BIOL 290 Lecture Notes - Lecture 1: Permafrost, Food Web, Theodosius Dobzhansky

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7 Sep 2018
Humans have changed the Earth
Thursday, September 6, 2018
9:05 PM
Humans have changed the Earth
Green house gasses
Co2 level increase
Sea level changes
Sea water acidic changes (can cause major disturbances in aquamarine life development);
can also cause dissolving habitats in the ocean
Endocrine disruptions: hormonal disruptions from pollutants like BPA
Climate Impacts on Ecosystems
Timing of seasonal life cycle events
Ex: In 2010 & 2012 plants in Eastern U.S. flower buds produced flowers earlier than ever
Range shift: species move north because of sea changes
Food web disruptions: reduced production in oceans that are in areas where temperature
of the ocean has increased
Melting permafrost: deep layer of ground, that remains permanently frozen all year round;
when it melts it releases methane because plant life has been captured in the ice over the
Higher extinction risks
Pathogens, Parasites and Diseases
Higher/ longer transmission seasons with higher temperatures
Shift change risks: malaria carrying mosquitos can move further North with warming
Threshold Effects
Biological changes are not necessarily gradual. A system may be stable up to a threshold
level then shift rapidly
Not linear
Links between change, evolution and population
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