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Wyświetlanie 1-15 z 52
Tytuł:
Wpływ rozwarstwiania się mieszaniny woda-oleje mineralne na plankton i sanitarną ocenę jakości wody. Cz. I. Badania w warunkach laboratoryjnych
Effect of layer formation in mixtures of water with mineral-oils on the plankton and sanitary qualification of water. Part. I. Laboratory investigations
Vlijanie rassloenija Smeli voda-mineralnye masla na plankton i sanitarnuju ocenku kachestva vody. Ch. I. Issledovanija v laboratornykh uslovijakh
Autorzy:
Brzezinski, J.
Ranke-Rybicka, B.
Powiązania:
https://bibliotekanauki.pl/articles/873379.pdf
Data publikacji:
1982
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
mieszaniny
woda
oleje mineralne
plankton
jakosc wody
Źródło:
Roczniki Państwowego Zakładu Higieny; 1982, 33, 1-2
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ rozwarstwiania się mieszaniny woda-oleje mineralne na plankton i sanitarną ocenę jakości wody. Część. III. Badania hydrobiologiczne ekosystemu naturalnego, zanieczyszczanego olejami mineralnymi
Effect of dissociation of the mixture of water with mineral oils on plankton and hygienic value of water. Part. III. Hydrobiological investigations of the natural ecosystem contaminated with mineral oils
Vlijanie rassloenija Smeli voda-mineralnye masla na plankton i sanitarnuju ocenku kachestva vody. Ch. III. Gidrobiologiechskie issledovanija estesvennojj ekosistemy, zagrjaznjonnojj mineralnymi maslami
Autorzy:
Brzezinski, Z.
Ranke-Rybicka, B.
Powiązania:
https://bibliotekanauki.pl/articles/877392.pdf
Data publikacji:
1982
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
mieszaniny
woda-oleje mineralne
plankton
jakosc wody
zanieczyszczenia
hydrobiologia
Źródło:
Roczniki Państwowego Zakładu Higieny; 1982, 33, 4
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaetognatha of Drake Passage and Bransfield Straitv(December 1983-January 1984, BIOMASS-SIBEX)
Autorzy:
Bielecka, Luiza
Żmijewska, Maria I.
Powiązania:
https://bibliotekanauki.pl/articles/2052739.pdf
Data publikacji:
1993
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
plankton
Chaetognatha
Źródło:
Polish Polar Research; 1993, 14, 1; 65-74
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wstepnego ozonowania na liczebność planktonu w wodzie ujmowanej dla wodociągu " Dziećkowice"
The effect of pre-ozonation on the number of plankton organism in untreated water:A case study ..
Autorzy:
Falkus, B.
Handzlik, A.
Powiązania:
https://bibliotekanauki.pl/articles/237245.pdf
Data publikacji:
1998
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
plankton wodny
ozonowanie wody
wodociąg "Dziećkowice"
Opis:
The object under study is the Water Treatment Plant Dziećkowice ( Upper Silesia ).The treatment train includes pre-ozonation as one of the unit processes,so it seemed worthwhile to investigate how the ozone dose affected the count of plankton organisms. Thus, an ozone dose ranging between 0.8 and 1.0 gO3/m3 was able to reduce phytoplankton by about 20%.The efficiency of the pre-ozonation process depended on the number of plankton organisms in untreated water and varied from one species to another.
Źródło:
Ochrona Środowiska; 1998, 2; 41-44
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new predatory cladoceran Cercopagis (Cercopagis) pengoi (Ostroumov 1891) in the Gulf of Gdańsk
Autorzy:
Bielecka, L.
Zmijewska, M.I.
Szymborska, A.
Powiązania:
https://bibliotekanauki.pl/articles/48376.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Cercopagidae
water temperature
crustacean
plankton
Caspian Sea
Baltic Sea
zooplankton
water body
Finland Gulf
new species
Riga Gulf
Gdansk Gulf
Podonidae
Cercopagis pengoi
Opis:
Cercopagis pengoi, a species native to the Ponto-Caspian area, was recorded for the first time in the Baltic Sea in the Gulf of Riga and in the open Gulf of Finland in 1992. Sampling in the shallow coastal area of the western part of the Gulf of Gdańsk at weekly intervals between April 1999 and April 2000 revealed the presence of C. pengoi in the zooplankton community. The species was recorded twice, at densities of 1369 indiv. m−3 on 30 July 1999 and 421 indiv. m−3 on 5 August 1999, when the water temperature was at its maximum, in excess of 21.7◦C and 23.9◦C respectively. C. pengoi had never been recorded in the Gulf of Gdańsk prior to 1999.
Źródło:
Oceanologia; 2000, 42, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Abundance and species composition of plankton in the Gulf of Gdańsk near the planned underwater outfall of the Gdańsk-Wschód (Gdańsk-East) sewage treatment plant
Autorzy:
Zmijewska, M.I.
Niemkiewicz, E.
Bielecka, L.
Powiązania:
https://bibliotekanauki.pl/articles/48867.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
biomass
abundance
plankton
underwater outfall
Baltic Sea
phytoplankton
Gdansk city
coastal area
treatment plant
zooplankton
Gdansk Gulf
Vistula River
distribution
Opis:
The aim of this paper is to determine the current biological state of life in the pelagic zone of the Gulf of Gdańsk in relation to the planned start-up of an underwater outfall which will discharge sewage from the Gdańsk–Wschód (Gdańsk–East) sewage treatment plant. The plankton material was collected during two research cruises in July and October 1998. The samples were taken at 15 stations in four profiles located near Wyspa Sobieszewska (Sobieszewo Island), perpendicular to the coastline. Both the taxonomic and numerical structure of phytoplankton and zooplankton were typical of the coastal area of the Gulf of Gdańsk. The species diversity depends on hydrological conditions, mainly input from the River Wisła (Vistula). The abundance and biomass of phytoplankton in 1998 were several times lower than in 1994 and 1995 in the area off Górki Wschodnie, the profile located closest to the planned construction site. This could have been caused by generally lower temperatures in 1998 in comparison to previous years. In the investigated area only traces of algal eutrophication indicator species were noted. However, potentially toxic species were confirmed and were most abundant near the Wisła mouth. The highest concentrations of pelagic fauna occur in the shallowest area closest to the shoreline. Long-term observations of the dynamics of the variations in abundance and species composition indicate the increasing significance of one particular species – Acartia bifilosa.
Źródło:
Oceanologia; 2000, 42, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Entrapment of macroplankton in an Arctic fjord basin, Kongsfjorden, Svalbard
Autorzy:
Weslawski, J.M.
Pedersen, G.
Petersen, S.F.
Porazinski, K.
Powiązania:
https://bibliotekanauki.pl/articles/47968.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
Themisto libellula
Thysanoessa rashii
plankton concentration
Limacina helicina
Arctic fjord
Thysanoessa inermis
macroplankton
krill
Svalbard
Kongsfjorden
Opis:
This paper presents the results of 15 zooplankton tows collected with a Tucker Trawl (1 m2 opening, net of 2 mm mesh size) in Kongsfjorden (79◦N), Svalbard archipelago. The hydroacoustic survey revealed clear differences between the plankton concentrations in the outer and inner fjord basins. Plankton concentrations and fish were observed in the outer fjord, while uniformly scattered objects were detected in the inner basin. The macroplankton community was dominated by Euphausiacea (Thysanoessa inermis, Thysanoessa rashii), Amphipoda (Themisto libellula) and Pteropoda (Limacina helicina). Other taxa were of minor numerical importance. The macroplankton abundance reached 3300 indiv. 100−1 m−3 with a maximum biomass of 100 g wet weight 100−1 m−3 (over 440 kJ 100−1 m−3). L. helicina was advected into the fjord with surface waters, and was found in large abundance (1000 indiv. 100−1 m−3) in the subsurface layers of the inner basin. Euphausids were present in small numbers at the entrance to the fjord, but were found to be very abundant (600 indiv. 100−1 m−3) at the innermost stations, especially in the surface water layer. The estuarine circulation driven by the glacial meltwater discharge is believed to cause the entrapment of zooplankton in the inner fjord basin.
Źródło:
Oceanologia; 2000, 42, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Greenland whales and walruses in the Svalbard food web before and after exploitation
Autorzy:
Weslawski, J.M.
Hacquebord, L.
Stempniewicz, L.
Malinga, M.
Powiązania:
https://bibliotekanauki.pl/articles/47767.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Balaena mysticetus
food web
plankton
walrus
whale
Arctic
coastal ecosystem
Svalbard Archipelago
sea mammal
Odobaenus rosmarus rosmarus
exploitation
benthic organism
Greenland whale
Opis:
Between 1600 and 1900 two numerous and ecologically important large marine mammals were extirpated in the Svalbard archipelago. These were the pelagic-feeding Greenland whale (Balaena mysticetus) and the benthic-feeding walrus (Odobaenus rosmarus rosmarus), the initial stocks of which prior to exploitation are estimated to have numbered approximately 46 000 and 25 000 animals respectively. Their annual food consumption at that time is estimated to have been some 4 million tons of plankton and 0.4 million tons of benthic organisms. Assuming that the primary and secondary production of the shelf/coastal ecosystem in the 16th century (before the peak of the Little Ice Age) was similar to that of the present day, the authors have concluded that a major shift in the food web must have occurred after the Greenland whales and walruses were eliminated. Planktonivorous seabirds and polar cod (Boreogadus saida) very probably took advantage of the extirpation of the Greenland whales, while eiders (Somateria mollissima) and bearded seals (Erignathus barbatus) benefited from the walrus's extinction. In turn, the increased amount of pelagic fish provided food for piscivorous alcids and gulls, and may have given rise to the huge present-day seabird colonies on Svalbard.
Źródło:
Oceanologia; 2000, 42, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interannual variability in the occurrence of Themisto (Amphipoda) in the north Norwegian Sea
Autorzy:
Wencki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2052415.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic plankton
Themisto abyssorum
Themisto libellula
density
biomass
Źródło:
Polish Polar Research; 2000, 21, 3-4; 143-152
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal and diel changes in the vertical distribution in relation to the age structure of Microcalanus pygmaeus Sars and Ctenocalanus citer Bowman and Heron, (Pseudocalanidae, Copepoda) from Croker Passage (Antarctic Peninsula)
Autorzy:
Zmijewska, M.I.
Bielecka, L.
Grabowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/47951.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
zooplankton
Antarctic
coastal water
Microcalanus pygmaeus
Pseudocalanidae
vertical distribution
plankton
Ctenocalanus citer
age structure
Antarctic Peninsula
seasonal change
Copepoda
Opis:
The development of two representatives of Pseudocalanidae and the nature of their population distribution in the water column were investigated on the basis of plankton samples collected over three seasons in night-day series in Croker Passage. The investigations showed that the two species begin reproducing in different seasons. Regardless of season, the growth of M. pygmaeus is more advanced than that of C. citer. Both species are characterised by a separation of their populations in the water column. The youngest copepodite stages (I–III) inhabit the upper portion of the water in which the given species occurs, while the oldest specimens, especially males, inhabit the deepest waters. Additionally, the first growth phases (CI–CIII) show a tendency to concentrate closer to the surface at night.
Źródło:
Oceanologia; 2000, 42, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of zooplankton mortality caused by an Arctic glacier outflow
Autorzy:
Zajaczkowski, M.J.
Legezynska, J.
Powiązania:
https://bibliotekanauki.pl/articles/47423.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
water column
marine plankton
Arctic
zooplankton
marine organism
glacier outflow
fresh water
osmotic shock
mortality
Opis:
The outflow of freshwater from underwater channels in the Kongsbreen tidal glacier in Kongsfjorden, Svalbard, 79◦ N, was measured as 138.8 m3 s−1 at the peak of the melting season. Experiments on local marine plankton mortality show that when exposed to salinities below 9 PSU, all copepods die within 15 minutes. We estimate that during 100 days of the melting season, as many as 85 tonnes wet weight (WW) of plankton is removed from the water column due to osmotic shock, which makes up 15% of the standing zooplankton biomass of the fjord. The dead zooplankton sinks after exposure to low salinities and is probably an important food source for scavenging benthic fauna in the fjord. This mechanism could be responsible for the high numbers of Onisimus caricus near the glacier front.
Źródło:
Oceanologia; 2001, 43, 3; 341-351
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metal pollutants and radionuclides in the Baltic Sea - an overview
Autorzy:
Szefer, P.
Powiązania:
https://bibliotekanauki.pl/articles/48734.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
fish
trace element
metal pollutant
suspended matter
plankton
zoobenthos
sea water
Baltic Sea
biomonitor
chemical balance
marine mammal
radionuclide
pollution
metal
Baltic ecosystem
Opis:
This overview presents in detail the state of knowledge of the abilities of various components of the Baltic Sea environment to accumulate trace elements and radionuclides. Particular components of the Baltic ecosystem (abiotic and biotic) are considered as potential monitors of pollutants. The use of seaweeds, e.g. Fucus vesiculosus or Zostera marina is recommended, also molluscs, e.g. Mytilus edulis, for biomonitoring surveys of metal pollutants and radionuclides in the Baltic Sea. However, several requirements need to be met if results are to be reliable. Since metal levels and radionuclide activities in the growing tips of F. vesiculosus reflect exclusively the levels of their dissolved species in the ambient seawater, this alga is very useful for monitoring dissolved species of metal pollutants and radioisotopes in the Baltic ecosystem. In contrast, M. edulis, a filter feeder is an appropriate tool for monitoring trace elements occurring in both chemical forms, i.e. dissolved and suspended species. Therefore, full information on the bioavailability and toxicity of heavy metals (depending on their chemical speciation) as pollutants of the Baltic Sea can be obtained if at least two biomonitoring organisms are applied simultaneously, e.g. F. vesiculosus and M. edulis. Moreover, the data matrix can be interpreted more accurately if not only trace element but also macroelement concentrations (Ca, Mg, Na, K) in these two representatives of Baltic phytoand zoobenthos are taken into consideration; this point requires special attention. Two coastal species of fish, i.e. Zoarces viviparus and Perca fluviatilis, are good biomonitors of metallic contaminants, so their use as sentinels is recommended. The budgets of chemical elements and the ecological status of the Baltic Sea are presented. Several ‘blacksp ots’, e.g. large estuaries and seaport towns, heavily polluted by trace elements, are identified in the Baltic Sea and other enclosed seas such the Mediterranean and the BlackS eas. Of these seas, the Baltic is the most heavily loaded with trace elements and organic pollutants. The overview identifies gaps in our environmental knowledge of the Baltic Sea, and sets out possible priorities, key areas or strategies for future research.
Źródło:
Oceanologia; 2002, 44, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The fine structure of marine hydrophysical fields and its influence on the behaviour of plankton: an overview of some experimental and theoretical investigations
Autorzy:
Druet, C.
Powiązania:
https://bibliotekanauki.pl/articles/48011.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
turbulence
zooplankton
behaviour
temperature
euphotic zone
hydrophysical property
plankton
marine plankton
phytoplankton
hydrophysical field
Opis:
This article is an overview which presents in brief some of the results of research done in the last 20 years on the structure and dynamics of intermittent fine structure in the euphotic zone of the sea and its effect on the behaviour of marine plankton. The introduction provides a general characterisation of this structure and its relations with the plankton concentration field. Chapter 2 covers turbulent mixing processes in layers of homogeneous fine structure,and discusses the dynamic interactions of these layers and how these affect the behaviour of marine phyto- and zooplankton. The principal conclusions,in brief, are that the current state of knowledge,no t only of intermittent fine structure itself and its dynamic transformations,but also of the influence of these processes on the behaviour of marine plankton,i s today still a long way from permitting an accurate description of reality. Moreover,b oth empirical investigations (in situ and in the laboratory) and mathematical modelling,despite the quite advanced stage that the latter has reached,need to be continued. For this reason the prime aim of this article is to show up the gaps in our knowledge which future research in this complex,in terdisciplinary area of oceanography should attempt to fill.
Źródło:
Oceanologia; 2003, 45, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of increasing uncontrolled recreation on the structure of plankton and macrophyte communities in the tunnel-valley lakes located in agricultural catchment area
Autorzy:
Kuczynska-Kippen, N
Messyasz, B.
Nagengast, B.
Powiązania:
https://bibliotekanauki.pl/articles/878149.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
zooplankton
increasing eutrophication
tunnel-valley lake
blue-green alga
macrophyte community
plankton
agricultural catchment
phytoplankton
hydrobiology
catchment area
eutrophication
Opis:
In the years 1993-1995 biological research was carried out on three lakes, which are situated in a typical agricultural catchment area, along the Gołaniecka River. The hydrobiological examination carried out in 1993 revealed a stable state of eutrophy on these lakes. At that time neither of the Bukowieckie lakes was used for recreation, while at the Kobyleckie lake there were a number of buildings, including private holiday homes and holiday camps. In 1995, the year finishing the examination, recreation housing began to develop at the Bukowieckie Du?e lake and also an acceleration of tourism was observed on the Kobyleckie lake. In the spring and summer of 2000 hydrobiological research was repeated in order to find out whether the changes in the neighbourhood of the lakes had affected the chemical condition of lake waters. Although the building area by the lakes was still unfinished, particular changes of many parameters of water were already observed. Negative effects of trophic status were noted in the decrease of the visibility of water, increase of the nutrients concentration, in the outstanding blue-green algae character of the spring phytoplankton (Aphanizomenon issatschenkoi (Ussac.) Proschkina-Lavrenko; Planktothrix agardhii (Gom.) Anagn. et Kom.; Limnothrix redekei (Van Goor) Meffert) and zooplankton (Keratella cochlearis f. tecta (Lauterborn), K. quadrata (O.F. Müller), Anuraeopsis fissa (Gosse), Bosmina longirostris (O.F. Müller) and Chydorus sphaericus (O.F. Müller)), the increase of the total densities of zooplankton with the dominance of rotifers, the impoverishment of the phytolittoral, as well as quality and quantity changes in the structure of macrophytes.
W latach 1993-1995 przeprowadzono badania biologiczne na jeziorach: Bukowieckim Du- żym, Bukowieckim Małym i Kobyleckim, położonych w obrebie typowej zlewni rolniczej, wzdłuż Strugi Gołanieckiej. Badania hydrobiologiczne przeprowadzone w 1993 roku swiadczyły o stabilnym stanie eutrofii w tych jeziorach. W tym czasie ?adne z jezior Bukowieckich nie było wykorzystywane rekreacyjnie, podczas gdy nad Jeziorem Kobyleckim wystepowała zabudowa obejmujaca domki letniskowe i kempingi. W 1995 roku, po zakonczeniu badan, rozpoczeła sie budowa domków rekreacyjnych nad Jeziorem Bukowieckim Dużym, zaobserwowano także wzrost rekreacji nad Jeziorem Kobyleckim. W okresie wiosennym i letnim 2000 roku powtórzono badania hydrobiologiczne w celu stwierdzenia, czy zmiany w sasiedztwie jezior miały wpływ na parametry chemiczne ich wód. Chocia? zabudowa nad jeziorami nie była jeszcze zakonczona, zaobserwowano zmiany kilku parametrów wody badanych jezior (tab. 2). Głównym celem przeprowadzonych badan był opis istotnych zmian jakosciowych i ilosciowych parametrów fizyczno-chemicznych i biologicznych, ze szczególnym odniesieniem do aspektów dotyczacych wzrostu poziomu trofii badanych zbiorników. Negatywne efekty w stanie trofii były zwiazane ze zmniejszajaca sie przezroczystoscia wody, wzrostem koncentracji biogenów, wybitnie sinicowym charakterem fitoplanktonu wiosennego (Aphanizomenon issatschenkoi (Ussac.) Proschkina-Lavrenko; Planktothrix agardhii (Gom.) Anagn. et Kom.; Limnothrix redekei (Van Goor) Meffert) i zooplanktonem (Keratella cochlearis f. tecta (Lauterborn), K. quadrata (O. F. Müller), Anuraeopsis fissa (Gosse), Bosmina longirostris (O.F. Müller) and Chydorus sphaericus (O.F. Müller)), wzrostem całkowitej liczebnosci zooplanktonu z dominacja wrotków (tab. 3, ryc. 1, 2), zniszczeniami w strefie fitolitoralu i zmianami jakosciowymi i ilosciowymi w strukturze makrofitów (tab. 4).
Źródło:
Roczniki Akademii Rolniczej w Poznaniu. Botanika; 2003, 06
1508-9193
Pojawia się w:
Roczniki Akademii Rolniczej w Poznaniu. Botanika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eutrophication problems in the Western Harbour of Alexandria, Egypt
Autorzy:
Dorgham, M.M.
Abdel-Aziz, N.E.
El-Deeb, K.Z.
Okbah, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/49044.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
biomass
nutrient
water quality
Alexandria Western Harbour
plankton
salinity
Egypt
eutrophication
Opis:
Eutrophication-related problems in the Western Harbour ofA lexandria were studied monthly from April 1999 to March 2000. Variation in salinity appeared to be the key to all changes in water quality and plankton abundance in the harbour. Both at the surface and near the bottom the salinity was lower (annual average: 35.1 and 38.3 PSU respectively) than in the open sea (39 PSU). Dissolved oxygen levels indicated poor aeration conditions along the water column (2.3–3.98 mg l−1). Average pH values were approximately similar in the two layers (8.1 and 8 respectively) but exhibited different ranges ofv ariations. Nutrient salts varied widely, often occurring in high concentrations, with ranges of 0.12–5.7 and 0.06–2.6 μM at the surface and the bottom respectively for phosphate, 0.21–20.46 and 0.25–18.12 μM for nitrate, 0.29–3.3 and 0.23–1.66 μM f or nitrite, 0.56–57.46 and 2.32–43.73 μM for ammonia and 0.3–36.3 and 0.48–38.4 μM for silicate. As a result ofn utrient enrichment, phytoplankton growth was very intensive, reflected by an abnormally high concentration ofc hlorophyll a (annual average: 33.82 μg l−1). At the same time the death ofl arge numbers ofp hytoplankton cells could be inferred from the relatively large amount of phaeopigment (annual average: 10.39 μg l−1). The high levels ofn utrient salts and phytoplankton biomass together serve as a good indicator ofhig h eutrophication levels in the Western Harbour throughout the year. These conditions clearly affected the zooplankton stock, which varied between 5.8–93.6×103 indiv. m−3, although for most of the time values remained at a low level (annual average: 26 728 indiv. m−3).
Źródło:
Oceanologia; 2004, 46, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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