Climate
The climate of a pond or a lake determines the conditions and likelihood of the survival of an organism. The temperature in ponds and lakes varies seasonally. During the summer the temperature can be 4 degrees Celsius near the bottom and 22 degrees Celsius near the top. In the winter a pond or lake can be 4 degrees Celsius at the bottom and 0 degrees Celsius at the top (at this point the pond or lake would be frozen). Whatever condition the organism does not prefer would be the condition that the organism is most likely to die from.