Allochthonous Organic Carbon and Phytoplankton/Bacterioplankton Production Relationships in Lakes

Jansson, Mats; Bergström, Ann‐Kristin; Blomqvist, Peter; Drakare, Stina

doi:10.2307/177416

Cited by 139 publications

(198 citation statements)

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“…Water colour, as measured, is indicative of the amount of coloured dissolved organic carbon (CDOC) present in the water column, typically in the form of humic and fulvic acids (Cuthbert and Delgiorgio 1992;Pace and Cole 2002). CDOC forms as a by-product of degradation/decomposition of organic matter (Jansson et al 2000;Koelmans and Prevo 2003), and in this experiment, because mesocosms were closed to all external organic carbon sources (i.e. runoff of organic material from the surrounding terrestrial landscape), the organic carbon substrate being degraded and producing CDOC was carbon in mesocosm sediments and water column (Cuthbert and Delgiorgio 1992;Eiler et al 2003;Houser et al 2003;Pace and Cole 2002).…”

Section: Discussionmentioning

confidence: 99%

Experimental warming increases CO2 saturation in a shallow prairie pond

Flanagan¹,

McCauley

2010

Aquat Ecol

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There is an urgent need to understand the effect of climate warming on the carbon dynamics of lakes and ponds in order to assess contributions to global carbon budgets. Currently, we are unable to predict how the exchange of carbon gases (i.e. CO 2 ) across the air-water boundary and organic carbon storage in the sediments will be altered with realistic warming scenarios downscaled from climatic models. Given the prevalence of shallow systems and tight atmospheric coupling, we conducted a mesocosm experiment to test the impacts of warming on CO 2 saturation in a shallow prairie pond. We outline and test three possible scenarios for the effect of warming on the CO 2 saturation of ponds, resulting in either an increase, decrease or no net effect for CO 2 saturation. We show that with approximately a two-degree (8C) increase in average water temperature, the pCO 2 of the warmed mesocosms was nine times greater than the ambient temperature mesocosms by the end of the 5-week experiment. Changes in water colour (a measure of dissolved organic carbon) in warmed systems indicate that decomposition of organic matter in the sediments and water column was the main contributor to the increase in pCO 2 in the warmed mesocosms. Our results show that with warming, the release of CO 2 from shallow ponds to the atmosphere will increase and carbon storage in the sediments will decrease, altering the current functioning of shallow prairie ponds and influencing the contribution of ponds to the global carbon cycle.

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Section: Discussionmentioning

confidence: 99%

Experimental warming increases CO2 saturation in a shallow prairie pond

Flanagan¹,

McCauley

2010

Aquat Ecol

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“…In addition, increased soil temperatures following clear-cutting accelerate mineralization and nitrification in the soil (Paavolainen and Smolander 1998;Smolander et al 2001) and nutrients are released from decomposing logging residues (Palviainen et al 2004). Clear-cutting may also increase total or dissolved organic carbon (TOC, DOC) export (Lamontagne et al 2000;Schelker et al 2012Schelker et al , 2014, which have implications for catchment carbon budgets (Schelker et al 2012), the structure of aquatic food webs (Jansson et al 2000), the acid-base chemistry of surface waters (Buffam et al 2008), and the mobility, toxicity, and bioavailability of trace metals and organic pollutants (Porvari et al 2003;Bergknut et al 2011). The impacts on water quality are long-term and they are generally at its greatest during the first years after clear-cutting (Rosén et al 1996;Ahtiainen and Huttunen 1999;Palviainen et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A method to estimate the impact of clear-cutting on nutrient concentrations in boreal headwater streams

Palviainen

Finér

Laurén

et al. 2015

Ambio

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Large-scale forestry operations, like clearcutting, may impair surface water quality if not done with environmental considerations in mind. Catchment and country level estimates of nutrient loads from forestry are generally based on specific export values, i.e., changes in annual exports due to the implemented forestry operations expressed in kg ha -1 . We introduce here a specific concentration approach as a method to estimate the impact of clear-cutting on nutrient concentrations and export in headwater streams. This new method is potentially a more dynamic and flexible tool to estimate nutrient loads caused by forestry, because variation in annual runoff can be taken into account in load assessments. We combined water quality data from eight boreal headwater catchment pairs located in Finland and Sweden, where the effect of clear-cutting on stream water quality has been studied experimentally. Statistically significant specific concentration values could be produced for total nitrogen, nitrate, ammonium, and phosphate. The significant increases in the concentrations of these nutrients occurred between 2 and 6 years after clearcutting. Significant specific concentration values could not be produced for total phosphorus and total organic carbon with the whole dataset, although in some single studies significant increases in their concentrations after clear-cutting were observed. The presented method enables taking into account variation in runoff, temporal dynamics of effects, and the proportional size of the treated area in load calculations. The number of existing studies considering large site-specific variation in responses to clear-cutting is small, and therefore further empirical studies are needed to improve predictive capabilities of the specific concentration values.

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“…Radio-tracer techniques have confirmed that allochthonous carbon can make up the major share of bacterial carbon contents in humic lake water (Kritzberg et al, 2006). Moreover, bacterial biomass and activity in unproductive lakes are often positively correlated with concentrations of allochthonous DOM (Jones, 1992;Bergströ m and Jansson, 2000;Jansson et al, 2000). High support of bacterial metabolism by allochthonous DOM can be an effect of large amounts of DOM compensating for the low specific degradation rates (Wetzel, 1995) or that allochthonous DOM can be modified by ultraviolet radiation producing labile LMW DOM (Bertilsson and Tranvik, 1998).…”

Section: Introductionmentioning

confidence: 99%

Efficient aquatic bacterial metabolism of dissolved low-molecular-weight compounds from terrestrial sources

et al. 2009

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Carboxylic acids (CAs), amino acids (AAs) and carbohydrates (CHs) in dissolved free forms can be readily assimilated by aquatic bacteria and metabolized at high growth efficiencies. Previous studies have shown that these low-molecular-weight (LMW) substrates are released by phytoplankton but also that unidentified LMW compounds of terrestrial origin is a subsidy for bacterial metabolism in unproductive freshwater systems. We tested the hypothesis that different terrestrially derived CA, AA and CH compounds can offer substantial support for aquatic bacterial metabolism in fresh waters that are dominated by allochthonous dissolved organic matter (DOM). Drainage water from three catchments of different characters in the Krycklan experimental area in Northern Sweden were studied at the rising and falling limb of the spring flood, using a 2-week bioassay approach. A variety of CA, AA and CH compounds were significantly assimilated by bacteria, meeting 15-100% of the bacterial carbon demand and explaining most of the observed variation in bacterial growth efficiency (BGE; R 2 ¼ 0.66). Of the 29 chemical species that was detected, acetate was the most important, representing 45% of the total bacterial consumption of all LMW compounds. We suggest that LMW organic compounds in boreal spring flood drainage could potentially support all in situ bacterial production in receiving lake waters during periods of weeks to months after the spring flood.

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Allochthonous Organic Carbon and Phytoplankton/Bacterioplankton Production Relationships in Lakes

Cited by 139 publications

References 0 publications

Experimental warming increases CO2 saturation in a shallow prairie pond

Experimental warming increases CO2 saturation in a shallow prairie pond

A method to estimate the impact of clear-cutting on nutrient concentrations in boreal headwater streams

Efficient aquatic bacterial metabolism of dissolved low-molecular-weight compounds from terrestrial sources

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