. The Biological bulletin. Biology; Zoology; Marine biology. ENVIRONMENTAL EFFECTS ON CRAB LARVAE 195 cent mortality occurred at low salinities ( ) and at high salinities ( , whereas in the intermediate salinities ( and ) some zoeae passed through all larval stages and metamorphosed to the first crab stage at all three temperatures. The constant conditions of temperature and salinity, used in the laboratory studies,, are obviously not found in the natural estuarine environments. If zoeae were hatched and retained in water of low or high salini- ties in natur
. The Biological bulletin. Biology; Zoology; Marine biology. ENVIRONMENTAL EFFECTS ON CRAB LARVAE 195 cent mortality occurred at low salinities ( ) and at high salinities ( , whereas in the intermediate salinities ( and ) some zoeae passed through all larval stages and metamorphosed to the first crab stage at all three temperatures. The constant conditions of temperature and salinity, used in the laboratory studies,, are obviously not found in the natural estuarine environments. If zoeae were hatched and retained in water of low or high salini- ties in nature, they might not survive. If, however, the vertical and horizontal water movements carried them to intermediate salinities, their chances of survival would be increased. An examination of Figure 7 suggests that optimum con- ditions of temperature and salinity exist for each larval stage of 5*. cinereum. Estimation of optimum conditions The salinity-temperature ranges for each larval stage of 5\ cinereum have been determined from laboratorv-reared material. If these same environmental limits o Ld oc D < cr u CL UJ. SALINITY Figure 8. Estimation of per cent mortality of first zoeal stage of Scsarma cinereum ba-ed on the fitted response surface to observed mortality under twelve different combinations of salinity and 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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