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JPR Advance Access published online on June 3, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh099
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Received February 16, 2004
Accepted May 26, 2004

Article

Seasonal variability and inter-specific differences in hatching of calanoid copepod resting eggs from sediments of the German Bight (North Sea)

M. Engel 1* H.-J. Hirche 1

1 Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 27568 Bremerhaven, Germany

* To whom correspondence should be addressed. E-mail: mengel{at}awi-bremerhaven.de.


  Abstract

Hatching experiments were conducted on sediment samples collected on 7 cruises between March 2002 and February 2003, at four stations near Helgoland (54°11'N, 7°53'E). Samples were incubated for up to 12 months and examined weekly for calanoid copepod nauplii. 12807 nauplii hatched in total. Of these 36.43% were stage N1 (pooled), 44.08% were Temora longicornis (stage N2 and older), and 17.96% were Centropages hamatus (stage N2 and older). Some Acartia spp. and an unidentified species were found, too. Hatching varied significantly between sampling dates. At three stations, counts of all nauplii peaked in samples taken in April, while at one station the maximum was recorded in the sample collected in October. The seasonal pattern of hatching was similar in T. longicornis and C. hamatus. In March, April, October, and February numbers of all nauplii were initially low, but increased over the following two to three weeks. In June, August and December, however, average numbers were comparatively high at first, but declined thereafter. In 3 of the 4 samples that were incubated for 12 months nauplii hatched from the sediment for the entire experimental period. T. longicornis and C. hamatus displayed clearly distinct patterns of hatching in these long-term incubations.


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