Search results for: Michael J. Dagg

Items from 1 to 7 out of 7 results

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The distribution and vertical flux of fecal pellets from large zooplankton in Monterey bay and coastal California

Michael J. Dagg, George A. Jackson, David M. Checkley

Deep Sea Research Part I: Oceanographic Research Papers > 2014 > 94 > C > 72-86

We sampled zooplankton and fecal pellets in the upper 200m of Monterey Bay and nearby coastal regions in California, USA. On several occasions, we observed high concentrations of large pellets that appeared to be produced during night-time by dielly migrating euphausiids. High concentrations of pellets were found in near-surface waters only when euphausiids co-occurred with high concentrations of...

article

Temporal and Spatial Variability of Mesozooplankton in a Shallow Sub-Tropical Bay: Influence of Top-Down Control

Christopher R. Kelble, Peter B. Ortner, Gary L. Hitchcock, Michael J. Dagg, more

Estuaries and Coasts > 2010 > 33 > 3 > 723-737

Quantifying the relationship between mesozooplankton and water quality parameters identifies the factors that structure the mesozooplankton community and can be used to generate hypotheses regarding the mechanisms that control the mesozooplankton population and potentially the trophic network. To investigate this relationship, mesozooplankton and water quality data were collected in Florida Bay from...

article

Modeling the response of primary production and sedimentation to variable nitrate loading in the Mississippi River plume

Rebecca E. Green, Greg A. Breed, Michael J. Dagg, Steven E. Lohrenz

Continental Shelf Research > 2008 > 28 > 12 > 1451-1465

Increases in nitrate loading to the Mississippi River watershed during the last 50 years are considered responsible for the increase in hypoxic zone size in Louisiana-Texas shelf bottom waters. There is currently a national mandate to decrease the size of the hypoxic zone to 5000km ² by 2015, mostly by a 30% reduction in annual nitrogen discharge into the Gulf of Mexico. We developed an ecosystem...

article

The effects of vertical sampling resolution on estimates of plankton biomass and rate calculations in stratified water columns

Malinda M. Sutor, Michael J. Dagg

Estuarine, Coastal and Shelf Science > 2008 > 78 > 1 > 107-121

The effects of vertical sampling resolution on estimates of plankton biomass and grazing calculations were examined using data collected in two different areas with vertically stratified water columns. Data were collected from one site in the upwelling region off Oregon and from four sites in the Northern Gulf of Mexico, three within the Mississippi River plume and one in adjacent oceanic waters....

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In-pixel variations of chl a fluorescence in the Northern Gulf of Mexico and their implications for calibrating remotely sensed chl a and other products

Jinchun Yuan, Michael J. Dagg, Carlos E. Del Castillo

Continental Shelf Research > 2005 > 25 > 15 > 1894-1904

Remote sensing instruments such as SeaWiFS and MODIS are often calibrated or tested by comparison with in situ data. These comparisons are based on the premise that there is uniform in-pixel variation of the standard deviation of in situ properties. To evaluate some of the errors resulting from this assumption, we conducted an analysis of in-pixel variation of chl a fluorescence by examining fluorescence...

article

Biological effects of Mississippi River nitrogen on the northern gulf of Mexico-a review and synthesis

Michael J. Dagg, Greg A. Breed

Journal of Marine Systems > 2003 > 43 > 3-4 > 133-152

The Mississippi River currently delivers approximately 1.82 Tg N year ^- ¹ (1.3x10 ¹ ¹ mol N year ^- ¹ ) to the northern Gulf of Mexico. This large input dominates the biological processes of the region. The ''new'' nitrogen from the river stimulates high levels of phytoplankton production which in turn support high rates of bacterial production, protozoan and metazoan...

article

The potential contribution of fecal pellets from large copepods to the flux of biogenic silica and particulate organic carbon in the Antarctic Polar Front region near 170 ^o W

Michael J. Dagg, Juanita Urban-Rich, Jay O. Peterson

Deep-Sea Research Part II > 2003 > 50 > 3-4 > 675-691

During a spring and a summer cruise, we determined the amounts of biogenic silica (bSi) and particulate organic carbon (POC) encapsulated into fecal pellets by the community of large copepods in the Antarctic Polar Front region, in order to estimate the potential contribution of sinking pellets to bSi and POC flux from the surface layer. Grazing by large copepods can be an important mechanism for...

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Search results for: Michael J. Dagg

The distribution and vertical flux of fecal pellets from large zooplankton in Monterey bay and coastal California

Temporal and Spatial Variability of Mesozooplankton in a Shallow Sub-Tropical Bay: Influence of Top-Down Control

Modeling the response of primary production and sedimentation to variable nitrate loading in the Mississippi River plume

The effects of vertical sampling resolution on estimates of plankton biomass and rate calculations in stratified water columns

In-pixel variations of chl a fluorescence in the Northern Gulf of Mexico and their implications for calibrating remotely sensed chl a and other products

Biological effects of Mississippi River nitrogen on the northern gulf of Mexico-a review and synthesis

The potential contribution of fecal pellets from large copepods to the flux of biogenic silica and particulate organic carbon in the Antarctic Polar Front region near 170 o W

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The potential contribution of fecal pellets from large copepods to the flux of biogenic silica and particulate organic carbon in the Antarctic Polar Front region near 170 ^o W