Publications

In 1992, the Chesapeake Bay had 28,591 hectares of SAV, compared to 25,623 hectares in 1991, with 2,516 hectares (8.7%), 13,713 hectares (48.9%) and 12,362 hectares (434.2$) occurring in the Upper, Middle, and Lower Bayzones, respectively (Fig 1,2,and 3). SAV increased in most sections in 1992 with the largest increases in SAV abundance occurring in the Eastern Bay and Choptank River sections. SAV declined in only a few sections, notably the Upper Potomac River section.

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In 1992, the Chesapeake Bay had 28,591 hectares of SAV, compared to 25,623 hectares in 1991, with 2,516 hectares (8.7%), 13,713 hectares (448.9%), and 12,362 hectares (43.2%) occurring in the Upper, Middle and Lower Bay zones, respectively (Fig1, 2, and 3). SAV increased in most sections in 1992 with the largest increases in SAV abundance occurring in the Eastern Bay and Choptank River sections. SAV declined in only a few sections, notably the Upper Potomac River section.

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The tidal Potomac River and Estuary are complex environments inhabited by a variety of plants and animals. These living resources are greatly influenced by dynamic physical and chemical processes which modify their habitat. They, in turn, modify chemical and physical processes and change the habitat. Plants form the link in the food chain between the nutrients in the water column and the sediment and the animals-fish, invertebrates, birds, herptiles and mammals. Hydrologists study submersed plants not only as indicators of water quality and health of aquatic ecosystem but also to understand the interrelation between plants and other ecosystem components.

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In 1996, the Chesapeake Bay Program signatories opened 55.8 miles to migratory fish within the Bay watershed. A total of 267.1 miles have been opened to date, including 148.7 miles opened prior to the Directive. In addition to 1996 and prior year results, this report also discusses fish passage projects currently n the planning, design, or construction phases for 1997 and future years. These projects will contribute to reaching Bay Program goals.

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Scientific knowledge is not static. The scientific community is continually advancing its understanding of fundamental principles or processes that will eventually have impact on decision of societal importance. This publication reviews five areas of estuarine reserch that we believe have critical importance to the protection and restoration of the Chesapeake Bay. The particular areas were selected because of their broad implication beyond the immediate disciplines in which the studies are conducted.

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Scientific knowledge is not static. The scientific community is continually advancing its understanding of fundamental principles or processes that will eventually have impact on decision of societal importance. This publication reviews five areas of estuarine research that we believe have critical importance to the protection and restoration of the Chesapeake Bay. The particular areas were selected because of their broad implications beyong the immediate disciplines in which the studies are conducted.

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Long, rapidly sampled time series measurements of dissolved oxygen, temperature, salinity, currents, winds, tides and isolation were collected during the summer of 1987 across mesohaline Chesapeake Bay. Anaalyses of the data show that short term variability of dissolved oxygen was both large and spatially heterogeneous. Time scales of variability ranted from longest period fluctuations resolved (several day) to the sampling interval (several minutes). Advectove varoabo;otu pf dossp;ved oxygen is implicated as an important characteristic of the majority of summertime benthic environments in the mesohaline Chesapeake Bay and lower reaches of adjoining tributaries.

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This two-day workshop was structured to address each of the topic areas in a one-half day session, with the last session of the workshop set aside to debelop a final list of reserach priorities. Each half day session was composed of two activities: presentation and a work session. In addition to the subject-specific sessions, the workshop participants also generated a list of wetlands research priorities. The priority list was generated using a Delphi process, whichthrough interative rounds of input from individuals, produces a group consensus.

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Ecologically valuable species are defined in the Strategy as those species or groups of species that have significant functions in the ecosystem by: 1)regulating populations of other species (prey and predators); 2)regulating the quantity and quality of habitat for other species (e.g., oysters and submerged aquatic vegetation); 3)processing large amounts of material (nutrients, organic and inorganic matter) by both physical and chemical means (phytoplankton, bacteria, filters feeders); or 4)producing organic matter (phytoplankton, SAV, plants of marshes and shorelines).

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