Concepts and Controversies in Tidal Marsh Ecology
M.P. Weinstein, Daniel A. Kreeger
Springer Science & Business Media, Oct 31, 2000 - Nature - 875 pages
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.
What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
abiotic abundance accretion aquatic areas bacteria benthic benthic microalgae biomass blue crabs carbon Carolina coast concentrations cordgrass cycling demissa denitrification Dennis Township density detritus diatoms dominated Ecology Progress Series ecosystem editors environment Environmental estuary export factors fish Fisheries flooding flux food webs freshwater function growth Gulf habitat heteroclitus high marsh important increased interactions invertebrates Journal juvenile Kneib Limnology Limnology and Oceanography Louisiana macrofauna Marine Ecology Marine Ecology Progress marsh creeks marsh ecosystem marsh edge marsh habitats marsh plant marsh surface microalgae microbial Minello mussels natural nekton Newell nitrogen nutrient Odum oligochaetes organic matter outwelling Phragmites phytoplankton predation primary production rates restoration River salinity salt marsh sampling sea level sediment Shelf Science shrimp soil Spartina alterniflora spatial species stable isotope structure studies subtidal sulfide Teal tidal creeks tidal marshes tide trophic Valiela variability vascular plants vegetation wetlands York Zedler zone