Exercises page 251

a) The water in the lake is becoming saline due to the new channel which connects to the ocean.
b) The temperature of the water in the lake is most likely due to global warming.
c) There is very little water entering the lake because of the new damn build on the upper reaches of the river which reduces the flow of freash water that is used to flush out the lakes system. There is also very little rain running down from the hills in dry weather.
d) The algal blooms have been due to the ecxess of phosphates from nearby farms which cause the algea to grow rapidly. There is also an ecxess of food as the forests have been cleared killing the animals which now provide food for the algea.
e) The clearing of vegitation has caused soil to run into the stream as there are no roots to hold the soil in place which then causes the creeks to silt up.

Ross