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  1. Article

    Open Access

    Internal phosphorus loading due to sediment anoxia in shallow areas: implications for lake aeration treatments

    Shallow lake sediments may be anoxic despite overlying aerated water. In the current study, we aimed to ascertain the contribution of shallow areas to internal phosphorus (P) loading due to sediment anoxia in ...

    Olga Tammeorg, Gertrud Nürnberg, Juha Niemistö, Marina Haldna… in Aquatic Sciences (2020)

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  2. No Access

    Article

    Factors behind the variability of phosphorus accumulation in Finnish lakes

    Phosphorus retention (TPacc) is one of the major water quality regulators in lakes. The current study aimed at ascertaining the specific lake characteristics regulating TPacc. Moreover, we were interested whether...

    Olga Tammeorg, Marina Haldna, Peeter Nõges, Peter Appleby… in Journal of Soils and Sediments (2018)

  3. No Access

    Article

    Importance of diffusion and resuspension for phosphorus cycling during the growing season in large, shallow Lake Peipsi

    Our study aimed at elucidating the role of internal loading in the budget of phosphorus (P) and assessed the importance of resuspension and diffusive fluxes for P cycling in large, shallow Lake Peipsi. The int...

    Olga Tammeorg, Jukka Horppila, Reet Laugaste, Marina Haldna, Juha Niemistö in Hydrobiologia (2015)

  4. No Access

    Article

    Diet patterns and ontogenetic diet shift of pikeperch, Sander lucioperca (L.) fry in lakes Peipsi and Võrtsjärv (Estonia)

    Pikeperch is a major predator in the pelagic zone of eutrophic waters, such as the large north-temperate lowland lakes Võrtsjärv (Estonia) and Peipsi (Estonia/Russia). The size and structure of the pikeperch p...

    Kai Ginter, Külli Kangur, Andu Kangur, Peeter Kangur, Marina Haldna in Hydrobiologia (2011)

  5. No Access

    Article

    Habitat preferences as related to the prolonged dormancy of perennial herbs and ferns

    Prolonged dormancy (hereafter dormancy), a phenomenon in which a perennial herbaceous plant does not sprout for one or more years, is examined. The phenomenon may be more frequent than stated so far and discov...

    Margit Reintal, Kadri Tali, Marina Haldna, Tiiu Kull in Plant Ecology (2010)

  6. No Access

    Article

    Effect of winter conditions on spring nutrient concentrations and plankton in a large shallow Lake Peipsi (Estonia/Russia)

    During the study period 1997–2007, the duration of the ice cover of Lake Peipsi, the largest freshwater lake in Estonia, was variable. The ice-break took place in mid-April instead of generally in May. Compare...

    Kätlin Blank, Juta Haberman, Marina Haldna, Reet Laugaste in Aquatic Ecology (2009)

  7. No Access

    Article

    Diversity and structure of the winter rotifer assemblage in a shallow eutrophic northern temperate Lake Võrtsjärv

    In the eutrophic Lake Võrtsjärv (Central Estonia, area 270 km2, mean depth 2.8 m) rotifers form ca. 90% of total abundance and 80% of biomass in winter zooplankton community. The winter rotifer assemblage was dom...

    Taavi Virro, Juta Haberman, Marina Haldna, Kätlin Blank in Aquatic Ecology (2009)

  8. No Access

    Article

    Nutrients and phytoplankton in Lake Peipsi during two periods that differed in water level and temperature

    Data for the vegetation periods (May–November) of 1985–2003 were used to collate the nutrient content and biomass of the most important phytoplankton groups in Lake Peipsi (Estonia). Two periods differing in e...

    Marina Haldna, Anu Milius, Reet Laugaste, Külli Kangur in Hydrobiologia (2008)

  9. No Access

    Chapter

    Nutrients and phytoplankton in Lake Peipsi during two periods that differed in water level and temperature

    Data for the vegetation periods (May–November) of 1985–2003 were used to collate the nutrient content and biomass of the most important phytoplankton groups in Lake Peipsi (Estonia). Two periods differing in e...

    Marina Haldna, Anu Milius, Reet Laugaste… in European Large Lakes Ecosystem changes and… (2008)