Abstract
Female Calanus glacialis were collected in early May 1989 in the pack ice region of the western Barents Sea and were fed or starved over 11 wk. Both groups laid eggs continuously during this period, however, fed females laid up to six times more eggs. During the first 10 d after collection, both groups spawned at low rates. There-after, fed females strongly increased spawning rates and maintained high egg production levels over 11 wk, while the rates of starved females decreased. During starvation they lost 70% body carbon, 50% body nitrogen and 70% lipids. The wax ester portion decreased from 86 to ca. 60% of total lipids. Three phases of gonad development and lipid metabolism were distinguished: early gonad development; gonad maturation with a rapid decrease in lipids, especially wax esters; and spawning under fed and starved conditions, where in fed females food provided most of the energy, whereas in starved females the lipid content strongly decreased.
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Communicated by O. Kinne, Oldendorf/Luhe
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Hirche, H.J., Kattner, G. Egg production and lipid content of Calanus glacialis in spring: indication of a food-dependent and food-independent reproductive mode. Marine Biology 117, 615–622 (1993). https://doi.org/10.1007/BF00349773
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DOI: https://doi.org/10.1007/BF00349773