A5012178262- Marine and coastal ecosystems
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine Biology and Ecology Research
- Microbial Community Ecology and Physiology
- Land Use and Management
- Food Industry and Aquatic Biology
- Marine and environmental studies
- Isotope Analysis in Ecology
Latvian Institute of Aquatic Ecology
2016-2024
Daugavpils University
2022-2024
Latvijas Organiskās Sintēzes Institūts
2024
University of Latvia
2016
The seasonal patterns of primary production, phytoplankton biomass, chlorophyll a, and nutrients were investigated in the central part Gulf Riga (Baltic Sea) during 2011 2012. Annual productivity gulf was range 353.4–376.2 gC m−2. Maximum carbon fixation rates occurred spring bloom from April to May when winter nutrient pool rapidly exhausted, suggesting use regenerated already spring. new production calculated on draw-down nitrates amounted 51.80% net community production. summer...
Abstract In eutrophied marine systems such as the Baltic Sea, diazotrophic cyanobacteria have potential to add additional bioavailable nitrogen (N) system through fixation of atmospheric dinitrogen (N 2 ). However, their growth is regarded be limited by phosphorus availability (P). This study investigates response two species, Aphanizomenon flosaquae and Nodularia spumigena , collected from Gulf Riga under different environmental conditions a short-period dissolved inorganic (DIP)...
Abstract The ratio of stable carbon and nitrogen isotopes in the suspended particulate matter has been widely used to study processes occurring marine ecosystem. At same time, signals provided by isotope ratios coastal ecosystems can be difficult interpret, due several, often contradictory taking place simultaneously. In this study, we hypothesized that isotopic variation is predominantly affected seasonally phytoplankton species succession Gulf Riga, Baltic Sea. Cyclical seasonal patterns...
Abstract In eutrophied marine systems such as the Baltic Sea, diazotrophic cyanobacteria has a capacity to further enhance eutrophication or negate mitigation measures by converting atmospheric nitrogen into bioavailable forms through N 2 -fixation. This study investigates response of two species, Aphanizomenon flosaquae and Nodularia spumigena , collected from Gulf Riga under different environmental conditions short-period phosphorus enrichment. The samples were during summer cyanobacterial...
Spring phytoplankton production was estimated by a light and dark bottle oxygen technique in the southern part of Gulf Riga during spring 2014.The main study objective to determine factors that define primary productivity analyzing pattern changes succession species along with environmental factors.The measured after an untypically mild winter without ice-cover on flooding, which resulted large amounts terrestrial nutrients retained catchment area.At time precipitation played major role...
Abstract The semi-enclosed Baltic Sea experiences regular summer blooms of diazotrophic cyanobacteria. Previously, it has been conclusively demonstrated that in open nitrogen-limited parts the Sea, cyanobacteria successfully fix atmospheric N2. At same time, activity is still poorly understood sub-regions where nitrogen and phosphorus are co-limiting primary production. To address this gap research, we used the15 N tracer method for situ incubations measured N2-fixation rate...
Temporal variations in the primary production of size-fractionated autotrophic plankton community were studied coastal-estuarine waters eutrophic Gulf Riga, Baltic Sea. The was net-autotrophic during spring and summer net-heterotrophic autumn. results present study clearly demonstrate strong covariation between net (NPP) <56 µm fractionated biomass, particularly small-sized (16–33 µm) Mesodinium rubrum, implying that majority NPP stems from lower end size spectrum. A pronounced distribution...