Ch. 7 Aquatic Ecosystems Review

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Because water_____ sunlight, photosynthesis is limited to the upper 100 meters of the ocean

absorbs

what is the source of most ocean pollution?

activities on land

Estuaries

are ecosystems where both fresh water & salt water are present

what are the two main types of freshwater wetlands

marshes and swamps

Free-swimming organisms

nekton

as they flow down a mountain to flatter ground, rivers generally become

slower, warmer, wider

Many rivers originate from ___ in mountains

snow melt

the types of organisms found in the pond or lake depend on

temperature of water, amount of sunlight, presence of nutrients

Coral reefs are intricately shaped rocklike structures that are formed as a result of

the secretion of calcium carbonate by tiny marine animals

Corals live only in shallow, ___ water where there is enough light for photosynthesis

warm

which of the following is NOT characteristics of wetlands?

wetlands are limited to inland freshwater environments

Why doesn't photosynthesis occur in deep ocean water?

There is no sunlight.

Long, thin ____________________ islands typically run parallel to a shore.

barrier

in the____zone, the water is cool and dark

benthic

bottom-dwelling organisms

benthos

marine ecosystem...

coral reef

a_____ lake has a large amount of plant growth due to nutrients

eutrophic

Which of the following is NOT an environmental function of wetlands

increasing runoff

what causes most coastal pollution in the U.S.

industrial waste and sewage

threats to the ocean ecosystem are

nutrient runoff & industrial waste discharges This is a wrong answer, overfishing & entanglement of marine mammals in nets This is a wrong answer, sewage and algal blooms This is a wrong answer

Which organisms produces most of the food in an aquatic ecosystem

phytoplankton

Estuaries are very productive ecosystems because they receive fresh nutrients from

rivers and oceans

Excessive nutrient growth in an aquatic ecosystem can be accelerated by

runoff

the amount of dissolved salts in water.

salinity


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