Responses of  a prairie wetland to press and pulse additions of inorganic nitrogen and  phosphorus: production by planktonic and benthic algae

McDougal, Rhonda L.; Goldsborough, L. Gordon; Hann, Brenda J.

doi:10.1127/archiv-hydrobiol/140/1997/145

Cited by 43 publications

(34 citation statements)

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“…Indeed, the proliferation of green algae comprising the metaphyton may be symptomatic of nutrient enrichment of the wetland, as these algae occur abundantly in nutrient-contaminated rivers (Dodds and Gudder 1992) and estuarine lagoons (Fong and Zedler 1993). Controlled enclosure experiments in Delta Marsh (McDougal et al 1997) and in wetlands nearby (Murkin et al 1994) have demonstrated that metaphyton flourishes in response to N and P enrichment.…”

Section: Effects Of Flooding On Wetland Algaementioning

confidence: 99%

Response of benthic and planktonic algal biomass to experimental water-level manipulation in a prairie lakeshore wetland

1997

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The quantitative contribution of benthic (periphytic) and planktonic algae to primary production in prairie wetlands is largely unknown, as is their response to the fluctuations in water level that characterize such systems. We measured the biomass (chlorophyll-a m -2 of wetland area) of phytoplankton, epipelon, epiphyton, and metaphyton in Delta Marsh, Manitoba as part of a five-year study in which diked, drawn down cells were reflooded to ~e normal level of the wetland, or to a depth 30 cm or 60 cm deeper. Our objective was to investigate the effects of flooding depth on algal biomass and the relative contributions by each of the four algal assemblages. Floating metaphyton mats flourished in all cells after flooding, contributing about 87% of total algal biomass. Epiphytes contributed 11% of biomass, and epipeton and phytoplankton each contributed 1%. En-iergent macrophyte density was reduced by flooding, leading to increases in open water area. The wetland cells changed gradually over the study period from an early "'open wetland'" to a "sheltered wetland." in late stages of the study, phytoplankton became more abundant as the cells proceeded to a "lake wetland" state.

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Section: Effects Of Flooding On Wetland Algaementioning

confidence: 99%

Response of benthic and planktonic algal biomass to experimental water-level manipulation in a prairie lakeshore wetland

1997

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“…These communities often efficiently retain and recycle sequestered nutrient stocks (Borchardt 1996). However, nutrient limitation to primary production by metaphyton, and periphyton in general, has been widely demonstrated in enrichment experiments utilizing both whole-system (McDougal et al 1997;Havens et al 1999;McCormick et al 2001;Rejmánková and Komárková 2005) and diffusion substrate approaches (Fairchild et al 1985;Scott et al 2005). Many of these studies demonstrated periods of N and/or P limitation, and/or periods of N + P co-limitation.…”

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confidence: 96%

The role of N2 fixation in alleviating N limitation in wetland metaphyton: enzymatic, isotopic, and elemental evidence

et al. 2007

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The role of nitrogen (N 2 ) fixation in balancing N supply to wetland metaphyton was assessed by comparing primary production with enzymatic, isotopic, and elemental correlates. Primary production, N 2 fixation (acetylene reduction, AR), phosphatase activity, C:N:P ratio, and N isotopic composition of metaphyton were measured along a nutrient gradient in a freshwater marsh during May through September 2004. N 2 fixation and phosphatase activity in metaphyton were negatively correlated with inorganic N and P concentrations, respectively. Although metaphyton N 2 fixation demonstrated a clear spatial pattern along the nutrient gradient, N 2 fixation rates varied monthly and decreased sharply in September. However, the percent contribution of N 2 fixation to N uptake by metaphyton consistently decreased throughout the summer. Furthermore, the decreased contribution of N 2 fixation to N uptake corresponded with an increase in metaphyton N content during the growing season. Nitrogen isotopic data suggested the sustained importance of an atmospheric N 2 source through September at the most downstream (nutrient poor) site even though the percent contribution of N 2 fixition to N uptake was lowest in that month. This suggests that metaphyton were efficiently accumulating and recycling fixed N 2 in support of primary production. Over the course of the summer, metaphyton primary production showed a weak inverse correlation with metaphyton phosphatase activity (r 2 = 0.58). The largest residuals in this regression corresponded to the largest vartiation in metaphyton N content. When metaphyton primary production was normalized to metaphyton N content, production rates for the entire growing season were more strongly inversely correlated with metaphyton phosphatase activity (r 2 = 0.78). Results of the study suggest that N 2 fixation in N poor areas may adequately supplement community N requirements in metaphyton, thereby causing limitation by other elemental resources such as P.

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“…Nutrients neither rarely enter an aquatic system at a constant rate during the year, nor do they show the same annual pattern over time (e.g., Soranno et al, 1996;Ostfeld & Keesing, 2000). Theoretical models (e.g., Harris, 1980), laboratory studies (e.g., Sommer, 1985;Grover, 1997;Merriman & Kirk, 2000), and a few field studies (e.g., McDougal et al, 1997;Beisner, 2001) have explored effects of nutrient variability, but these studies have focused on simple ecosystems with few species and trophic levels. It remains to be seen what the relative effects of total nutrient load versus the temporal pattern of this loading (nutrient loading rate) will be to community structure and ecosystem functioning in a more realistic and complex ecosystem.…”

Section: Introductionmentioning

confidence: 98%

The effects of variable nutrient additions on a pond mesocosm community

Butzler

Chase

2008

Hydrobiologia

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The effects of nutrient additions on aquatic systems have been frequently studied. Typically, these studies report an increase in algal biomass and a decrease in species diversity in response to nutrient increases. However, it is not clear why comparable aquatic communities respond differently to nutrient additions of similar magnitudes. We tested the effects of the rate and amount of nutrient load on community structure in 760 l mesocosms; treatments manipulated the total amount of nutrients that entered an aquatic system (small versus large load) and the temporal pattern in which these nutrients entered the system (annually, monthly, or weekly). We found that the effects of the loading rate of nutrients were at least as important as the total amount of the nutrients for several response variables. Although these effects were manifested in several ways, the response to the different rates was most prominent within groups of the primary producers, which showed large shifts in composition and abundance.

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Responses of a prairie wetland to press and pulse additions of inorganic nitrogen and phosphorus: production by planktonic and benthic algae

Cited by 43 publications

References 0 publications

Response of benthic and planktonic algal biomass to experimental water-level manipulation in a prairie lakeshore wetland

Response of benthic and planktonic algal biomass to experimental water-level manipulation in a prairie lakeshore wetland

The role of N2 fixation in alleviating N limitation in wetland metaphyton: enzymatic, isotopic, and elemental evidence

The effects of variable nutrient additions on a pond mesocosm community

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