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Wyszukujesz frazę "Arctic plankton" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    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:
    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:
    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
      Wyświetlanie 1-4 z 4

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