The organizing committee would like to thank all participants once more for your contributions to a successful symposium. We hope you have returned home safely! Please note that the recordings of all 3 days are visible via the online platform until 5. July 2024. The feedback form on the platform also closes on the same date, please add your comments to help us improve the symposium for the 2027 edition. Please also contact us if you do not wish for the recording of your presentation to be archived for open access viewing.

Participants of Lahti Lakes 2024 on the shore of Lake Vesijärvi

We hope you have safely arrived in Lahti in time for the symposium. A couple of last-minute updates for everyone:

Google maps library of key locations

We have made a shared library of key locations in Google Maps. Please access it here.

Lahti Lakes 2024 opening address from Jenni Jäänheimo

The opening address of the symposium on Monday will be given be Jenni Jäänheimo, senior specialist in water resources and marine protection at the Finnish Ministry of the Environment. Jenni has co-ordinated the Finnish government’s €69 million Water Protection Program 2019-2023. We are delighted to welcome her to Lahti to open the symposium.

Get together at Santa Fe bar and terrace from 19.00 Sunday

We are meeting for an informal social on Sunday evening at Santa Fe bar and terrace in the center of Lahti from 19.00 on Sunday. The location can be found in the Google maps library shared above. Hope to see you there!

Hi everyone,

The Lahti Lakes 2024 organizing team has been busy getting ready for our symposium next week. Here are some updates on what has been going on and what to looking forward to during the 3-day event.

Welcome to the Sibelius Hall

The symposium takes place in Lahti’s famous Sibelius Hall. The building was formerly a lumber mill on the shoreline of Lake Vesijärvi. Since a major renovation in 2000 it now hosts many national and international events including concerts and symposia. Read more here. We are booked into the Puusepän sali (Capenter’s hall) which is being specially arranged for the hybrid format of Lahti Lakes. Pics below courtesy of our partners Eventum. We have approximately 100 attendees of whom over 80 will be present in Lahti, with the rest joining us via the online platform.

Abstract book published

The abstract book for Lahti Lakes 2024 was sent to participants on 16 May. You can find the pdf below. Hard copies of the abstract book will be provided to participants on arrival at the Sibelius Hall.

Lahti Lakes 2024 online platform

All participants of the symposium, whether onsite or online, can follow a live stream of the event via the online platform hosted by our partners Liveto. The platform also allows participants to view the poster presentations as pdf files, and to interact with the online participants via social rooms. Furthermore, online poster presenters will have video rooms enabled, allowing participation during the poster session. An accompanying event app will allow interaction between onsite and online participants through chat functions throughout the symposium. The event app will be accessible to onsite participants via a QR-code on your name badge.

PAID PARTICIPANTS WILL RECEIVE INSTRUCTIONS ABOUT LOGGING IN TO THE ONLINE PLATFORM BY FRIDAY 31 MAY!

Note: the live stream of the event will be recorded by our partners Videomakers. During the event, each day’s recording is visible on the online platform until overprinted by the following day. After the event, the recordings of all 3 days are visible on the platform for 1 month. Following this, we would like to make the individual presentations publicly available as short videos on the University of Helsinki video archive, as done for the 2021 symposium. If you do not wish your presentation to be archived in this way, please contact the organizers.

Panel discussion hosted by WWQA Ecosystems workstream

The Monday afternoon program includes a 40-minute panel discussion hosted by the World Water Quality Alliance (WWQA) Ecosystems Workstream. The theme of the discussion will be “Embedding lakes into the global sustainability agenda: where to next?“. The panel will focus on the route towards implementing the goals of the 2023 White Paper published by the workstream, which is accessible here. In particular, we will discuss the creation of a Global Coalition for Lakes and development of the Global Community of Practice in lake restoration. Members of the panel include:

Bryan Spears Centre for Ecology and Hydrology, Edinburgh, UK

Priyanka Jamwal Ashoka Trust for research in Ecology and the Environment, Bengaluru, India

Maíra Mucci Wageningen University & Research, Netherlands

Zhengwen Liu Chinese Academy of Sciences, Nanjing, China

Kenneth Irvine IHE Delft, Netherlands

In advance of the discussion, we will publish a draft of a concept note entitled Proposal for a Global Coalition on Sustainable Lake Management, outlining recent developments and a proposed roadmap for future actions in this area.

Social program

Summer in Lahti is beautiful and we intend to make the most of the long days with evening social events!

Sunday: Informal get-together in Lahti (from 19.00).

We will meet on the terrace of Santa Fe bar and restaurant in the central square of Lahti. No official program, just fun to catch up with everyone again. All welcome!

Monday: Reception at Pro Puu gallery (from 19.00)

Immediately after the poster session we will cross the road from Sibelius Hall to the Pro Puu gallery. The gallery is hosting a collection of artwork and photography inspired by Lake Vesijärvi at the time of our symposium. We will have drinks and snacks and hear an official welcome address from a representative of City of Lahti.

Tuesday: Fieldtrip to Lake Vesijärvi and Salpausselkä Geopark (from 14.00)

At around 13.45 we will walk together from Sibelius Hall to the Lahti Harbour, where we board a cruise boat for our fieldtrip. We will have a tour of beautiful Lake Vesijärvi, known as the “living room” of Lahti and the focus of lake restoration efforts for several decades. During the tour, we will have drinks and snacks and hear from Kati Komulainen of the Salpausselkä UNESCO Geopark. Lake Vesijärvi forms part of this newly-recognized park (see map below) which represents a unique set of Quaternary geological sights in the Lahti area, including the famed Salpausselkä ice marginal formations that bound Vesijärvi to the north and south.

Tuesday: Dinner at Kommodori restaurant (from 19.00)

Folllowing the fieldtrip eveyone is welcome for the symposium dinner at Kommodori restaurant. This lovely spot is located on a small island in Lake Vesijärvi and has great views over the lake and surrounding landscape. During dinner, we will be entertained by local musicians Viljami Viippola and Jenny Muhonen on piano and cello.

Five keynote speakers for the 2024 meeting have been confirmed. We are happy to welcome the following experts to the event:

Laurence Carvalho (Norwegian Institute for Water Research NIVA)

Olga Tammeorg (University of Helsinki, Finland)

Zhengwen Liu (Chinese Academy of Sciences, Beijing, China)

Michael Hupfer (Leibniz institute of Freshwater Ecology and Inland Fisheries, Germany)

Kasper Reitzel (University of Southern Denmark)

Further information on additional invited speakers will be updated here!

There are numerous options for hotels in Lahti during the symposium. Please check visitlahti.fi for a complete list. Lahti Lakes 2024 has partnership deals for reduced prices at the Lahden Seurahuone and Greenstar hotels as follows:

Solo Sokos Hotel Lahden Seurahuone

Reservation Code: BLAHTILAKES2024 (note: “B” is required, i.e. not a typo)

128 EUR / Standard single room / night

147 EUR / Loft Standard single room / night

162 EUR / Loft Supreme single room / night

153 EUR / Standard twin room / night

172 EUR Loft Standard twin room / night

187 EUR Loft Supreme twin room / night

Rates include breakfast during normal opening hours, wireless internet access (Wi-Fi), VAT and guest sauna (when available). We reserve the right to change rates if VAT changes.

Rates include S-Card benefits.

Guests are entitled to the rooms from 3:00 PM on the day of arrival to 12:00 (noon) on day the of departure.

All reservations from the allotment need to be guaranteed with a credit card or paid upon booking. The last free cancellation date for each individual reservation is 7 days prior to the arrival. We recommend making a reservation by phone or online. Kindly note that due to security reasons credit card details should not be sent via email.

Reservations on website https://www.sokoshotels.fi/en

(Choose the city Lahti and dates, code is entered in ”Promotion code or company code”)

Sokoshotels sales +358300 870 000 or Solo Sokos Hotel Lahden Seurahuone, puh. 020 1234 655, email. seurahuone.lahti@sokoshotels.fi

Note: 70 rooms are reserved at the above rates until 5 May 2024. After this date, unreserved rooms will be released to open booking in stages. The last possible date to book with above rates, assuming availability of the chosen room, is 26 May 2024.

Greenstar hotel

Reservation code: LahtiLakes

95 EUR / Standard single room / night

107 EUR / Standard twin room / night

Rates include breakfast, usual services and VAT charges. We reserve the right to change rates if VAT changes.

Rates are valid for bookings made until 1 May 2024.

Reservations on website: https://www.greenstar.fi/en/hotels/lahti/, via email to lahti@greenstar.fi or telephone +358 10 423 9392

The recorded presentations from authors giving consent have been uploaded to the University of Helsinki’s Unitube service here. Additional presentations are made available to participants of the symposium via a link sent by email.

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.

We are very happy to announce the publication of the abstract book for this year’s symposium!

Pre-registered participants should now visit the homepage of the meeting platform to pay the registration fee of €100 (+€3 service charge) and gain access to the platform. Undergraduate students may register for free.

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.

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