Why are so many marine organisms ectotherms
Answers:
Because it is too difficult to maintain an increased body temperature in water. Heat transfers much, much more quickly in water than it does in air thus meaning it requires a body to produce much more heat to stay at a stable temperature. Think about it this way, if it was 50 degrees outside, it wouldn't be very hard for you to go out with very little clothing on and stay outside for a protracted period of time. However, if you jumped into 50 degree water, you would very quickly become cold and soon develop signs of hypothermia. Marine animals avoid this by simply changing their body temperature to suit the surrounding environment. Some can keep their body temperature higher. Great Whites for example, to gain some of the benefits from a high metabolism. For marine mammals, the situation is a bit different. Since mammals, by nature, are warm blooded they have had to develop different ways to insulate themselves from the water. Some examples are blubber in whales and seals, and thick or waterproof fur/feathers like polar bears, otters, and penguins.
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