However it is suggested that the temperature and salinity combined, effect the ecological system the most. Below are all of the factors that I feel influence the location preference of the sea urchin. Although these organisms are capable of withstanding such harsh environmental conditions, there are factors that are essential to their survival. The two that probably have the most impact are the temperature and salinity of the water. Without the correct balance of either, death would result rather quickly.
Temperature is a critical factor in the existence of any organisms.
Virtually all bodily processes are affected by changes in temperature. Temperature is mostly affected by the nature of tide pools. Those pools that are higher in the intertidal region are more likely to become isolated and inaccessible to fresh sea water-which is cooler. Therefore, the water will slowly be hearted to a temperature that may cause the organisms to become in danger or die. This endangering of the tide pool life is not all attributed to the heat alone.