René Freiberg
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View article: Cladoceran Chydorus sphaericus and Colonial Cyanobacteria: Potentially a Toxic Relationship?
Cladoceran Chydorus sphaericus and Colonial Cyanobacteria: Potentially a Toxic Relationship? Open
Chydorus sphaericus is often a dominant cladoceran zooplankton species in water bodies experiencing harmful cyanobacterial blooms. However, its relationship with toxin-producing algae remains largely unexplored. In this study, the feeding …
View article: Ecosystem changes in large and shallow Võrtsjärv, a lake in Estonia : evidence from sediment pigments and phosphorus fractions
Ecosystem changes in large and shallow Võrtsjärv, a lake in Estonia : evidence from sediment pigments and phosphorus fractions Open
Palaeopigments, organic matter dissolved in sediment porewater (pDOM) and phosphorus fractions were analysed in a sediment core from large shallow Vortsjarv with the aim to assess whether the trends of climate-driven and anthropogenic chan…
Responses of metabolic pathways to polycyclic aromatic compounds in flounder after oil spill in north-west of Estonia Open
No abstracts are to be cited without prior reference to the author.In January 2006 oil spill of approximately 40 tons of heavy fuel oil of unknown origin affected more than 30 km of northwestern Estonian coast. Aquatic pollution of coastal…
View article: Consistency of six in situ, in vitro and satellite-based methods to derive chlorophyll a in two optically different lakes
Consistency of six in situ, in vitro and satellite-based methods to derive chlorophyll a in two optically different lakes Open
Phytoplankton and its most common pigment chlorophyll a (Chl-a) are important parameters in characterizing lake ecosystems. We compared six methods to measure the concentration of Chl a (C Chl-a ) in two optically different lakes: stratifi…
Use of sedimentary algal pigment analyses to infer past lake-water total phosphorus concentrations Open
We tested the feasibility of using sedimentary algal pigment analyses by spectral deconvolution to infer past lake-water total phosphorus concentrations. We established equations that link lake-water nutrient concentrations and sediment pi…
View article: Factors influencing the pigment composition and dynamics of photoautotrophic picoplankton in shallow eutrophic lakes
Factors influencing the pigment composition and dynamics of photoautotrophic picoplankton in shallow eutrophic lakes Open
Photoautotrophic picoplankton (0.2–2 μm) can be a major contributor to primary production and play a significant part in the ecosystem carbon flow. However, the understanding about the dynamics of both eukaryotic and prokaryotic components…
View article: Both climate trends and short‐term fluctuations affected algae–zooplankton interactions in a boreal lake during the late Holocene
Both climate trends and short‐term fluctuations affected algae–zooplankton interactions in a boreal lake during the late Holocene Open
Most studies aiming to explore the response of algae and zooplankton trophic interactions to climate variability have only been focused on unidirectional and very short‐term trends in temperature changes. As a result, the non‐stationary as…
View article: Environmental drivers and abrupt changes of phytoplankton community in temperate lake Lielais Svētiņu, Eastern Latvia, over the last Post-Glacial period from 14.5 kyr
Environmental drivers and abrupt changes of phytoplankton community in temperate lake Lielais Svētiņu, Eastern Latvia, over the last Post-Glacial period from 14.5 kyr Open
Understanding the long-term dynamics of ecological communities on the centuries-to-millennia scale is important for explaining the emergence of present-day biodiversity patterns and for predicting possible future scenarios. Fossil pigments…
View article: Drivers of change and ecosystem status in a temperate lake over the last Post-Glacial period from 14.5 kyr
Drivers of change and ecosystem status in a temperate lake over the last Post-Glacial period from 14.5 kyr Open
Understanding the long-term dynamics of ecological communities on the centuries-to-millennia scale is important for explaining present-day biodiversity patterns. Placing these patterns in a historical context could yield reliable tools for…
View article: Seasonal data on phytoplankton, zooplankton and zooplankton feeding from Lake Peipsi (Estonia)
Seasonal data on phytoplankton, zooplankton and zooplankton feeding from Lake Peipsi (Estonia) Open
Data related to the article Role of potentially toxic cyanobacteria in crustacean zooplankton diet in a eutrophic lake.
Algal Diet of Small-Bodied Crustacean Zooplankton in a Cyanobacteria-Dominated Eutrophic Lake Open
Small-bodied cladocerans and cyclopoid copepods are becoming increasingly dominant over large crustacean zooplankton in eutrophic waters where they often coexist with cyanobacterial blooms. However, relatively little is known about their a…