Why can cyanobacteria survive in nutrient poor water?
They are nitrogen fixers, gaining nitrogen from N2 gas dissolved in the water.
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15
The microbial loop is sometimes referred to as a food web within a food web. Why?
The microbial loop is a small food web that utilizes DOM that leaks out of other organisms.
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15
What happens in tropical regions where it doesnât cool, has a distinct thermocline and doesn't have a steady wind blowing?
limited mixing
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15
Why did scientists in the past believe that diatoms and dinoflagellates were the main source of primary production in the open ocean?
because standard plankton nets did not catch any of the microplankton.
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15
What are two major strategies planktonic species use for staying afloat in the epipelagic?
They either create drag and or use a gas or air bubble to create buoyancy
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15
What is so beneficial about cyanobacteria?
They are picoplankton that are nitrogen fixers.
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15
Larvaceans are important predators in the epipelagic, as well as providing an important food source for other organisms. What do they eat and what do they provide?
a. they eat the pico and nano plankton b. they produce and shed mucous coverings many times as they grow.
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15
The violet shell is a predator that suspends itself upside down at the surface of the water using air-filled bubbles. What type of organism does it feed on? Plankton, nekton or neuston?
neuston
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15
What is the difference between the prefixes 'mero" and "holo"?
"mero" means part and "Holo" mean whole
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15
What is a Pteropod? What does Pteropod mean?
a member of the Mollusca phylum, it means winged foot
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15
Why are picoplankton important for the cycling of nutrients in the epipelagic?
They eat the DOM and in turn are eaten, bringing the organic material in the DOM back into the food web.
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15
Why is primary production so much higher near the equator?
Constant wind blowing parallel to the equator, which pushes surface water away, bringing up nutrient rich deep water up to the surface,
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15
What is the most common reason for vertical migration?
nocturnal vertical migration, organisms ascend to the surface around dusk, remaining at the surface for the night to feed