. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORBICULA AERIAL EXPOSURE 255 Table I Median tolerance limes, lime elapsed (hours) to 50% mortality as determined by prohit analysis. /orCorbicula fluminea under various conditions of temperature and relative humidity Median tolerance times (hours) relative humidity Temp. 33? 53? >95% 15°C A 248. 5 A A B 25°C 72. 2 A 7 A A A 75. 6 A 35°C A A A A A Different letters within a temperature treatment (rows) indicate non- overlap of 95% fiducial limits between thos
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORBICULA AERIAL EXPOSURE 255 Table I Median tolerance limes, lime elapsed (hours) to 50% mortality as determined by prohit analysis. /orCorbicula fluminea under various conditions of temperature and relative humidity Median tolerance times (hours) relative humidity Temp. 33? 53? >95% 15°C A 248. 5 A A B 25°C 72. 2 A 7 A A A 75. 6 A 35°C A A A A A Different letters within a temperature treatment (rows) indicate non- overlap of 95% fiducial limits between those relative humidity treat- ments. an approximately threefold increase in TLm with every 10°C decline in temperature. At 15°C, theTLm'sat 75% and at 95% RH were significantly different (P < ) from one another and both were higher than those at the other relative humidities. No such relationship of rela- tive humidity to TLm was found at either of the other temperature treatments. During emersion, C. fluminea displayed three catego- ries of behavior. The first was simply the closed condition with valves tightly shut, displaying no tissue directly to the environment. The second behavior was that de- scribed by McMahon (1979) where the leading edge of the mantle tissue is protruded past slightly gaping valves so that moist tissue is exposed. This mantle edge expo- sure behavior has been linked to possible aerial oxygen uptake (McMahon and Williams, 1984). Under condi- tions of lower relative humidity the exposed tissues may appear dry, or a hardened mucus may form between the parted valves. Clams displaying these conditions also were scored as exposing mantle tissues. The third cate- gory of behavior was a complete or partial emptying of the mantle cavity water store. This was evidenced at higher humidities by a pool of fluid around the animal. At lower humidities the fluid may have dried, but evi- dence in the form of dried matter around the animal was an indication th
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
