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1
Content available remote Population dynamics of the main copepod species in the Gulf of Gdańsk (the southern Baltic Sea) : abundance, biomass and production rates
Musialik-Koszarowska M., Dzierzbicka-Głowacka L., Kalarus M., Lemieszek A., Maruszak P., Żmijewska M. I.
Oceanological and Hydrobiological Studies
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2016
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Vol. 45, No. 2
159--171
EN
The aim of this study was to describe the production biomass and abundance dynamics of the major Baltic calanoid copepods (Acartia spp., Temora longicornis and Pseudocalanus sp.) in the Gulf of Gdańsk (the southern Baltic Sea) during a three-year period from March 2010 to December 2012. the data were collected at six stations located in the western part of the gulf. Acartia spp. was the most abundant taxon throughout the study period. the observed differences in the weighted mean depth for the investigated species were >2 m between nauplii and adults of Acartia spp., >5 m between nauplii and adults of Temora longicornis and 3 m between nauplii and younger copepodites of Pseudocalanus sp. the highest values of the secondary production rates were determined for Acartia spp. − almost 17.55 mg C m-2 d-1 (summer 2011), while Temora longicornis reached 3.80 mg C m-2 d-1 in spring 2010 and Pseudocalanus sp. had the highest secondary production values in summer 2011 − about 1.28 mg C m-2 d-1.
2
Content available remote Long-term changes in the total development time of Copepoda species occurring in large numbers in the Southern Baltic Sea : numerical calculations
Figiela M., Musialik-Koszarowska M., Nowicki A., Lemieszek A., Kalarus M., Druet C.
Oceanological and Hydrobiological Studies
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2016
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Vol. 45, No. 1
1--10
EN
The study presents changes in the total development time of Copepoda species, i.e. Pseudocalanus sp., Temora longicornis and Acartia spp. occurring in large numbers in the Southern Baltic Sea. The following factors were taken into account: temperature, salinity and concentration of food. The presented research involved simulations with greenhouse gas emissions scenarios A1B and B1. The analysis was performed for naupliar and copepodid stages combined together, and the results present the total development time of organisms from the naupliar stage to the adult form. The calculations were carried out using numerical methods based on the experimental data available in the literature.
3
Content available Seasonal variability in the population dynamics of the main mesozooplankton species in the Gulf of Gdańsk (southern Baltic Sea): production and mortality rates
Dzierzbicka-Głowacka L., Kalarus M., Musialik-Koszarowska M., Lemieszek A., Żmijewska M. I.
Oceanologia
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2015
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No. 57 (1)
78--85
EN
This manuscript is a continuation of the results presented in the earlier work by Dzierzbicka-Głowacka et al. (2013). Major purpose of this study is to characterize population dynamics of three major Baltic calanoid copepod species (Acartia spp., Temora longicornis and Pseudocalanus sp.) in the Gulf of Gdańsk during the years 2006–2007. This paper focuses mostly on biomass estimation, production and mortality rates. All three species had the highest observed biomass in summer 2007 and it was 12.62, 9.16 and 0.80 mg C m-3for Acartia spp., T. longicornis and Pseudocalanus sp., respectively, while highest daily production rates for those species were 28.22, 18.47, 1.34 mg C m-2, all recorded in summer 2007. Mortality rates were calculated for all copepodite stages of selected species, and in most cases highest values were observed during summer seasons
4
Content available remote Modeling of egg production by Temora longicornis from the southern Baltic Sea including salinity
Dzierzbicka-Głowacka L., Lemieszek A., Musialik M., Żmijewska I.M.
Oceanological and Hydrobiological Studies
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2013
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Vol. 42, No. 3
277--288
EN
The paper presents modeling of egg production (Egg — no. of eggs female−1 d−1) by Temora longicornis in the changing environmental conditions of the southern Baltic Sea (Gdańsk Deep). It is hypothesized that the food-saturated rate of egg matter production is equivalent to the specific growth rate of copepods. Based on the findings from the south-western Baltic Sea, Egg of T. longicornis is evaluated as a function of food concentration, temperature and salinity over a wide range of these parameters. Subsequently, the rate of reproduction during the seasons in the Gulf of Gdańsk is determined. According to our calculations, values of Egg reach ca 11 eggs per day in April and decline strongly in June-July, while the second smaller peak in reproduction occurs in September, ca 8 eggs per day. Our results suggest that egg production rates of T. longicornis depend not only on food concentration and temperature, but also on salinity, which is a masking factor in the Baltic Sea.
5
Content available remote Development and growth of Temora longicornis: numerical simulations using laboratory culture data
Dzierzbicka-Głowacka L., Lemieszek A., Żmijewska I.M.
Oceanologia
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2011
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No. 53 (1)
137-161
EN
Quantitative expressions are presented to describe the effects of temperature and food concentration on stage duration and growth rate of Temora longicornis for each of the model stage groups (N1-N6 - naupliar stages, C1, C2, C3, C4, C5 - the five copepodid stages). The calculations were made on the basis of experimental data from the literature for Temora longicornis from the south-eastern and the southern North Sea. Relationships were obtained between the growth parameters and temperature for the 5-10°C temperature range and food concentrations from 25 mgC m-3 to excess. Also computed was the total mean development time as a function of the above-mentioned parameters, temperature and food availability. The simulations computed here are similar to the experimental results. The growth rates for successive stages were obtained according to the correction of the "Moult Rate" method, which allows the use of mean weights and stage durations. The calculations also suggest that three complete generations of T. longicornis from the Gdańsk Deep (the southern Baltic Sea) can develop during a single year.
6
Content available remote Parameterisation of a population model for Acartia spp. in the southern Baltic Sea. Part 1. Development time
Dzierzbicka-Głowacka L., Lemieszek A., Żmijewska M.I.
Oceanologia
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2009
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No. 51 (2)
165-184
EN
The copepod model (see Dzierzbicka-Głowacka 2005b), reduced to a zero-dimensional population model (Fennel 2001, Stegert et al. 2007), is calibrated for Acartia spp. under the environmental conditions typical of the southern Baltic Sea. Most of the coefficients used in the model are taken from the literature, containing values from various published studies and parameters derived for similar species. The parameters for growth are presented in Part 1; those for population dynamics are given in Part 2. Ingestion rates, which are dependent on developmental stage, food supply, temperature and weight of the animals, are estimated for Acartia bifilosa at 15°C from the Gdańsk Deep after the experimental data of Ciszewski & Witek (1977). In Part 1 the model presents the change in mean individual mass in successive stages. Quantitative formulae are obtained describing the effects of temperature and food concentration on the development time of Acartia spp. for each of the model stage groups. The generation time during the seasons in the upper layer of the Gdańsk Deep is also determined. The simulations computed here are similar to the experimental results. Part 2 (Dzierzbicka-Głowacka et al. 2009 - this issue) will evaluate egg production as a function of the above-mentioned parameters, temperature and food availability.
7
Content available remote Parameterisation of a population model for Acartia spp. in the southern Baltic Sea. Part 2. Egg production
Dzierzbicka-Głowacka L., Lemieszek A., Żmijewska M.I.
Oceanologia
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2009
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No. 51 (2)
185-201
EN
The paper describes the modelling of egg 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 of copepods is applied. The average number of eggs produced per day by one Acartia female is obtained as a function of growth 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 zero-dimensional population model calibrated for Acartia spp. under the environmental conditions typical of the southern Baltic Sea, was used to determine the effects of temperature and food concentration on the growth rate of each of the 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 of the Gdańsk Deep is also determined.
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