Recent changes in primary production and phytoplankton in the offshore region of southeastern Lake Michigan

Fahnenstiel, Gary L.; Pothoven, Steven A.; Vanderploeg, Henry A.; Klarer, David M.; Nalepa, Thomas F.; Scavia, Donald

doi:10.1016/j.jglr.2010.03.009

Cited by 172 publications

(207 citation statements)

References 47 publications

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“…As previously described, DCMs have been reported for each of the Laurentian Great Lakes (Barbiero and Tuchman 2001), although whether they represent elevated primary production across the Great Lakes and throughout the duration of their existence, remains equivocal. The most detailed studies come from Lake Michigan, where DCMs demonstrably occur in conjunction with deep primary production maxima (Moll et al 1984;Fahnenstiel and Scavia 1987). From Lake Ontario, Barbiero and Tuchman (2001) reported that phytoplankton biomass measured at the DCM was not significantly greater than the phytoplankton biomass measured from an integrated water sample taken above the DCM.…”

Section: Methodsmentioning

confidence: 99%

A deep chlorophyll maximum nourishes benthic filter feeders in the coastal zone of a large clear lake

Malkin¹,

Silsbe²,

Smith³

et al. 2012

Limnology & Oceanography

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Water column profiles demonstrated that a deep chlorophyll maximum (DCM) in the littoral zone of Lake Ontario intersected the benthos during the development of stratification. We hypothesized that elevated food supply near the lake bottom may be nourishing littoral-zone benthic suspension feeders during this time. Chlorophyll fluorescence was monitored at three heights above the lake bottom, together with near-bottom water velocity using down-facing acoustic Doppler current profilers (ADCPs), at three coastal stations along a crossshore transect. Concurrently, growth rates of quagga mussels (Dreissena bugensis) caged at the lake bottom were compared with mussels suspended 2 m above the bottom. Over a 3-month period beginning April, caged lakebottom mussels grew rapidly (mean biomass-specific growth rate 5 1.08 yr 21 ), while over a 3-month period beginning July, bottom mussels experienced a decrease in biomass (20.74 yr 21 ). Suspended mussels always grew significantly faster than bottom mussels (2.3 and 2.2 yr 21 in Apr and Jul experiments, respectively), affirming previously predicted growth inhibition on the lake bottom due to seston depletion. The different growth rate between seasons of the caged-bottom mussels was most likely attributable to differences in near-bottom chlorophyll concentrations. There was significantly higher chlorophyll a concentration near the lake bottom during the April experiment (average of two stations closest to shore 5 2.7 mg L 21 ) relative to the July experiment (0.21 mg L 21 at the same stations). We suggest that littoral-zone quagga mussels are nourished during the onset of stratification via development of a DCM.

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Section: Methodsmentioning

confidence: 99%

A deep chlorophyll maximum nourishes benthic filter feeders in the coastal zone of a large clear lake

Malkin¹,

Silsbe²,

Smith³

et al. 2012

Limnology & Oceanography

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“…Primary productivity in Lake Michigan is now similar to oligotrophic Lake Superior (Evans et al, 2011). The phytoplankton community of southern Lake Michigan is reduced and its composition has changed dramatically, especially during early spring mixing (Fahnenstiel et al, 2010). All major phytoplankton groups have declined in abundance with the exception of cyanobacteria and chlorophytes, which affects the broader food-web of the lake and carbon flux through it.…”

Section: Purposementioning

confidence: 99%

“…The Straits of Mackinac provide a major waterway between Lake Michigan and Lake Huron, a hydrological connection that equilibrates lake levels and combines the two basins to form the largest freshwater lake, by surface area, in the world. Much remains to be revealed about the composition of the microbial community in these important freshwater systems (Keough et al, 2003; and about how ongoing ecosystem changes (Scavia et al, 2014), especially those caused by dreissenid mussels in the Lake Michigan basin, affect lake planktonic microbial communities and food web structure Evans et al, 2011;Fahnenstiel et al, 2010;Turschak et al, 2014). In low-productivity lakes, such as Lake Michigan, autotrophic and heterotrophic bacteria play key roles in ecosystem metabolism (Fahnenstiel and Scavia, 1987;).…”

Section: Introductionmentioning

confidence: 99%

From land to lake: Contrasting microbial processes across a Great Lakes gradient of organic carbon and inorganic nutrient inventories

Dila

Biddanda

2015

Journal of Great Lakes Research

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“…Methods for measuring and collecting Chl and TP are described by Fahnenstiel et al (2010) and Mida et al (2010), and much of the data presented here are reported by them from a much longer time series; however, it was necessary to recast some of their data and include others not reported by them to create a data set appropriate for evaluating interannual patterns in zooplankton species found in different strata of the water column and dominant in different seasons. They were concerned primarily with the spring isothermal conditions and summer epilimnetic conditions.…”

Section: Temperature Total Phosphorus and Chlorophyll Trendsmentioning

confidence: 99%

Seasonal zooplankton dynamics in Lake Michigan: Disentangling impacts of resource limitation, ecosystem engineering, and predation during a critical ecosystem transition

Vanderploeg

Pothoven

Fahnenstiel

et al. 2012

Journal of Great Lakes Research

100

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Fahnenstiel, Gary L.; Cavaletto, Joann F.; Liebig, James R.; Stow, Craig A.; Nalepa, Thomas F.; Madenjian, Charles P.; and Bunnell, David B., "Seasonal zooplankton dynamics in Lake Michigan: Disentangling impacts of resource limitation, ecosystem engineering, and predation during a critical ecosystem transition" (2012 We examined seasonal dynamics of zooplankton at an offshore station in Lake Michigan from 1994 to 2003 and 2007 to 2008. This period saw variable weather, declines in planktivorous fish abundance, the introduction and expansion of dreissenid mussels, and a slow decline in total phosphorus concentrations. After the major expansion of mussels into deep water (2007)(2008), chlorophyll in spring declined sharply, Secchi depth increased markedly in all seasons, and planktivorous fish biomass declined to record-low levels. Overlaying these dramatic ecosystem-level changes, the zooplankton community exhibited complex seasonal dynamics between 1994-2003 and 2007-2008. Phenology of the zooplankton maximum was affected by onset of thermal stratification, but there was no other discernable effect due to temperature. Interannual variability in zooplankton biomass during 1994 and 2003 was strongly driven by planktivorous fish abundance, particularly age-0 and age-1 alewives. In 2007-2008, there were large decreases in Diacyclops thomasi and Daphnia mendotae possibly caused by food limitation as well as increased predation and indirect negative effects from increases in Bythotrephes longimanus abundance and in foraging efficiency associated with increased light penetration. The Bythotrephes increase was likely driven in part by decreased predation from yearling and older alewife. While there was a major decrease in epilimnetic-metalimnetic herbivorous cladocerans in 2007-2008, there was an increase in large omnivorous and predacious calanoid copepods, especially those in the hypolimnion. Thus, changes to the zooplankton community are the result of cascading, synergistic interactions, including a shift from vertebrate to invertebrate planktivory and mussel ecosystem impacts on light climate and chlorophyll.

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Recent changes in primary production and phytoplankton in the offshore region of southeastern Lake Michigan

Cited by 172 publications

References 47 publications

A deep chlorophyll maximum nourishes benthic filter feeders in the coastal zone of a large clear lake

A deep chlorophyll maximum nourishes benthic filter feeders in the coastal zone of a large clear lake

From land to lake: Contrasting microbial processes across a Great Lakes gradient of organic carbon and inorganic nutrient inventories

Seasonal zooplankton dynamics in Lake Michigan: Disentangling impacts of resource limitation, ecosystem engineering, and predation during a critical ecosystem transition

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