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One Ocean- Footprints in the Sand.docx

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Department
Life Sciences
Course
LIFESCI 2H03
Professor
Luc Bernier
Semester
Winter

Description
March 25 , 2013 Life Sci 2H03: Environmental Life Sciences One Ocean: Footprints in the Sand Mediterranean Sea - blue finned tuna - Bluefin travel to warm coastal waters to spawn - Fisherman await their arrival - Fishing technique: almadra fisherman bring their nets and boats close together - Catch has drop by 80% in the past two decades - Large scale organized fishing was a feature of the roman empire: over fishing was also an issue, however, today’s global market is more demanding - 1990: japan buys as much tuna as it can, almost all of the world’s tuna ends up here - highest prices of any fish in the world - spotter plans relays information to boats – illegal fishing, causing an even greater decline - fished out ¾ of the breading population in the last half century - no one knows how the absence of Bluefin tuna will impact the ecosystem - just one example of overfishing in the Mediterranean - growing populaitona nd growing demand for fish - Mediterranean is one of the most stressed economy in the world Nile Delta - Egyptian lagoon - One of the largest delta’s in the world the Nile delta, has sustained fishing over the years - Abundance of fish - Coastal sprawl is shrinking the lagoon - Wetlands have been cut-off from the Mediterranean due to development - With no renewal of water there is an increase in vegetation due to increase of nutrients - Less oxygen in these waters as sewage and fertilizers are creating a dangerous situation - Oxygen is essential and makes it possible for sea life such as crab and fish to live; without it they die - Overpopulation: abundance of fish is coming to an end Gulf of Mexico - dead zone - no birds, sharks or fish, no life at all in this zone - one of the largest human caused dead zones - Nancy: measures oxygen content - Dead zones occur wherever oxygen is depleated below the necessary to sustain life – hypoxia - Mississippi brings nutrients to Gulf of Mexico creating algal blooms that use up oxygen when they decompose - Creatures that can swim can survive, those who can’t die as they can no longer breath, the water has become toxic - Hydrogen sulphide is toxic to animals as there is no oxygen - Has grown to 22 thoudand square kilometers - Discovered in
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