Primary production in two shallow lakes with contrasting plant form dominance: A paradox of enrichment?

Blindow, Irmgard; Hargeby, Anders; Meyercordt, Jürgen; Schubert, Hendrik

doi:10.4319/lo.2006.51.6.2711

Cited by 56 publications

(52 citation statements)

References 50 publications

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“…However, the degree to which these broad differences can be attributed to changes in corresponding regime shifts as opposed to changes in nutrient availability is difficult to say. This is especially the case with shallow lakes, as studies by Vadeboncoeur et al (2008) and Blindow et al (2006) have shown that a loss of benthic primary production with eutrophication may be anticipated with a shift from a clear-water to a turbid regime, potentially outweighing the positive effects of eutrophication on pelagic primary production. In such instances, a decline in heterotrophy following a shift to phytoplankton dominance would not, theoretically, result from an increase in whole-lake primary production, but rather from a decrease in respiration (i.e., C mineralization) rates.…”

Section: Introductionmentioning

confidence: 99%

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

et al. 2013

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Abstract. Ecological regime shifts and carbon cycling in aquatic systems have both been subject to increasing attention in recent years, yet the direct connection between these topics has remained poorly understood. A four-fold increase in sedimentation rates was observed within the past 50 years in a shallow eutrophic lake with no surface in-or outflows. This change coincided with an ecological regime shift involving the complete loss of submerged macrophytes, leading to a more turbid, phytoplanktondominated state. To determine whether the increase in carbon (C) burial resulted from a comprehensive transformation of C cycling pathways in parallel to this regime shift, we compared the annual C balances (mass balance and ecosystem budget) of this turbid lake to a similar nearby lake with submerged macrophytes, a higher transparency, and similar nutrient concentrations. C balances indicated that roughly 80% of the C input was permanently buried in the turbid lake sediments, compared to 40% in the clearer macrophyte-dominated lake. This was due to a higher measured C burial efficiency in the turbid lake, which could be explained by lower benthic C mineralization rates. These lower mineralization rates were associated with a decrease in benthic oxygen availability coinciding with the loss of submerged macrophytes. In contrast to previous assumptions that a regime shift to phytoplankton dominance decreases lake heterotrophy by boosting whole-lake primary production, our results suggest that an equivalent net metabolic shift may also result from lower C mineralization rates in a shallow, turbid lake. The widespread occurrence of such shifts may thus fundamentally alter the role of shallow lakes in the global C cycle, away from channeling terrestrial C to the atmosphere and towards burying an increasing amount of C.

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Section: Introductionmentioning

confidence: 99%

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

et al. 2013

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“…The diatom record shows that as water clarity improved and diatom production increased, the community that was established around 1978 persisted into the clear-water state. Within the cyanobacterial community, however, large changes occurred in 1988, when small, noncolonial cyanobacteria were replaced by colonial, toxic Microcystis botrys and M. aeruginosa, as well as by the golden alga Dinobryon sociale (Blindow et al 2006).…”

Section: Discussionmentioning

confidence: 99%

“…By 1948, the submerged vegetation had recovered in Lake Krankesjön, and in the 1950s and 1960s submerged vegetation was well developed (Karlsson et al 1976). A shift to the turbid state occurred in the mid-1970s, and the lake had sparse submerged vegetation for almost a decade (Blindow et al 2006). In the mid-1980s, submerged vegetation rapidly started to recolonize the lake, and since the late 1980s, the lake has been in a clear-water state, with abundant macrophyte beds.…”

Section: Introductionmentioning

confidence: 99%

“…1), is a shallow, eutrophic lake with a history of structural shifts between two alternative states, one clear and macrophyte-dominated and the other turbid and algaldominated, in spite of supposedly very little change in external nutrient loading (Blindow et al 2006). These shifts have been documented for almost a century, in reports on the abundance of herbivorous waterfowl and notes on water clarity (Swanberg 1931;Almestrand and Lundh 1951;Thomasson 1956;Forsberg 1964;Hansson et al 2010), which are summarized in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake

et al. 2014

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In this study, we demonstrate that an integrated approach, combining palaeolimnological records and limnological monitoring data, can increase our understanding of changing ecological patterns and processes in shallow lakes. We focused on recent regime shifts in shallow Lake Krankesjön, southern Sweden, including the collapse of the clearwater state in 1975 and its subsequent recovery in the late 1980s. We used diatom, hydrocarbon and biogenic silica sediment records, in concert with limnological data sets on nutrient concentrations, water clarity, chlorophyll-a and water depth, to investigate the shifts. The shift from clear to turbid conditions was abrupt and occurred over 1 to 2 years, whereas recovery of the clear-water state was more gradual, taking 4-5 years. In 1978, shortly after the first regime shift in water clarity, the diatom community underwent a significant shift. It became less diverse, with decreased abundance of epiphytic and planktonic taxa. Despite rising phosphorus concentrations and lower abundance of submerged macrophytes, Lake Krankesjön has remained in the clear-water state over the past 20 years, although this state seems to be increasingly unstable and susceptible to collapse. The complex reactions of the entire lake ecosystem to major changes in lake-water clarity, as shown by the Paleolimnol (2014) 51:437-448 DOI 10.1007 palaeolimnological variables investigated in this study, emphasize the importance of careful lake and catchment management if a stable, clear-water state is desired.

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“…Submerged macrophytes, which are the main aquatic primary producers, act as indicators of the ecological quality of freshwater ecosystems because they can improve water transparency, purify water quality, and maintain water biodiversity [1][2].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Effects of Grass Carp Excretion and Herbivory of Submerged Macrophytes on Water Quality and Zooplankton Communities

Sun¹,

Ma²,

Wang³

et al. 2017

Pol. J. Environ. Stud.

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Grass carp (Ctenopharyngodon idella) play an important role in the ecological restoration of water bodies, and it is crucial to understand the mechanism behind this. An experiment was performed in tanks consisting of three treatments: 1) without fish (control treatment, CON), 2) with fish unable to feed on submerged macrophytes (excretion treatment, EXCR), and 3) with fish swimming free (herbivory plus excretion treatment, HERB-EXCR). Treatments were conducted with varying macrophytic compositions (Vallisneria natans (Lour.) Hara, Ceratophyllum demersum L., and both species) and carp densities (low, medium, and high: 0.15, 0.30, and 0.45 g·L -1 respectively, in EXCR and HERB-EXCR). Results indicated that in EXCR and HERB-EXCR, water quality was better with a lower density of grass carp. In EXCR, the water quality in tanks with V. natans was worse than in other tanks, and water quality in C. demersum tanks was better under the HERB-EXCR treament. Compared to EXCR, grass carp in HERB-EXCR significantly increased concentrations of NH 4 + -N, NO 2 − -N, and chlorophyll a. The effects on biomasses of protozoa, copepods, and total zooplankton in HERB-EXCR were greater than in the other treatments. Integrated analysis showed that grass carp herbivory on submerged macrophytes could be the central mechanism accounting for the changes in water quality and zooplankton communities.

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Primary production in two shallow lakes with contrasting plant form dominance: A paradox of enrichment?

Cited by 56 publications

References 50 publications

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

A regime shift from macrophyte to phytoplankton dominance enhances carbon burial in a shallow, eutrophic lake

Combining limnology and palaeolimnology to investigate recent regime shifts in a shallow, eutrophic lake

Assessing the Effects of Grass Carp Excretion and Herbivory of Submerged Macrophytes on Water Quality and Zooplankton Communities

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