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Lecture

env100 note 35.docx

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Department
Environment
Course
ENV100Y5
Professor
murk
Semester
Winter

Description
ENV100 Lecture NotesJan 13 2012 Marine and Coastal Systems and Fisheries continued READING Chapter 12Coral reefshallow subtropical and tropical watersextremely biodiverse 25 of all marine species coralscolonial organisms related to sea anemones and jellyshsessile attach to substrate capture passing food with stinging tentaclessymbiotic algae called zooxanthallaereefs are composed of stony corals polyps secrete carbonate exoskeletons new polyps settle on existing reef provide habitat for many speciesprotect shorelineseconomically important tourism ecosystem services etcCoral reefs are in worldwide declinecoral bleaching response to changes in light level and water temperaturenutrient pollution causes algal growth smothers coral acidication of oceans removes carbonate ionsdamage from cyanide blast shing o blast shing using explosives to kill or stun sh for collection o extremely harmful to reefs o still a prevalent practicesalt marshesemergent plants on intertidal atscritical habitat for sh migrating birds lter pollution stabilize shorelinemangrove forestssalttolerant trees with aerial rootslter pollutants protect from storm surgesextreme biodiversity disappearing rapidly Estuarieswhere rivers ow into the oceanwide uctuations in salinity critical habitat for shorebirds and shellsh
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