ENV 1101 Lecture Notes - Lecture 6: Pisaster Ochraceus, Coral Reef, Pisaster
13 Oct 2016
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Document Summary
Epigenetics is the study of heritable changes in gene expression (active versus inactive genes) that does not involve changes to the underlying dna sequence. The orders of magnitude drop, as you move closer to the larger animals/carnivores. When humans interfere with ecological systems, problems emerge (cid:498)(uman activities have initiated another mass extinction(cid:499) (cid:523)p. (cid:887)(cid:886)(cid:887)(cid:524) End ordovician, 444 million years ago, 86% of species lost. Late devonian, 375 million years ago, 75% of species lost. End permian, 251 million years ago, 96% of species lost. End triassic, 200 million years ago, 80% of species lost. End cretaceous, 66 million years ago, 76% of all species lost. Let"s look at some cycles that are immensely important. Human alteration of carbon placement is serious ** the rate at which these things happen is bad, and is the key problem. dissolved atmosphere fossilized. Phosphorous cycle & humans phosphorous is key in agriculture. Rate of modification: cycles that are billion years old, now being disrupted.
