The effects of temperature and salinity on the early development of Adula californiensis (Pelecypoda-Mytilidae) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tt44pr704

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  • Adula californiensis, which inhabits mudstone along the open coast and in Yaquina Bay, Oregon, is subjected to extremely varying conditions. Laboratory experiments of a factorial design were used to investigate the effects of temperature and salinity on survival, growth and respiration during early development. The rate of development to the veliger stage increased from 7° to 20°C. A retardation of developmental rate and increase in abnormalities and mortality occurred with decreasing salinity from 33.2 to 20.4 ppt. Optimum conditions for survival were estimated by response surface techniques to occur between temperatures and salinities of 9°-16°C and 29-32 ppt for 3 day larvae, and 9°-15°C and 31-36 ppt for 15 day larvae. Statistical analysis indicated that the linear and quadratic effects of salinity were the more important factors affecting larval survival to 3 days of development, while survival of larvae to 15 days of development was most affected by the linear and quadratic effects of temperature. Preliminary survival data combined with the above 3 and 15 day data produced a better fitted response surface. Optimum conditions for survival were estimated to occur between l2°-l6.5°C and 28-32 ppt for 3 day larvae; and between 10°-15.5°C and 29-34 ppt for 13, 15 day larvae. Both the linear and quadratic effects of temperature and salinity were nearly equal in affecting survival to 3 and 13, 15 days of development. Larvae were reared to 3 days of development at optimum conditions (15°C, 32.2 ppt) and then transferred to experimental temperature- salinity combinations to determine the effect of these factors on later larval development. After 22 days of rearing, survival generally decreased with decreasing salinity but at a greater rate at the higher temperatures. There were no survivors at 20°C at any salinity and at 13,3 ppt at any temperature. Larval growth was not significant over 22 days of rearing and only small differences in mean lengths were measured for larvae reared in any temperature-salinity combination where there was survival. Oxygen consumption determined for 72 hour veliger larvae at various temperatures and salinities generally increased from 7° to 18°C and then sharply decreased from 18° to 21°C. The linear and quadratic effects of temperature were indicated by statistical analysis to be the more important factors affecting oxygen consumption. Since the early development of A. californiensis requires temperature and salinity conditions near oceanic for survival, successful recruitment of this species in Yaquina Bay depends upon the release of a large number of eggs at a critical period of optimum conditions.
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