Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive
The tackling of coastal eutrophication requires water protection measures based on status assessments of water quality. The main purpose of this thesis was to evaluate whether it is possible both scientifically and within the terms of the European Union Water Framework Directive (WFD) to assess the...
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Helsingin yliopisto
2010
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/21915 2023-08-20T04:05:40+02:00 Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive Kasviplanktonin määrä rehevyyden indikaattorina Suomen rannikkovesissä : sovellutukset vesipuitedirektiiviin Kauppila, Pirkko Leppänen, Juha-Markku University of Helsinki, Faculty of Biosciences, Department of Ecological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, ympäristöekologian laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för miljöekologi Pitkänen, Heikki Lepistö, Liisa 2010-11-25T13:13:33Z application/pdf http://hdl.handle.net/10138/21915 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-11-2898-1 Vammala: Vammalan kirjapaino, 2007, Monograph of the Boreal Environment Research . 1239-1875 Monograph of the Boreal Environment Research URN:ISSN:1796-1661 http://hdl.handle.net/10138/21915 URN:ISBN:978-952-11-2899-8 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. hydrobiologia Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:18:27Z The tackling of coastal eutrophication requires water protection measures based on status assessments of water quality. The main purpose of this thesis was to evaluate whether it is possible both scientifically and within the terms of the European Union Water Framework Directive (WFD) to assess the status of coastal marine waters reliably by using phytoplankton biomass (ww) and chlorophyll a (Chl) as indicators of eutrophication in Finnish coastal waters. Empirical approaches were used to study whether the criteria, established for determining an indicator, are fulfilled. The first criterion (i) was that an indicator should respond to anthropogenic stresses in a predictable manner and has low variability in its response. Summertime Chl could be predicted accurately by nutrient concentrations, but not from the external annual loads alone, because of the rapid affect of primary production and sedimentation close to the loading sources in summer. The most accurate predictions were achieved in the Archipelago Sea, where total phosphorus (TP) and total nitrogen (TN) alone accounted for 87% and 78% of the variation in Chl, respectively. In river estuaries, the TP mass-balance regression model predicted Chl most accurately when nutrients originated from point-sources, whereas land-use regression models were most accurate in cases when nutrients originated mainly from diffuse sources. The inclusion of morphometry (e.g. mean depth) into nutrient models improved accuracy of the predictions. The second criterion (ii) was associated with the WFD. It requires that an indicator should have type-specific reference conditions, which are defined as "conditions where the values of the biological quality elements are at high ecological status". In establishing reference conditions, the empirical approach could only be used in the outer coastal water types, where historical observations of Secchi depth of the early 1900s are available. The most accurate prediction was achieved in the Quark. In the inner coastal water types, ... Doctoral or Postdoctoral Thesis Boreal Environment Research Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
hydrobiologia |
spellingShingle |
hydrobiologia Kauppila, Pirkko Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
topic_facet |
hydrobiologia |
description |
The tackling of coastal eutrophication requires water protection measures based on status assessments of water quality. The main purpose of this thesis was to evaluate whether it is possible both scientifically and within the terms of the European Union Water Framework Directive (WFD) to assess the status of coastal marine waters reliably by using phytoplankton biomass (ww) and chlorophyll a (Chl) as indicators of eutrophication in Finnish coastal waters. Empirical approaches were used to study whether the criteria, established for determining an indicator, are fulfilled. The first criterion (i) was that an indicator should respond to anthropogenic stresses in a predictable manner and has low variability in its response. Summertime Chl could be predicted accurately by nutrient concentrations, but not from the external annual loads alone, because of the rapid affect of primary production and sedimentation close to the loading sources in summer. The most accurate predictions were achieved in the Archipelago Sea, where total phosphorus (TP) and total nitrogen (TN) alone accounted for 87% and 78% of the variation in Chl, respectively. In river estuaries, the TP mass-balance regression model predicted Chl most accurately when nutrients originated from point-sources, whereas land-use regression models were most accurate in cases when nutrients originated mainly from diffuse sources. The inclusion of morphometry (e.g. mean depth) into nutrient models improved accuracy of the predictions. The second criterion (ii) was associated with the WFD. It requires that an indicator should have type-specific reference conditions, which are defined as "conditions where the values of the biological quality elements are at high ecological status". In establishing reference conditions, the empirical approach could only be used in the outer coastal water types, where historical observations of Secchi depth of the early 1900s are available. The most accurate prediction was achieved in the Quark. In the inner coastal water types, ... |
author2 |
Leppänen, Juha-Markku University of Helsinki, Faculty of Biosciences, Department of Ecological and Environmental Sciences Helsingin yliopisto, biotieteellinen tiedekunta, ympäristöekologian laitos Helsingfors universitet, biovetenskapliga fakulteten, institutionen för miljöekologi Pitkänen, Heikki Lepistö, Liisa |
format |
Doctoral or Postdoctoral Thesis |
author |
Kauppila, Pirkko |
author_facet |
Kauppila, Pirkko |
author_sort |
Kauppila, Pirkko |
title |
Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
title_short |
Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
title_full |
Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
title_fullStr |
Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
title_full_unstemmed |
Phytoplankton quantity as an indicator of eutrophication in Finnish coastal waters : Applications within the Water Framework Directive |
title_sort |
phytoplankton quantity as an indicator of eutrophication in finnish coastal waters : applications within the water framework directive |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/21915 |
genre |
Boreal Environment Research |
genre_facet |
Boreal Environment Research |
op_relation |
URN:ISBN:978-952-11-2898-1 Vammala: Vammalan kirjapaino, 2007, Monograph of the Boreal Environment Research . 1239-1875 Monograph of the Boreal Environment Research URN:ISSN:1796-1661 http://hdl.handle.net/10138/21915 URN:ISBN:978-952-11-2899-8 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774716314662731776 |