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Dependence of temperature on loss rates of rotifers, lipids, and ?3 fatty acids in starved Brachionus plicatilis cultures by Yngvar Olsen; Kjell Inge Reitan; Olav Vadstein is a Environmental Science article available to read on EtoBox.

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Rotifer cultures of Brachionus plicatilis (SINTEF-strain, length 250 μm) rich in w3 fatty acids were starved for > 5 days at variable temperature (0-18 'C) . The net specific loss rate of rotifer numbers were 0.04 day -' (range 0-0 .08 day -1) at 5-18 °C, but reached values up to 0 .25 day -1 at 0-3 °C . The loss rate was independent on culture density (range 40-1000 ind ml"'), but was to some extent dependent on the initial physiological state of the rotifers (i .e ., egg ratio) . The loss rate of lipids was 0 .02-0 .05 day -1 below 10 °C, where the potential growth rate of the rotifer is low (0-0 .09 day') . The loss rate of lipids increased rapidly for higher temperatures where the rotifer can maintain positive growth, and reached 0 .19 day -' at 18 °C . The Q 10 for the lipid loss rate versus temperature was higher than the Q 10 for respiration found in other strains . This may suggest that other processes than respiration were involved in lipid catabolism . The content of w3 fatty acids became reduced somewhat faster than the lipids (i .e . in particular 22 :6 w3), but the fatty acid per cent distribution remained remarkably unaffected by the temperature during starvation . Th

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Author

Yngvar Olsen; Kjell Inge Reitan; Olav Vadstein

Publisher

Springer; Springer-Verlag; Springer (Kluwer Academic Publishers); Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 1573-5141)

Published

1993

Language

EN

Field

Environmental Science (Physical Sciences)