global changes
o In response to increase in industrialisation → increase in land and
ocean surface temperature globally over time (getting warmer)
o Increase in greenhouse gases (CO2, methane, NO)
o Strong correlation with human fossil fuel output increasing in response
to industrial revolution
• Future
o Will get warmer and wetter
• Response of Terrestrial Animals
Adaptation is Difficult
• Case Study: Lizards
o Warming is too rapid for adaptation - exceeding operative
tempeartures
o Ectotherms
▪ Too cold: not active
o Segment in middle is acceptable for activity
o Can predict rate of which lizards have to modify thermal biology in
order to survive under climate change
o Studies didn’t consider dispersal and current distributions
o Criticaltheraml min and max
▪ Smaller margin between optimal and max – less buffer
o Tropical species (Ectotherms)
▪ Narrower thermal tolerance breadths – don’t cope well with
extreme temperatures
• Buffer is low – low ability to adapt
o High latitude species
▪ Broader thermal tolerances
• Greater buffer – more adaptable
o Living on the edge
▪ Safety buffer
▪ Warming tolerance
▪ Evolution of CTmax constrained (range
restricted in the tropics)
• Ability for range restricted species to shift their ability to
cope with drier and colder conditions – was limited
o Desiccation
o Cold resistance
o Limit distribution and response to environmental change
Stay and Adapt
Disperse
Local Extinction or Species
Extinction
• New environmental
conditions
• Genetically adapt or
phenotypically plasticity
or behavioural responses
• Track climatic niche
• Die
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