Pelagic responses to changes in dissolved organic carbon following division of a seepage lake

Christensen, David L.; Carpenter, Stephen R.; Cottingham, Kathryn L.; Knight, Susan E.; LeBouton, Joseph P.; Schindler, Daniel E.; Voichick, Nicholas; Cole, Jonathan J.; Pace, Michael L.

doi:10.4319/lo.1996.41.3.0553

Cited by 58 publications

(57 citation statements)

References 12 publications

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“…Thus, in areas experiencing increases in MAP, our study suggests the abundance of polyphenols will increase, diminishing the influence of in-lake processing on DOM quality. An increase in vascular plant-derived polyphenols in lakes would reduce light penetration, oxygen penetration and stratification depths 32 , increase heterotrophy 5,10 and decrease overall productivity 6 , with changes in the quality of DOM in source waters having clear implications for drinking water treatment 33 . Furthermore, increased delivery of polyphenols to coastal areas could increase light-mediated bacterial production 19 , straining areas that are already O 2 limited.…”

Section: Discussionmentioning

confidence: 99%

Chemodiversity of dissolved organic matter in lakes driven by climate and hydrology

et al. 2014

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Despite the small continental coverage of lakes, they are hotspots of carbon cycling, largely due to the processing of terrestrially derived dissolved organic matter (DOM). As DOM is an amalgam of heterogeneous compounds comprising gradients of microbial and physicochemical reactivity, the factors influencing DOM processing at the molecular level and the resulting patterns in DOM composition are not well understood. Here we show, using ultrahigh-resolution mass spectrometry to unambiguously identify 4,032 molecular formulae in 120 lakes across Sweden, that the molecular composition of DOM is shaped by precipitation, water residence time and temperature. Terrestrially derived DOM is selectively lost as residence time increases, with warmer temperatures enhancing the production of nitrogen-containing compounds. Using biodiversity concepts, we show that the molecular diversity of DOM, or chemodiversity, increases with DOM and nutrient concentrations. The observed molecular-level patterns indicate that terrestrially derived DOM will become more prevalent in lakes as climate gets wetter.

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Section: Discussionmentioning

confidence: 99%

Chemodiversity of dissolved organic matter in lakes driven by climate and hydrology

et al. 2014

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“…Inflowing groundwater moves across organically rich sediments within the littoral zone of the east basin, while in the west basin littoral sediments have a higher sand content (Christensen et al 1996). As a consequence of curtaining, DOC, acidity, and water color increased in east Long (Christensen et al 1996). Accompanying these changes, fish populations declined and both piscivory and planktivory were nil for most of the experiment (J. F. Kitchell and D. E. Schindler pcrs.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Methods for sampling and analysis are described in Carpenter et al (1996) and Christensen et al (1996). Samples for chlorophyll, phytoplankton, and zooplankton were taken weekly in each lake from late May to early September.…”

Section: Methodsmentioning

confidence: 99%

“…The whole-lake cxpcriments were designed to examine the response of three trcatmcnt basins (Peter, east and west Long) to similar nutrient loadings under contrasting food web structures. The general experiment as well as the specific responses of phytoplankton and zooplankton have been reported elsewhere (Carpenter et al 1995(Carpenter et al , 1996Christensen et al 1996). Here, we briefly summarize the key differences in food web structure and nutrient loading to facilitate interpretation of the responses of bacteria.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…Curtain placement in east Long resulted in an unexpected change. Inflowing groundwater moves across organically rich sediments within the littoral zone of the east basin, while in the west basin littoral sediments have a higher sand content (Christensen et al 1996). As a consequence of curtaining, DOC, acidity, and water color increased in east Long (Christensen et al 1996).…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Regulation of bacteria by resources and predation tested in whole‐lake experiments

Pace

Cole

1996

Limnology & Oceanography

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112

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Food webs in three lakes were manipulated by altering fish communities to promote or suppress the abundance of large Daphnia. These lakes and an unmanipulated reference lake were monitored for 2 yr. The three experimental lakes were then fertilized for 2 yr with nitrogen and phosphorus. Bacterial responses to these manipulations were examined by means of weekly measurements of abundance and production. Bacterial production, measured both by thymidine and leucine incorporation, increased substantially in the fertilized lakes, whereas abundance increased a small amount. Timeseries models based on P loading explained substantial variation in both measures of bacterial production, suggesting strong regulation by P. Phytoplankton also increased with fertilization, but covariation of primary production and chlorophyll with bacterial production was relatively weak. Protozoans did not consume the increased bacterial production observed in the fertilized lakes. Bacterial abundance was instead regulated by consumption by Daphnia in at least two of the three fertilized lakes. Interannual variation in bacterial production during the 2 yr of fertilization was related to variation in pH, suggesting that environmental conditions also drive variability in bacterial activity. Overall, the experiments indicate that bacterial abur.dance and production are regulated by nutrients and, at high nutrient loading, by metazoan rather than by protozoan predators. With fertilization, bacterial production increased more rapidly than did abundance because bacterial predators limited abundance. The primary response of bacteria to eutrophication was higher specific growth rates.Planktonic bacteria are an abundant and important component of aquatic ecosystems. The functional significance of planktonic bacteria in biogeochemical cycles, energy flow, and secondary production is now well described (Stockner and Porter 1988;Ducklow and Carlson 1992). Furthermore, the conversion of dissolved organic carbon (DOC) to CO2 by oceanic bacteria is one of several examples where planktonic bacteria mediate key pathways in global biogeochemical cycles (Ducklow and Carlson 1992). Despite the metabolic and biogeochemical significance of planktonic bacteria, ecological factors regulating their abundance, biomass, and productivity remain unclear.One way to examine the ecological regulation of bacteria is to search for general patterns that relate bacterial abundance and productivity to possible regulatory factors. This approach usually requires analyses of data from many systems and explicitly considers bacteria at the ecosystem scale. Three general hypotheses have emerged from these comparative studies. Cole et al. (1988) documented AcknowledgmentsWe thank J. Kitchell, J. Hodgson, S. Carpenter, and their students for establishing the food web manipulations, for data and insights on fish populations, and for occasional shock treatments. S. Carpenter and colleagues shared supporting data on plankton populations, nutrient chemistry, and primary productivit...

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Increasing dissolved organic carbon concentrations in northern boreal lakes: Implications for lake water transparency and thermal structure

et al. 2017

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We evaluated trends in dissolved organic carbon (DOC) and associated changes in water transparency and epilimnion thickness to better understand the implications of regional increases in DOC concentration in lakes. Long‐term monitoring of a suite of physical, chemical, and biological data from six to 12 lakes in Acadia National Park in Maine was paired with high‐frequency sensor monitoring of one lake as a model system. Water transparency declined across study sites since 1995 as DOC increased and chlorophyll remained stable, suggesting that this was not a signal of increased eutrophication. As clarity declined, some lakes experienced reduced epilimnion thickness. The degree to which transparency changed across the lakes was dependent on DOC concentration, with a larger decline in transparency occurring in clear water lakes (−0.3 m yr−1) than brown water lakes (−0.1 m yr−1). DOC concentration was an important explanatory variable for reduced epilimnion thickness in short‐term sensor measurements. A regional decline in water transparency across all lakes and reduction in epilimnion thickness in a limited number of systems appeared to be acting as a sentinel for changes in atmospheric deposition and regional weather that modified the delivery of DOC from the watershed.

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Pelagic responses to changes in dissolved organic carbon following division of a seepage lake

Cited by 58 publications

References 12 publications

Chemodiversity of dissolved organic matter in lakes driven by climate and hydrology

Chemodiversity of dissolved organic matter in lakes driven by climate and hydrology

Regulation of bacteria by resources and predation tested in whole‐lake experiments

Increasing dissolved organic carbon concentrations in northern boreal lakes: Implications for lake water transparency and thermal structure

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