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Seasonal and diel changes in the vertical distribution in relation to the age structure of Microcalanus pygmaeus Sars and Ctenocalanus citer Bowman & Heron (Psedocalanidae, Copepoda) from Croker Passage (Antarctic Peninsula)
Zmijewska, M.I.; Bielecka, L.; Grabowska, A. (2000). Seasonal and diel changes in the vertical distribution in relation to the age structure of Microcalanus pygmaeus Sars and Ctenocalanus citer Bowman & Heron (Psedocalanidae, Copepoda) from Croker Passage (Antarctic Peninsula). Oceanologia 42(1): 89-103
In: Oceanologia: Quarterly journal of basic research in marine sciences with emphasis on European seas. Polish Academy of Sciences, Institute of Oceanology: Wroclaw; Gdansk. ISSN 0078-3234; e-ISSN 2300-7370, meer
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  • Zmijewska, M.I., meer
  • Bielecka, L., meer
  • Grabowska, A.
Abstract
    The development of two representatives of Pseudocalanidae and the nature oftheir population distribution in the water column were investigated on the basis ofplankton samples collected over three seasons in night-day series in Croker Passage.The investigations showed that the two species begin reproducing in differentseasons. Regardless of season, the growth of M. pygmaeus is more advanced thanthat of C. citer. Both species are characterised by a separation of their populationsin the water column. The youngest copepodite stages (I-III) inhabit the upperportion of the water in which the given species occurs, while the oldest specimens,especially males, inhabit the deepest waters. Additionally, the first growth phases(CI-CIII) show a tendency to concentrate closer to the surface at night.
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