Search results for: Peter J. Lavrentyev

Items from 1 to 8 out of 8 results

article

Diatom‐produced allelochemicals trigger trophic cascades in the planktonic food web

Gayantonia Franzè, James J. Pierson, Diane K. Stoecker, Peter J. Lavrentyev

Limnology and Oceanography > 63 > 3 > 1093 - 1108

Diatoms produce a series of cytotoxic secondary metabolites such as polyunsaturated aldehydes (PUA) in response to cell injury or stress. However, little information exists on the PUA effects on the pelagic food web. A set of experiments was conducted in the Chesapeake Bay and the coastal Atlantic waters using dissolved PUA (2E,4E‐octadienal and 2E,4E‐heptadienal), natural assemblages of phytoplankton...

article

Patterns of microzooplankton growth in dilution experiments across a trophic gradient: Implications for herbivory studies

Matthew R. First, Peter J. Lavrentyev, Frank J. Jochem

Marine Biology > 2007 > 151 > 5 > 1929-1940

To investigate the growth and grazing patterns of microzooplankton (MZP) in environments of differing productivity, dilution experiments measuring phytoplankton growth (μ) and grazing mortality (m) rates were performed using samples from contrasting locations along the Texas coast. Samples were collected from estuaries, coastal lagoons and offshore Gulf of Mexico locations in the spring and summer...

article

Effects of Hydrological Flow Regime on Sediment-water Interface and Water Column Nitrogen Dynamics in a Great Lakes Coastal Wetland (Old Woman Creek, Lake Erie)

Mark J. McCarthy, Wayne S. Gardner, Peter J. Lavrentyev, Kenneth M. Moats, more

Journal of Great Lakes Research > 2007 > 33 > 1 > 219-231

Sediment-water interface nitrogen (N) transformations and water column ammonium cycling rates were measured along a stream to lake gradient at three sites within Old Woman Creek (OWC) and one near-shore Lake Erie site during two hydrological regimes: one with open flow to the lake after a rain event (July 2003), and another with a sand barrier blocking flow (July 2004). Net N2 effluxes in OWC at all...

article

Nitrogen dynamics and microbial food web structure during a summer cyanobacterial bloom in a subtropical, shallow, well-mixed, eutrophic lake (Lake Taihu, China)

Mark J. McCarthy, Peter J. Lavrentyev, Longyuan Yang, Lu Zhang, more

Hydrobiologia > 2007 > 581 > 1 > 195-207

Nitrogen dynamics and microbial food web structure were characterized in subtropical, eutrophic, large (2,338 km²), shallow (1.9 m mean depth), and polymictic Lake Taihu (China) in Sept–Oct 2002 during a cyanobacterial bloom. Population growth and industrialization are factors in trophic status deterioration in Lake Taihu. Sites for investigation were selected along a transect from the Liangxihe River...

article

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

Changsheng Chen, Rubao Ji, David J. Schwab, Dmitry Beletsky, more

Ecological Modelling > 2002 > 152 > 2-3 > 145 - 168

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,...

article

Particle Transport, Nutrient Cycling, and Algal Community Structure Associated with a Major Winter-Spring Sediment Resuspension Event in Southern Lake Michigan

Brian J. Eadie, David J. Schwab, Thomas H. Johengen, Peter J. Lavrentyev, more

Journal of Great Lakes Research > 2002 > 28 > 3 > 324-337

Over the past decade, intermittent satellite imagery revealed the presence of an extensive plume of resuspended sediments in late winter-early spring with a clear offshore projection coinciding with the region of maximum sediment accumulation in the lake. The large scale of the plume implied that this process was important in sediment, and associated constituent, cycling and transport, but it had...

article

Nitrogen Dynamics in Sandy Freshwater Sediments (Saginaw Bay, Lake Huron)

Wayne S. Gardner, Longyuan Yang, James B. Cotner, Thomas H. Johengen, more

Journal of Great Lakes Research > 2001 > 27 > 1 > 84-97

Sediment-water nitrogen fluxes and transformations were examined at two sites in Saginaw Bay, Lake Huron, as a model for sandy freshwater sediments. Substantial ammonium release rates (74 to 350 μmole NH ₄ ⁺ /m ² /h ¹ ) were observed in flow-through cores and in situ benthic chamber experiments. Sediment-water ammonium fluxes were similar at the inner and outer bay stations...

article

Effects of the Zebra Mussel (Dreissena polymorpha Pallas) on Protozoa and Phytoplankton from Saginaw Bay, Lake Huron

Peter J. Lavrentyev, Wayne S. Gardner, Joann F. Cavaletto, John R. Beaver

Journal of Great Lakes Research > 1995 > 21 > 4 > 545-557

Direct effects of the grazing activities of the zebra mussel, Dreissena polymorpha, on the natural assemblage of planktonic protozoa and algae from Saginaw Bay, Lake Huron, were studied in September and October 1994. Water and mussels collected from two eutrophic sites were incubated in an outdoor “natural light” incubator at ambient temperature for 24 hours. Experiments were conducted in 4-L bottles...

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Keywords

DENITRIFICATION (3)
LAKE MICHIGAN (2)
PHYTOPLANKTON GROWTH (2)
ZEBRA MUSSELS (2)
AMMONIUM FLUX (1)
COUPLED BIOLOGICAL AND PHYSICAL MODEL (1)
CYANOBACTERIAL BLOOMS (1)
DIATOMS (1)
DINOFLAGELLATE (1)
DNRA (1)
ECOSYSTEM (1)
EPISODIC EVENTS (1)
EUTROPHICATION (1)
FLUXES (1)
GRAZING IMPACT (1)
GRAZING RATE (1)
HETEROTROPHS (1)
LAKE ERIE (1)
LAKE HURON (1)
LAKE TAIHU (1)
MICROBIAL PROCESSES (1)
NITRIFICATION (1)
NITROGEN (1)
OLD WOMAN CREEK (1)
PHYTOPLANKTON (1)
PHYTOPLANKTON POPULATIONS (1)
PROTOZOA (1)
REGENERATION (1)
SAGINAW BAY (1)
SEDIMENT RESUSPENSION (1)
SEDIMENT-WATER EXCHANGE (1)
SEDIMENT-WATER NITROGEN DYNAMICS (1)
SEDIMENTS (1)
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Elsevier (5)
Springer (2)
Wiley (1)

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Search results for: Peter J. Lavrentyev

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