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Parameterisation of a population model for Acartia spp. in the Southern Baltic Sea. Part 2. Egg production

100%

Dzierzbicka-Glowacka L., Lemieszek A., Zmijewska M. I.

Oceanologia

|

2009

|

tom 51

|

nr 2

185-201

The paper describes the modelling ofeg g production in Acartia spp. under changing environmental conditions in the southern Baltic Sea (Gdańsk Deep). The hypothesis (Sekiguchi et al. 1980) that the food-saturated rate of egg matter production is equivalent to specific growth rate ofco pepods is applied. The average number ofeggs produced per day by one Acartia female is obtained as a function ofg rowth rate, i.e. by multiplying exp gN3 − 1 from the growth rate of the nauplius stage equation by Wfemale/Wegg. The copepod model, reduced to a zerodimensional population model calibrated for Acartia spp. under the environmental conditions typical ofthe southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate ofeac h oft he model stages (see Part 1 – Dzierzbicka-Głowacka et al. 2009 – this issue). In this part, egg production as a function of the above parameters is evaluated. The rate of reproduction during the seasons in the upper layer ofthe Gdańsk Deep is also determined.

2

Short-term changes in pelagic biocenosis in the near-surface layer at station G-2 (Gdansk Deep, Southern Baltic) during the spring bloom

100%

Witek Z., Allikas E.

Oceanologia

|

1990

|

tom 28

3

Utilization of dissolved amino acids by marine bacteria isolated from the surface and subsurface layers of the Gdansk Deep

100%

Mudryk Z., Skorczewski P.

Polish Journal of Environmental Studies

|

1998

|

tom 07

|

nr 5

4

Diurnal variations in nitrogen, phosphorus and iron compounds in the Southern Baltic Sea

84%

Sikorowicz G., Falkowska L., Burska D., Dunajska D., Pryputniewicz D., Magulski R., Lewandowska A.

Oceanologia

|

2005

|

tom 47

|

nr 2

In order to assess their short-term variability, nutrient concentrations were measured at standard depths at 2 h intervals in the deepest region of the Gdańsk Deep during the first ten days of June 2001. The mean concentrations of nutrients in the euphotic zone were: NN (NO2 −, NO3 −, NH4 +) – 1.93 μmol dm−3, PO4 3− – 0.12 μmol dm−3 and Fetot – 0.11 μmol dm−3. During daylight hours, when the rate of assimilation was fastest, concentrations of nitrogen, phosphorus and iron compounds were very low. The phosphate concentration fell to a minimum (0.03 μmol dm−3) between 04:00 and 10:00 hrs, while total iron dropped to 0.01 μmol dm−3 between 10:00 and 16:00 hrs. Both levels were below the limiting values for phosphorus and iron. At night, concentrations of NO3 − and PO4 3− rose by 25%, those of NH4 + and Fetot by 35%. The mean molar ratios of NN:PO4 3− and Fetot:PO4 3− in the surface layer were subject to significant daily fluctuations. The molar NN:PO4 3− ratio was higher than the optimum value established for the Baltic Sea. Below the halocline, the concentrations of dissolved iron and phosphorus rose as a result of diffusion from sediments in response to changing redox conditions.

5

Effect of some heavy metals on neustonic and planktonic bacteria isolated from the Deep of Gdansk

84%

Mudryk Z., Donderski W., Skorczewski P., Walczak M.

Oceanological Studies

|

2000

|

tom 29

|

nr 1

6

Comparison various methods of determining aerosol deposition velocity and their influence on the calculated values of aerosol fluxes

84%

Nadstazik A., Falkowska L.

Oceanological Studies

|

1997

|

tom 26

|

nr 1

7

Selected ionic components of the marine aerosol over the Gulf of Gdańsk

84%

Nadstazik A., Falkowska L.

Oceanologia

|

2001

|

tom 43

|

nr 1

Aerosol samples were collected in May 1997 at a routine off-shore measurement station in the Gdańsk Deep region and at Hel, the latter being a coastal station situated at the tip of the Hel Peninsula. Concentrations of NO− 3 , Cl−, Na+, Mg2+, K+ and Ca2+ were measured simultaneously at both stations. The sea influences the chemical composition of aerosols in the coastal zone of the Gulf of Gdańsk regardless of season, time of day or direction of advection. Sodium chloride was always present in aerosols in the form of large particles originating from seawater. Besides the marine chloride and nitrate, additional amounts of these ions could have been of terrigenous origin. Sodium and chloride concentrations were dominant in the total mass of aerosols at both stations; however, these concentrations were three times higher at the marine station. Similarly, the concentrations of ions originating from seawater, like magnesium and calcium, were, on average, three times higher at the marine station. The chemical composition of aerosols and air over the Gulf of Gdańsk was modified through the evaporation of chloride from the marine salt particles in reactions with gaseous nitric and sulphuric acids. A certain deficit of chloride versus sodium ions was noted. At the marine station the Cl−/Na+ ratio reached 0.89 ± 0.2, on average, while over the land station it was 0.93 ± 0.25, i.e. lower than the seawater standard.

8

Heavy metals in the Baltic surface sediments

84%

Pempkowiak J., Walkusz-Miotk J.

Bulletin of the Polish Academy of Sciences. Earth Sciences

|

1994

|

tom 42

|

nr 1

9

Vertical water circulation in the southern Baltic and its environmental implications

84%

Jankowski A.

Oceanologia

|

1996

|

tom 38

|

nr 4

10

Stratification of particulate organic carbon and nitrogen in the Gdańsk Deep (Southern Baltic Sea)

84%

Burska D., Pryputniewicz D., Falkowska L.

Oceanologia

|

2005

|

tom 47

|

nr 2

Particulate organic carbon (POC) and nitrogen (PON) concentrations and fluxes were measured during an experiment in the Gdańsk Deep in late spring (30.05. –06.06.2001). The vertical POC and PON concentration profiles were characterised by the highest values in the euphotic layer,a gradual decrease with depth, and an increase below the halocline. The hydrophysical conditions had a decisive impact on POC and PON fluxes in the water column. Preferential removal of nitrogen from suspended mater was observed in the entire water column (maximum – in the vicinity of thermocline). There were also differences in the diurnal effectiveness of nitrogen removal as compared to carbon removal. The removal rate was highest at night.

11

Bacterial utilization of carbohydrates in the surface seawater layers of the Gdansk Deep

67%

Mudryk Z., Skorczewski P.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

|

1997

|

tom 01

12

DOC and POC in the water column of the Southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter

67%

Maciejewska A., Pempkowiak J.

Oceanologia

|

2014

|

tom 56

|

nr 3

13

Nitrogen and phosphorus exchange in the contact zone between the sea and the atmosphere

67%

Falkowska L., Bolalek J.

Oceanologia

|

1991

|

tom 30

14

Particulate organic carbon in the Southern Baltic Sea: numerical simulations and experimental data

67%

Dzierzbicka-Glowacka L., Kulinski K., Maciejewska A., Jakacki J., Pempkowiak J.

Oceanologia

|

2010

|

tom 52

|

nr 4

Particulate Organic Carbon (POC) is an important component in the carbon cycle of land-locked seas. In this paper, we assess the POC concentration in the Gdańsk Deep, southern Baltic Sea. Our study is based on both a 1D POC Model and current POC concentration measurements. The aim is twofold: (i) validation of simulated concentrations with actual measurements, and (ii) a qualitative assessment of the sources contributing to the POC pool. The POC model consists of six coupled equations: five diffusion-type equations for phytoplankton, zooplankton, pelagic detritus and nutrients (phosphate and total inorganic nitrogen) and one ordinary differential equation for detritus at the bottom. The POC concentration is determined as the sum of phytoplankton, zoo-plankton and pelagic detritus concentrations, all expressed in carbon equivalents. Bacteria are not simulated in this paper. The observed large fluctuations of POC concentrations are attributed to its appreciable seasonal variability. The maximum concentration of POC varied between 870 mgC m−3 in May and 580 mgC m−3 in September, coinciding with the period of maximum dead organic matter and phytoplankton biomass concentrations. The results of the numerical simulations are in good agreement with observed values. The difference between the modelled and observed POC concentrations is equal to 3–28% and depends on the month for which the calculations were made, although no time trend of the difference is observed. The conclusion is that the numerical simulations are a ufficiently good reflection of POC dynamics in the Baltic.

15

Migration patterns of acoustic scatterers in the southern Baltic Sea

67%

Szczucka J., Klusek Z.

Oceanologia

|

1996

|

tom 38

|

nr 1

16

Short-term changes in the hydrochemical constituents in the water column of the Gdansk Deep [Baltic Sea] in spring. Part 2. Modelling of diel changes in nutrient concentrations in the euphotic layer

67%

Falkowska L.

Oceanologia

|

1998

|

tom 40

|

nr 2

17

Determination of indole-3-acetic acid in sediments of the southern Baltic Sea

67%

Mazur H.

Oceanologia

|

1998

|

tom 40

|

nr 2

18

Short-term fluctuations in dissolved silicate concentrations in the Gdansk Deep

67%

Burska D., Falkowska L., Bolalek J.

Oceanological Studies

|

1997

|

tom 26

|

nr 2-3

19

Carotenoid pigments in Baltic Sea sediments

67%

Lotocka M.

Oceanologia

|

1998

|

tom 40

|

nr 1

20

Occurrence and distribution of bacteria decomposing organic phosphorus compounds in the surface seawater layers

67%

Mudryk Z.

Oceanological Studies

|

1998

|

tom 27

|

nr 3

Ograniczanie wyników

Parameterisation of a population model for Acartia spp. in the Southern Baltic Sea. Part 2. Egg production

Short-term changes in pelagic biocenosis in the near-surface layer at station G-2 (Gdansk Deep, Southern Baltic) during the spring bloom

Utilization of dissolved amino acids by marine bacteria isolated from the surface and subsurface layers of the Gdansk Deep

Diurnal variations in nitrogen, phosphorus and iron compounds in the Southern Baltic Sea

Effect of some heavy metals on neustonic and planktonic bacteria isolated from the Deep of Gdansk

Comparison various methods of determining aerosol deposition velocity and their influence on the calculated values of aerosol fluxes

Selected ionic components of the marine aerosol over the Gulf of Gdańsk

Heavy metals in the Baltic surface sediments

Vertical water circulation in the southern Baltic and its environmental implications

Stratification of particulate organic carbon and nitrogen in the Gdańsk Deep (Southern Baltic Sea)

Bacterial utilization of carbohydrates in the surface seawater layers of the Gdansk Deep

DOC and POC in the water column of the Southern Baltic. Part I. Evaluation of factors influencing sources, distribution and concentration dynamics of organic matter

Nitrogen and phosphorus exchange in the contact zone between the sea and the atmosphere

Particulate organic carbon in the Southern Baltic Sea: numerical simulations and experimental data

Migration patterns of acoustic scatterers in the southern Baltic Sea

Short-term changes in the hydrochemical constituents in the water column of the Gdansk Deep [Baltic Sea] in spring. Part 2. Modelling of diel changes in nutrient concentrations in the euphotic layer

Determination of indole-3-acetic acid in sediments of the southern Baltic Sea

Short-term fluctuations in dissolved silicate concentrations in the Gdansk Deep

Carotenoid pigments in Baltic Sea sediments

Occurrence and distribution of bacteria decomposing organic phosphorus compounds in the surface seawater layers