Charles L. Gallegos

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Submersed aquatic vegetation (SAV) is an important component of shallow water estuarine systems that has declined drastically in recent decades. SAV has particularly high light requirements, and losses of SAV have, in many cases, been attributed to increased light attenuation in the water column, frequently due to coastal eutrophication. The desire to(More)
We developed an algorithm for calculating habitat suitability for seagrasses and related submerged aquatic vegetation (SAV) at coastal sites where monitoring data are available for five water quality variables that govern light availability at the leaf surface. We developed independent estimates of the minimum light required for SAV survival both as a(More)
Spectral diffuse attenuation coefficients were measured in the Rhode River and Chesapeake Bay, Maryland, on 28 occasions in 1988 and 1989. The model of Kirk was used to extract scattering and absorption coefficients from the measurements in waters considerably more turbid than those in which the model was previously applied. Estimated scattering(More)
Ecosystem engineers are species that alter the physical environment in ways that create new habitat or change the suitability of existing habitats for themselves or other organisms. In marine systems, much of the focus has been on species such as corals, oysters, and macrophytes that add physical structure to the environment, but organisms ranging from(More)
We measured inherent and apparent optical properties and computed 'optical closure' in four lakes on the South Island of New Zealand, ranging very widely in reflectance. Optical properties were measured by modern instruments deployed from boats, with supporting laboratory measurements on water samples. The radiative transfer model, Hydrolight, was used with(More)
This cabinet-level council is the principal means for the President to coordinate science, space , and technology policies across the federal government. The NSTC acts as a " virtual " agency for science and technology to coordinate the diverse parts of the federal research and development enterprise. The NSTC is chaired by the President. Membership(More)
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