Lakes are bodies of water created by the rivers flowing into them.
Seasonal changes: Warmth is at the surface of the lake. The lake is heated during summer and grows warmer and colder in spring and fall, respectively. As winter approaches, lakes develop a layer of ice that can block oxygen. This is sufficient to be deadly for fish.
Food and life: Many animals have adapted to life in lakes in various ways. One example is planktonic algae. Planktonic algae produce highly drought-resistant spores.
Plankters that have to stay in the light zone or die have adapted with "gas bubbles.” They increase the diameter but not the mass of those "bubbles".
Water fleas are another example: During droughts and bad times, water fleas mate and produce thick-walled eggs. These eggs are more resistant to external forces, such as weather.
Relations: Relationships between animals are not only the normal bee-take-pollen-from-flowers examples that are frequently used to describe animal relations. Fresh sponges are green owing to the growth of algae. Another example is the special type of cichlid fish that feeds exclusively on the eggs of other cichlid fishes.
Flukes may also enter salmon, marine snails, and many other marine organisms, which is why we cook salmon before eating it.
Productivity: Productivity is one of the most important features of lakes. Productivity is generally highest during mid-summer (July and August) and decreases in winter. Midspring and midfall generally have approximately the same productivity, while late spring and late fall have more and less productivity, respectively. Productivity is one of the most important aspects of the diverse and beautiful ecosystems of lakes.
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