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Author:
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Category :
Languages : en
Pages : 22
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Author:
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Category :
Languages : en
Pages : 22
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Category : Black-tailed prairie dog
Languages : en
Pages : 130
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Author:
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ISBN:
Category : Fishing
Languages : en
Pages : 24
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Author: Matthew McKinney
Publisher:
ISBN: 9781558442108
Category : Environmental policy
Languages : en
Pages : 0
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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.
Author: M.P. Weinstein
Publisher: Springer Science & Business Media
ISBN: 0792360192
Category : Nature
Languages : en
Pages : 862
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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.
Author: L. A. Reuss
Publisher:
ISBN:
Category : Land use, Rural
Languages : en
Pages : 80
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Author: David Ashley Copeland
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 348
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Category : HEC-6 (Computer program)
Languages : en
Pages : 18
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Author: A. Montanari
Publisher: Elsevier
ISBN: 0080536573
Category : Science
Languages : en
Pages : 713
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Integrated stratigraphy is essential for⧫ detailed paleoecologic studies of critical intervals in Earth history⧫ the calibration of the time scale for global use⧫ the establishment of Global Stratotype Sections and Points (GSSPs) for the definition of chronostratigraphic boundaries.This book constitutes an excellent and probably unique example of how interdisciplinary stratigraphic and geochronologic studies are approached with modern methodologies and techniques.It contains numerous unpublished, accurate radioisotopic dates of volcano-sedimentary layers interbedded in fossiliferous marine and continental Miocene sequences representing Mediterranean and Pacific environments. New, extremely detailed paleontologic data which constitute the basis for an accurate definition of the Miocene biostratigraphy, and the study of the ecologic evolution of Miocene marine environments are also included.The chapters are complimented by black-and-white photographs, graphic figures, and tables.Stratigraphers, paleontologists and sedimentologists plus geologists working in oil companies will certainly find this work of interest.
Author: United States. General Accounting Office
Publisher:
ISBN:
Category : Liquefied gases
Languages : en
Pages : 184
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