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Vertical distribution, grazing and egg production of calanoid copepods during winter-spring in Gullmarsfjorden
Titelman, J.; Tiselius, P. (1998). Vertical distribution, grazing and egg production of calanoid copepods during winter-spring in Gullmarsfjorden. Hydrobiologia 375-376: 343-351
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Titelman, J.; Tiselius, P. (1998). Vertical distribution, grazing and egg production of calanoid copepods during winter-spring in Gullmarsfjorden, in: Baden, S. et al. (Ed.) Recruitment, Colonization, and Physical-Chemical Forcing in Marine Biological Systems: Proceedings of the 32nd European Marine Biology Symposium, held in Lysekil, Sweden, 16-22 August 1997. Developments in Hydrobiology, 132: pp. 343-351, more

Available in  Authors 
Document type: Conference paper

Keywords
    Algal blooms; Fecundity; Food consumption; Food webs; Population dynamics; Vertical distribution; Zooplankton; Copepoda [WoRMS]; ANE, Sweden [Marine Regions]; Marine

Authors  Top 
  • Titelman, J.
  • Tiselius, P.

Abstract
    The vertical distribution of copepods in relation to their potential food was examined in Gullmarsfjorden, Sweden (58° 15.6prime N, 11° 27.2prime E). Plankton distributions were determined from bottle samples at 5 m intervals on four occasions; 30 January, 28 February, 7 March and 10 April 1996. Potential food was crudely divided into chlorophyll containing protists (generally phytoplankton) and ciliates. Weak correlations between copepods and phytoplankton were found in January and April, while there were no correlations during the diatom spring bloom (February-March) when phytoplankton were superfluous throughout the water column. Copepods and ciliates were never correlated. Ingestion as determined from gut fluorescence and egg production analyses suggested a higher degree of herbivory during the spring bloom than before and after. There was potential for copepod predation control of ciliate biomass throughout the study. Due to low copepod abundance in January through March estimated grazing pressure was not sufficient to control phytoplankton biomass until after the diatom spring bloom. Egg production rates were constant for Centropages hamatus (sim 20 eggs female-1 day-1) on all dates but more variable (1–26 eggs female-1 day-1) for the other species. Temora longicornis and Acartia sp. both revealed their lowest fecundity during the bloom.

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