Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality

Makeanveden helmen simpukka Margaritifera margaritifera on uhanalainen laji. Makean veden simpukat (Unionoida) voivat tarjota arvokkaita ekosysteemipalveluja ja parantaa veden laatua suodatustoimintansa ansiosta. Mitään tutkimusta ei kuitenkaan ole tehty siitä, miten uhanalainen Margaritifera marga...

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Päätekijä: Begum, Khaleda
Muut tekijät: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, Jyväskylän yliopisto, University of Jyväskylä
Aineistotyyppi: Pro gradu
Kieli:eng
Julkaistu: 2018
Aiheet:
Linkit: https://jyx.jyu.fi/handle/123456789/62770
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author Begum, Khaleda
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_facet Begum, Khaleda Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä Begum, Khaleda Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science Jyväskylän yliopisto University of Jyväskylä
author_sort Begum, Khaleda
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description Makeanveden helmen simpukka Margaritifera margaritifera on uhanalainen laji. Makean veden simpukat (Unionoida) voivat tarjota arvokkaita ekosysteemipalveluja ja parantaa veden laatua suodatustoimintansa ansiosta. Mitään tutkimusta ei kuitenkaan ole tehty siitä, miten uhanalainen Margaritifera margaritifera—joka on aikaisemmin esiintynyt (ja voi esiintyä vielä nykyäänkin paikoittain) hyvin suurina tiheyksinä—vaikuttaa jokiekosysteemiin ja veden laatuun. Tämän tutkimuksen tarkoituksena oli tutkia jokihelmisimpukoiden vaikutuksia jokiin analysoimalla veden laatuparametreja sekä kasviplanktonin ja zooplanktonin tiheyttä kahdessa pohjois-suomalaisessa, lähekkäin sijaitsevassa joessa, joista toisessa esiintyy tiheä jokihelmisimpukkakanta, mutta toisessa simpukoita ei ole. Tutkimus tehtiin keräämällä vesinäytteitä ja suorittamalla mittauksia paikan päällä 500 metrin matkalla kymmenestä pisteestä 50 metrin välein jokien yläpuolella sijaitsevasta järvestä alkaen. Tutkitut muuttujat olivat veden lämpötila, sähkönjohtavuus, pH, suspendoituneet kiintoaineet, liuennut happi, fluorimetriset estimaatit sinilevälle ja klorofylli-a:lle, sekä kasviplanktoninja zooplanktonin tiheys ja lajisto. Arvioitu jokihelmisimpukkamäärä tutkitulla 500 metrin matkalla oli 32000 yksilöä. Jokien välisiä eroja mitattujen muuttujien käyttäytymisessä suhteessa etäisyyteen järvestä tutkittiin regressioanalyysillä. Tulokset viittasivat siihen, että M. margaritifera alentaa siniviherlevien, klorofylli-a:n ja liuenneen hapen pitoisuuksia sekä kasvuplanktonin ja zooplanktonin tiheyttä. Tuloksista voidaan päätellä, että ainakin tiheä M. margaritifera -esiintymä saattaa pystyä vaikuttamaan veden laatuun ja jokiekosysteemin toimintaan. Freshwater mussels (Unionoida) can provide valuable ecosystem services through their filtration function, consequently improving or affecting water quality. The endangered freshwater pearl mussel Margaritifera margaritifera used to occur and can still occasionally occur in high densities. However, no study has been conducted regarding how M. margaritifera influences river ecosystem and water quality. The aim of this study was to investigate the impact of M. margaritifera on the boreal river through analysing water quality parameters, phytoplankton and zooplankton. Thus, two closely located rivers— M. margaritifera river and control river (no mussel)—in northern Finland were compared using water samples and in situ measurements performed at 50 m intervals from the first 500 m section downstream from the headwater lake of both rivers. Variables studied included water temperature, conductivity, pH, total suspended solids, optical dissolved oxygen and fluorometric estimates of blue-green algae and chlorophyll-a, as well as density and species composition of phytoplankton and zooplankton, in addition to M. margaritifera count. The estimated number of M. margaritifera in 500 m study section was about 32000. The response of measured variables in relation to the distance from the lake to the rivers were studied by regression analysis. The results point to the likelihood that M. margaritifera reduce blue-green algae, chlorophyll-a and dissolved oxygen as well as phytoplankton and zooplankton density, suggesting potentially remarkable ecosystem effect and influence on water quality by M. margaritifera when occurring in high density.
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Mit\u00e4\u00e4n tutkimusta ei kuitenkaan ole tehty siit\u00e4, miten uhanalainen Margaritifera margaritifera\u2014joka on aikaisemmin esiintynyt (ja voi esiinty\u00e4 viel\u00e4 nyky\u00e4\u00e4nkin paikoittain) hyvin suurina tiheyksin\u00e4\u2014vaikuttaa jokiekosysteemiin ja veden laatuun. T\u00e4m\u00e4n tutkimuksen tarkoituksena oli tutkia jokihelmisimpukoiden vaikutuksia jokiin analysoimalla veden laatuparametreja sek\u00e4 kasviplanktonin ja zooplanktonin tiheytt\u00e4 kahdessa pohjois-suomalaisessa, l\u00e4hekk\u00e4in sijaitsevassa joessa, joista toisessa esiintyy tihe\u00e4 jokihelmisimpukkakanta, mutta toisessa simpukoita ei ole. Tutkimus tehtiin ker\u00e4\u00e4m\u00e4ll\u00e4 vesin\u00e4ytteit\u00e4 ja suorittamalla mittauksia paikan p\u00e4\u00e4ll\u00e4 500 metrin matkalla kymmenest\u00e4 pisteest\u00e4 50 metrin v\u00e4lein jokien yl\u00e4puolella sijaitsevasta j\u00e4rvest\u00e4 alkaen. 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spellingShingle Begum, Khaleda Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality molluscs Akvaattiset tieteet Aquatic sciences 4012 vedenlaatu joet jokihelmisimpukka ekosysteemit plankton water quality rivers Margaritana margaritifera ecosystems
title Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
title_full Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
title_fullStr Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
title_full_unstemmed Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
title_short Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
title_sort effects of the endangered freshwater pearl mussel margaritifera margaritifera on river ecosystem and water quality
title_txtP Effects of the endangered freshwater pearl mussel Margaritifera margaritifera on river ecosystem and water quality
topic molluscs Akvaattiset tieteet Aquatic sciences 4012 vedenlaatu joet jokihelmisimpukka ekosysteemit plankton water quality rivers Margaritana margaritifera ecosystems
topic_facet 4012 Akvaattiset tieteet Aquatic sciences Margaritana margaritifera ecosystems ekosysteemit joet jokihelmisimpukka molluscs plankton rivers vedenlaatu water quality
url https://jyx.jyu.fi/handle/123456789/62770 http://www.urn.fi/URN:NBN:fi:jyu-201902131486
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