umu.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
High rates of daytime respiration in three streams: Use of delta O-18(O2) and O-2 to model diel ecosystem metabolism
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
2014 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 59, nr 3, s. 798-810Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Photosynthesis and respiration determine the carbon and oxygen (O-2) balance of ecosystems. Current methods used to estimate ecosystem respiration (ER) do not include diel ER fluctuations, which limit testing predictions about short-term drivers of ecosystem metabolism. Diel changes in delta O-18(O2) can be used to estimate diel ER due to discrimination against O-18(O2) during respiration. We monitored diel delta O-18(O2), O-2, light, and water temperature in three Wyoming streams and measured respiration fractionation (alpha(R)) against O-18(O2) in dark benthic flow chambers in two streams. The ranges of measured and literature alpha(R) values were used to estimate uncertainty in metabolism parameters associated with not measuring alpha(R) directly. Daytime ER was 54-340% higher than nighttime ER using delta O-18(O2), but diel ER parameter estimates were highly uncertain relative to traditional estimates of ecosystem metabolism. Diel variations in water temperature only accounted for 4-55% of the range of diel ER calculated using diel delta O-18(O2). Measured benthic flow chamber alpha(R) varied within the range of literature values: from 0.9755 to 0.9954. Metabolism parameter estimates were very sensitive to choice of alpha(R) within the measured and published range of values. The mean and uncertainty of diel ER estimates increased with decreasing alpha(R), with daily ER more than ten times higher given an alpha(R) of 0.975 vs. 0.999. Diel changes in ER can be modeled using delta O-18(O2) and O-2, but diel ER estimates depend on the choice of alpha(R), suggesting the need to better understand how alpha(R) may vary within spatial and temporal scales appropriate for delta O-18(O2) metabolism models.

Ort, förlag, år, upplaga, sidor
2014. Vol. 59, nr 3, s. 798-810
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:umu:diva-92679DOI: 10.4319/lo.2014.59.3.0798ISI: 000339904300013OAI: oai:DiVA.org:umu-92679DiVA, id: diva2:742798
Tillgänglig från: 2014-09-02 Skapad: 2014-09-01 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

Open Access i DiVA

High rates of daytime respiration in three streams: Use of d18OO2 and O2 to model diel ecosystem metabolism(508 kB)326 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 508 kBChecksumma SHA-512
ddd1667dd269277b5c4d34d4b8209e4879ff72e99718c867de6f8aa470414a5fe44fad5f9fef7437e757752b5e45c20d1690b2bfc872e917bcfc84891094fbaa
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltext

Personposter BETA

Hotchkiss, Erin

Sök vidare i DiVA

Av författaren/redaktören
Hotchkiss, Erin
Av organisationen
Institutionen för ekologi, miljö och geovetenskap
I samma tidskrift
Limnology and Oceanography
Ekologi

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 326 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 185 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf