. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 RALPH I. SMITH close beneath the ice (unless they had migrated from deeper levels, an undemon- strated possibility). It is perhaps significant that the winter of 1953-54 was un usually free of snow, and it may be that the Krogarvik experienced little reduction of salinity at the spring thaw. I am informed by Professor Palmgren that the taking of salinity samples at the bottom of the Krogarvik will be resumed, and if the winter results can be correlated with the abundance of N. diversicolor in each following summer, it ma
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 338 RALPH I. SMITH close beneath the ice (unless they had migrated from deeper levels, an undemon- strated possibility). It is perhaps significant that the winter of 1953-54 was un usually free of snow, and it may be that the Krogarvik experienced little reduction of salinity at the spring thaw. I am informed by Professor Palmgren that the taking of salinity samples at the bottom of the Krogarvik will be resumed, and if the winter results can be correlated with the abundance of N. diversicolor in each following summer, it may be possible to determine from this natural experiment what salinities can be tolerated by these worms at winter temperatures. Studies of osmoregulatory ability under refrigeration in summer might be helpful, but probably not conclusive because of the ability of some animals to adjust their metabolism to seasonal changes in temperature; studies made in winter would be more informative. // r- -II I. FIGURE 2. Map of the Isefjord, 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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