Environmental Science Chapter 7 Aquatic Ecosystems

Oligotrophic lakes or ponds have clear water with little nutrients, and high amounts of oxygen.

Where freshwater from rivers mixes with salt water from the ocean; part of a river where the tides meet river currents

What mainly distinguishes nekton from benthos?

zooplankton

Photosynthetic organisms are found mainly in shallow water due to the availability of

Which of the following is not a threat to coral reefs?

Water ________ sunlight; thus photosynthesis in lakes and oceans does not occur below 100 meters.

In estuaries fresh water and salt water mix, forming a(n)

The type of plankton that produces most of the food in an aquatic ecosystem is called

An area of land that is periodically underwater or whose soil contains a great deal of moisture.

What causes most coastal pollution in the United States?

What is the source of most ocean pollution?

Estuaries are very productive ecosystems because they receive fresh nutrients from

A limestone ridge found in tropical climates and composed of coral fragments that are deposited around organic remains

All the following are examples of saltwater ecosystems except

worms

During eutrophication of a lake, number of bacteria increase which use the oxygen, what will happen to fish in the lake?

Most of the nutrients in an arctic ecosystem come from

phytoplankton

whales

Which of the following statement is not correct?

Eutrophic lakes or ponds have dark murky water with much nutrients, and low amounts of oxygen.

In which aquatic zone would you be likely to find cattails and reeds?

which ecosystem has the highest level of salinity?

In the _________ zone, the water is cool and dark.

mussels

An estuary functions as a mineral trap due to

What happens to lakes when runoff from farms add nutrients into the water?

The bottom region of oceans and bodies of fresh water

Mass of mostly microscopic organisms that float or drift freely in waters of aquatic (freshwater & marine) environments.

The arrangement of organisms in the open ocean is determined by the

An increase in the amount of nutrients, such as nitrates, in a marine or aquatic.

The types of organisms found in a pond or lake depend on

Which aquatic ecosystem is adversely affected by runoff?

Organisms that live at the bottom of oceans or bodies of fresh water

In the __________ zone, aquatic life is diverse and abundant.

barnacles

In which of the following aquatic ecosystems are both littoral and benthic zones most likely found?

What are the two main types of freshwater wetlands?

Why are many of the world's largest cities built on estuaries?

Why doesn't photosynthesis occur in deep ocean water?

Fish

Tropical/subtropical marine swamp that is characterized by abundance of low to tall trees, especially mangrove trees.

Organisms that live in estuaries must adapt to changes in

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

A shallow zone in a freshwater habitat where light reaches the bottom and nurtures plant.

turtles

Two threats to ocean ecosystems are

A long ridge of sand or narrow island that lies parallel to the shore

The majority of marine organisms are found in

Which of the following is not characteristic of salt marshes and mangrove swamps?

Swamps are commonly found on

Which of the following factors is not an important advantage for aquatic organisms living near surface of a lake or pond

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

Maritime habitat charcterized by grasses, sedges, and other plants that have adapted to continual, periodic flooding

Most pollutants that enter estuaries break down over time, yet they are still considered a problem because

Which of the following is not an environmental function of wetlands?

All organisms that swim actively in open water, independent of currents.

Estuaries