BIO1042 Lecture Notes - Lecture 20: Photosynthetic Efficiency, Dna Replication, Oxidative Stress

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Bio1042 lecture 20 part 2 - life and diversity. Cascade to insects, birds and other animals: weeds, feral ungulates and rabbits will become more abundant = extra pressure on native taxa. Melting of permafrost in sweden and west siberia disappearance of 00s of pools and lakes (drained into thawed soil) total loss of flora and fauna. Forests sensitive to drought adversely affected by global warming. Impacts on insect populations. e. g. outbreaks of spruce bark beetles (formerly limited by cold) killed 2. 3 x 106 acres of alaskan forest since 1992. Largest loss of trees to insects ever recorded in north america. In june 2017, u. s. president donald trump announced his intention to withdraw the united. The role of atmospheric ozone: o3 a minor atmospheric component, both created and destroyed by uv light, o3 plays a critical biosphere role, by absorbing most ultraviolet light.

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