coral reef bleaching

Coral Reef Bleaching

PPT By: Andrea Bonde

Location, Location, Location

•Covers over 284,300 square kilometers of Earth’s surface.•No coral reefs on the west coasts of America and Africa because of upwelling and cold currents.

• Biodiversity/Ecosystem•Plethora of animals and

plants live within and around Coral Reefs.• Zooxanthellae are a

very important symbiotic relationship.

Tropical Rainforest of the Ocean

Zooxanthellae•Fixed Carbon

Compounds• Symbiotic Relationship

• Photosynthesis•Energy, enhanced

calcification, elemental nutrient flux.•Provide color

*Coral Reefs provide protection and steady supply of carbon dioxide.*

10 6 zooxanthellae cm 2

Degradation• Anthropogenic:o Overexploitationo Overfishingo Increased

sedimentationo Increased nutrient

overload• Natural Causes:o Violent Stormso Floodingo High and Low

temperature extremes

Ecological Causes• Temperature• Solar Irradiance• Subaerial Exposure• Sedimentation• Fresh Water

Dilution• Inorganic Nutrients

• Xenobiotics• Epizootics

BleachingTwo main causes:

- - Density of zooxanthellae declines- - Photosynthetic pigments in zooxanthellae fall

-- 60-90% of zooxanthellae lost-- 50-80% of zooxanthellae loose photosynthetic pigments

Can it get better?

• If not too severe they can recover in weeks-months. • If zooxanthellae loss is prolonged, the coral host

eventually dies.

Hypothesis3 main hypothesis:

o High temp and irradiance stressors cause enzyme

disruption in zooxanthellaeo Photosynthesis pathways

are impaired at temps above 30*C

o Low and High temps cause cell adhesion dysfunction in

zooanthellae

o This is an adaptive mechanism

Future Hope

Works Cited

Buchheim, Jason. "Coral Reef Bleaching." Marine Biology With Odyssey Expeditions - Tropical Marine Biology Voyages!. N.p., n.d. Web. 12 Feb. 2013. <http://www.marinebiology.org/coralbleaching.

htm>."Coral Bleaching on the Great Barrier Reef." reefED - Educate to keep it Great. N.p., n.d. Web. 12 Feb. 2013. <http://www.reefed.edu.au/home/explorer/hot_

topics/coral_bleaching/coral_bleaching_on_the_great_barrier_reef>."Images." Earn Reward Points and Redeem Them For Free Stuff at Swagbucks.com. N.p., n.d. Web. 5 Feb. 2013. <http://www.swagbucks.com/>.

coral reef bleaching

Education

Transcript of coral reef bleaching

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Coral Reefs, Climate Change and Coral Bleaching ... 2 PDF/3-Aileen Velazco-Dominguez.pdfPR included extensive partial coral mortalities and some total mortalities of coral reef organisms,

NOAA Coral Reef Ecosystem Research Plan Part II: Regional ... · Develop early warning systems for coral reef bleaching based on known or predicted relationships with environmental

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