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1

The Antarctic Cyclopoid Oncaea Antarctica - some aspects of its biology and ecology

100%
Bielecka L., Zmijewska M. I.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
149-163
EN
The biology and ecology of an Antarctic species Oncaea antarctica, which belongs to the Cyclopoida, was reconstructed from analyses of vertically-stratified zooplankton sets of samples taken with a 150 *m and 250 *m-mesh net during the day and at night, during 3 austral seasons (sum-mer - December 1985, autumn - April 1988, winter - June-August 1989). The plankton material was collected at stations located in Croker Passage (Antarctic Peninsula). Inhabiting meso- and bathypelagic waters, O. antarctica was one of the most numerous cyclopoids of the family Oncaeidae, making up 50% of all Cyclopoida in winter. Females carrying egg sacs and copulating pairs of this species were present during all three seasons investigated.
2

Copepoda (Cyclopoida) from the Croker Passage (Antarctica, June-August, 1989)

99%
Bielecka L.
Oceanological Studies
|
1993
|
issue 64/3
215-224
3

The time-space variability of Copepoda from the Pseudocalanidae family in Croker Passage (Antarctic Peninsula)

81%
Zmijewska M. I., Grabowska A., Bielecka L.
|
|
issue 3-4
75-84
EN
Owing to their large numbers, small Calanoida from the Pseudocalanidae family constitute a significant element of zooplankton in seas and oceans. In Croker Passage, which is in the coastal zone of the Antarctic Peninsula, this family is represented by Microcalanus pygmaeus and Ctenocalanus citer. These species are characterized by a distinct seasonal variability in numbers and by the way they inhabit the water column. M. pygmaeus occurs five to six times more frequently than C. citer, and both species are far more abundant in summer than in winter. In summer they occur in the upper part of the mesopelagic zone, while in winter they move to greater depths. However, C. citer occurs more often than M. pygmaeus in the upper layers of the water column, regardless of season.
4

The effect of sex ratio on the population pattern and abundance of the predominant Antarctic Coppoda in croker passage

81%
Zmijewska M. I., Yen J., Bielecka L., Blachowiak-Smakolyk K.
Oceanological Studies
|
1997
|
vol. 26
|
issue 1
127-149
EN
Population structure analysis of five of the most abundant Calanoida species showed their life strategy to be highly individual, even between animals belonging to the same trophic levels. In phytophages, such as C. acutus, sex determination began in autumn, earlier in females than in males. Males generally, rather low in abundance, were present for a relatively short time of the year. They occurred in the deepest part of the water column, where fertilisation should take place. A similar pattern of reproductive peaks was observed in C. propinquus, though males were not so scarce as in the former species and adults were present in the entire water column, so fertilisation was possible everywhere. The population of R. gigas showed the presence of two generations per year. Females pre-dominate among adults. In summer, fertilisation occurred in the epipelagic water layer, while in winter it descended to the bathypelagic water. In M. gerlachei sex determination seems to be an ongoing process. Fertilisation takes place in the deepest part of the water column, thus indicating the bulk presence of males, while females were distributed nearly evenly throughout the water column, except for the surface layers. E. antarctica - a predator - started to breed in winter. The predominant females were often ob-served with a few spermatophores; this suggests that females can survive longer than males.
5

The seasonal and short-term variability of zooplankton taxonomic composition in the shallow coastal area of the Gulf of Gdansk

61%
Bielecka L., Gaj G. M., Gaj M., Mudrak M. S., Mudrak S., Zmijewska Z. M. I., Zmijewska M. I.
Oceanological Studies
|
2000
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vol. 29
|
issue 1
57-76
EN
Seasonal and short-term variability of zooplankton taxonomic composition in the shallow coastal area of the Gulf of Gdansk was reconstructed from analyses of material collected at weekly intervals between March 1998 and March 1999, using a Kopenhagen net with a 50 ?m-mesh size. Water temperature was also measured during the investigations, which enabled precise monitoring of the seasonality in the area. The contribution of a particular species and its density varied seasonally and, in the majority of cases, even weekly. On the one hand, the diversity and instability of particular zooplankton components were observed; on the other hand, though, the long-term presence and domination of species commonly inhabiting the waters of the Gulf of Gdansk (Acartia spp.) were confirmed to be independent of environmental conditions, especially, temperature. Frequent plankton catches resulted in identification of periods of fast qualitative changes within zooplankton and precise definition of the time when a particular taxon occurs. The time of dominance in major taxonomic zooplankton groups lasted: Tintinnina - 17 weeks, Rotatoria - 9 weeks, Copepoda - 2 weeks. Cladocera never was a dominant taxon.
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