Startsida
Hjälp
Sök i LIBRIS databas

     

 

Sökning: onr:r1335f7npf36v8l4 > Importance of bacte...

Importance of bacterial maintenance respiration and baseline respiration for development of coastal hypoxia / Kevin Vikström.

Vikström, Kevin, 1988- (författare)
Wikner, Johan, 1961- (preses)
Karlsson, Jan, 1974- (preses)
Gasol, Josep M. (opponent)
Umeå universitet. Institutionen för ekologi, miljö och geovetenskap (utgivare)
Publicerad: Umeå : Umeå Universitet, 2018
Engelska 40 sidor
Läs hela texten (Fritt tillgänglig via Umeå universitet)
Läs hela texten (Fritt tillgänglig via Umeå universitet)
  • E-bokAvhandling(Diss. (sammanfattning) Umeå : Umeå universitet, 2018)
Sammanfattning Ämnesord
Stäng  
  • Reduced oxygen concentrations and increasing hypoxic zones havebecome more common in the sea due to climate change andeutrophication. The main cause of oxygen loss in oxygenatedenvironments is respiration. Respiration rates can be estimated usingoptode methodologies which utilize dynamic luminescence quenching toestimate the oxygen concentration declines in dark incubations. Apublished optode methodology was improved by using optodes withtitanium housing instead of plastic housing plausibly trapping oxygen.Drift was highly reduced by the titanium casings leading to a higherprecision and lower detection limit of 0.97 mmol O 2 m -3 d -1 . 28% ofmeasurements were shown to have non-linear oxygen concentrationdeclines. The rate of oxygen change was derived with a 2nd degreepolynomial at 1 hour from the incubation start. The majority of non-lineardeclines were concave and due to carbon substrate limitation. Analyzingnon-linear trends linearly, a common practice, leads to anunderestimation of respiration by up to 64%. Bacterial maintenance respiration (R m ) was studied using anecophysiological model unverified in natural environments. The modelwas applicable at high productivities but a quadratic model wasdemonstrated to give a better fit. R m was found to represent a significantpart in the sub-arctic estuary contributing to 58% of the annual specificbacterial respiration. Therefore, R m may be more important in nature thanpreviously recognized. The ecophysiological model is driven solely by thebacterial specific growth rate (μ) where the relative influence of Rm iselevated as μ decreases. As a consequence, I hypothesize that a reductionin nutrients may not decrease the oxygen consumption but rather shiftbacterial growth based respiration to Rm as μ approaches zero.Baseline respiration (R bl ), defined as ecosystem respiration disconnectedfrom contemporary primary produced carbon, was also studied. R bl wasshown to be largely supplied by allochthonous carbon in a coastalecosystem and had a contribution of 50% to the annual planktoncommunity respiration in the sub-arctic estuary studied. I claim that Rbland R m are crucial to include for understanding and managingdevelopment of aquatic hypoxia in an effective and economic manner. 

Ämnesord

Marinekologi  (sao)
Kuster  (sao)
Syre  (sao)
Bakterier  (sao)
Andning  (sao)
Natural Sciences  (hsv)
Biological Sciences  (hsv)
Ecology  (hsv)
Naturvetenskap  (hsv)
Biologiska vetenskaper  (hsv)
Ekologi  (hsv)
Marine ecology  (LCSH)
Respiration  (LCSH)
Bacteria  (LCSH)
Östersjön  (sao)

Genre

Indexterm och SAB-rubrik

Ecology
Respiration
Estuarine
Allochthonous
Maintenance
primary production
bacterial production

Klassifikation

577.7 (DDC)
Ue.055 (kssb/8 (machine generated))
Inställningar Hjälp

Titeln finns på 1 bibliotek. 

Bibliotek i norra Sverige (1)

Ange som favorit
Om LIBRIS
Sekretess
Blogg
Hjälp
Fel i posten?
Kontakt
Teknik och format
Sök utifrån
Sökrutor
Plug-ins
Bookmarklet
Anpassa
Textstorlek
Kontrast
Vyer
LIBRIS söktjänster
SwePub
Sondera
Uppsök

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

Copyright © LIBRIS - Nationella bibliotekssystem

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy