The Structure of the Planktonic Food-Web in the St. Lawrence Great Lakes

Fahnenstiel, Gary L.; Krause, Ann E.; McCormick, Michael; Carrick, Hunter J.; Schelske, Claire L.

doi:10.1016/s0380-1330(98)70843-3

Cited by 78 publications

(69 citation statements)

References 82 publications

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“…Healey and Hendzel (1980) Table 1). Phosphorus is the most important nutrient regulating the phytoplankton growth and biomass increases, including those of cyanobacteria, in western Lake Erie (Hartig and Wallen 1984;Fahnenstiel et al 1998;Wilhelm et al 2003;c.f. ;Fitzpatrick et al 2007).…”

Section: Phytoplankton and Environmental Influencesmentioning

confidence: 99%

“…The establishment of P-reduction directives and the invasion of non-indigenous dreissenid mussels (in the early 1970s and late 1980s, respectively) led to declines in primary production and algal biomass, ultimately providing for enhanced water clarity and bottom-water oxygen (O 2 ) throughout western Lake Erie (Nicholls and Hopkins 1993;Madenjian 1995;Fahnenstiel et al 1998). Nuisance blooms were absent throughout the western basin during the early 1990s, but phytoplankton abundance increased during the mid-1990s, with summer blooms dominated by the cyanobacterium, Microcystis aeruginosa Kützing (Vanderploeg et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The instantaneous rates of phytoplankton growth and potential for biomass accumulation throughout western Lake Erie are controlled by nutrient availability, light, wind events, and grazing pressure, acting singularly or in combination (Nicholls and Hopkins 1993;Fahnenstiel et al 1998;Wilhelm et al 2003;Porta et al 2005;. However, the mechanisms underlying toxicity events are unknown.…”

Section: Introductionmentioning

confidence: 99%

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Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

et al. 2009

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Phytoplankton abundance and composition and the cyanotoxin, microcystin, were examined relative to environmental parameters in western Lake Erie during late-summer (2003)(2004)(2005). Spatially explicit distributions of phytoplankton occurred on an annual basis, with the greatest chlorophyll (Chl) a concentrations occurring in waters impacted by Maumee River inflows and in Sandusky Bay. Chlorophytes, bacillariophytes, and cyanobacteria contributed the majority of phylogenetic-group Chl a basin-wide in 2003, 2004, and 2005, respectively. Water clarity, pH, and specific conductance delineated patterns of group Chl a, signifying that water mass movements and mixing were primary determinants of phytoplankton accumulations and distributions. Water temperature, irradiance, and phosphorus availability delineated patterns of cyanobacterial biovolumes, suggesting that biotic processes (most likely, resource-based competition) controlled cyanobacterial abundance and composition. Intracellular microcystin concentrations corresponded to Microcystis abundance and environmental parameters indicative of conditions coincident with biomass accumulations. It appears that environmental parameters regulate microcystin indirectly, via control of cyanobacterial abundance and distribution.

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Section: Phytoplankton and Environmental Influencesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

et al. 2009

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“…The microbial food web (MFW) is believed to be a major contributor to the abundance of microzooplankton in Great Lakes (Gardner et al, 1986;Carrick and Fahnenstiel, 1990;Carrick et al, 1991;Valiela, 1995). This is evident from the recent observation that the heterotrophic bacteria can account for :22% of the total plankton biomass and heterotrophic protozoa (a major component of the MFW) can account for : 32% of the total heterotrophic micro-organisms in St. Lawrence Great Lakes (Fahnenstiel et al, 1998). Protozoan ciliates constituted : 30% of the zooplankton biomass in the southern part of the lake in a 1-year survey conducted from December 1986 to November 1987 (Carrick and Fahnenstiel, 1990).…”

Section: Introductionmentioning

confidence: 99%

A model study of the coupled biological and physical dynamics in Lake Michigan

Chen

Schwab

et al. 2002

Ecological Modelling

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A coupled physical and biological model was developed for Lake Michigan. The physical model was the Princeton ocean model (POM) driven directly by observed winds and net surface heat flux. The biological model was an eight-component, phosphorus-limited, lower trophic level food web model, which included phosphate and silicate for nutrients, diatoms and non-diatoms for dominant phytoplankton species, copepods and protozoa for dominant zooplankton species, bacteria and detritus. Driven by observed meteorological forcings, a 1-D modeling experiment showed a controlling of physical processes on the seasonal variation of biological variables in Lake Michigan: diatoms grew significantly in the subsurface region in early summer as stratification developed and then decayed rapidly in the surface mixed layer when silicate supplied from the deep stratified region was reduced as a result of the formation of the thermocline. The non-diatoms subsequently grew in mid and late summer under a limited-phosphate environment and then declined in the fall and winter as a result of the nutrient consumption in the upper eutrophic layer, limitation of nutrients supplied from the deep region and meteorological cooling and wind mixing. The flux estimates suggested that the microbial loop had a significant contribution in the growth of microzooplankton and hence, to the lower-trophic level food web system. The model results agreed with observations, suggesting that the

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“…For example, P stimulated bacterial growth in an oligotrophic lake, while amino acids and glucose did not (Fahnenstiel et al 1998). Chrzanowski et al (1995) found that the addition of P alone stimulated bacterial growth in 2 oligotrophic lakes.…”

Section: Nutrient Addition Experimentsmentioning

confidence: 99%

Sestonic bacterial nutrient limitation in a northern temperate river and the impact of pulp-mill effluents

Mohamed

Robarts²

2003

Aquat. Microb. Ecol.

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Bacterial growth limitation and the effect of pulp-mill effluents (PME) on sestonic bacteria were studied in a northern temperate river (the Fraser River, British Columbia, Canada). Nutrient addition experiments demonstrated that sestonic bacterial growth was potentially limited by P. Experiments were done by adding N, P, or organic carbon to 2 l microcosms of river water. The addition of P (singly, and in combination with N and C) increased bacterial production (rate of 3 H-thymidine incorporation) and activity ( 14 C-glucose uptake), while the addition of N or organic carbon did not. The inflow of PME into the Fraser River increased bacterial abundance, activity, and production in 2 ways. First, P in the PME increased native bacterial abundance and processes, and second, PME provided a source of active bacteria to the river.

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The Structure of the Planktonic Food-Web in the St. Lawrence Great Lakes

Cited by 78 publications

References 82 publications

Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

Late-summer phytoplankton in western Lake Erie (Laurentian Great Lakes): bloom distributions, toxicity, and environmental influences

A model study of the coupled biological and physical dynamics in Lake Michigan

Sestonic bacterial nutrient limitation in a northern temperate river and the impact of pulp-mill effluents

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