. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ENVIRONMENTAL EFFECTS ON MURICIDAE 43 death rate at each salinity was at 15° C. The highest mortalities of U. cinerea and E. caudata at this temperature occurred at 15%<? salinity (10 and 15%, respectively). At normal salinity and 15° C mortalities of the two species were lower (1 and 2%, respectively) than for any other temperature-salinity com- bination tested. At 20° C and salinity U. cinerea displayed 19% mortality and E. caudata 20%. Mortality at this temperature decreased with each increase in salinity and th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ENVIRONMENTAL EFFECTS ON MURICIDAE 43 death rate at each salinity was at 15° C. The highest mortalities of U. cinerea and E. caudata at this temperature occurred at 15%<? salinity (10 and 15%, respectively). At normal salinity and 15° C mortalities of the two species were lower (1 and 2%, respectively) than for any other temperature-salinity com- bination tested. At 20° C and salinity U. cinerea displayed 19% mortality and E. caudata 20%. Mortality at this temperature decreased with each increase in salinity and the lowest mortality at this temperature was at (r; U. cinerea, 2% and E. caudata, 3%. 40- •5 3° 20 - 10 '. 25'C U20-C. ]l5*C. nl 1 2 12 12 SALINITY (ppt) FIGURE 3. Mortalities of Urosalpinx cinerea (1) and Eitplcura caudata (2) at a series of controlled temperatures and salinities. The highest mortality at all salinities was at 25° C. At this temperature and salinity, U. cinerea and E. caudata exhibited mortalities of 34 and 41%, respectively—higher than at any other temperature-salinity combination tested. Again, the mortalities decreased as the salinity increased, and the lowest mortality at this temperature was at The ability of oyster drills to survive, particularly at low salinities, was mark- edly affected by temperature. Both species of drills exhibited progressively higher mortalities as the temperature was increased at each salinity, and at \ the mortality rates were approximately four times higher at 25° C than at 15° C (Fig- 3). These observations may explain the survival of drills in areas where seasonal fluctuations in salinity are wide. In late winter and early spring, when the salinity of coastal waters is lowest, the water temperature is still low enough for drills to withstand the low salinities for some time. E. caudata, however, was less tolerant. Please note that these images are extracted from scanned
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
