Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 7 2010 10.5194/bg-7-2247-2010 http://www.biogeosciences.net/7/2247/2010/ http://www.biogeosciences.net/7/2247/2010/bg-7-2247-2010.html http://www.biogeosciences.net/7/2247/2010/bg-7-2247-2010.pdf 2247 2259 2010-07-21 Population modelling of <i>Acartia</i> spp. in a water column ecosystem model for the South-Eastern Baltic Sea L. Dzierzbicka-Glowacka I. M. Żmijewska S. Mudrak J. Jakacki A. Lemieszek Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland Institute of Oceanography, University of Gdansk, Gdynia, Poland This paper describes numerical simulations of the seasonal dynamics of <i>Acartia</i> spp. in the South-Eastern Baltic Sea. The studies were carried out using a structured zooplankton population model adapted to <i>Acartia</i> spp. The population model with state variables for eggs, nauplii, five copepodites stages and adults was coupled with a marine ecosystem model. Four state variables for the carbon cycle represent the functional units of phytoplankton, pelagic detritus, benthic detritus, and bulk zooplankton, which represent all zooplankton other than the structured population. The annual cycle simulated for 2000 under realistic weather and hydrographic conditions was studied with the coupled ecosystem-zooplankton model applied to a water column in the Gdansk Gulf (South-Eastern Baltic Sea). The vertical profiles of selected state variables were compared to the physical forcing to study differences between bulk and structured zooplankton biomass. The simulated population dynamics of <i>Acartia</i> spp. and zooplankton as one biomass state variable were compared with observations in the Gdansk Gulf. Simulated generation times are more affected by temperature than food conditions except during the spring phytoplankton bloom. 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