Recorded presentations to be uploaded to University’s Unitube service

Recorded oral presentations and sessions from Lahti Lakes 2021 will be uploaded onto the University of Helsinki’s Unitube video sharing service in the near future. We now ask all oral presenters to inform the organizing committee if they consent to their presentation being uploaded and if so in which of the following categories:

  1. upload for unrestricted viewing
  2. upload for access to symposium participants only

Please respond by 31.8.2021. If we do not receive your response, by default we will not upload your presentation.

Draft program published: please check your time!

Lahti Lakes 2021 will be hosted from the Videomakers studio in Lahti, with presentations both onsite and online. The organizing committee has now put together a draft program for the 3-day event. If you are a presenting participant, please see your scheduled time below and inform us immediately if you have a problem to make your presentation in the stated time slot. All times are given in Eastern European Summer Time EEST (UTC+3). Note that pre-recorded presentations are possible, but we prefer that you present live so that we can have a proper discussion after each talk. Therefore we have programmed the speakers with time zones in mind.

The program includes oral sessions and other pieces hosted from the studio, online chats following the oral sessions, and two fully-online poster sessions (see legend). Important: We invite all oral presenters from Finland to make their presentations directly from the studio in Lahti. Please inform us if you are not able to do this.

We will contact all participants about payment of the symposium fee during the coming weeks. The fee is €100 for regular participants. Student participants attend for free.

First info for presenters

We are delighted to announce that we received 55 abstracts for the symposium! All the submitted abstracts have been accepted by the organizing committee and will be programmed into the 3-day schedule according to thematic content. We will take into account the time zones of participants so that, for example, presenters from North America are scheduled later in the day to allow real-time participation in the symposium.

The symposium features three presentation types:

  1. Plenary oral presentation (45 mins + 15 mins questions)
  2. Regular oral presentation (15 mins + 5 mins questions)
  3. Poster + multimedia presentation (more information below)

Please see below to find the type of presentation you have been allocated and prepare your presentation according to the guidelines given.

Plenary oral presentations (3 total)

Please prepare a 45-minute presentation in powerpoint or similar platform, for live onsite or online presentation

Erik Jeppesen Biomanipulation as a tool to counteract negative climate warming effects in lakes in different climate zones

Bryan Spears Do the benefits of lake restoration outweigh the costs? 

Anne-Mari Ventelä Lake restoration as an integral component of circular economy and sustainable food production

Regular oral presentations (25 total)

Please prepare a 15-minute presentation in powerpoint or similar platform, for live onsite or online presentation

Karel As Assessing the potential of iron byproducts from water purification in the prevention of phosphorus-release from lake sediments

Marc Beutel Preliminary assessment of hypolimnetic oxygenation to improve water quality in Hodges Reservoir, California, USA

Raoul-Marie Couture Fate of phosphorus in a lanthanum-remediated lake: insights from inverse diagenetic modelling

Brian Huser Aluminium treatment for internal load phosphorus reduction and lake restoration: what works, what doesn’t, and why

Laura Härkönen Biomanipulation of lakes: implications for waterfowl

Juha Keto Restoration and management of Lake Vesijärvi in six decades: A joint long-term venture of limnological research and stakeholder activity

Katarzyna Kowalczewska-Madura Sustainable restoration of an urban lake – changes in water quality and bottom sediments during 12 years of treatments

Jaakko Litmanen Biotracers and metatranscriptomics in modelling seston composition and nutrition

Miquel Lurling Effective restoration of Lake Groote Melanen: from diagnosis to multiple measures

Mark McCarthy A future tale of two winters? Sediment-water interface nitrogen dynamics in Lake Võrtsjärv (Estonia) during the ice-free winter 2019/2020

Maíra Mucci Managing eutrophication through chemical inactivation of phosphate- an overview of materials available

Melanie Münch Sedimentary pools and dynamics of P and Fe in a eutrophic peat lake after Fe-amendment

Silvia Newell Hidden Nitrogen: the key to modeling cyanoHAB toxin concentrations

Peeter Nõges The impact of eutrophication and climate change on accumulated sediment properties: Results from a long-term lake mesocosm experiment

Gertrud Nurnberg Prevention of cyanobacteria proliferation in two connected drinking water reservoirs

Hans Paerl Where do we go from here? Mitigating harmful cyanobacterial blooms in a world facing human nutrient over-Enrichment and climate change

Rebeca Pérez Remote sensing as useful tool to establish the presence and density of cyanobacterial blooms and their temporal and spatial distribution at continental water bodies

Jukka Ruuhijärvi Possibilities to control the abundance of planktivorous smelt by management of piscivore populations

Ilkka Sammalkorpi The potential of long term fish Removal in eutrophic lakes

Costanza Scopetani Microplastics pollution in Vesijärvi lake and PikkuVesijärvi pond

Soila Silvonen The potential of hypolimnetic withdrawal and treatment in the restoration of eutrophic lakes

Martin Søndergaard Lake Ormstrup, Denmark: biomanipulation, sediment removal and phosphorus recycling

Lea Tuvikene Cross-border cooperation on environmental monitoring of Lake Peipsi: main results and perspectives

Kari-Matti Vuori Citizen science in lake restoration: experiences on wood addition activities in the Lake Saimaa

Kristiina Vuorio Spread of non-indigenous moss animal Pectinatella magnifica in Finland – impacts and management

Poster + multimedia presentations (27 total)

Please prepare a 3-slide landscape-format presentation in powerpoint or similar platform, to be saved as a pdf ‘poster’ and uploaded to the symposium online platform for interactive discussion. IMPORTANT: poster materials should be ready for upload by 17.5.2021. Additional information concerning poster presentations can be found in the email to presenters

Oskar Agstam-Norlin A 25-year retrospective analysis of factors influencing success of aluminum treatment for lake restoration

Barbara Alvado Arranz Remote sensing tools to estimate organic and inorganic suspended solids in different types of inland waters

Victoria Barcala Insights on the phosphorus fluxes in a drained agricultural catchment

Natalia Bolotova Ecosystem services as a management tool for Lake Ladoga

Agnieszka Budzyńska Submerged macrophytes mitigate the stimulating effect of hot summer on cyanobacterial blooms in a shallow reservoir under restoration

Ingrid Chorus Decades needed for ecosystem components to respond to a sharp and drastic phosphorus load reduction

Joseph Davidson Effects of aluminum sulfate treatment on nutrient dynamics and a Planktothrix bloom in a shallow, semi-enclosed lake area

Renata Dondajewska-Pielka Effectiveness of innovative nitrate treatment in a small Uzarzewskie Lake (Western Poland)

Guillermo Goyenola First, we had to accept that we could not control the external load. And then what? A synthesis of an ongoing multilake rehabilitation project in southern Uruguay.

Katrit Karus Larval and juvenile perch feeding in some Estonian and Latvian study lakes

Eleni Keliri Case study of Athalassa Lake, Cyprus: Fish kills, cyanobacterial blooming, and treatment with hydrogen peroxide

Mina Kiani Lake restoration by excavating sediment and recycling of sediment phosphorus to close P cycle

Beata Messyasz Plankton reaction to long-term restoration treatments in the dimictic Lake Durowskie (Poland)

Rajashree Naik Socio-economic assessment of India’s largest saline wetlandscape integrated with Google Earth Engine Platform

Tiina Nõges Nitrogen and its trends in Estonian lakes and rivers – expected impacts and knowledge gaps

Freya Olsson Use of water residence time manipulation to control internal phosphorus loading

Henna Raitanen Consistency of different approaches in evaluating nitrogen and phosphorus limitation – Case Lake Vanajavesi (withdrawn)

Joanna Rosińska Why, despite over 60 years of experience, the restoration of lakes still does not bring the expected results? – Polish case study

Kalevi Salonen Changes in phytoplankton of Lake Vesijärvi during the recovery from eutrophication

Jouko Sarvala Successful restoration of Lake Littoistenjärvi with chemical precipitation of phosphorus: the first four years after treatment with polyaluminium chloride

Olga Tammeorg Some important factors to consider in lake restoration

Jussi Vesterinen From headwater lakes towards downstream – a multi-approach restoration project of Siuntionjoki river system

Taisiya Vorobieva Complex studies of lakes in Kenozersky national park, Russia

Kari-Matti Vuori Added wood in water protection structures benefits multiple ecosystem services: experiences from sedimentation basins of peatland forestry

Zhihao Xu Modelling the environmental response to enhanced legacy phosphorus retention in a eutrophic bay

Shujun Yao Integrated water environment management in Taihu Basin

Siqi Zhao Recent sedimentary phosphorus dynamics in a small groundwater-fed lake influenced by catchment erosion: A case study of Vähä-Tiilijärvi, Southern Finland

Videomakers studio gets ready to host Lahti Lakes

Tom and Heikki from the organizing committee visited Videomakers studio this week to check out the options for our live-streamed symposium. Videomakers is a Lahti-based company with decades of experience of live televized events. Lahti Lakes will be hosted at the studio and broadcast via a stream to our online platform hosted by Liveto. We will invite presenters from Finland to join us at the studio, while presenters from overseas will participate via the platform with (hopefully) seamless interaction. We are very excited to be moving forward towards a great symposium!

Instructions for presenters (2018)

Oral presentations

Oral presentations will take place in the Kuusi room of the Sibelius Hall.

The standard oral presentation time slot is 20 mins, including time for questions. We ask that presenters respect the time limits.

Please prepare your presentation in Powerpoint or pdf format. If you wish to use other formats please inform us in advance.

Please load your presentation to the computer in the Kuusi room, either before the morning program (morning presentations) or at lunch time (afternoon presentations).

Poster presentations

The poster session will take place on Monday afternoon in the Haapa room at the Sibelius Hall. Authors should be in attendance throughout the session.

The poster boards are 970 mm (horizontal) x 1170 mm (vertical). Please prepare your poster to fit these dimensions. Use color, make the poster information clear and attractive.

Please attach your poster to the board on Monday, before the morning program. Pins, tape etc. will be provided.

Hotel deals (2018)

We are pleased to announce the following reduced rates at hotels in Lahti on the dates of the symposium. Please use the booking codes given in the information below when reserving your room. For locations of the hotels, please see Locations in Lahti.


Sokos Hotel Lahden Seurahuone

Address: Aleksanterinkatu 14, FI-15110, Lahti


Reduced price (incl. taxes):

  • Standard single room 100 €/day
  • Standard double room 125 €/day

Booking code: LAHTILAKES2018


– By phone: +358 20 1234655

– By e-mail:

Discount available: as long as there are vacant rooms

Schedule: Arrival after 15:00, departure by 12:00


Cumulus City Lahti

Address: Kauppakatu 10, FI-15140 Lahti


Reduced price (incl. taxes):

  • Price of the day -10 % discount

Booking code: LahtiLakes2018


– By phone: +358 20 055 055

– By e-mail:

– Via this link: LahtiLakes2018 (to modify dates, press “search again”)

Discount available: as long as there are vacant rooms

Schedule: Check-in earliest 14:00, check-out latest 12:00


Hotel Grand Lahti

Address: Hämeenkatu 4, FI-15110 Lahti


Reduced price (incl. taxes):

  • Standard single room 75 €/room/day
  • Other rooms (double, triple, family) according to availability

Booking code: LahtiLakes2018


– By phone: +358 3 54 400

– By e-mail:

– Via website:

Discount available: single rooms (quota) available with booking reference until 18th May 2017

Schedule: Check-in earliest 14:00, check-out latest 12:00


Scandic Lahti

Address: Vesijärvenkatu 1, FI-15100 Lahti


Reduced price (incl. taxes):

  • Standard single room 95 €/day
  • Standard double room 113 €/day

Booking code: LahtiLakes2018


– phone: +358 3 339 39 11

– e-mail:

Discount available: rooms (quota) available with booking reference until 25th May 2018

Schedule: Check-in earliest 14:00, check-out latest 12:00


Hotel Forenom

Address: Rauhankatu 14, 15110 Lahti


Phone: +358 20 198 3420

Reduced price (incl. taxes):

  • Price of the day -10 % discount

Booking code: LAHTILAKES


– Via website:

Discount available: as long as there are vacant rooms

Schedule: Check-in earliest 14:00, check-out latest 12:00


Hotel Tallukka

Address: Tallukantie 1, 17200 Vääksy
Phone: +358 3 88881
Reduced price (incl. taxes):
  • Standard single room 75 €/day
  • Standard double room 86 €/day
  • Superior double room 108 €/day
  • 3 person room 119 €/day
  • 4 person room 139 €/day


– Via website or phone (please state that your are a participant in the Lahti Lakes meeting)