Although ectotherms can tolerate large ranges in external temperature, they are unable to sustain large fluctuations in their internal temperatures.

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Ectothermic marine organisms have an internal temperature that stays very close to that of their surroundings. Endotherms are unable to tolerate large internal temperature changes despite their tolerance for external changes. Endotherms have developed various thermoregulatory mechanisms to live in a wide range of habitats. Information can be found in the section Marine Life Success Depends upon Physical and Biological Environmental Factors.

Although Ectotherms Can Tolerate Large Ranges in External Temperature, They