Abstract
THE letter from Dr. Hem Singh Pruthi on this subjectl is of much interest, but one feels doubtful whether the comparative absence of insects from the oceans can be accounted for simply on the ground of calcium deficiency. Even supposing that the remarkable instance of the Clœon larva, which he cites, is to be connected with the unusually high concentration of calcium in the waters of the Salt Range, there remains the fact that many species of Coleoptera (Dytiscidæ, Hydrophilidæ), as well as Hemiptera (Corixidæ) and Diptera, have been recorded from waters of a salinity equal to or greater than that of the sea, but in which the proportion of calcium was no higher.
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References
NATURE, 130, 312, Aug. 27, 1932.
Thorpe, W. H., 1927: "The Fauna of Brackish Pools of the Sussex Coast.", Trans. S.E. Union of Scientific Societies, 1927, pp. 27–34.
Thorpe, W. H., 1931: "Miscellaneous Records of Insects Inhabiting the Saline Waters of the Callfornian Desert Regions", Pan-Pacific Entomologist, 2, 145–153.
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THORPE, W. Colonisation of the Sea by Insects. Nature 130, 629–630 (1932). https://doi.org/10.1038/130629d0
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DOI: https://doi.org/10.1038/130629d0
