Spatial and seasonal variability of pore water phosphorus concentration in shallow Lake Swarzędzkie, Poland

2011 ◽  
Vol 184 (3) ◽  
pp. 1509-1516 ◽  
Author(s):  
Katarzyna Kowalczewska-Madura ◽  
Ryszard Gołdyn
Keyword(s):  
Pore Water ◽  
Shallow Lake ◽  
Seasonal Variability ◽  
Phosphorus Concentration

The sediment akinete bank links past and future blooms of Nostocales in a shallow lake

2020 ◽  
Author(s):  
Lilen Yema ◽  
Inés O'farrell ◽  
Paula de Tezanos Pinto
Keyword(s):  
Shallow Lake ◽  
Morphological Analysis ◽  
Water Quality Management ◽  
Sufficient Conditions ◽  
Good Method ◽  
Abundant Species ◽  
Phosphorus Concentration ◽  
Cyanobacteria Blooms ◽  
Germination Experiment ◽  
Positive Effect

Abstract In this paper we analyzed how well the akinete bank in the sediments from a shallow lake reflected past blooms of planktonic Nostocales (cyanobacteria), the akinete bank’s potential for reflecting future blooms and whether different nutrient scenarios affect germination and recruitment using a laboratory experiment. Most species found in the plankton were also found in the akinete bank and in the germination experiment. Based on their shape, the most abundant viable akinetes in the sediments potentially corresponded to some of the species forming intense blooms in previous years, and coincided with the most abundant species in a 3-week germination experiment. The effects of nutrients on germination and recruitment were only observed in the early phase of the life cycle (Day 7), where nitrogen-sufficient conditions enhanced germination, while phosphorus concentration had a positive effect on the number of heterocytes. Combined approaches of morphological analysis and experimental germination seem a good method for assessing the past diversity of Nostocales and allowing predictions of the diversity of potential future blooms in shallow lakes and as a tool for water quality management, especially in water bodies lacking information on previous cyanobacteria blooms.

Nutrients in the sediments of a tropical north-eastern Australian estuary, catchment and nearshore coastal zone

1993 ◽  
Vol 44 (6) ◽  
pp. 845 ◽  
Author(s):  
B Eyre
Keyword(s):  
Seasonal Variability ◽  
River Estuary ◽  
Agricultural Practices ◽  
Distribution Patterns ◽  
Phosphorus Concentration ◽  
Wet Season ◽  
Sediment Phosphorus ◽  
Anthropogenic Inputs ◽  
Nitrogen Concentrations ◽  
Australian Estuary

The distribution, transport, accumulation, modification and seasonal variability of sediment nutrients was studied in the Moresby River Estuary, catchment and nearshore zone. Phosphorus was examined by using a quick and analytically simple three-stage sequential extraction scheme that allows for natural environmental processes and differences in bio- availability. Elevated sediment phosphorus concentrations in the catchment during the wet season reflect the application of phosphate fertilizers to the agricultural lands that dominate the catchment. It is suggested that the dispersion and seasonal variability in concentration and distribution of phosphorus are controlled by sedimentary processes (e.g. erosion and transport of sediment) that are intimately linked to hydrological conditions. The physical processes that operate on a time-scale of hours (e.g, tidal currents) dominate sediment phosphorus concentration in the estuary and preclude chemical and biological equilibrium from becoming established in the sediment phosphorus along the length of the estuary. Elevated sediment total Kjeldahl nitrogen concentrations in the catchment reflect the application of nitrogenous fertilizers (mainly urea). The nitrogen distribution patterns differ from those of phosphorus, suggesting that different processes operate to control sediment nitrogen and sediment phosphorus. Low phosphorus concentrations in the sediments suggest that agricultural practices in the catchment and associated anthropogenic inputs are having little, if any, impact on the catchment, river and estuary.

Seasonal variability in the quantitative structure of the digestive tubules ofLittorina littorea

1992 ◽  
Vol 5 (4) ◽  
pp. 299-305 ◽  
Author(s):  
lonan Marigómez ◽  
Manu Soto ◽  
Eduardo Angulo
Keyword(s):  
Seasonal Variability ◽  
Quantitative Structure

Method application of optimal multi-parameter analysis to assess the distribution of water masses as an example of CTD data of the Barents Sea in summer 2017

2019 ◽  
pp. 38-51
Author(s):  
Valeriy G. Yakubenko ◽  
Anna L. Chultsova
Keyword(s):  
Barents Sea ◽  
Field Measurements ◽  
Structural Similarity ◽  
Water Masses ◽  
Parameter Analysis ◽  
Water Dynamics ◽  
Phosphorus Concentration ◽  
Nitrogen And Phosphorus ◽  
The Barents Sea ◽  
Expert Assessments

Identification of water masses in areas with complex water dynamics is a complex task, which is usually solved by the method of expert assessments. In this paper, it is proposed to use a formal procedure based on the application of the method of optimal multiparametric analysis (OMP analysis). The data of field measurements obtained in the 68th cruise of the R/V “Academician Mstislav Keldysh” in the summer of 2017 in the Barents Sea on the distribution of temperature, salinity, oxygen, silicates, nitrogen, and phosphorus concentration are used as a data for research. A comparison of the results with data on the distribution of water masses in literature based on expert assessments (Oziel et al., 2017), allows us to conclude about their close structural similarity. Some differences are related to spatial and temporal shifts of measurements. This indicates the feasibility of using the OMP analysis technique in oceanological studies to obtain quantitative data on the spatial distribution of different water masses.

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