Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management
Lake Sakylan Pyhajarvi has been an important fishing site and drinking water source for the local population for centuries. The lake has undergone significant changes: (1) the water level was lowered in the 1600s and in the 1850s; (2) planktivorous coregonid fish were successfully introduced in the...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/212608 2024-01-07T09:41:52+01:00 Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management Ventelä, Anne-Mari Amsinck, Susanne Lildal Kauppila, Tommi Johansson, Liselotte Sander Jeppesen, Erik Kirkkala, Teija Sondergaard, Martin Weckstrom, Jan Sarvala, Jouko Environmental Sciences Environmental Change Research Unit (ECRU) 2017-08-17T12:43:00Z 22 application/pdf http://hdl.handle.net/10138/212608 eng eng Springer 10.1007/s10750-015-2552-2 Ventelä , A-M , Amsinck , S L , Kauppila , T , Johansson , L S , Jeppesen , E , Kirkkala , T , Sondergaard , M , Weckstrom , J & Sarvala , J 2016 , ' Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management ' , Hydrobiologia , vol. 778 , no. 1 , pp. 273-294 . https://doi.org/10.1007/s10750-015-2552-2 ORCID: /0000-0001-5604-617X/work/30330987 84945296112 08f78617-16af-4de4-89b9-4ae5cfd73cac http://hdl.handle.net/10138/212608 000379645500020 cc_by openAccess info:eu-repo/semantics/openAccess Eutrophication Palaeolimnology Diatoms Cladoceran subfossils Monitoring Lake recovery Restoration targets Climate change adaptation PLANKTIVOROUS FISH ABUNDANCE CLIMATE-CHANGE SOUTHWEST FINLAND COMMUNITY STRUCTURE ARCTIC LAKES WATER-LEVEL BOREAL LAKE PALEOLIMNOLOGY ZOOPLANKTON 1172 Environmental sciences Article publishedVersion 2017 ftunivhelsihelda 2023-12-14T00:13:56Z Lake Sakylan Pyhajarvi has been an important fishing site and drinking water source for the local population for centuries. The lake has undergone significant changes: (1) the water level was lowered in the 1600s and in the 1850s; (2) planktivorous coregonid fish were successfully introduced in the early 1900s; (3) nutrient input from intensified agriculture has increased since the 1950s and (4) the effects of the current variable climate on the lake and its catchment have become more evident since the 1990s. We determined the phases of oligotrophication, eutrophication and recovery and elucidated the ecosystem changes by combining palaeolimnological records with detailed neolimnological data. The sedimentary diatom and cladoceran assemblages first showed a relatively eutrophic period followed by oligotrophic periods, linked with the artificial changes in water level and consequent shifts in macrophyte abundance. The oligotrophic period in the early 1900s is thought to represent the target trophic state for the lake. After the 1950s, introduction of vendace resulted in higher planktivory reflected by an increased relative abundance of small-bodied pelagic cladocerans. Signs of eutrophication occurred due to increased nutrient load. During the last 10 years, signs of recovery have been recorded. A complex history such as that of Lake Pyhajarvi illustrates the difficulties in selecting management targets, and the risk of setting false targets, for lakes based solely on monitoring data-both neolimnological and palaeolimnological approach are needed. Peer reviewed Article in Journal/Newspaper Arctic Climate change Zooplankton HELDA – University of Helsinki Open Repository Arctic Boreal Lake ENVELOPE(-127.670,-127.670,58.802,58.802) Hydrobiologia 778 1 273 294 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Eutrophication Palaeolimnology Diatoms Cladoceran subfossils Monitoring Lake recovery Restoration targets Climate change adaptation PLANKTIVOROUS FISH ABUNDANCE CLIMATE-CHANGE SOUTHWEST FINLAND COMMUNITY STRUCTURE ARCTIC LAKES WATER-LEVEL BOREAL LAKE PALEOLIMNOLOGY ZOOPLANKTON 1172 Environmental sciences |
spellingShingle |
Eutrophication Palaeolimnology Diatoms Cladoceran subfossils Monitoring Lake recovery Restoration targets Climate change adaptation PLANKTIVOROUS FISH ABUNDANCE CLIMATE-CHANGE SOUTHWEST FINLAND COMMUNITY STRUCTURE ARCTIC LAKES WATER-LEVEL BOREAL LAKE PALEOLIMNOLOGY ZOOPLANKTON 1172 Environmental sciences Ventelä, Anne-Mari Amsinck, Susanne Lildal Kauppila, Tommi Johansson, Liselotte Sander Jeppesen, Erik Kirkkala, Teija Sondergaard, Martin Weckstrom, Jan Sarvala, Jouko Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
topic_facet |
Eutrophication Palaeolimnology Diatoms Cladoceran subfossils Monitoring Lake recovery Restoration targets Climate change adaptation PLANKTIVOROUS FISH ABUNDANCE CLIMATE-CHANGE SOUTHWEST FINLAND COMMUNITY STRUCTURE ARCTIC LAKES WATER-LEVEL BOREAL LAKE PALEOLIMNOLOGY ZOOPLANKTON 1172 Environmental sciences |
description |
Lake Sakylan Pyhajarvi has been an important fishing site and drinking water source for the local population for centuries. The lake has undergone significant changes: (1) the water level was lowered in the 1600s and in the 1850s; (2) planktivorous coregonid fish were successfully introduced in the early 1900s; (3) nutrient input from intensified agriculture has increased since the 1950s and (4) the effects of the current variable climate on the lake and its catchment have become more evident since the 1990s. We determined the phases of oligotrophication, eutrophication and recovery and elucidated the ecosystem changes by combining palaeolimnological records with detailed neolimnological data. The sedimentary diatom and cladoceran assemblages first showed a relatively eutrophic period followed by oligotrophic periods, linked with the artificial changes in water level and consequent shifts in macrophyte abundance. The oligotrophic period in the early 1900s is thought to represent the target trophic state for the lake. After the 1950s, introduction of vendace resulted in higher planktivory reflected by an increased relative abundance of small-bodied pelagic cladocerans. Signs of eutrophication occurred due to increased nutrient load. During the last 10 years, signs of recovery have been recorded. A complex history such as that of Lake Pyhajarvi illustrates the difficulties in selecting management targets, and the risk of setting false targets, for lakes based solely on monitoring data-both neolimnological and palaeolimnological approach are needed. Peer reviewed |
author2 |
Environmental Sciences Environmental Change Research Unit (ECRU) |
format |
Article in Journal/Newspaper |
author |
Ventelä, Anne-Mari Amsinck, Susanne Lildal Kauppila, Tommi Johansson, Liselotte Sander Jeppesen, Erik Kirkkala, Teija Sondergaard, Martin Weckstrom, Jan Sarvala, Jouko |
author_facet |
Ventelä, Anne-Mari Amsinck, Susanne Lildal Kauppila, Tommi Johansson, Liselotte Sander Jeppesen, Erik Kirkkala, Teija Sondergaard, Martin Weckstrom, Jan Sarvala, Jouko |
author_sort |
Ventelä, Anne-Mari |
title |
Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
title_short |
Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
title_full |
Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
title_fullStr |
Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
title_full_unstemmed |
Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management |
title_sort |
ecosystem change in the large and shallow lake säkylän pyhäjärvi, finland, during the past ~400 years : implications for management |
publisher |
Springer |
publishDate |
2017 |
url |
http://hdl.handle.net/10138/212608 |
long_lat |
ENVELOPE(-127.670,-127.670,58.802,58.802) |
geographic |
Arctic Boreal Lake |
geographic_facet |
Arctic Boreal Lake |
genre |
Arctic Climate change Zooplankton |
genre_facet |
Arctic Climate change Zooplankton |
op_relation |
10.1007/s10750-015-2552-2 Ventelä , A-M , Amsinck , S L , Kauppila , T , Johansson , L S , Jeppesen , E , Kirkkala , T , Sondergaard , M , Weckstrom , J & Sarvala , J 2016 , ' Ecosystem change in the large and shallow Lake Säkylän Pyhäjärvi, Finland, during the past ~400 years : implications for management ' , Hydrobiologia , vol. 778 , no. 1 , pp. 273-294 . https://doi.org/10.1007/s10750-015-2552-2 ORCID: /0000-0001-5604-617X/work/30330987 84945296112 08f78617-16af-4de4-89b9-4ae5cfd73cac http://hdl.handle.net/10138/212608 000379645500020 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Hydrobiologia |
container_volume |
778 |
container_issue |
1 |
container_start_page |
273 |
op_container_end_page |
294 |
_version_ |
1787422667158061056 |