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1

Phototaxis, gravitaxis and vertical migrations in the marine dinoflagellates, Peridinium faeroense and Amphidinium caterea

100%
Hader D.-P.
Acta Protozoologica
|
1991
|
tom 30
|
nr 2
2

Studies on horizontal and vertical migration of 90Sr in soil systems

100%
Solecki J., Chibowski S.
Polish Journal of Environmental Studies
|
2002
|
tom 11
|
nr 2
Here are presented results of studies on vertical and horizontal migration of strontium 90Sr isotope in soil systems of Bug river valleys. Mean radioactivity of strontium in these soils was 26.15 ± 22.2 Bq/kg. Atmospheric precipitation of strontium on this area was 0.35 kBq/m2/cm. Radioactivity in soil profiles ranged from 17 to 130 Bq/m2/cm and the isotope was detected even at 30 cm depth. Some tendency to vertical migration of strontium towards the river was noticed. Obtained results were compared with concentrations of calcium and strontium in the soil. Any clear influence of these elements on the migration of strontium 90Sr was noticed.
3

Vertical migrations of krill [Euphausia superba Dana]

84%
Godlewska M.
Polskie Archiwum Hydrobiologii
|
1996
|
tom 43
|
nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

An Autonomous Hydroacoustic System for studying long-term scattering variability

84%
Szczucka J., Groza K., Porazinski K.
Oceanologia
|
2002
|
tom 44
|
nr 1
A new instrument, an Autonomous Hydroacoustic System, was designed to probe a water column acoustically from the bottom to the sea surface. It is capable of operating from a depth of 100 m self sufficiently for up to 10 days. A brief description of its construction and electronic design is provided. Preliminary results from the first field study consisting of a 90-hour series of backscattering measurements are presented.
5

Evidences of zooplankton vertical migration in stocked and never-stocked Alpine lakes in Gran Paradiso National Park (Italy)

67%
Tiberti R., Barbieri M.
Oceanological and Hydrobiological Studies
|
2011
|
tom 40
|
nr 3
6

Response of rotifers to hydrochemical and biotic factors

67%
Zurek R.
Oceanological and Hydrobiological Studies
|
2006
|
tom 35
|
nr 2
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Acoustically measured diurnal vertical migration of fish and zooplankton in the Baltic Sea - seasonal variations

67%
Szczucka J.
Oceanologia
|
2000
|
tom 42
|
nr 1
Acoustic measurements were conducted at different seasons in the last five years at a fixed point of the Baltic Sea at a frequency 30 kHzcon currently with temperature and salinity sampling. Echosounding records were used to determine the seasonal and diurnal migration patterns of scattering layers in accordance with thermohaline conditions. Different seasonal patterns of nocturnal aggregations of organisms dependent on the temperature gradient in the thermocline were found. This paper illustrates the diurnal distributions of sound scattering layers and analyses the way they are linked to the physical structure of the water.
8

Daphnia: model herbivore, predator and prey

59%
Lampert W.
Polish Journal of Ecology
|
2006
|
tom 54
|
nr 4
In the past 30 years, Daphnia has become a model organism in aquatic ecology. I review the changing concepts and paradigms in plankton ecology as reflected in the work on Daphnia. The availability of radiotracers favoured a new physiological approach that resulted in better energetic models and more reliable estimates of filtering rates. This led to deeper insights into the role of herbivore grazing on phytoplankton and microbial communities, and nutrient recycling. It provided a conceptual basis for general hypotheses on predictable seasonal successions (e.g. the PEG model). On the other hand, increasing knowledge about selective predation on zooplankton triggered population dynamic models and gave explanations for changing community structures. The Size-Efficiency-Hypothesis generated a framework for studies on trade-offs between competitive ability and susceptibility to predation. Daphnia was now in the centre of interaction-based concepts, being predator and prey at the same time. It was the backbone of practical applications of the theory in food-web manipulations. When ultimate factors came into the focus, Daphnia played an important role in explaining striking phenomena like diel vertical migration and cyclomorphosis. Its central position in food-webs, the unique propagation mode, easy cultivation and accessibility by molecular genetic methods made it a favourite object for studies in evolutionary ecology, concerning local ad a ptation, evolution of defences and life histories, induced phenotypic change, and genetic diversity. The large advantage of Daphnia over other biological model organisms is that its importance in pelagic freshwater systems is undoubtedly known. Hence there is a direct way of applying the results to ecological systems.
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