Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Book Description
Blackwater National Wildlife Refuge (N.W.R.), Final Boundary, Preliminary Assessment
Author: 2001 National Survey of Fishing, Hunting, and Wildlife-associated Recreation
Author: National Wildlife Refuge System Improvement Act of 1997
Author: Large Landscape Conservation
Author: Matthew McKinneyPublisher:
ISBN: 9781558442108
Category : Environmental policy
Languages : en
Pages : 0
Book Description
In response to increasing conservation activity at the large landscape scale, leaders from the public, private, and nongovernmental sectors participated in two national landscape management policy dialogues and many other informal discussions in 2009. Convened by the Lincoln Institute of Land Policy and the Center for Natural Resources and Environmental Policy at The University of Montana, the intent of the dialogues was to synthesize what we know about large landscape conservation and to identify the most important needs as we move forward.
Federal Rural Lands
Author: L. A. ReussPublisher:
ISBN:
Category : Land use, Rural
Languages : en
Pages : 80
Book Description
Concepts and Controversies in Tidal Marsh Ecology
Author: M.P. WeinsteinPublisher: Springer Science & Business Media
ISBN: 0792360192
Category : Nature
Languages : en
Pages : 862
Book Description
Tidal salt marshes are viewed as critical habitats for the production of fish and shellfish. As a result, considerable legislation has been promulgated to conserve and protect these habitats, and much of it is in effect today. The relatively young science of ecological engineering has also emerged, and there are now attempts to reverse centuries-old losses by encouraging sound wetland restoration practices. Today, tens of thousands of hectares of degraded or isolated coastal wetlands are being restored worldwide. Whether restored wetlands reach functional equivalency to `natural' systems is a subject of heated debate. Equally debatable is the paradigm that depicts tidal salt marshes as the `great engine' that drives much of the secondary production in coastal waters. This view was questioned in the early 1980s by investigators who noted that total carbon export, on the order of 100 to 200 g m-2 y-1 was of much lower magnitude than originally thought. These authors also recognized that some marshes were either net importers of carbon, or showed no net exchange. Thus, the notion of `outwelling' has become but a single element in an evolving view of marsh function and the link between primary and secondary production. The `revisionist' movement was launched in 1979 when stable isotopic ratios of macrophytes and animal tissues were found to be `mismatched'. Some eighteen years later, the view of marsh function is still undergoing additional modification, and we are slowly unraveling the complexities of biogeochemical cycles, nutrient exchange, and the links between primary producers and the marsh/estuary fauna. Yet, since Teal's seminal paper nearly forty years ago, we are not much closer to understanding how marshes work. If anything, we have learned that the story is far more complicated than originally thought. Despite more than four decades of intense research, we do not yet know how salt marshes function as essential habitat, nor do we know the relative contributions to secondary production, both in situ or in the open waters of the estuary. The theme of this Symposium was to review the status of salt marsh research and revisit the existing paradigm(s) for salt marsh function. Challenge questions were designed to meet the controversy head on: Do marshes support the production of marine transient species? If so, how? Are any of these species marsh obligates? How much of the production takes place in situ versus in open waters of the estuary/coastal zone? Sessions were devoted to reviews of landmark studies, or current findings that advance our knowledge of salt marsh function. A day was also devoted to ecological engineering and wetland restoration papers addressing state-of-the-art methodology and specific case histories. Several challenge papers arguing for and against our ability to restore functional salt marshes led off each session. This volume is intended to serve as a synthesis of our current understanding of the ecological role of salt marshes, and will, it is hoped, pave the way for a new generation of research.
Federal agency comments
Author: United States. General Accounting OfficePublisher:
ISBN:
Category : Liquefied gases
Languages : en
Pages : 184
Book Description
Water Associated with Coal Beds in Wyoming's Powder River Basin
Author: David Ashley CopelandPublisher:
ISBN:
Category : Science
Languages : en
Pages : 348
Book Description
HEC-6
Author: Publisher:
ISBN:
Category : HEC-6 (Computer program)
Languages : en
Pages : 18
Book Description
Estuarine Processes: Uses, stresses, and adaptation to the estuary
Author: Martin L. WileyPublisher:
ISBN:
Category : Nature
Languages : en
Pages : 568
Book Description