Biology 3601A/B Lecture Notes - Lecture 2: Ocean Acidification, Habitat Destruction, Precautionary Principle
11 Apr 2018
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Document Summary
Human actions= warming + acidification of oceans (low ph) =low 02 increased hypoxia (insufficient amount of oxygen in tissues) The speeds of many negative changes to the ocean are moving fast (accelerating) The magnitude of the cumulative impacts on the ocean is greater than previously understood. Oceans recovery from climate change impacts is severely compromised by the other stressors from human activities: fisheries, pollution and habitat destruction. Ecosystem collapse is occurring as a result of both current and emerging stressors. The extinction threat to marine species is increasing rapidly. Which taxa and locations are specifically prone to ocean warming. Requires integration of thermal biology and ocltt thinking. Oxygen & capacity limitation of thermal tolerance oxygen capacity limits thermal tolerance. Oxygen supply (s) increases with: po2, efficacy of the respiratory system, cold water. Oxygen demand (d: scales with body mass and temperature (ectotherms) bigger body mass=more o2 demand. Tells you: oxygen availability, temperature, habitat availability (threshold)
