Abstract
Abundance and distribution of calanoid resting eggs in sediment were examined in 1988–1989 in an enclosed marine basin (Svartatjønn; western Norway). The basin undergoes rotenone treatment and draining every winter. Egg densities were highest in autumn, when up to 2 × 106 eggs m−2 were found, and lowest in summer. Egg densities were also highest in the deeper parts of the basin and in the upper 1 cm of sediment. Hatching was initiated in late January by pumping warmer deep water from the outside area into the basin. Evidence is given for resting-egg formation inEurytemora affinis Poppe, 1880 andAcartia clausi Gurney, 1931 (present phenotype reclassified asA. teclae by Bradford 1976: N. Z. Jl mar. Freshwat. Res. 10: 159–202). Seasonal differences in inhibition of hatching, together with the longevity and tolerance of these eggs, strongly suggest that they are diapause eggs.
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Communicated by T. Fenchel, Helsingør
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Næss, T. Marine calanoid resting eggs in Norway: Abundance and distribution of two copepod species in the sediment of an enclosed marine basin. Mar. Biol. 110, 261–266 (1991). https://doi.org/10.1007/BF01313712
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DOI: https://doi.org/10.1007/BF01313712