Population modelling of <i>Acartia</i> spp. in a water column ecosystem model for the South-Eastern Baltic Sea

Abstract

Abstract. This paper describes numerical simulations of the seasonal dynamics of Acartia spp. in the South-Eastern Baltic Sea. The studies were carried out using a structured zooplankton population model adapted to Acartia 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 Acartia 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. The numerical studies are a following step in understanding how the population dynamics of a dominant species in the South-Eastern Baltic Sea interact with the environment.

Habitat Heterogeneity Determines Climate Impact on Zooplankton Community Structure and Dynamics

“…Phytoplankton production is known to be an important driver for Acartia spp. [43], having a stronger effect on egg production than temperature [56], [57]. Although Acartia spp.…”

Oxygenation of anoxic sediments triggers hatching of zooplankton eggs

“…This potentially triggers hatching of eggs trapped in anoxic conditions. However, current population and carbon flow models tend not to incorporate the magnitude of this benthic-pelagic coupling [47,48]. Carbon circulation and deposition in the ocean is generally described in a concept called the biological pump [48].…”

The Interannual Changes in the Secondary Production and Mortality Rate of Main Copepod Species in the Gulf of Gdańsk (The Southern Baltic Sea)

“…The aim of this study was to describe the secondary production and mortality rates of three dominant calanoid copepod species Acartia spp., Temora longicornis and Pseudocalanus acuspes in the southern Baltic Sea with relation to hydrographic water conditions. The data will be used for upgrading the copepod population model for the Baltic Sea [18][19][20][21][22].…”