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What is a community
A group of interacting organisms of different species sharing a common living space
Has a standing biomass per unit of surface area is the highest among any marine community
Typically has brackish water
Is where freshwater and seawater mix
There is no photosynthesis occurring in the deep water because of the permanent darkness. For the most part, consumers rely on the biological activity above them for nutrients.
What process re-establishes climax communities after a major disruption in the environment?
This community is named the deep scattering layer due to its tendency to reflect sound pulses which make it appear like a false bottom to people above. The scattering layer itself is comprised of a dense population of fish, squid, and other vertical migrators.
Deep Scattering Layer
Why was the feeding strategy of giant tube worms, Riftia, such a mystery to scientists when they were first discovered?
These worms have no mouth.
These worms have no digestive tract.
These worms have no anus.
Characteristics of deep water animals
Deep water organisms tend to move slowly.
Deep water organisms require little food to survive.
Deep water organisms have a high metabolic rate.
Deep water organisms tend to have a long life span.
Wave shock is a not a problem for intertidal organisms. It gently bathes the area around them and exerts very little force on the organisms.
What tools do fishermen now employ to locate schools of fish?
What marine resource has been rendered uneconomical due to the high cost of extraction?
What is bycatch?
Organisms unintentionally killed during the harvesting of a different, desirable species
Who is responsible for the consumption of approximately a quarter of the global oil supply?
Many harvested marine animals are sustainable because they are being caught below the maximum sustainable yield
False; 90% disappeared in last 50 years
Nonrenewable resources are unable to be replenished over short time spans. These resources include oil, gas, and solid mineral deposits
Algin is a biological resource extracted from seaweed and is an important commercial product used:
to stiffen fabrics
as a thickener or emulsifier
to prevent large crystals in ice cream
to clarify beer and/or wine
An unintentional but unavoidable consequence of drift net fishing is the drowning of larger non-target species such as sea lions, sharks, and other large animals
What determines an organism's response to a particular pollutant?
The quantity of the pollutant
The toxicity of the pollutant
The persistence of the pollutant
What happens when corals exceed their normal temperatures for too long of a period of time?
Corals eject their zooxanthellae
How do the insoluble components of oil affect the ocean?
Prevent free diffusion of gas
Clog feeding structures Decrease the amount of light penetrating the surface
What is favorable news associated with global warming—perhaps one of the few advantages?
The Northwest Passage may open
The acceptance of global energy change is difficult because fossil fuels power most of the world economies
The depletion of the ozone layer near the poles had a major impact on the productivity of plankton. This is because the plankton was receiving too much
In some cases, areas where oil spills were cleaned had communities in worse shape than in areas where an oil spill was left alone.
There is an area is the North East Pacific where plastic has been accumulating for a long time and has come to be known as:
The East Pacific Garbage Patch
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