Geog_101_Nov_23-1

Geog_101_Nov_23-1 - Before bottom trawling Human Impacts...

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Before bottom trawling Human Impacts Human Impacts on the on the Marine Environment Marine Environment After bottom trawling Accidental ‘bycatch’
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1. Assessment: threats to world’s coral reefs 2. Map showing ‘reefs at risk’ Risk factors identified for coral reefs also oceans generally
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Global distribution of coral reefs
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The Reefs at Risk Indicator Low Low Medium Medium High High
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Results 1. 60% reefs at risk from human activities Rapid decline in some areas 2. High biodiversity reefs most threatened 3. Human population density correlated to reef risk
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Coral reefs 101 Biodiversity Food 20% of all animal protein consumed by humans Medical treatment infections, skin cancer, bone grafts Tourism “Ecosystem Services” Nurishes for fishes Erosion protection Beach norishment 0 1000 2000 3000 4000 5000 6000 7000 Coral Reefs Tropical Forests Temperate Forests Value of Ecosystem Services ($/HA/YR)
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1. Overexploitation (fishing Areas at High Risk Cyanide fishing “Bomb” fishing Anchor damage
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Scrape marks: bottom trawling in seasgrass beds Trawlers
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2. Coastal development .
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Geog_101_Nov_23-1 - Before bottom trawling Human Impacts...

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