A radiotracer study of zooplankton grazing in two small humic lakes

1988 ◽  
Vol 23 (1) ◽  
pp. 462-469
Author(s):  
Kalevi Salonen ◽  
Lauri Arvola
Keyword(s):  
Zooplankton Grazing ◽  
Humic Lakes ◽  
Radiotracer Study

scholarly journals How to Assess the Ecological Status of Highly Humic Lakes? Development of a New Method Based on Benthic Invertebrates

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 223
Author(s):  
Dāvis Ozoliņš ◽  
Agnija Skuja ◽  
Jolanta Jēkabsone ◽  
Ilga Kokorite ◽  
Andris Avotins ◽  
...  
Keyword(s):  
Ecological Status ◽  
Working Party ◽  
Nutrient Content ◽  
Humic Lakes ◽  
Raised Bog ◽  
Raised Bogs ◽  
Taxa Richness ◽  
Bog Lakes ◽  
Status Assessment

Highly humic lakes are typical for the boreal zone. These unique ecosystems are characterised as relatively undisturbed habitats with brown water, high acidity, low nutrient content and lack of macrophytes. Current lake assessment methods are not appropriate for ecological assessment of highly humic lakes because of their unique properties and differing human pressures acting on these ecosystems. This study proposes a new approach suitable for the ecological status assessment of highly humic lakes impacted by hydrological modifications. Altogether, 52 macroinvertebrate samples from 15 raised bog lakes were used to develop the method. The studied lakes are located in the raised bogs at the central and eastern parts of Latvia. Altered water level was found as the main threat to the humic lake habitats since no other pressures were established. A multimetric index based on macroinvertebrate abundance, littoral and profundal preferences, Coleoptera taxa richness and the Biological Monitoring Working Party (BMWP) Score is suggested as the most suitable tool to assess the ecological quality of the highly humic lakes.

scholarly journals Different Roles of Top-Down and Bottom-Up Processes in the Distribution of Size-Fractionated Phytoplankton in Gwangyang Bay

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1682
Author(s):  
Yoonja Kang ◽  
Yeongji Oh
Keyword(s):  
Nutrient Availability ◽  
Fast Response ◽  
Nutrient Addition ◽  
The Other ◽  
Zooplankton Grazing ◽  
Top Down ◽  
Bottom Up ◽  
Phytoplankton Distribution ◽  
Summer Bloom ◽  
Gwangyang Bay

The interactive roles of zooplankton grazing (top-down) and nutrient (bottom-up) processes on phytoplankton distribution in a temperate estuary were investigated via dilution and nutrient addition experiments. The responses of size-fractionated phytoplankton and major phytoplankton groups, as determined by flow cytometry, were examined in association with zooplankton grazing and nutrient availability. The summer bloom was attributed to nanoplankton, and microplankton was largely responsible for the winter bloom, whereas the picoplankton biomass was relatively consistent throughout the sampling periods, except for the fall. The nutrient addition experiments illustrated that nanoplankton responded more quickly to phosphate than the other groups in the summer, whereas microplankton had a faster response to most nutrients in the winter. The dilution experiments ascribed that the grazing mortality rates of eukaryotes were low compared to those of the other groups, whereas autotrophic cyanobacteria were more palatable to zooplankton than cryptophytes and eukaryotes. Our experimental results indicate that efficient escape from zooplankton grazing and fast response to nutrient availability synergistically caused the microplankton to bloom in the winter, whereas the bottom-up process (i.e., the phosphate effect) largely governed the nanoplankton bloom in the summer.

The behaviour of iron electrode in CO2− saturated neutral electrolyte—II. Radiotracer study and corrosion considerations

1983 ◽  
Vol 28 (11) ◽  
pp. 1627-1633 ◽  
Author(s):  
Andrzej Wiȩckowski ◽  
Edward Ghali ◽  
Marek Szklarczyk ◽  
Jerzy Sobkowski
Keyword(s):  
Iron Electrode ◽  
Neutral Electrolyte ◽  
Radiotracer Study

scholarly journals A new sensitive tracer for the determination of zooplankton grazing activity

1996 ◽  
Vol 18 (8) ◽  
pp. 1513-1518 ◽  
Author(s):  
Rik L.J. Kwint ◽  
Kees J.M. Kramer
Keyword(s):  
Zooplankton Grazing

Adsorption from solution on platinum: an in situ FTIR and radiotracer study

Langmuir ◽  
1986 ◽  
Vol 2 (4) ◽  
pp. 393-405 ◽  
Author(s):  
P. Zelenay ◽  
M. A. Habib ◽  
J. O. Bockris
Keyword(s):  
In Situ Ftir ◽  
Adsorption From Solution ◽  
Radiotracer Study

Zooplankton Grazing During the Zebra Mussel ( Dreissena polymorpha ) Colonization of Saginaw Bay, Lake Huron

1995 ◽  
Vol 21 (4) ◽  
pp. 567-573 ◽  
Author(s):  
Thomas B. Bridgeman ◽  
Gary L. Fahnenstiel ◽  
Gregory A. Lang ◽  
Thomas F. Nalepa
Keyword(s):  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Lake Huron ◽  
Zooplankton Grazing ◽  
Saginaw Bay

Use of fatty acids for the assessment of zooplankton grazing on bacteria, protozoans and microalgae

1997 ◽  
Vol 38 (3) ◽  
pp. 629-637 ◽  
Author(s):  
CH. DESVILETTES ◽  
G. BOURDIER ◽  
CH. AMBLARD ◽  
B. BARTH
Keyword(s):  
Fatty Acids ◽  
Zooplankton Grazing

scholarly journals A stochastic, Lagrangian model of sinking biogenic aggregates in the ocean (SLAMS 1.0): model formulation, validation and sensitivity

2016 ◽  
Vol 9 (4) ◽  
pp. 1455-1476 ◽  
Author(s):  
Tinna Jokulsdottir ◽  
David Archer
Keyword(s):  
Primary Production ◽  
Degradation Kinetics ◽  
Mechanistic Model ◽  
Euphotic Zone ◽  
Lagrangian Model ◽  
Zooplankton Grazing ◽  
Aggregate Model ◽  
Size Spectra ◽  
Sea Floor ◽  
Individual Particles

Abstract. We present a new mechanistic model, stochastic, Lagrangian aggregate model of sinking particles (SLAMS) for the biological pump in the ocean, which tracks the evolution of individual particles as they aggregate, disaggregate, sink, and are altered by chemical and biological processes. SLAMS considers the impacts of ballasting by mineral phases, binding of aggregates by transparent exopolymer particles (TEP), zooplankton grazing and the fractal geometry (porosity) of the aggregates. Parameterizations for age-dependent organic carbon (orgC) degradation kinetics, and disaggregation driven by zooplankton grazing and TEP degradation, are motivated by observed particle fluxes and size spectra throughout the water column. The model is able to explain observed variations in orgC export efficiency and rain ratio from the euphotic zone and to the sea floor as driven by sea surface temperature and the primary production rate and seasonality of primary production. The model provides a new mechanistic framework with which to predict future changes on the flux attenuation of orgC in response to climate change forcing.

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