University of Jyväskylä | JYX Digital Repository

  • English  | Give feedback |
    • suomi
    • English
 
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  • JYX
  • Opinnäytteet
  • Pro gradu -tutkielmat
  • View Item
JYX > Opinnäytteet > Pro gradu -tutkielmat > View Item

A stable isotope study of the hydrological and carbon cycle in meromictic lake, Lovojärvi

Thumbnail
View/Open
1.6 Mb

Downloads:  
Show download detailsHide download details  
Authors
Mutyaba, Colline
Date
2012
Discipline
Akvaattiset tieteetAquatic sciences

 
Lake Lovojärvi, at its deepest point of 17.5 m, is permanently stratified forming two water layers. The mixolimnion (the upper layer, from 0 to 10 m depth) is affected by seasonal changes while the monimolimnion (bottom layer, from 10 to 17.5 m depth) does not mix and is not affected by seasonal changes. As a result, the lake stores large quantities of dissolved inorganic carbon and methane. I used a multiple stable isotope approach to gain insight into the carbon cycle and water balance of Lovojärvi. The δ18O and δ2H profiles reveal that at the 7 m depth in the mixolimnion, there is a sub-surface stream whose isotopic characteristics are similar to surface streams from a nearby mire, suggesting that this water could be coming from the mire. Measurements of δ13C-DIC and of concentrations of DIC and CH4 were used to trace carbon flow in the lake. Variations in the epilimnion of DIC concentration and of δ13C-DIC (ranging from -15.42 to -5.75‰) are explained by photosynthesis, while the strongly enriched 13C-DIC and high concentrations of DIC and CH4 in the deep water are explained by organic matter oxidation and methanogenesis. Methanotrophy appears to be an important source of carbon to the food web evidenced by the depleted 13C-zooplankton (-38.2‰). ...
Keywords
Dissolved inorganic carbon methane organic matter stable isotopes stratification kerrostuneisuus metaani orgaaniset aineet isotoopit hiili Lovojärvi
URI

http://urn.fi/URN:NBN:fi:jyu-201301221096

Metadata
Show full item record
Collections
  • Pro gradu -tutkielmat [24946]

Related items

Showing items with similar title or keywords.

  • CH4 oxidation in a boreal lake during the development of hypolimnetic hypoxia 

    Saarela, Taija; Rissanen, Antti J.; Ojala, Anne; Pumpanen, Jukka; Aalto, Sanni L.; Tiirola, Marja; Vesala, Timo; Jäntti, Helena (Birkhaeuser Science, 2020)
    Freshwater ecosystems represent a significant natural source of methane (CH4). CH4 produced through anaerobic decomposition of organic matter (OM) in lake sediment and water column can be either oxidized to carbon dioxide ...
  • Microbial controls of greenhouse gas emissions from boreal lakes 

    Saarenheimo, Jatta (University of Jyväskylä, 2015)
  • Abundance and δ13C values of fatty acids in lacustrine surface sediments : Relationships with in-lake methane concentrations 

    Stötter, Tabea; Bastviken, David; Bodelier, Paul L.E.; van Hardenbroek, Maarten; Rinta, Päivi; Schilder, Johannes; Schubert, Carsten J.; Heiri, Oliver (Pergamon Press, 2018)
    Proxy-indicators in lake sediments provide the only approach by which the dynamics of in-lake methane cycling can be examined on multi-decadal to centennial time scales. This information is necessary to constrain how ...
  • The influence of lipid content and taxonomic affiliation on methane and carbon dioxide production from phytoplankton biomass in lake sediment 

    Hiltunen, Minna; Nykänen, Hannu; Syväranta, Jari (John Wiley & Sons, 2021)
    The greenhouse gases methane (CH4) and carbon dioxide (CO2) are end products of microbial anaerobic degradation of organic matter (OM) in lake sediments. Although previous research has shown that phytoplankton lipid content ...
  • Integrating Decomposers, Methane-Cycling Microbes and Ecosystem Carbon Fluxes Along a Peatland Successional Gradient in a Land Uplift Region 

    Juottonen, Heli; Kieman, Mirkka; Fritze, Hannu; Hamberg, Leena; Laine, Anna M.; Merilä, Päivi; Peltoniemi, Krista; Putkinen, Anuliina; Tuittila, Eeva-Stiina (Springer Science+Business Media, 2022)
    Peatlands are carbon dioxide (CO2) sinks that, in parallel, release methane (CH4). The peatland carbon (C) balance depends on the interplay of decomposer and CH4-cycling microbes, vegetation, and environmental conditions. ...
  • Browse materials
  • Browse materials
  • Articles
  • Conferences and seminars
  • Electronic books
  • Historical maps
  • Journals
  • Tunes and musical notes
  • Photographs
  • Presentations and posters
  • Publication series
  • Research reports
  • Research data
  • Study materials
  • Theses

Browse

All of JYXCollection listBy Issue DateAuthorsSubjectsPublished inDepartmentDiscipline

My Account

Login

Statistics

View Usage Statistics
  • How to publish in JYX?
  • Self-archiving
  • Publish Your Thesis Online
  • Publishing Your Dissertation
  • Publication services

Open Science at the JYU
 
Data Protection Description

Accessibility Statement

Unless otherwise specified, publicly available JYX metadata (excluding abstracts) may be freely reused under the CC0 waiver.
Open Science Centre