Class Notes (834,818)
Canada (508,737)

One Ocean- Footprints in the Sand.docx

3 Pages
Unlock Document

Life Sciences
Luc Bernier

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
More Less

Related notes for LIFESCI 2H03

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.