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- Title
- Mechanisms Controlling Distribution of Cosmopolitan Submerged Aquatic Vegetation: A Model Study of Ruppia maritima L. (widgeongrass) at the Everglades-Florida Bay Ecotone.
- Creator
- Strazisar, Theresa, Koch, Marguerite, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
Aquatic plants and submerged aquatic vegetation (SAV) are some of the most wide-ranging species and create important habitat for fish and wildlife in many ecosystems, including highly variable coastal ecotones. Mechanistically understanding factors controlling current distributions of these species is critical to project future distribution and abundance under increasing variability and climate change. I used a population-based approach to quantify the effects of spatial and temporal...
Show moreAquatic plants and submerged aquatic vegetation (SAV) are some of the most wide-ranging species and create important habitat for fish and wildlife in many ecosystems, including highly variable coastal ecotones. Mechanistically understanding factors controlling current distributions of these species is critical to project future distribution and abundance under increasing variability and climate change. I used a population-based approach to quantify the effects of spatial and temporal variability on life history transitions of the SAV Ruppia maritima L. (widgeongrass) in the highly dynamic Everglades-Florida Bay ecotone as a model to (1) examine which life history stages were most constrained by these conditions and (2) determine how management can promote life history development to enhance its distribution, an Everglades restoration target. Ruppia maritima life history transitions were quantified in a series of laboratory and field experiments encompassing a ra nge of abiotic and biotic factors known to affect seagrass and SAV (salinity, salinity variability, temperature, light and nutrients and seed bank recruitment and competition). These studies revealed that R. maritima life history varied east to west across the Everglades ecotone, driven by multiple gradients in abiotic factors that constrained different life history transitions in distinct ways. Based on this examination, persistence of SAV populations from dynamic coastal environments is highly dependent on large reproductive events that produce high propagule densities for recruitment. Large productive meadows of SAV also depend on high rates of clonal reproduction where vegetation completely regenerates in a short amount of time. Therefore, in hydrologically variable systems, maintenance or increases in SAV reproduction is required for population persistence through recruitment. However, SAV communities that do not experience high rates of sexual reproduction are dependent on successful seed germination, seedling and adult survival and clonal reproduction for biomass production and maintenance. Seedling survival and to a lesser extent, adult survival, are bottlenecks that can limit life history transitions under highly variable hydrological conditions. To ensure long-term survival in these communities, management activities that increase survival and successful life history development through these critical stages will be beneficial. If not, SAV populations may become highly reduced and ephemeral, providing less productive habitat.
Show less - Date Issued
- 2015
- PURL
- http://purl.flvc.org/fau/fd/FA00004549, http://purl.flvc.org/fau/fd/FA00004549
- Subject Headings
- Coastal zone management, Ruppia maritima -- Ecology -- Everglades National Park (Fla.), Ruppia maritima -- Ecology -- Florida Bay (Fla.), Seagrasses -- Everglades National Park (Fla.), Seagrasses -- Florida Bay (Fla.), Wetland ecology -- Everglades National Park (Fla.), Wetland ecology -- Florida Bay (Fla.)
- Format
- Document (PDF)
- Title
- Nixon and the environment: clean air, automobiles and reelection.
- Creator
- Escobar, Erwin Mauricio., Dorothy F. Schmidt College of Arts and Letters, Department of History
- Abstract/Description
-
the decades after World War II the United States became the most prosperous nation in the world. Yet, that prosperity and growth had a negative impact on the environmental quality of the nation. By the mid 1960s there was a rise in concern over environmental issues in the American public. Consequently, President Richard M. Nixon in his determination to give the American people what they sought decided to enact policies to bring the environmental crisis to an end. Among the environmental...
Show morethe decades after World War II the United States became the most prosperous nation in the world. Yet, that prosperity and growth had a negative impact on the environmental quality of the nation. By the mid 1960s there was a rise in concern over environmental issues in the American public. Consequently, President Richard M. Nixon in his determination to give the American people what they sought decided to enact policies to bring the environmental crisis to an end. Among the environmental policies of the Nixon Administration was the Clean Air Act of 1970, a highly controversial piece of legislation that placed tough regulations on the automobile industry. Due to the significant role of the auto industry in the American economy, and Nixon's concerns over reelection, there were two major shifts in business/government relations during this era. The first one was characterized by determination to protect the environment with little attention to complaints from the industry. The second one was about protecting the profitability of the industry while giving little attention to environmental problems.
Show less - Date Issued
- 2013
- PURL
- http://purl.flvc.org/FAU/3360764
- Subject Headings
- Political and social views, Presidents, Election, History, Air quality management, Government policy, Air, Pollution, Law and legislation, Automobile industry and trade, Environmental aspects, Transportation, Environmental aspects, Politics and government
- Format
- Document (PDF)
