DEAD ZONES

A shark because it could swim out of the Dead Zone

A shark, crab and shrimp are in a Dead Zone who would survive?

Milligrams per liter

Typically dissolved oxygen is expressed as?

Agriculture (fertilizer), factory emissions, wastewater treatment or run off

3 activities that could lead to plankton blooms

Nitrogen

An excess of ____________ would be associated with the formation of a Dead Zone

November

Are there any months during which anoxic or hypoxia conditions don't exist?

Reduced fishing revenue because fish move away or died; reduced tourism

Economic impacts of Dead Zones?

DO= 0mg/L NO OXYGEN

How are anoxic conditions defined?

DO=<2mg/L DO content is less than two but above zero

How are hypoxic conditions defined?

Upwelling of deep ocean currents

The primary process by which carbon is returned to the surface waters from the deep ocean is?

6mg/L

What DO content is considered normal and supportive of marine life?

Dissolved Oxygen

What does DO stand for?

Excess nutrients (nitrogen & phosphorus)

What is a significant cause of Dead Zones?

Decomposition used dissolved oxygen, removing it from the water

What is the relationship between decomposition and dissolved oxygen?

Eutrophication

What term refers to an ecological imbalance by excess nutrients?

Summer (July-September)

When are low oxygen conditions worse?

August

Which month has the longest period of anoxic conditions?

Temperatures are highest in summer (lower solubility)

Why is summer likely to have low oxygen conditions?