Adaptivity to short-term and long-term changes in water temperature and salinity was studied in larvae of the bivalve mollusk Mytilus trossulus. It was shown that water temperature of 4°C mostly suppressed growth and development of larvae. A temperature of 20°C promoted an enhanced larval growth and development. Though a temperature of 20°C caused enhanced larval growth, the temperature was not optimal, while its effect caused quality diversity of larval development, owing to the difference in their growth rates. Such diversity was not observed at moderate temperatures of 10 and 15°C. At 20°C, fast-growing mussel larvae were very sensitive to temperature drops. Growth of slowly-growing individuals did not depend on temperature in the range of 10 to 20°C. Daily temperature variations by 3–8°C did not markedly affect growth and development of the larvae. A continuous 24-h exposure to temperature drops by 3–8°C did not influence these very important physiological characteristics either. A salinity drop down to 8‰ exerted an adverse effect only on early larvae. Later on, the larvae showed their ability to adapt to such a strong desalination. The negative effect of reduced salinity (to 8‰) upon mussel larvae was increased at a temperature increase to 20°C.
Russian Journal of Marine Biology – Springer Journals
Published: May 13, 2006
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