human impacts on our coral reefs global warming sedimentation over-fishing careless recreation part...
TRANSCRIPT
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Human Impacts on Our Coral Reefs
Global Warming
Sedimentation
Over-Fishing
Careless Recreation
Part 3
Pollution
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What is sedimentation?
Sedimentation occurs when sediments found on land (soil, silt, & sand) enter the ocean
and cause the water to become very murky
Sed
imen
tati
on
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How does sediment travel?S
ed
imen
tati
on
Wind
Runoff
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What are human causesof sedimentation?
• Clearing land for homes, resorts, & other buildings
Sed
imen
tati
on
• Harbor construction• Agriculture• Dredging
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How does sedimentation threaten the coral reef habitat?S
ed
imen
tati
on • Smothering coral when particles settle out
• Reducing light availability which reduces coral photosynthesis and growth
• Sedimentation increases nutrients which allow algae overgrowth on coral
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Over-fishing is when people take more fish from the ocean than the ocean can produce
Ove
r-F
ish
ing
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Why do people over-fish?O
ver-
Fis
hin
g
Entertainment & Sport
Aquariums
Food
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How do people over-fish?O
ver-
Fis
hin
g
longlines
dynamite & poisons
gillnets
Photo courtesy of M
onterey Bay A
quarium F
oundation
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Over-fishing threatens the coral reef habitat
• Fish caught too young cannot grow old to reproduce and contribute to fish population
• Fewer fish are available to provide food for other marine organisms
• Some fish eat algae and where there are less of these fish, algae grows too thick and smothers the reef
Ove
r-F
ish
ing
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How do people use the reef for recreation?
Care
less
Recr
eati
on
snorkeling
diving
surfing
boating
fishing
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How are people careless with the reef?
Care
less
Recr
eati
on
• Kicking, touching, or standing on coral
• Boats can drop anchor or drive across shallow coral
• Abandoning fishing gear
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What can you do to protect the reef?
• Don’t touch the coral or any other animals
• Do not drive your boat over coral
• Only drop anchors in sand or other non-coral sediment
• Educate others!
Care
less
Recr
eati
on
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Pol
lutio
n
Human’s cause many forms of pollution that harms or kills coral.
Lost fishing gear (ghost gear)
Raw sewage Trash that settles on coral will kill it
Oil can kill all forms of sea life
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What is global warming?
Global warming is the increase in the temperature of the Earth’s air and oceans.
Glo
bal
Warm
ing
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What causes global warming?
Global warming happens when more carbon dioxide enters the atmosphere than can be removed by plants
Glo
bal
Warm
ing
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Human sources of global warmingmany types of transportation
factories
anything that uses fossil fuels!
Glo
bal
Warm
ing
deforestation
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How does global warming affect the coral reef habitat?
Glo
bal
Warm
ing
Bleaching is a result of warm sea-surface temperatures
Increases in water temperature can kill marine organisms not adapted to the warmer temperatures
healthy coral bleached coral
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The End