ECOL 3505H Lecture Notes - Lecture 23: Cambrian Explosion, Eutrophication, Hectare
27 Oct 2016
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Document Summary
N and p take different forms in different environments according to the age of the ecosystem. Colonies of millions of ants coexist with n-fixing bacteria. Salmon migrate 1000s of km to spawn, as adults they live in the oceans and then they stop eating once they begin migrating upstream. Eutrophication, for example in the mississippi, creates waters with suspended ions and alive and dead organic matter. This organic matter like phytoplankton (carbon) is reduced and used as energy by microbes. Decomposition of organic material and lack of oxygen, creates zones of hypoxia in the gulf of mexico. Therefore, shri(cid:373)p (cid:272)a(cid:374)"t li(cid:448)e i(cid:374) the o(cid:272)ea(cid:374) a(cid:374)d the e(cid:272)o(cid:374)o(cid:373)(cid:455) i(cid:374) this area (cid:272)ollapses. ***a lot of fertilizers by us creates a lot of dead organic matter excessive oxygen fixation hypoxia. There were whale predators 400 million years ago. A lot of the modern phyla which populated the sea occurred during the cambrian explosion 530 million years ago.
