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S8: Section 3.2 & 3.3-Pop. in Fresh & Salt Water; Water Quality & Living Things

Last updated over 3 years ago

13 questions

1

Prairie lakes with high concentrations of carbonates and bicarbonates have white coatings on
the rocks near the shoreline. These minerals have been dissolved out of the soil and have
made the lakes ...

1

Brine shrimp are microscopic organisms that live in salt lakes and brine ponds. Few other
organisms can live in these environments because the environment is so ...

1

Which of the following environments would have the greatest diversity?

1

Often when too many chemicals are added to an environment, pollution occurs. This is
evident when fertilizer runoff from farmer’s fields increases the growth of green slime in a body
of water nearby. This green slime is called ...

1

A population is related to a species in the following way ...

8

The cod population off the east coast of Canada was once so huge that ships came from all over the
world to fish there. When John Cabot – an explorer, arrived in the waters of Newfoundland, he wrote
that there were so many fish in the water that the boat could only move slowly. Today, there are so few cod that fishing for them has become very carefully controlled by regulations and catch limits. Over-fishing may not be the only cause of the decline in the cod population within the Grand Banks. There are more than 40 possible reasons that could explain the decline in cod stock recovery, including:
The environment, Fish growth and survival, Reproduction Issues, and Seals, (feeding on the cod), have also been suspected as a "possibility", that they are "preventing recovery of the cod stock."

What do you suggest could be done to protect the cod stocks in the Grand Banks?
What else should be done to increase the population?

1

The study of populations looks at groups of organisms within a particular species. A population
is a group of organisms of the same species that live in...

1

Population changes can occur because of a number of factors. Extremes in temperatures occur
because of these types of changes ...

1

These types of population changes can occur naturally but do not happen every year ...

1

Zebra mussels, introduced into the great lakes in 1988, is an example of this type of population
change ...

8

When populations or species die off, or when they’re unhealthy, it’s a sign that something in the ecosystem has changed. Provide at least four changes that could have affected the ecosystem and explain how those changes would be detrimental to the ecosystem.

8

All throughout the months of our long, cold winter, snow and ice build-up on the streets and sidewalks of Calgary and Edmonton. Animal waste, oil, antifreeze, and road salt collect in this snow. When spring finally arrives, snow and ice rapidly melt. How might this meltwater affect populations of aquatic organisms downstream from these cities?

8

What does "Thermal Pollution" mean? How would it affect an ecosystem?