Renz, J. & H.J. Hirche. (2004). Life of Pseudocalanus acuspes in the Baltic Sea. ICES Journal Of Marine Science. CM 2004/L:20:1-11.
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Renz, J. & H.J. Hirche
2004
Life of Pseudocalanus acuspes in the Baltic Sea.
ICES Journal Of Marine Science
CM 2004/L:20:1-11.
Publication
Available for editors
Seasonal and spatial distribution of Pseudocalanus acuspes was studied from March 2002 to May 2003 in the Bornholm Basin of the Central Baltic Sea. During the same time, egg-production was de- termined by in-situ incubations.
Highest abundances were reached in May 2002 and April 2003 (618*103 and 869*103 n m-2, respec- tively), a peak in egg production rate was observed in April 2002 (3.6 female-1 day-1) and April 2003 (2.5 female-1 day-1). According to the hydrographic conditions, P. acuspes showed a pronounced onto- genetic vertical distribution. During spring, nauplii were distributed almost exclusively above the halo- cline, while older copepodites inhabited the lower part of the water column under the halocline. During summer, when the thermocline had build up, the ontogenetic vertical distribution was weak- ened but still existent. Highest proportion of the population was found in the water body between the thermo- and the halocline. During the year a clear stage shift from nauplii to older copepodites was seen, but proportion of adult stages never exceeded 19.5 %.
