Posted: 2017-11-14 15:46
This project utilized metabolic incubations and high spatial resolution sampling to assess the role of internal respiration versus the advection of low oxygen water from the lower Chesapeake Bay. After confirming that internal respiration alone was capable of driving this system to hypoxia, I focused on evaluating the individual importance of various autochthonous and allochthonous organic matter sources that ultimately drive this system to hypoxia. My results indicated that management efforts focused on alleviating hypoxia should focus on reducing internal phytoplankton production, while the input of labile organic matter from the Chesapeake Bay represented an important additional source that can only be controlled by more regional efforts. The results of this project have been published in Marine Ecological Progressive Series.
This study highlighting the importance of climate change, which has the potential to complicate ongoing efforts to restore estuaries solely through nutrient load reductions. This study utilized the water quality model developed for the York River estuary to quantify the effects of climate warming on primary production, net ecosystem metabolism, and the development of hypoxia. The model predicted an increase in the duration and spatial extent of low oxygen under climate warming, and confirmed the results from the previous study that a multifaceted management strategy is required to improve conditions in the York River. However, simulations suggested that climate warming will require additional load reductions beyond those required to mitigate hypoxia in the absence of warming. The results of this project have been submitted to Estuaries and Coasts.
The Flash, increasing his supersonic speed in recent episodes, is so fast now that he’s able to streak into alternate universes. He learned about alternate universes as a “breacher,” one who crashes through a breach or portal while leaving Earth-6 for Earth-7. On Earth-7, Barry Allen as The Flash mingled with doppelgangers including the other Barry Allen, who was menaced by Killer Frost, Deathstorm and (oh, no!) himself, The Flash’s No. 6 nemesis.
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After establishing the relative importance of various organic matter sources, I then focused on the significance of both 8775 near-field 8776 and 8775 far-field 8776 nutrient and organic matter sources in relation to the development of hypoxia. While most management strategies focus solely on controlling inputs from the watersheds, I was particularly interested in evaluating the contribution of advected water entering from the Chesapeake Bay, by utilizing an intermediate-complexity model. My analysis employed a series of nutrient and organic matter loading scenarios to isolate the importance of each source to the development of hypoxia in eight regions of the estuary. After evaluating the relative contribution of each source, I evaluated the effectiveness of a range of nutrient and organic matter load reductions to determine what actions may be necessary to meet the established water quality criteria in different parts of the system. The results of this project have been submitted to Estuaries and Coasts.
Welcome to &ldquo Mentoring Mayhem,&rdquo much like speed dating in the architecture world. The event presented by the Hampton Roads Chapter of the American Institute of Architects connected Tidewater Community College students with professionals in the field for an intense exchange of ideas. Mentors shared advice on portfolios, theses, educational paths and jobs with students who hopped from professional to professional for one-on-one conversations.
My work on the DCERP project is focused on demonstrating the utility of intermediate-complexity ecosystem models by developing system-specific models for estuaries bordered by Department of Defense installations. For this project I am adapting and calibrating our ecosystem model to the Neuse River estuary in North Carolina and to the Pensacola, Escambia, and Choctawhatchee Bays in Florida. The development of these additional models, combined with our previous projects, will demonstrate the broad applicability of this approach in systems from New England to the Gulf of Mexico. Ultimately, we plan to utilize this unique approach and extensive range of ecosystems to study the potential changes within these systems due to future climate and land use changes. I will also be helping to translate these models into online decision-support tools for estuarine nutrient and carbon reductions.
This work focused on examining the importance of microphytobenthic production in Narragansett Bay. While numerous past studies have examined the role of water column primary production, there had not been an attempt to quantify benthic production occurring on the extensive shallow, photic shoals that line the upper portions of the Bay. I compared my measured metabolic rates to recent water column rates and estimated the contribution of benthic production to total primary production under current conditions and discussed the future role of microphytobenthos in the upper bay with continued oligotrophication and climate change. This analysis was also critical to establishing the importance of microphytobenthos to support future comparative and modeling analyses. The results of this project have been published in Estuarine, Coastal and Shelf Science.
During my time at VIMS I have conducted a six year running survey of microphytobenthic biomass at seven sites along the shallow, photic shoals that line the York River estuary. As a supplement to this work, I additionally conducted randomized seasonal surveys that incorporated depth profile sampling to quantify the spatial variability within the system. This long-term data set was used to constrain a recently developed mechanistic model of microphytobenthos utilizing my work in the York River estuary, along with measurements made in the New River estuary, NC and the lagoons of the Delmarva Peninsula. We are currently in the process of refining this model and will be submitting it for publication.