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1

Seasonal and daily distribution of commercial and non-commercial fish in shallow inshore waters of the Gulf of Gdansk

100%
Lizinska A.
Oceanological Studies
|
2002
|
vol. 31
|
issue 1-2
31-42
EN
Seasonal and daily changes in the fish community and variations between commercial and non-commercial fish abundance were monitored in the inshore waters of the western part of the Gulf of Gdask (the Sopot territory). Samples were collected from December 1998 to December 1999, though monthly samplings, and supplemented by 24-hour investigations taken every three months, using a two-meter wide trawl. Among the 16 species collected, 5 were commercial and 11 were non-commercial. Juvenile forms of herring and flounder dominated the commercial fish; the highest catches were in March (89 ind. 100 m-2). Among the non-commercial fish, two species of Gobiidae (sand and common goby), and three-spine stickleback were most frequently caught. During the 24hour observations, commercial fish were noticed mostly at night. The investigated area is an important zone for both juvenile commercial fish and some ecologically important uncomercial species.
2

Macrozoobenthos of the sandy littoral zone in the military area between Hel and Jurata

100%
Kotwicki L., Wlodarska-Kowalczuk M., Wieczorek P.
|
|
issue 3-4
97-107
EN
The aim of the study was to determine the distribution, composition and seasonal variability of macrozoobenthos in the sandy littoral zone of the military area between Hel and Jurata. The results of qualitative and quantitative investigations of the benthic fauna are presented. The material was collected monthly from November 1991 till November 1992 at 10 stations situated in the sandy littoral zone (0.5-1 m depth) on the Puck Bay shore of the Hel Peninsula. A total of 17 macrofaunal taxa were identified. At each station 2 or 3 subsamples were collected with a 225 cm2 Petersen grab. The average abundance and wet weight of particular taxa were calculated. Bathyporeia pilosa, Hediste diversicolor and Oligochaeta were most frequent taxa in the study area. Polychaeta and Bivalvia constituted up to 93% of the bottom fauna biomass, Hediste diversicolor was the dominant species.
3

Endopsammic algal communities from shallow littoral sediments of Lobelia lake (the Pomeranian Lakeland, Northern Poland)

100%
Picinska_Faltynowicz J.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
51-67
EN
Endopsammic algal communities from shallow littoral sediments in a subeutrophic Lobelia lake are presented. The flora in the studied lake consisted of 492 taxa. During the two years of study, the density of algae fluctuated between 0.65x103 and 23.24x103 individuals in 1 cm3 of sand and resulted mainly from growth of cyanobacteria, green algae and diatoms. The poorest communities occurred in spring, the most abundant in summer and autumn. In 1985, cyanophytes dominated (up to 92%) and Aphanotece microscopica in particular; the latter species grew in masses, particularly in summer and constituted more than 50% to 64% of the total quantity. In the next year, greater abundance of green algae, diatoms and desmids was noted, probably owing to the higher concentration of nutrients in interstitial water. The most suitable conditions for algal growth created sediments of flat bottom stabilized by isoetids. Mass development of certain cyanobacteria species resulted from medium trophy of the lake.
4

Temporal variations in phosphorus species in the surface layer of bottom sediments from the Gulf of Gdansk - preliminary research

100%
Graca B., Bolalek B. J., Bolalek J.
|
EN
Temporal variations in phosphorus species [total phosphorus (Ptot), organic phosphorus (Porg), total inorganic phosphorus (Pmin), phosphorus bound to calcium (PCa), aluminium (PAl) and iron (PFe)] were studied in the surface layer of bottom sediments from the Gulf of Gda?sk. These changes were caused mainly by variability in Porg, PAl and PFe concentrations and were closely related to the growth cycle in the basin. The phosphorus concentration was higher in the spring and summer (April - September) that in the autumn and winter (November-March). For much of the year concentrations of Pmin were higher than those of organic phosphorus. The prevalent form of inorganic phosphorus was PCa, whose concentrations exceeded those of iron- and aluminium-bound phosphorus.
5

Nutrients and oxygen in the Gulf of Gdansk

75%
Falkowska L., Bolalek J., Nowacki J.
Oceanological Studies
|
1993
|
issue 64/3
131-162
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