Effects of Additions of DOC on Pelagic Biota in a Clearwater System: Results from a Whole Lake Experiment in Northern Sweden

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

doi:10.1007/s002480000101

Cited by 75 publications

(76 citation statements)

References 28 publications

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“…The same phenomenon was observed during a whole-lake experiment with sucrose addition (Blomqvist et al, 2001). What is more, previous research has realized that some bacteria may produce a variety of compounds, including toxic proteins, polyanionic polymers, substituted alkaloids, and cyclic peptides, which showed inhibitory activity on some algal spores germination (review in: Agrawal, 2009).…”

Section: Discussionsupporting

confidence: 68%

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The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

2014

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The effect of two various forms of DOC on the Gonyostomum semen recruitment from sediments was conducted under experimental laboratory conditions. We tested the hypothesis that DOC is a factor enhancing spring recruitment of the species by exposing sediments from a humic lake with a 17-year bloom history, to three various DOC additions (two solutions of glucose and one solution of a peat extract). Sediments and lake water were incubated for 14 days at 16°C, in 14:10 h light:dark cycle, with germling and adult cell abundance ascertained in the water every third day, and water parameters every seventh day. Our important findings were that (1) Gonyostomum recruitment was uneven and the period of germination was relatively short; (2) all treatments significantly affected germling occurrence; however, sugar-derived DOC seemed to suppress the recruitment, whereas peat extract improved it. Due to the additional phosphorus load in peat treatment (against phosphorus-free sugar treatments), it is likely that it played a major role in the observed differences, however, our results did not exclude the potential role of peatderived DOC forms. In conclusion, we proposed that Gonyostomum expansion is supported by enhanced recruitment from sediment seed banks related to water chemistry alterations, driven by the climate change.

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Section: Discussionsupporting

confidence: 68%

“…We had decided to use the carbohydrate as it is a colorless, nitrogen-and phosphorus-free form of DOC, and it was previously applied in other experimental studies concerning DOC addition to lake ecosystem (Blomqvist et al, 2001).…”

Section: Methodsmentioning

confidence: 99%

The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

2014

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“…In this study we used data from SRLMP from the time period 1996-2001. To compensate for the somewhat higher distribution of SRLMP lakes in southern Sweden, we complemented our data set with published results from different research projects (Jansson et al 1996 and2000;Blomqvist et al 2001;Karlsson 2001;Sobek et al 2003) where sampling occasions and procedures, as well as analytical procedures, are comparable to the procedures in the SRLMP lakes. The contribution from different research projects was 37 lakes distributed as: 6 lakes in region 3, 5 lakes in region 9, 10 lakes in region 12, and 16 lakes in region 13.…”

Section: Methodsmentioning

confidence: 99%

Effects of atmospheric nitrogen deposition on nutrient limitation and phytoplankton biomass in unproductive Swedish lakes

Bergström

Blomqvist

Jansson

2005

Limnology & Oceanography

141

157

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We used chemical data (3,907 lakes) and phytoplankton biomass (chlorophyll a) data (225 lakes) from Swedish lake monitoring programs to assess the effects of atmospheric nitrogen (N) deposition on nutrient limitation and phytoplankton biomass in unproductive Swedish lakes. There was a clear north-south gradient of increasing lake concentrations of dissolved inorganic nitrogen, which was related to the pattern of atmospheric N input. On the basis of positive relationships between total phosphorus (P) concentrations and phytoplankton biomass we conclude that lakes in areas of enhanced N deposition are mainly P limited during summer. This relationship was not detected in lakes in pristine areas with low N deposition, which, together with experimental evidence from the literature, suggest possible N limitation. During summer, lakes in high N-deposition areas had clearly higher phytoplankton biomass relative to the total phosphorus concentrations compared to lakes in low N-deposition areas. Thus, in Swedish unproductive lakes, high atmospheric N input is reflected by increased lake concentrations of dissolved inorganic nitrogen and, possibly, by a shift from natural N limitation of phytoplankton to P limitation. Our results also reveal that increased N input has caused a eutrophication with higher phytoplankton biomass as the result.

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“…The balance between heterotrophic and autotrophic energy mobilization is largely controlled by the ratio of allochthonous organic C to inorganic nutrients (Blomqvist et al 2001;Cole et al 2002;Jansson et al 2006). In systems with high availability of organic C relative to inorganic nutrients, bacterioplankton will outcompete phytoplankton for limiting nutrients (e.g., P and N) (Vadstein 2000).…”

Section: Effect Of Elevated Nutrient Carbon and Sediment Loads On Wmentioning

confidence: 99%

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

2014

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Wetland environments are important sites for the cycling and retention of terrestrially derived organic matter and nutrients. Wetland treatment of agricultural runoff has been shown to improve water quality and promote carbon sequestration. However, the potential role of eutrophic wetlands as a source of algal loading contributing to downstream hypoxia has prompted interest in understanding algal productivity and export from these systems. This study, in the San Joaquin Valley, California, quantified a mass balance of carbon and nutrients within a seasonally-saturated constructed wetland receiving agricultural runoff, as well as quantifying autochthonous carbon production on four sampling dates during a year with minimal emergent vegetation. Results from this study show that the wetland was a net-sink for nutrients and particulate/dissolved organic carbon. Despite high concentrations of inflowing nutrients and high rates of primary productivity, high respiration rates limited net organic C production and export due to high heterotrophic activity. The addition of high C loads in inflowing water and moderate retention efficiencies, however, resulted in a positive C retention during most sampling dates. This study provides valuable insight into the connection between elevated carbon and nutrient inflows, their effects on autochthonous carbon production, and resulting carbon and nutrient outflows.

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Effects of Additions of DOC on Pelagic Biota in a Clearwater System: Results from a Whole Lake Experiment in Northern Sweden

Cited by 75 publications

References 28 publications

The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

The influence of glucose and peat extract additions on the spring recruitment of Gonyostomum semen from the sediments

Effects of atmospheric nitrogen deposition on nutrient limitation and phytoplankton biomass in unproductive Swedish lakes

Autochthonous and Allochthonous Carbon Cycling in a Eutrophic Flow-Through Wetland

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