Much is known about the spatial and temporal distribution of macro-organisms and their activity rates. However, little is known about the spatial variability of microbial communities in lakes. In this study, we examined the spatial variability in both bacterial community composition and activity rates in Toolik Lake, Alaska. Community composition was characterized using denaturing gradient gel electrophoresis (DGGE) of PCR-amplified rDNA, and activity rates were measured by uptake rates of 14C-leucine.

As demonstrated in many studies, mostly in rural settings, successful resource management requires collaboration among many groups. This is likely to be even more pronounced in densely settled urban areas. Cities generally consist of many fragmented land parcels under different types of use and ownership, which produces a large and diverse group of stakeholders with an interest in resource management decisions.

The Luquillo Forest Dynamics Plot (LFDP) is a 16-ha long-term study plot in subtropical wet forest in the Luquillo Mountains of Puerto Rico. It is part of the Luquillo LTER and the Center for Tropical Science (CTFS) network of large tropical forest plots. Forests are often subject to multiple, compounded disturbances, representing both natural and human-induced processes. Our goal is to understand forest structure, diversity and dynamics, and to predict long-term changes resulting from interactions of past human land use and intermittent hurricane damage.

 Striped bass (Morone saxatilis) are a top predator that make annual migrations along the Atlantic coast to forage. Striped bass have rebounded from low numbers in the early 1980s and are now seasonally abundant in many New England estuaries. For these reasons, PIE LTER may provide critical foraging habitat for striped bass. In addition, striped bass could potentially alter trophic structures in estuarine environments.

     Coastal watersheds provide valuable ecosystem goods and services to society. Both anthropogenic and natural changes may alter the ability of natural systems to provide these goods and services. To maintain resilient ecosystems in the face of future change, we need to understand their structure and how they function. One indicator of ecosystem function is species diversity. Substantial evidence exists to suggest that more diverse systems can be more resilient to ecosystem alterations.

Impact of Agricultural Practices on Bacterial Carbon Use Efficiency
Z. M. Lee and T. M. Schmidt
Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI

The exchange of water between coral reef lagoons and the open ocean depends on the interplay between waves, buoyancy, wind stress, and alongshore currents. Some processes act to retain lagoon water such as onshore flows driven by surface waves, while others (e.g., the momentum jet that exits the lagoon) export lagoon water. To explore the impact of surface waves on the exchange dynamics, observations were made in Paopao Bay, French Polynesia, a nearly tideless coral reef lagoon system.

Coral reefs are known for their exceptional species diversity and productivity, yet are sensitive to biotic and abiotic perturbations. Many reefs have experienced phase shifts as the result of alterations in herbivore abundance. This research in Moorea, French Polynesia, is aimed at elucidating differential effects of sea urchin species on the coral reef community.

The marine microbial community, consisting of autotrophic and heterotrophic bacteria and protists (< 200 µm), is challenging to study due to its high diversity, various trophic functions, and poorly resolved taxonomy. However, the inherent property of organism size, determined by microscopical and flow cytometric techniques, can be used to develop population and community size spectra, which summarize large amounts of information into a simplified format.

Environmental justice research seeks to understand the patterns and processes shaping the distribution of environmental burdens and amenities across society. While environmental justice research in the US has generally focused on toxics, urban design, hazard management, and segregation have reshaped patterns of risk associated with environmental processes, such as flooding, and the social patterns of exposure to those risks. In Baltimore, flood risks have been a major impetus behind the engineering of the hydrologic systems of the city.