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Zeitschriftendaten
Format
Zeitschrift
eISSN
1897-3191
Erstveröffentlichung
23 Feb 2007
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 40 (2011): Heft 2 (June 2011)

Zeitschriftendaten
Format
Zeitschrift
eISSN
1897-3191
Erstveröffentlichung
23 Feb 2007
Erscheinungsweise
4 Hefte pro Jahr
Sprachen
Englisch

Suche

12 Artikel
access type Uneingeschränkter Zugang

Ecological status of shallow Lake Gorbacz (NE Poland) in its final stage before drying up

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 1 - 12

Zusammenfassung

Abstract

The article assesses the ecological status of shallow Gorbacz Lake (NE Poland) in the last stage before complete drying up. For last few years hydrological regime of the lake catchment has been changed dramatically which was caused by functioning nearby peat mine and longer autumn drought periods for following years. Progressing macrophytes succession leaded complete emergent macrophytes overgrowth of the lake beginning from 2000. The analyses include records of previous samples and data for morphology, water quality, phytoplankton, zooplankton and macrophytes. The trophic status of Gorbacz Lake was verified compare to the previous studies. The results indicate that even with minimum amount of water Gorbacz Lake itself still keeps its dystrophic character with increasing of water color and of DOC, biogenic substances, chlorophyll a concentrations. Humic State Index (HSI) and hydrochemical dystrophy index (HDI) confirm the dystrophic status of the lake with values 71.3 and 76.2 respectively. Both typical phytoplankton representatives of eutrophic and dystrophic waters were recorded. Very high diversity of desmids in the telmatoplankton, indicates the observed process of shallowing in the reservoir. Planktonic crustacean fauna was represented by small filtrators. Rotifera community was strongly dominated by Trichocerca simonei. The article concludes with the main causes of the observed changes and some future remarks for the lake state.

Schlüsselwörter

  • shallow lake
  • drying up
  • drought
  • the trophic status
  • perturbation
access type Uneingeschränkter Zugang

Comparison of gastrotrich fauna on elodeids and in bottom sediments of lakes of different trophic status (the region Polesie Lubelskie, Eastern Poland)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 13 - 21

Zusammenfassung

Abstract

Species diversity of gastrotrich communities on elodeids and in bottom sediments of lakes of different trophic status was compared. Thirty-eight species of Gastrotricha (34 in bottom sediment and 21 on elodeids) were found, which belong to the only family of Chaetonotidae Zelinka, 1889. Species diversity of both habitats was reflected in the diversity indices ranging from 2.02 (a dystrophic lake) to 2.67 (a strongly eutrophic lake) for bottom sediment, and from 2.01 (a mesotrophic lake) to 2.54 (a strongly eutrophic lake) for elodeids. The similarity of gastrotrich fauna from the two habitats was low, and varied from 17% (a mesotrophic lake) to 38% (a strongly eutrophic lake). Low similarity of elodeid fauna from lakes of different trophic status was also found, in spite of similar plant species composition. The lowest similarity in elodeid fauna (23%) was recorded for dystrophic and mesotrophic lakes, whereas the highest one (68%) was observed for eutrophic and strongly eutrophic lakes. That allows to conclude that the diversity of epiphytic fauna is affected by trophic status rather than by vegetation type. The comparison of the gastrotrich fauna from elodeids and bottom sediments in lakes of different trophic status provides additional autoecological characteristics of Heterolepidoderma ocellatum (Mečnikow, 1865) and allows to recognize this species as belonging to a group of species closely related to macrophytes.

Schlüsselwörter

  • Gastrotricha
  • sediments
  • epiphytic fauna
  • freshwater species
  • Poland
access type Uneingeschränkter Zugang

Dystrophy or eutrophy: phytoplankton and physicochemical parameters in the functioning of humic lakes

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 22 - 29

Zusammenfassung

Abstract

The studies were carried out in six humic lakes (Polesie Region, Eastern Poland) in order to present a role of phytoplankton in relation to physical and chemical parameters characteristic of particular processes. On the basis of physical and chemical properties of waters (SD, colour, pH, EC, Ca2+, DIC, DOC), these lakes are divided into three groups: dystrophic (Lakes Orchowe and Płotycze), humoeutrophic (Lakes Brudzieniec and Pereszpa) and mesoeutrophic (Lakes Moszne and Długie). The occurrence of dystrophication, humoeutrophication or eutrophication processes is clearly reflected in the phytoplankton composition and its abundance, as well as its biomass. In both dystrophic and humoeutrophic lakes, flagellates dominated in the phytoplankton. Among them, the invasive species Gonyostomum semen was very abundant. Mesoeutrophic lakes were characterized by other phytoplankton composition, mainly by non-flagellate species (green algae).

Schlüsselwörter

  • humic lakes
  • water chemistry
  • phytoplankton composition
  • flagellates
  • Gonyostomum semen
access type Uneingeschränkter Zugang

The disappearance of stonewort populations in lobelia lakes of the Kashubian Lakeland (NW Poland)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 30 - 36

Zusammenfassung

Abstract

The subject of this work is a comparative analysis of stonewort populations in 5 lobelia lakes of the Kashubian Lakeland based on literature data from the mid-1970s and the authors’ own studies from 2006. In the 1970s 15 sites of 7 stonewort species: Chara delicatula, C. fragilis, C. tomentosa, C. rudis, Nitella flexilis, N. opaca and N. mucronata were recorded in the lakes under study. The populations of C. delicatula and N. flexilis occupied the area from 0.3 to 6 m deep and were characterized by 20% cover on average. Thirty years later, in 2006, the presence of only 6 out of 15 stands was confirmed: 3 of C. delicatula and 3 of N. flexilis. Thus, a total of 9 stands (60%) and 5 species (71%) had disappeared completely. The majority of the preserved populations survived in a vestigial form. Population areas of C. delicatula reached a depth of 2 m and their cover did not exceed 5%. Populations of N. flexilis occupied the littoral up to a depth of 7 m and had 10% cover. The disappearance of stoneworts was probably caused by both anthropogenic factors and natural processes.

Schlüsselwörter

  • anthropopressure
  • Charophyta
  • Characeae
  • Chara
  • Nitella
  • disappearance of stoneworts
  • lobelia lakes
access type Uneingeschränkter Zugang

The impact of environmental factors on zooplankton communities in the Vistula Lagoon

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 37 - 48

Zusammenfassung

Abstract

The Vistula Lagoon, an estuarine system exposed to both continental and marine impacts, is marked by rapid changes in local environmental conditions, including salinity levels, water transparency, temperature, pH, dissolved oxygen concentrations, trophic state and wind speed. Here, the effect of environmental factors on the abundance and horizontal distribution of zooplankton was analysed. A higher number of taxa were noted in the saltwater intrusion section of the Vistula Lagoon (Central Basin) compared to the area of freshwater inflow (Western Basin). The average density of the analysed zooplankton in the western section of the Vistula Lagoon reached 654 indiv. dm−3, three-fold higher than in the central section (224 indiv. dm−3). Differences in zooplankton biomass were even more pronounced (13.43 mg dm−3 vs. 2.33 mg dm−3). The Central Basin of the Vistula Lagoon was dominated by Copepoda (approx. 50% total abundance), mostly Calanoida (genus Acartia) typically found in brackish waters. Marine species, including Acartia bifilosa and Acartia tonsa, were also reported. Species of freshwater Cladocera predominated in the Western Basin (over 50% total abundance, mostly the eutrophic species Chydorus sphaericus) where Copepoda were represented by a single cyclopoid species, Cyclops vicinus. The saline and freshwater environments of the Vistula Lagoon differed significantly (p<0.001) with respect to the abundance and biomass of zooplankton. The above differences resulted not only from salinity and temperature conditions, but also from dissolved oxygen concentrations, the trophic state of the investigated water body, and the existing biocenotic relationships.

Schlüsselwörter

  • brackish water bodies
  • zooplankton
  • environmental factors
access type Uneingeschränkter Zugang

Nonylphenol and 4-tert-octylphenol in the Gulf of Gdansk coastal zone

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 49 - 56

Zusammenfassung

Abstract

The concentrations of nonylphenol and 4-tert-octylphenol were measured in surface waters in the Gulf of Gdansk coastal zone (summer 2010). The mean concentration in the samples of subsurface water were 34.49 ng dm−3 (nonylphenol) and 3.04 ng dm−3 (4-tert-octylphenol). The highest nonylphenol concentrations were detected in the samples of subsurface water collected from the Sea Boulevard (Gdynia) while the highest concentrations of 4-tert-octylphenol were found in the yacht harbor Marina Gdynia, and in the Kacza and Gizdebka rivers. A significant enrichment (13–45 times) of 4-tert-octylphenol was observed in the surface microlayer of water. These levels exceeded the predicted no effect concentration by 2–9 times.

Schlüsselwörter

  • alkylphenols
  • 4-tert-octylphenol
  • nonylphenol
  • microlayer
  • Gulf of Gdansk
access type Uneingeschränkter Zugang

Phosphate exchange across the sediment-water interface under oxic and hypoxic/anoxic conditions in the southern Baltic Sea

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 57 - 71

Zusammenfassung

Abstract

Benthic fluxes of phosphate and phosphorus distribution in sediments from the southern Baltic Sea were investigated in spring and autumn in 2005 and 2007–2010. Strong spatial variability of phosphate fluxes was observed across the sediment-water interface. The highest values of phosphate flux from sediment (up to 37 μmol m−2 h−1), resulting from the high mineralization rate of organic matter and rapid phosphorus turnover due to macrofaunal activity and hydrodynamic conditions, were observed in the shallow area at depths ranging from 50 to 69 m. The rate of phosphate exchange in the transportation and accumulation bottom area with the water depth ≥72 m was several times lower (2.12–6.22 μmol m−2 h−1). In continuously hypoxic or anoxic sediments, phosphorus was preserved in the refractory organic form, and sediments were depleted of redox-dependent phosphorus forms. In shallow area with well oxygenated near-bottom water, phosphorus was present mainly in the calcium-bound form.

Schlüsselwörter

  • phosphorus
  • hypoxia
  • benthic fluxes
  • eutrophication
  • sediments
  • Baltic Sea
access type Uneingeschränkter Zugang

Phosphorus in sediments and pore waters of selected Polish dam reservoirs

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 72 - 85

Zusammenfassung

Abstract

This study aimed to examine and explain the spatial distribution of total phosphorus in sediments and orthophosphates in interstitial water in four Polish dam reservoirs with varying hydrological and geochemical characteristics. The results are linked to physicochemical parameters of sediments: organic matter and calcium carbonates content, pH, redox potential and conductivity.

In two of the studied reservoirs hydrological dynamics were a driving force in phosphorus circulation, despite the big difference in their mean water retention times, and interactions with Ca and Fe were of secondary importance

In other reservoirs with complicated shorelines and reservoir beds, due to water flow disturbance the hydrological impact was not as pronounced. Geochemical processes, such as precipitation of phosphorus associated with Ca+2, Fe(III) or in complexed with humic substances became more significant.

Schlüsselwörter

  • Total phosphorus
  • phosphate
  • sediments
  • interstitial water
  • dam reservoirs
access type Uneingeschränkter Zugang

On the use of a simple primary productivity model to assess the skill of a physical ocean model

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 86 - 95

Zusammenfassung

Abstract

Ecosystem models, used mainly in studying the interactions between different trophic levels, can also be used for ocean circulation model skill assessment, with the help of satellite ocean color data. This paper presents how the use of a simple NPZ primary productivity ecosystem model, coupled to a hydrodynamical model, can help assessing the skill of the physical ocean model in depicting realistically the prevailing mesoscale features of the upper layers of the Gulf of Mexico. Results indicate that the physical model effectively reproduces the mesoscale features of circulation underlying the resulting chlorophyll concentrations, especially when circulation fronts exist.

Schlüsselwörter

  • operational oceanography
  • coupled physical-biochemical models
  • ocean color
  • skill assessment
  • primary productivity
  • chlorophyll concentrations
access type Uneingeschränkter Zugang

A long-term trend and temporal fluctuations of the sea level at the Polish Baltic coast

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 96 - 107

Zusammenfassung

Abstract

The analysis of sea level record series along the Polish coast is presented. The main aim was to identify linear trends in the sea level changes at the coastal (Świnoujście, Kołobrzeg, Ustka, Łeba, Władysławowo, Hel, Gdynia, Gdańsk), lagoonal (Trzebież, Tokmicko) and riverine (Szczecin) gauge stations. The analysis showed individual coastal stations to differ in the rate of sea level changes. During 60 years of continuous observations (1947–2006), the differences varied from 1.0 (the western part of the coast) to 2.5 mm year−1 (the eastern part of the coast). The longest, more than 100-yr-long data series showed the sea level rise in Świnoujście and Kołobrzeg to be about 0.5 mm year−1; 1.57 mm year−1 being revealed in Gdańsk. Spectral analysis applied to the data showed numerous fluctuations and cyclicity in changes of the annual mean sea level at the Polish coast. A distinct, major 3-year cycle was revealed. In addition, three secondary cycles of 4.6, 6.7, and 8.6 years were present in the data, more or less clearly identifiable at individual stations.

Schlüsselwörter

  • sea level
  • trend
  • fluctuations
  • Baltic coast
access type Uneingeschränkter Zugang

Upwelling intrusion into shallow Puck Lagoon, a part of Puck Bay (the Baltic Sea)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 108 - 111

Zusammenfassung

Abstract

In this short communication we present the results of field measurements which show the incidence of waters originating from the deeper layers of Puck Bay in shallow Puck Lagoon. The reason for such a situation is the occurrence of a small-scale upwelling. This phenomenon may play a significant role in shaping the ecosystem conditions of Puck Lagoon, which is unique in terms of its natural values.

Schlüsselwörter

  • Puck Bay
  • field measurements
  • water physical properties
  • upwelling
access type Uneingeschränkter Zugang

Total organic carbon as a new index for monitoring trophic states in lakes

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 112 - 115

Zusammenfassung

Abstract

Total organic carbon (TOC) can be one of the parameters used to determine trophic state in lakes, as shown by the statistically significant correlation between TOC and chlorophyll, total phosphorus and Secchi disk transparency. Calculation of the TSI index based on TOC according to the formula TSI(TOC) = 20.59 + 15.71 ln(TOC) and its introduction as an additional index to the classification by Carlson may optimize the comparative analysis of lakes and allow a measurable assessment of lakes with respect to the trophic gradient.

Schlüsselwörter

  • Trophic state index
  • total phosphorus
  • chlorophyll a
  • Secchi depth
  • total organic carbon
12 Artikel
access type Uneingeschränkter Zugang

Ecological status of shallow Lake Gorbacz (NE Poland) in its final stage before drying up

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 1 - 12

Zusammenfassung

Abstract

The article assesses the ecological status of shallow Gorbacz Lake (NE Poland) in the last stage before complete drying up. For last few years hydrological regime of the lake catchment has been changed dramatically which was caused by functioning nearby peat mine and longer autumn drought periods for following years. Progressing macrophytes succession leaded complete emergent macrophytes overgrowth of the lake beginning from 2000. The analyses include records of previous samples and data for morphology, water quality, phytoplankton, zooplankton and macrophytes. The trophic status of Gorbacz Lake was verified compare to the previous studies. The results indicate that even with minimum amount of water Gorbacz Lake itself still keeps its dystrophic character with increasing of water color and of DOC, biogenic substances, chlorophyll a concentrations. Humic State Index (HSI) and hydrochemical dystrophy index (HDI) confirm the dystrophic status of the lake with values 71.3 and 76.2 respectively. Both typical phytoplankton representatives of eutrophic and dystrophic waters were recorded. Very high diversity of desmids in the telmatoplankton, indicates the observed process of shallowing in the reservoir. Planktonic crustacean fauna was represented by small filtrators. Rotifera community was strongly dominated by Trichocerca simonei. The article concludes with the main causes of the observed changes and some future remarks for the lake state.

Schlüsselwörter

  • shallow lake
  • drying up
  • drought
  • the trophic status
  • perturbation
access type Uneingeschränkter Zugang

Comparison of gastrotrich fauna on elodeids and in bottom sediments of lakes of different trophic status (the region Polesie Lubelskie, Eastern Poland)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 13 - 21

Zusammenfassung

Abstract

Species diversity of gastrotrich communities on elodeids and in bottom sediments of lakes of different trophic status was compared. Thirty-eight species of Gastrotricha (34 in bottom sediment and 21 on elodeids) were found, which belong to the only family of Chaetonotidae Zelinka, 1889. Species diversity of both habitats was reflected in the diversity indices ranging from 2.02 (a dystrophic lake) to 2.67 (a strongly eutrophic lake) for bottom sediment, and from 2.01 (a mesotrophic lake) to 2.54 (a strongly eutrophic lake) for elodeids. The similarity of gastrotrich fauna from the two habitats was low, and varied from 17% (a mesotrophic lake) to 38% (a strongly eutrophic lake). Low similarity of elodeid fauna from lakes of different trophic status was also found, in spite of similar plant species composition. The lowest similarity in elodeid fauna (23%) was recorded for dystrophic and mesotrophic lakes, whereas the highest one (68%) was observed for eutrophic and strongly eutrophic lakes. That allows to conclude that the diversity of epiphytic fauna is affected by trophic status rather than by vegetation type. The comparison of the gastrotrich fauna from elodeids and bottom sediments in lakes of different trophic status provides additional autoecological characteristics of Heterolepidoderma ocellatum (Mečnikow, 1865) and allows to recognize this species as belonging to a group of species closely related to macrophytes.

Schlüsselwörter

  • Gastrotricha
  • sediments
  • epiphytic fauna
  • freshwater species
  • Poland
access type Uneingeschränkter Zugang

Dystrophy or eutrophy: phytoplankton and physicochemical parameters in the functioning of humic lakes

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 22 - 29

Zusammenfassung

Abstract

The studies were carried out in six humic lakes (Polesie Region, Eastern Poland) in order to present a role of phytoplankton in relation to physical and chemical parameters characteristic of particular processes. On the basis of physical and chemical properties of waters (SD, colour, pH, EC, Ca2+, DIC, DOC), these lakes are divided into three groups: dystrophic (Lakes Orchowe and Płotycze), humoeutrophic (Lakes Brudzieniec and Pereszpa) and mesoeutrophic (Lakes Moszne and Długie). The occurrence of dystrophication, humoeutrophication or eutrophication processes is clearly reflected in the phytoplankton composition and its abundance, as well as its biomass. In both dystrophic and humoeutrophic lakes, flagellates dominated in the phytoplankton. Among them, the invasive species Gonyostomum semen was very abundant. Mesoeutrophic lakes were characterized by other phytoplankton composition, mainly by non-flagellate species (green algae).

Schlüsselwörter

  • humic lakes
  • water chemistry
  • phytoplankton composition
  • flagellates
  • Gonyostomum semen
access type Uneingeschränkter Zugang

The disappearance of stonewort populations in lobelia lakes of the Kashubian Lakeland (NW Poland)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 30 - 36

Zusammenfassung

Abstract

The subject of this work is a comparative analysis of stonewort populations in 5 lobelia lakes of the Kashubian Lakeland based on literature data from the mid-1970s and the authors’ own studies from 2006. In the 1970s 15 sites of 7 stonewort species: Chara delicatula, C. fragilis, C. tomentosa, C. rudis, Nitella flexilis, N. opaca and N. mucronata were recorded in the lakes under study. The populations of C. delicatula and N. flexilis occupied the area from 0.3 to 6 m deep and were characterized by 20% cover on average. Thirty years later, in 2006, the presence of only 6 out of 15 stands was confirmed: 3 of C. delicatula and 3 of N. flexilis. Thus, a total of 9 stands (60%) and 5 species (71%) had disappeared completely. The majority of the preserved populations survived in a vestigial form. Population areas of C. delicatula reached a depth of 2 m and their cover did not exceed 5%. Populations of N. flexilis occupied the littoral up to a depth of 7 m and had 10% cover. The disappearance of stoneworts was probably caused by both anthropogenic factors and natural processes.

Schlüsselwörter

  • anthropopressure
  • Charophyta
  • Characeae
  • Chara
  • Nitella
  • disappearance of stoneworts
  • lobelia lakes
access type Uneingeschränkter Zugang

The impact of environmental factors on zooplankton communities in the Vistula Lagoon

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 37 - 48

Zusammenfassung

Abstract

The Vistula Lagoon, an estuarine system exposed to both continental and marine impacts, is marked by rapid changes in local environmental conditions, including salinity levels, water transparency, temperature, pH, dissolved oxygen concentrations, trophic state and wind speed. Here, the effect of environmental factors on the abundance and horizontal distribution of zooplankton was analysed. A higher number of taxa were noted in the saltwater intrusion section of the Vistula Lagoon (Central Basin) compared to the area of freshwater inflow (Western Basin). The average density of the analysed zooplankton in the western section of the Vistula Lagoon reached 654 indiv. dm−3, three-fold higher than in the central section (224 indiv. dm−3). Differences in zooplankton biomass were even more pronounced (13.43 mg dm−3 vs. 2.33 mg dm−3). The Central Basin of the Vistula Lagoon was dominated by Copepoda (approx. 50% total abundance), mostly Calanoida (genus Acartia) typically found in brackish waters. Marine species, including Acartia bifilosa and Acartia tonsa, were also reported. Species of freshwater Cladocera predominated in the Western Basin (over 50% total abundance, mostly the eutrophic species Chydorus sphaericus) where Copepoda were represented by a single cyclopoid species, Cyclops vicinus. The saline and freshwater environments of the Vistula Lagoon differed significantly (p<0.001) with respect to the abundance and biomass of zooplankton. The above differences resulted not only from salinity and temperature conditions, but also from dissolved oxygen concentrations, the trophic state of the investigated water body, and the existing biocenotic relationships.

Schlüsselwörter

  • brackish water bodies
  • zooplankton
  • environmental factors
access type Uneingeschränkter Zugang

Nonylphenol and 4-tert-octylphenol in the Gulf of Gdansk coastal zone

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 49 - 56

Zusammenfassung

Abstract

The concentrations of nonylphenol and 4-tert-octylphenol were measured in surface waters in the Gulf of Gdansk coastal zone (summer 2010). The mean concentration in the samples of subsurface water were 34.49 ng dm−3 (nonylphenol) and 3.04 ng dm−3 (4-tert-octylphenol). The highest nonylphenol concentrations were detected in the samples of subsurface water collected from the Sea Boulevard (Gdynia) while the highest concentrations of 4-tert-octylphenol were found in the yacht harbor Marina Gdynia, and in the Kacza and Gizdebka rivers. A significant enrichment (13–45 times) of 4-tert-octylphenol was observed in the surface microlayer of water. These levels exceeded the predicted no effect concentration by 2–9 times.

Schlüsselwörter

  • alkylphenols
  • 4-tert-octylphenol
  • nonylphenol
  • microlayer
  • Gulf of Gdansk
access type Uneingeschränkter Zugang

Phosphate exchange across the sediment-water interface under oxic and hypoxic/anoxic conditions in the southern Baltic Sea

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 57 - 71

Zusammenfassung

Abstract

Benthic fluxes of phosphate and phosphorus distribution in sediments from the southern Baltic Sea were investigated in spring and autumn in 2005 and 2007–2010. Strong spatial variability of phosphate fluxes was observed across the sediment-water interface. The highest values of phosphate flux from sediment (up to 37 μmol m−2 h−1), resulting from the high mineralization rate of organic matter and rapid phosphorus turnover due to macrofaunal activity and hydrodynamic conditions, were observed in the shallow area at depths ranging from 50 to 69 m. The rate of phosphate exchange in the transportation and accumulation bottom area with the water depth ≥72 m was several times lower (2.12–6.22 μmol m−2 h−1). In continuously hypoxic or anoxic sediments, phosphorus was preserved in the refractory organic form, and sediments were depleted of redox-dependent phosphorus forms. In shallow area with well oxygenated near-bottom water, phosphorus was present mainly in the calcium-bound form.

Schlüsselwörter

  • phosphorus
  • hypoxia
  • benthic fluxes
  • eutrophication
  • sediments
  • Baltic Sea
access type Uneingeschränkter Zugang

Phosphorus in sediments and pore waters of selected Polish dam reservoirs

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 72 - 85

Zusammenfassung

Abstract

This study aimed to examine and explain the spatial distribution of total phosphorus in sediments and orthophosphates in interstitial water in four Polish dam reservoirs with varying hydrological and geochemical characteristics. The results are linked to physicochemical parameters of sediments: organic matter and calcium carbonates content, pH, redox potential and conductivity.

In two of the studied reservoirs hydrological dynamics were a driving force in phosphorus circulation, despite the big difference in their mean water retention times, and interactions with Ca and Fe were of secondary importance

In other reservoirs with complicated shorelines and reservoir beds, due to water flow disturbance the hydrological impact was not as pronounced. Geochemical processes, such as precipitation of phosphorus associated with Ca+2, Fe(III) or in complexed with humic substances became more significant.

Schlüsselwörter

  • Total phosphorus
  • phosphate
  • sediments
  • interstitial water
  • dam reservoirs
access type Uneingeschränkter Zugang

On the use of a simple primary productivity model to assess the skill of a physical ocean model

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 86 - 95

Zusammenfassung

Abstract

Ecosystem models, used mainly in studying the interactions between different trophic levels, can also be used for ocean circulation model skill assessment, with the help of satellite ocean color data. This paper presents how the use of a simple NPZ primary productivity ecosystem model, coupled to a hydrodynamical model, can help assessing the skill of the physical ocean model in depicting realistically the prevailing mesoscale features of the upper layers of the Gulf of Mexico. Results indicate that the physical model effectively reproduces the mesoscale features of circulation underlying the resulting chlorophyll concentrations, especially when circulation fronts exist.

Schlüsselwörter

  • operational oceanography
  • coupled physical-biochemical models
  • ocean color
  • skill assessment
  • primary productivity
  • chlorophyll concentrations
access type Uneingeschränkter Zugang

A long-term trend and temporal fluctuations of the sea level at the Polish Baltic coast

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 96 - 107

Zusammenfassung

Abstract

The analysis of sea level record series along the Polish coast is presented. The main aim was to identify linear trends in the sea level changes at the coastal (Świnoujście, Kołobrzeg, Ustka, Łeba, Władysławowo, Hel, Gdynia, Gdańsk), lagoonal (Trzebież, Tokmicko) and riverine (Szczecin) gauge stations. The analysis showed individual coastal stations to differ in the rate of sea level changes. During 60 years of continuous observations (1947–2006), the differences varied from 1.0 (the western part of the coast) to 2.5 mm year−1 (the eastern part of the coast). The longest, more than 100-yr-long data series showed the sea level rise in Świnoujście and Kołobrzeg to be about 0.5 mm year−1; 1.57 mm year−1 being revealed in Gdańsk. Spectral analysis applied to the data showed numerous fluctuations and cyclicity in changes of the annual mean sea level at the Polish coast. A distinct, major 3-year cycle was revealed. In addition, three secondary cycles of 4.6, 6.7, and 8.6 years were present in the data, more or less clearly identifiable at individual stations.

Schlüsselwörter

  • sea level
  • trend
  • fluctuations
  • Baltic coast
access type Uneingeschränkter Zugang

Upwelling intrusion into shallow Puck Lagoon, a part of Puck Bay (the Baltic Sea)

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 108 - 111

Zusammenfassung

Abstract

In this short communication we present the results of field measurements which show the incidence of waters originating from the deeper layers of Puck Bay in shallow Puck Lagoon. The reason for such a situation is the occurrence of a small-scale upwelling. This phenomenon may play a significant role in shaping the ecosystem conditions of Puck Lagoon, which is unique in terms of its natural values.

Schlüsselwörter

  • Puck Bay
  • field measurements
  • water physical properties
  • upwelling
access type Uneingeschränkter Zugang

Total organic carbon as a new index for monitoring trophic states in lakes

Online veröffentlicht: 02 Jun 2011
Seitenbereich: 112 - 115

Zusammenfassung

Abstract

Total organic carbon (TOC) can be one of the parameters used to determine trophic state in lakes, as shown by the statistically significant correlation between TOC and chlorophyll, total phosphorus and Secchi disk transparency. Calculation of the TSI index based on TOC according to the formula TSI(TOC) = 20.59 + 15.71 ln(TOC) and its introduction as an additional index to the classification by Carlson may optimize the comparative analysis of lakes and allow a measurable assessment of lakes with respect to the trophic gradient.

Schlüsselwörter

  • Trophic state index
  • total phosphorus
  • chlorophyll a
  • Secchi depth
  • total organic carbon

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