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Wyświetlanie 1-2 z 2
Tytuł:
Phytoplankton composition in the Maltanski Reservoir and the lowest part of the Cybina River
Autorzy:
Kozak, A.
Graf, M.
Powiązania:
https://bibliotekanauki.pl/articles/878404.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Przyrodniczy w Poznaniu
Tematy:
phytoplankton
species composition
abundance
biomass
restoration
Maltanski Reservoir
Cybina River
Opis:
Phytoplankton composition was analysed in the Maltański Reservoir and the inlet and outlet of the Cybina River. Samples were collected from three sampling stations in November 2007, February, May and August 2008. Considerable changes in the qualitative and quantitative composition of the phytoplankton in the infl owing and outfl owing water and in the central part of the reservoir were noted. Among 142 taxa chlorophytes were the most numerous group. There were also groups represented by the large values of phytoplankton abundance and biomass such as Cyanobacteria in autumn, chrysophytes in winter, diatoms and cryptophytes in spring and chlorophytes in summer. The diff erences in the qualitative and quantitative composition of the phytoplankton among the analysed sampling stations were noticed. The species composition of the potamoplankton was changing as it passed through the reservoir along the course of the river. With regard to all seasons the lowest number of taxa were noticed in samples from the inlet. The most diversifi ed was phytoplankton composition in the reservoir. The highest similarity between the analysed stations was observed in the phytoplankton composition in the reservoir and outlet of the river from this reservoir.
Źródło:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2013, 17
1896-1908
Pojawia się w:
Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vimba Vimba vimba (L.) from the Rega River - support of natural spawning in 2004-2008 and the natural population
Certa Vimba vimba (L.) z rzeki Regi - wspieranie naturalnego tarła w latach 2005-2008 a naturalna polpulacja
Autorzy:
Tanski, A.
Czerniejewski, P.
Keszka, S.
Pender, R.
Pilch, E.
Powiązania:
https://bibliotekanauki.pl/articles/85115.pdf
Data publikacji:
2011
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
vimba
Vimba vimba
Rega River
natural spawning
natural population
biogeography
threatened species
stocking
restoration
spawning site
Opis:
The paper reports results of a study on the population of vimba in the Rega River aimed at localisation of the spawning sites and support of the natural reproduction by stocking. The spawning sites were localised with the help of electric catching and the coordinates were determined by GPS units. The fish caught to be used for artificial spawning (145 individuals) were measured (l.t. and l.c.) using an electronic calliper coupled with a PC unit. The sex of the fish was identified and on the basis of scale analysis the age and rate of length and mass increase were estimated. The backcalculation readings were made using the Rosa Lee method. The model of growth was established on the basis of the von Bertalanffy formula. Comparisons of groups of fish were drawn with the help of the nonparametric Mann Whitney U test. Correlations between variables were evaluated by analysis of regression, while the significance of the correlation coefficient was checked by t test. The rate of vimba mass increase was calculated using the modified von Bertalanffy formula was found to be described by Wt = 1215.103[1-e-0.133609(t+0.57322)]2.7559. The spawning sites of vimba localised in the Rega River section between Gryfice and Trzebiatow were concluded to be good sources of spawners for artificial spawning and the number of spawners caught in this section of the river ensures continuation of vimba restitution in the Rega River. The hitherto stocking measures aimed at restoration of vimba population have brought satisfactory results as evidenced by the age structure of the fish caught in the electric fishing in 2008.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2011, 15
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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