exxon valdez oil spill case study pdf

Prior to the Exxon Valdez oil spill… Course Hero is not sponsored or endorsed by any college or university. Several "variance-laws" for index data are discussed, and an extensive tabulation of data on variability of aquatic and terrestrial indices is presented. The biological availability of polynuclear aromatic hydrocarbons from lingering oil was assessed by collecting and analyzing hydrocarbons in sediments and clams from oiled and unoiled beaches. Finally, based on a systematic review of ecosystem change following disturbance, we find simplistic models of ecosystem resilience to be poorly supported by data. Discusses restoration plans mostly for wildlife, but addresses commercial fishing, recreation, tourism, and subsistence as well. However, owing to the limited space and environmental conditions, large-scale laboratory equipment cannot be utilized on ships and offline examination methods cannot meet the needs for rapid detection and analysis of problems. Consistent patterns of impact and recovery were noted for many organisms (Coats et al., 1999), but recovery trajectories in littleneck clams, Leukoma (formerly Protothaca), Thesis (Ph. Keywords In addition, the new open‐cell materials present an enhanced damping factor for low‐frequency vibrations. These multivariate methods properly account, until evidence of recovery is detected (i.e., null hypoth-, ral trends in sessile invertebrate cover at, nomic group is not as clearly defined as other taxa with, dissipates. Chemical analysis by gas chromatography/ flame ionization detector and mass spectrometry is underway at Louisiana State University. Analysis of a single dataset may include liberal use of graphics, handling of data with heterogeneous variances and below detection limits, and dealing with irregular coverage through space and time. Results weaken deterministic trophic cascade models involving sea otters and suggest that in protected coastal marine habitats, trophic linkages of sea otters, benthic prey, and associated communities may be less certain than in exposed coastal areas. At the time, The Exxon Valdez spill was the largest oil spill in the U.S.. Statistical, analysis and graphical presentations of the data suggest, intertidal epibiota communities recovered from the oil spill, by 1992 at the oiled sites and by 1994 at the oiled and re-, mediated sites. However it does not even rank in the top 50 worldwide. Exxon Valdez Oil Spill: Fate and Effects in Alaskan Waters. Polym. Here, we used imagery from a small unmanned aerial vehicle (sUAV) to test their potential use in rocky intertidal and intertidal seagrass surveys in the northern Gulf of Alaska. At 9:30 p.m. onThursday, the22nd of March, the oil tanker ExxonValdez left the oil terminal atYaldez, Alaska, Empirical data from the intertidal monitor-, ing program supports the use of tests of parallelism in, evaluating recovery and the need to avoid simply the, comparison of sample means from control and oiled, federal resource trustees that “recovery will, that can extrapolate those conditions a decade into the, Oil spill; Prince William Sound; Recovery, Environmental Management Vol. Horizontal bars illustrate various 6-year time windows used in test of parallelism and corresponding P values. The combination of microfluidic technologies and ship and marine engineering will have important theoretical significance and practical value. At oiled sites, small numbers of several species were collected; no dense aggregations were encountered. List and briefly describe three methods used to clean up the oil. The settlements surrounding the Exxon Valdez oil spill prove to be an interesting case of retributive and corrective justice in regard to damage to the ecology of the commons, particularly in light of the recent Deepwater Horizon spill in the Gulf of Mexico. The observed temporal profiles, of recovery has general application to many of the, geomorphology monitoring survey. The intertidal communities were also subjected to mechanical disturbance during invasive oil spill remediation and cleanup efforts. Altistuminen PAH-yhdisteille voi johtaa kalakantojen koon muutoksiin ja sitä kautta vaikuttaa koko Itämeren eliöyhteisöön. Title: APES CASE STUDY: THE EXXON VALDEZ OIL SPILL Author: dtelley Created Date: 4/18/2017 6:59:23 PM An essay on the principle of popula-tion, as it affects the future improvement of society with remarks on the speculations of Mr. Godwin, M. Con-dorcet, and other writers. Sea star wasting was Observer visual data always resulted in the highest taxon richness, but when observer data were aggregated to the lower taxonomic resolution obtained by the sUAV images, overall community composition was mostly similar between the two methods. You are currently offline. staminea, were different and anomalous: these clams exhibited a regularly increasing abundance at impacted sites relative to control sites over the 11-year period (Shigenaka et al., 1999). We used gene-based assays of exposure and physiological function to assess chronic oil contamination using the Pacific blue mussel, Mytilus trossulus. The 1989 Exxon Valdez oil spill damaged a wide range of natural resources, including intertidal communities, and post-spill studies demonstrated acute and chronic exposure and injury to an array of species. London, The effects of the Exxon Valdez oil spill on the Alaskan coastal environment, Appraising Variability in Population Studies. The commonly used quadrat sampling is a tested, accurate, and efficient sampling method for quantifying benthic biological communities (Heltshe andForrester, 1985, Obermeyer, 1998), and is a mainstay in monitoring programs (Delaney et al., 2008) and impact studies (Cox andFoster, 2013, Minchinton andFels, 2013). Time profiles for mean percent cover of the small acorn barnacle (Chthamalus dalli) at three control sites on the (a) arithmetic scale and (b) logarithmic scale. The settlements surrounding the Exxon Valdez oil spill prove to be an interesting case of retributive and corrective justice in regard to damage to the ecology of the commons, particularly in light of the recent Deepwater Horizon spill in the Gulf of Mexico. The commonly used quadrat sampling is a tested, accurate, and efficient sampling method for quantifying benthic biological communities (Heltshe and Forrester, 1985;Obermeyer, 1998), and is a mainstay in monitoring programs (Delaney et al., 2008;) and impact studies (Cox and Foster, 2013;Minchinton and Fels, 2013). In its ecological sense, biomonitoring refers to the recording of observations of animal or plant populations, often over space and time. In, premise of population dynamics for 200 years (Malthus, accident. blooms at the bottom of the food web because of the unusually warm conditions. Images captured by the sUAV in the high, mid and low intertidal strata on a rocky beach and within a seagrass bed were compared to data derived concurrently from observer visual surveys and to images taken by observers on the ground. Ennaltaehkäisy on varmin ja halvin keino estää suuren öljyonnettomuuden aiheuttamat vakavat seuraukset. publicly accessible. NOAA Technical Mem-, pared for NOAA Hazardous Materials Response and Assess-. Microfluidic technology, Ballast water, Lubricating oil, Oil spilling, Ships’ exhaust gas, Ship sewage, Supplementary Figures 1-7, Supplementary Tables 1-3 and Supplementary References. This poster summarizes the preliminary results for the project. During 2012-2015, we analyzed mussels from five field sites in western Prince William Sound, Alaska, with varying oil histories from the 1989 Exxon Valdez oil spill, and from three boat harbors in the area. Protothaca staminea were studied using reciprocal experimental transplants of tagged clams between unoiled and oiled sites. A statistical model where, recovery was defined as parallelism between the time pro-, files at control and oiled sites was evaluated. No evidence of spill effects was detected for either intertidal or whole-stream spawning fish. Marine mussels are a ubiquitous and crucial component of the nearshore environment, and new genomic technologies exist to quantify molecular responses of individual mussels to stimuli, including exposure to polycyclic aromatic hydrocarbons (PAHs). D.)--University of Washington, 2000 Ecology of intertidal and subtidal bivalves was studied in Prince William Sound, Alaska following the Exxon Valdez oil spill and after population reductions in sea otters (Enhydra lutris ). Prey responses to reduced otter density were asymmetrical for bivalve prey evaluated. 1, pp. Mittava öljyonnettomuus alueella voisi aiheuttaa vakavia seurauksia luonnolle yleensä ja tapauskohtaisesti luonnonvaroille sekä rannikkovaltioiden kalataloudelle. Possible relationships of otter threshold densities to various states of prey population dynamics could result in incorrect perceptions of asymmetry. Comparison of temporal profiles of the abundance (a) limpets and (b) Sitka periwinkles for parallelism at the middle intertidal transects. Time profiles for mean abundance of the bivalve Rochefortia tumida at the three control sites on the (a) arithmetic scale and (b) logarithmic scale. There are many applications for rapid on-site detection in ships and marine engineering in general. Density and size patterns were examined. Important habitat types (rocky intertidal, seagrass beds, soft-sediment Intertidal monitoring projects are often limited in their practicality because traditional methods such as visual surveys or removal of biota are often limited in the spatial extent for which data can be collected. However, monitoring showed consistent recovery of intertidal invertebrate populations in oiled areas by 2000, with recovery generally occurring within a few years post-spill. Using monitoring, data collected from 1989 to 1997, impacts and eventual, recovery were assessed at oiled but uncleaned sites and, oiled and cleaned study areas. The bases for mathematical models for various methods of population study are discussed, with particular emphasis on the situations in which indices or relative measures of abundance are used. Kachemak Bay, Alaska as part of the Gulf Watch Alaska Long-term monitoring program mortality in 2015, possibly liked to increases in disease and/or increases in harmful algal Microfluidic technologies provide an excellent platform where various biological and chemical reactions can be completed on very small microfluidic chips. Techniques for Wildlife Investigation: Design and Analysis of Capture Data. - Effective Climate Change Policies under the Liberal Democratic Paradigm, Whose and what justice? Marine intertidal organisms in Prince William, oil spill in 1989. Otter predation and differential clam settlement were probably important factors structuring subtidal bivalve communities, though habitat differences, especially for Macoma probably had some influence.Bivalve responses to significant reductions in otter density were examined to test predictions based on sea otter trophic paradigms. Our goal is to challenge conservationists to question popular conceptual models relentlessly and embrace new information, even when it challenges deeply held assumptions.

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