The pigeon guillemot (Cepphus columba) population in Prince William Sound has failed to recover from declines that occurred both before and after the Exxon Valdez Oil Spill (EVOS). Post-spill studies of pigeon guillemot breeding biology have identified three potential factors limiting recovery: (1) predation on eggs and nestlings; (2) declines in the proportion of high-lipid, schooling forage fish (sand lance [Ammodytes hexapterus], herring [Clupea pallasi], and capelin [Mallotus villosus]) in the diet; and (3) continued exposure to residual oil from the spill. This laboratory study with captive-reared pigeon guillemots at the Alaska SeaLife Center investigated two aspects of the species' biology that are relevant to restoration in the aftermath of EVOS. First, we investigated the role of dietary factors (prey type, quantity of food consumed, dietary fat content, and energy intake rate) in limiting the growth, development, survival, and fledging condition of nestling pigeon guillemots. The objective was to understand how changes in prey availability and prey quality might affect pigeon guillemot productivity. Second, we fed nestlings sublethal doses of weathered Prudhoe Bay crude oil (PBCO) and then measured several potential biomarkers of effects from this pollutant. These dose-response experiments were designed to (1) better understand the impact on nestling guillemots of petroleum hydrocarbons in food, (2) calibrate existing and potential biomarkers of exposure to PBCO in pigeon guillemots in a controlled, laboratory setting, and (3) develop better nondestructive biomarkers of exposure to PBCO in pigeon guillemots in particular, and seabirds in general. Results of feeding experiments indicated that most variation in nestling growth rates could be explained by variation in daily energy intake. The type of forage fish consumed, the lipid or protein content of the forage fish, and even the quantity of food consumed daily did not have as strong an effect on nestling guillemot growth as did daily energy intake. The metabolic efficiency and growth performance of nestling guillemots was not enhanced on high-lipid diets, contrary to results with nestlings of some other seabird species. Instead, structural growth (wing length) in nestling guillemots was somewhat stunted on high-lipid diets. These attributes of guillemot nutritional requirements are associated with the guillemots' nearshore foraging niche and high food provisioning rates to nestlings. The average lipid content of sand lance, juvenile herring, and capelin may represent the optimal dietary lipid content for nestling pigeon guillemots. This study supports the hypothesis that guillemot productivity is limited by the availability of these forage fishes through effects on energy provisioning rates to nestling guillemots. Consequently, recovery of pigeon guillemot populations injured by EVOS is likely linked to recovery of these key forage fish stocks. Results of the oil-dosing experiments indicated that nestling guillemots are resistant to small doses of weathered PBCO in their food. No nestlings died or suffered noticeable health effects following dosing. The high dose in this study (0.5 ml kg����� day�����) was sufficient to induce hepatic cytochrome P450A1 (a liver enzyme indicative of contaminant exposure), but growth rate, fledging mass, and blood chemistry were largely unaffected. None of the 12 plasma or hematological markers examined responded in a dose-dependent manner to ingestion of weathered PBCO, except lactate dehydrogenase (LDH). Although baseline stress hormone (corticosterone) levels were not different between oil-dosed and control nestlings, a standardized acute stress protocol revealed that corticosterone was more elevated during stress for oiled nestlings compared to controls. Although we were not successful in identifying a noninvasive biomarker (e.g., growth) or a blood biomarker (e.g., haptoglobin) of crude oil exposure in nestlings, we were able to confirm that levels of hepatic cytochrome P4SO1AI and corticosterone during stress were elevated by the sublethal doses administered during our experiments. Based on this and other studies, it is unlikely that the failure of pigeon guillemots to recover from EVOS is due to effects on nestling health of residual oil in food. / Graduation date: 2003

No description available.

The 2010 Deepwater Horizon (DWH) oil spill resulted in a large release of polycyclic aromatic hydrocarbons (PAH) into the Gulf of Mexico. PAH can interact with ultraviolet radiation (UV) resulting in increased toxicity, particularly to early lifestage organisms. The goal of this research was to determine the sensitivity of fiddler crab larvae (Uca longisignalis) to photo-induced toxicity following exposure to Deepwater Horizon spill oil in support of the DWH Natural Resource Damage Assessment. Five replicate dishes each containing 20 larvae, were exposed to one of three UV treatments (10%, 50%, and 100% ambient natural sunlight) and one of five dilutions of water accommodated fractions of two naturally weathered source oils. A dose dependent effect of PAH and UV on larval mortality was observed. Mortality was markedly higher in PAH treatments that included co-exposure to more intense UV light. PAH treatments under low intensity sunlight had relatively high survival. These data demonstrate the importance of considering combined effects of non-chemical (i.e. UV exposure) and chemical stressors and the potential for photo-induced effects after exposure to PAH following the Deepwater Horizon spill.

No description available.

The following research is a content analysis of 114 articles written by the American and British news media outlets in the first month following the BP Gulf oil spill in April 2010. The goal of the research was to identify any dominant frames evident in the reports and to compare the two countries to see if there was a difference in the dominant frames used. Positive, negative, and neutral tones were also evaluated to determine if there was a difference between the countries. The results show that both countries reports predominantly used an ecology and action frame, while British media outlets also used an economic frame. Both countries reported with primarily a negative and neutral tone. The implications of these findings for crisis communication managers are discussed.

Crude oil is of economic importance to any nation. However its poor management and disposal method has resulted in oil spillage and ground contamination. Most emphasis on crude oil contamination on the environment has been on surface and ground water pollution, as well as plants and animals with little or no attention paid to the engineering properties of the contaminated soil. This research is thus aimed at investigating the effect of light crude oil contamination on the geotechnical properties of kaolinite clay soil. This research is a laboratory based experiment in which the contaminated soil was prepared by adding different percentages of light crude oil (2%, 5%, 8%, 10%, 15% and 20%) measured by weight of the dry soil sample and mixed until a uniform mixture was obtained. The British Standard Test Methods for Civil Engineering purposes BS 1377: 1990 (EUROCODE 7: EN 1997: 2-5) was adopted with few modifications. The calculations were based on the fact that the pore space in the contaminated soil is occupied by water and crude oil so water content was calculated from the fluid content and the rate of evaporation of crude oil during oven drying was also considered. The classification results showed that crude oil contamination caused an increase in linear shrinkage, liquid limit, plastic limit and plasticity index between 0% to 20% contaminations. The compaction result showed that there was an increase in maximum dry density while the optimum moisture content decreased between 0% and 15% of crude oil contamination. The result showed that the soil could not compact at 20% contamination and above. Also, the coefficient of permeability increased with increase in the percentage of crude oil contamination while the coefficient of consolidation value (Cv) increases with increase in the percentage of contamination. There was a decrease in the cohesion value and the frictional angle due to the introduction of the crude oil into the soil. Although crude oil altered the geotechnical properties of the kaolinite clay soil and reduced its strength, the soil can still be used for geotechnical purposed after remediation.

The marine ecosystems are fundamental for human welfare. A number of current environmental pressures need attention, and the formulation of management strategies requires information from a variety of analytical dimensions. The linkage between environmental change and resulting implications for human welfare is one such dimension. This thesis presents studies on welfare implications from hypothetical future policies which improve the state of the marine environment. The method for these studies is economic valuation. The studied scenarios concern eutrophication in the Baltic Sea (including the Kattegat) and oil spill risk from shipping in the Lofoten-Vesterålen area in the Arctic Barents Sea. The thesis shows that the economic benefits from undertaking policies to improve or protect the marine environment in these cases are substantial and exceed the costs of taking measures. In addition to providing new monetary estimates, the thesis also provides new insights concerning 1) what type of scenario to use when valuing an environmental improvement and 2) whether there may exist trade-offs between precision in estimates and the level of ambition with respect to survey instrument complexity and econometric models when conducting valuation studies. The findings suggest an end of an era for studies in which the environmental change is unspecified or based on a single environmental indicator while the actual consequences of the suggested measures are more multifaceted. In contrast, relevant scenarios to study are well-specified and holistic. The thesis further reveals that it might not always be worth the effort to go for the most advanced scenario presentation or statistically best-fitting model specifications. This is something that needs to be further discussed among practitioners in order to allocate valuation resources wisely and not waste resources on unnecessarily elegant valuation studies. / <p>QC 20161011</p>

Orientador: Gilbero José Garcia / Banca: Paulina Setti Riedel / Banca: Décio Semensatto Junior / Obra em 2 volumes, sendo o volume 2: Mapeamento de sensibilidade ambiental a derramamento de óleo na região costeira de Bertioga - SP : atlas / Resumo: O presente trabalho realizou o mapeamento de Sensibilidade Ambiental a derramamentos de óleo da região costeira do município de Bertioga-SP. Foram mapeados os ambientes do estuário do Canal de Bertioga e do Rio Itapanhau, além da área costeira marinha compreendida entre a foz do Canal de Bertioga e a Ponta do Itaguá, na praia da Boracéia, em São Sebastião. Para tanto, foi aplicada a metodologia indicada pelo Ministério do Meio Ambiente, atualmente utilizada no Brasil. Foram mapeados e identificados em campo e na literatura três tipos de informações principais: recursos biológicos; caracterização física do meio e usos humanos dos espaços e recursos (atividades sócio-econômicas). Como produto final, os ecossistemas costeiros e marinhos presentes na linha de costa foram classificados de acordo com o índice de sensibilidade ambiental. Foi desenvolvido um banco de dados geográfico e elaborado um Atlas da região contendo as cartas de sensibilidade ambiental (Cartas SAO), sendo 03 de nível tático (1:70.000) e 11 de nível operacional (1:20.000), informações descritivas dos segmentos da linha de costa, com recursos visuais, além de uma listagem de espécies. A região costeira de Bertioga apresentou significativa heterogeneidade ambiental, em sua maior parte representados por manguezal, com alta sensibilidade ao óleo, localizada em áreas do estuário. Estes ambientes apresentam baixo hidrodinamismo, sedimentos lamosos inconsolidados, de baixa declividade, abrigando grande diversidade de fauna, resultando em grande persistência do óleo no ambiente e dificultando as ações de combate. O ambiente praial demonstrou baixa variação morfodinâmica (ângulo de declividade e granulometria) sazonal, e conseqüentemente, não houve variação sazonal na classificação no índice de sensibilidade ambiental (ISL). Foi possível identificar uma lacuna na literatura científica... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This present study performed the environmental sensitivity mapping for oil spills of the coast side of Bertioga City. It has been mapped the estuary of Bertioga's Channel and Itapanhau River, besides the marine coast side between the Bertioga's Channel mouth and Ponta do Itaguá, at Boracéia beach, at São Sebastião City. To perform the present study it was applied the methodology indicated by the Ministry of the Environment, currently used in Brazil. It has been mapped and identified in field and literature three types of main information: biological resources, physical environment characterization and human land use and resources (socio-economic activities). As a final product it was developed a geographic database and an atlas of the surroundings containing ESI maps, including 03 tactical (1:70.000) and 11 operational maps (1:10.000), which show coast line descriptive information, visual resources and a list of biological species. The seashore of Bertioga City presents significant environmental diversity, the most part represented by mangrove ecosystem, with high sensitivity to oil, located at estuary. These environments present low hydrodynamism, mud sediment, low declivity, sheltering biodiversity, resulting in high oil persistence in environment difficulting actions to combat. The beach environment showed low seasonal morfodynamic variation, consequently, there was no seasonal variation at environmental sensitivity index. It was possible to identify a blank at scientific literature about biodiversity information for the studied area, despite being an exuberant environment. The study area has potential sources of pollution, as OSBAT pipeline and state highways. The building of a geographic database, directed to detailded ESI maps associated with an environmental atlas, showed to be an instrument for to guide actions in oil spills sceneries, while they are instruments... (Complete abstract click electronic access below) / Mestre

Crude oil causes both lethal and sublethal effects on marine organisms, but the impact upon sensory function remains unexplored. Elasmobranchs rely upon the effective functioning of their sensory systems for use in feeding, mating, and predator avoidance. The objective of this study was to test the effect of crude oil upon the olfactory and electroreceptive sensitivity of the Atlantic stingray, Dasyatis sabina. The magnitudes of the electro-olfactogram (EOG) responses were significantly depressed by 26% (Glutamic Acid) to 157% (Cysteine) for all amino acids when stingrays were exposed to crude oil. The shapes of the EOG responses when exposed to oil were also significantly different, exhibiting a more protracted response compared to un-exposed stingrays. Oil exposed stingrays exhibited a significant decrease in orientation distance to prey-simulating electric fields. This study is the first to quantify the effects of crude oil on olfactory and electrosensory sensitivity of marine predators. / Includes bibliography. / Thesis (M.S.)--Florida Atlantic University, 2016. / FAU Electronic Theses and Dissertations Collection

O Canal de São Sebastião, localizado na costa norte de São Paulo, na região dos municípios de Ilhabela e São Sebastião, é uma das mais importantes zonas costeiras do Estado de São Paulo, em termos de biodiversidade. O Terminal Marítimo Almirante Barroso ? Dutos e Terminais do Centro-Sul (TEBAR/ DTCS) da PETROBRAS está localizado nesta região, na qual ocorreram 151 vazamentos de óleo ligados ao transporte marítimo entre 1978 e 2002. O monitoramento dos costões rochosos do Canal de São Sebastião foi criado pela CETESB para levantar dados de base sobre as comunidades de costões entremarés visando subsidiar futuras avaliações dos impactos de vazamentos de óleo na região. Foram monitorados 17 costões durante quatro anos, entre 1993 e 1996. Constatou-se a presença de 287 táxons (macrofauna e macroalgas), com marcante variação na composição de espécies entre os costões. A estrutura taxonômica de grandes grupos e trófica, no entanto, mantiveram-se relativamente homogêneas entre os pontos. Apesar de haver algumas diferenças locais, o padrão geral de zonação foi similar entre os costões, variando principalmente a largura dos estratos e a composição das espécies acompanhantes. As variações quantitativas das espécies dominantes foram intensas entre os pontos e reduzidas sazonalmente. Os parâmetros ambientais identificados como mais significativos no controle da estrutura da comunidade foram hidrodinamismo, declive, e quantidade de refúgios na rocha. Foram constatadas preferências diferenciadas pelas espécies dominantes por combinações ambientais específicas. / The São Sebastião Channel, located at the north coast of São Paulo State, between the cities of Ilhabela and São Sebastião, is one of the most important coastal zones of the State regarding biodiversity. The Almirante Barroso maritime terminal TEBAR/DTCS is located at this area, where 151 oil spills occurred over the last 25 years. The São Sebastião Channel rocky shore monitoring program was created in order to generate background data about the intertidal community and to support future evaluations of ecological impacts from oil spills. Seventeen sites were monitored during four years (1993-1996). This program registered 287 taxa (macrofauna and macroalgae), and great variation on the species composition among the sites. However, the taxonomic and trophic structure was very similar. Despite the occurrence of individual differences, such as belts width and the composition of the less dominant species, the general pattern of vertical zonation was similar among sites. The quantitative variations of the dominant taxa were intense among the different rocky shores but small seasonally. The environmental variables identified as the most important to the community structure were the hydrodynamics, slope and rock heterogeneities (refuges). The existence of an ecological gradient reflecting the environmental preferences of the dominant species was clearly indicated in this study.