Exam 30: Microorganisms in Marine and Freshwater Ecosystems

In marine and freshwater environments,the penetration of sunlight and the mixing of nutrients,oxygen,and waste products are the dominant factors controlling the microbial community.

In general,cyanobacteria prefer higher pH and temperature conditions than algae.

Barophilic bacteria

Cyanobacteria such as Synechococcus and Prochlorococcus are predominate members of the phytoplankton in illuminated surface waters.

Thiomargarita species store large amounts of ____________ in huge internal vacuoles.

When direct examination of virioplankton is carried out by transmission electron microscopy,the numbers obtained are reported as

In the open ocean,

Water ecosystems become eutrophic when there is

Which of the following keep the lakes of the East Antarctic Ice Sheet in a liquid state?

The solubility of oxygen in water will change in which way when the water temperature is lowered?

The buffering effect of the balance between carbon dioxide,bicarbonate,and carbonate is stronger in freshwater than it is in the marine environment.

Microbes within glaciers are

Marine microbes inhabit sediments on the ocean floor at a depth of up to at least

The oceans contain about ____ percent of the earth's water.

In the ocean,organic matter sinks from the surface to great depths as

In which of the following types of waters do seasonal climatic temperature changes result in distinct chemical and microbial stratification?

Estuaries feature a characteristic salinity profile called a(n)_________ _________ .

What fraction of all of the organic carbon on earth results from microbial fixation of carbon dioxide in the oceans?

Viruses in the marine environment (virioplankton)are very abundant.

Winogradsky columns