CAS BI 260 Lecture Notes - Lecture 10: Deep Sea, Marine Snow, Cold Seep
2 Mar 2020
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A regions i epipelagic photic zone light sufficient ii metapelagic dim light no photosynthesis iii peep sea no light. D low temperature not much variation between seasons. B majority of ocean relies on marine snow 1 detritus. No photosynthesis i as detritus falls it gets decomposed and oxygen gets depleted ii belowmesopelagic less decomposition less respiration and oxygen replenished by thermohaline circulation. A less than 590 of deep sea floor has been surveyed. D distribution of biomass less nutrients in deeper waters surface i marine snow production less overdeep waters ii primaryproduction takes longer to descend marine snow consumed in transit. A coral mounds i initiate when deep water corals colonize hard substrate ii not reefs iii dominated by stony and soft corals especially coral lophellia. B dead bodies but coral fragments and mud i large fish and whales die ii patchesgothrough successional sequence a scavenger stage carcass visited by sharks bony fish and crabs.
