Does dissolved organic matter impact primary production? A study on the effects of terrestrially derived dissolved organic matter on primary production in nutrient-poor boreal lakes

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dc.contributor.authorSherbo, Bryanna
dc.contributor.examiningcommitteeTreberg, Jason (Biological Sciences) Mundy, CJ (Environment and Geography)en_US
dc.contributor.supervisorHann, Brenda (Biological Sciences) Higgins, Scott (Biological Sciences, International Institute for Sustainable Development-Experimental Lakes Area)en_US
dc.date.accessioned2020-09-09T12:35:19Z
dc.date.available2020-09-09T12:35:19Z
dc.date.copyright2020-08-23
dc.date.issued2020en_US
dc.date.submitted2020-08-23T15:16:52Zen_US
dc.degree.disciplineBiological Sciencesen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractOver the past few decades, spatial and temporal variation in concentrations of allochthonous dissolved organic carbon (DOC) has been increasing in surface waters of boreal lakes around the world with climate change. Terrestrial landscapes export large amounts of organic matter into lakes, primarily as DOC. It is understood that DOC impacts primary production through its combined effects on light and nutrient availability. However, there remains uncertainty as to the mechanisms that cause DOC to have positive or negative effects on algal productivity. In a survey of 6-7 lakes spanning a DOC gradient (3.5-9.4 mg L-1) at International Institute of Sustainable Development-Experimental Lakes Area (IISD-ELA) in northwestern Ontario, we determined the effects of DOC on whole-lake metabolism (gross primary production (GPP), respiration, and net ecosystem production (NEP)) and depth integrated net primary production (NPP). Using in situ diel free-water oxygen method and in vitro partial pressure of CO2 incubations, we found that primary production was significantly impacted by DOC. In general, the effects of DOC on algal productivity was negative, although there was some evidence for the stimulation of whole ecosystem production by nutrients at low DOC concentrations. Epilimnetic chlorophyll, GPP, and community respiration increased significantly with DOC, and total depth integrated and sub-epilimnetic NPP decreased significantly with DOC. Lakes with the highest proportion of sub-epilimnetic production had well developed deep chlorophyll maxima (DCM). DCM were negatively correlated with DOC and are viewed as ecological hotspots for higher trophic levels. DCM and sub-epilimnetic productivity were eliminated in lakes with DOC values > 7.1 mg L-1. These results substantiate the influence of allochthonous DOC on aquatic food webs and highlight the combined effects of DOC on light and nutrient availability. The association of DOC with epilimnetic nutrients caused an increase in epilimnetic GPP (chapter 2) and decreasing light availability caused a decrease in total and sub-epilimnetic NPP (chapter 3). These contrasting effects of DOC on primary production provide further insight into the balance between nutrients and light with increasing concentrations of DOC.en_US
dc.description.noteOctober 2020en_US
dc.identifier.urihttp://hdl.handle.net/1993/35010
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectBoreal lakesen_US
dc.subjectPrimary productionen_US
dc.subjectDissolved organic carbonen_US
dc.subjectExperimental Lakes Areaen_US
dc.titleDoes dissolved organic matter impact primary production? A study on the effects of terrestrially derived dissolved organic matter on primary production in nutrient-poor boreal lakesen_US
dc.typemaster thesisen_US
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