. The emigrations of animals from the sea. Animal ecology; Animal migration. Fig. 14. A sunny pool in Florida where mosquitoes (Uranotaenia) breed. (Photo by R. H. Arnett, Jr.) ranges. As the radiant energy that is available on the surface of the earth comes largely from the sun and, because of the rotation of the earth on its axis, the supply varies regularly during every twenty-four hours, the activities of many animals are rhythmic. Nocturnal and diurnal animals have energy requirement levels which are adjusted to particular periods in the diurnal cycle. Among common pond fishes in the Unit
. The emigrations of animals from the sea. Animal ecology; Animal migration. Fig. 14. A sunny pool in Florida where mosquitoes (Uranotaenia) breed. (Photo by R. H. Arnett, Jr.) ranges. As the radiant energy that is available on the surface of the earth comes largely from the sun and, because of the rotation of the earth on its axis, the supply varies regularly during every twenty-four hours, the activities of many animals are rhythmic. Nocturnal and diurnal animals have energy requirement levels which are adjusted to particular periods in the diurnal cycle. Among common pond fishes in the United States the carp and mud min- now are most often active at night, the pumpkinseed during the day, and the cisco at all hours. Most locusts sing during the day; katy- dids and tree crickets, at night. Many cave live for genera- tions without light. Even mammals, such as horses in mines, appear to remain healthy for years in the absence of sunlight if fed proper food. Many animals have periods of rest and activity which are correlated with the changes in available energy which occur as the earth travels annually about the sun; , seasonal periodicities. There are many examples of what are known as spring, summer,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pearse, A. S. (Arthur Sperry), 1877-1956. Dryden, N. Y. , Sherwood Press
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