A 10-Year Study of Shoreline Conditions in the Exxon Valdez Spill Zone, Prince William Sound, Alaska

2001 ◽  
Vol 2001 (1) ◽  
pp. 559-567 ◽  
Author(s):  
Edward S. Gilfillan ◽  
David S. Page ◽  
Keith R. Parker ◽  
Jerry M. Neff ◽  
Paul D. Boehm
Keyword(s):  
Oil Spill ◽  
Individual Species ◽  
Prince William Sound ◽  
Exxon Valdez ◽  
Worst Case ◽  
Intertidal Community ◽  
Infaunal Community ◽  
Long Term Study ◽  
Natural Factors

ABSTRACT A shoreline ecology program was performed in Prince William Sound (PWS), Alaska in 1990 and 1991 (1 and 2 years after the Exxon Valdez oil spill, EVOS) to assess the fate and effects of the oil in the intertidal zone. Major components of the study were repeated in 1998 and 1999. This update included a sediment-sampling program at formerly oiled “worst-case” boulder/cobble (B/C) sites and randomly chosen unoiled B/C reference sites. The samples were analyzed for petroleum hydrocarbons and benthic infaunal community characteristics. This paper focuses on the results of the benthic infaunal community analysis. Analysis of Covariance (ANCOVA) was used to analyze the 1990–1999 infaunal species composition data. Very little effect of oiling was detected in either the analysis of community structure parameters or in individual species abundances. Oiling effects were detected at some sites in 1990 and 1991, but not in 1998 and 1999. Nearly all the change in intertidal community parameters between 1990 and 1999 was attributed to natural interannual variation. The composition of the intertidal community of B/C shores changed over time because of natural factors not related to the spill. A core group of species was found in each of the 4 years. This group of species represented between 9 to 30% of all species identified. Two other groups of species did not co-occur. One group was present in 1990 and 1991, but not in 1998 and 1999; the other group was present in 1998 and 1999, but not in 1990 and 1991. The progressive change in the animal community observed between 1990 and 1999 is very likely related to long-term climatic changes occurring in the study area and not the oil spill. This long-term study demonstrates the importance of study designs that allow separation of oiling effects from natural factors that can affect biological communities.

scholarly journals The Role of Petroleum Geochemistry in Defining Oil Spill Recovery: Examples from the Exxon Valdez Spill in Prince William Sound, Alaska

2003 ◽  
Vol 2003 (1) ◽  
pp. 291-298
Author(s):  
David S. Page ◽  
A. Edward Bence ◽  
William A. Burns ◽  
Paul D. Boehm ◽  
John S. Brown
Keyword(s):  
Oil Spill ◽  
Marine Environment ◽  
Sediment Quality ◽  
Quality Data ◽  
Prince William Sound ◽  
Exxon Valdez ◽  
Worst Case ◽  
Exxon Valdez Oil Spill ◽  
Infaunal Community ◽  
Petroleum Geochemistry

ABSTRACT The application of petroleum geochemistry to determining the fate and effects of oil spills in the marine environment requires high quality data to allow source identification through fingerprinting methods and unbiased sampling designs that allow valid comparisons to be made to detect spill related effects in the presence of other sources of environmental stress. This is particularly important in long-term studies, where sources of hydrocarbons and other pollutants unrelated to the spill event and non-spill related environmental effects become far more important in defining the environmental status of the spill zone. In studies of the Exxon Valdez oil spill, petroleum geochemistry is used to identify the many sources contributing polycyclic aromatic hydrocarbons (PAH) to the marine environment of Prince William Sound (PWS), including the Exxon Valdez oil spill, oil seep residues, particulates from eroding organic shales and coal formations, forest fire fallout, recent biogenic inputs and past human and industrial activities. A sediment quality triad-based shoreline ecology program (SEP), begun in 1990, includes a random sampling component and worst-case non-random site component that provides chemistry data through 2001 to determine the fate and bioavailability of spill oil residues on the shorelines. Environmental half-life values for the PAH at oiled sites range from 2.0 – 7.4 months for upper intertidal areas. Analysis of mussel tissue samples collected at worst-case spill locations find PAH concentrations in the same range as reference site samples. The results of concurrent sediment toxicity measurements using standard bioassays defines a dose-response relationship for total PAH concentration (TPAH) having a threshold of effect TPAH of 2,600 ng/g (dry wt.) that agrees well with the onset of sublethal ecological stress as defined by reductions in infaunal community structure parameters.

1998 Shoreline Conditions in the Exxon Valdez Oil Spill Zone in Prince William Sound

1999 ◽  
Vol 1999 (1) ◽  
pp. 119-126 ◽  
Author(s):  
David S. Page ◽  
Edward S. Gilfillan ◽  
Sam W. Stoker ◽  
Jerry M. Neff ◽  
Paul D. Boehm ◽  
...  
Keyword(s):  
Oil Spill ◽  
Petroleum Hydrocarbons ◽  
Sediment Toxicity ◽  
Prince William Sound ◽  
Exxon Valdez ◽  
Tidal Zone ◽  
Worst Case ◽  
Polycyclic Aromatic ◽  
Random Manner ◽  
Ecology Program

ABSTRACT After the March 24, 1989 grounding of the Exxon Valdez and the release of 258,000 barrels of Alaska North Slope (ANS) crude oil into the marine environment of Prince William Sound (PWS), Alaska, a number of scientific studies were conducted from 1989 to 1998 to assess the fate and effects of the spill. These included the 1990–1991 shoreline ecology program (SEP), which detected little measurable impact of the spill, except at certain heavily oiled sites. In 1998, these 1990 and 1991 studies were updated. The 1998 study found spill small remnants from originally heavily oiled sites represent a minute fraction of the total PWS shoreline area. Any isolated deposits of remaining oil residues from the spill generally were found at the top of the tidal zone and highly weathered and therefore in a form and location unavailable and non-toxic to biota. Between 1991 and 1998, the concentrations of petroleum hydrocarbons at the “worst case” sites studied decreased dramatically. The polycyclic aromatic hydrocarbon (PAH) concentrations measured at these sites in 1998 were at least three times lower than the effects range-low (ER-L) sediment toxicity threshold values of 4,022 ng/g for total PAH. Mussels sampled at heavily oiled “worst case” sites in 1998 also had dramatically lower tissue PAH concentrations compared with samples taken in 1993, indicating low bioavailability of any hydrocarbons present and thus low risk to biota. Natural interannual variability in the structure of the biological infaunal communities is the largest, most consistent signal observed in this study, not any residual oil spill effects. The results of statistical analyses of the data (ANCOVA) indicated no continuing oiling effects in 1998. Consistent differences were observed between oiled and unoiled reference sites, but they were significant in only one analysis. These differences were unrelated to differences in the total PAH present among sites. Any observed differences are more likely related to the fact these “worst case” oiled sites were not selected in an unbiased, random manner.

scholarly journals Nine Years After the Exxon Valdez Oil Spill: Effects on Marine Bird Populations in Prince William Sound, Alaska

The Condor ◽  
2000 ◽  
Vol 102 (4) ◽  
pp. 723-737 ◽  
Author(s):  
David B. Irons ◽  
Steven J. Kendall ◽  
Wallace P. Erickson ◽  
Lyman L. McDonald ◽  
Brian K. Lance
Keyword(s):  
Oil Spill ◽  
Bird Species ◽  
Population Level ◽  
Prince William Sound ◽  
Negative Effects ◽  
Exxon Valdez ◽  
Marine Bird ◽  
Marine Birds ◽  
Exxon Valdez Oil Spill ◽  
Positive Effects

Abstract We compared post Exxon Valdez oil-spill densities of marine birds in Prince William Sound from 1989–1991, 1993, 1996, and 1998 to pre-spill densities from 1984–1985. Post-spill densities of several species of marine birds were lower than expected in the oiled area of Prince William Sound when compared to densities in the unoiled area. These negative effects continued through 1998 for five taxa: cormorants, goldeneyes, mergansers, Pigeon Guillemot (Cepphus columba), and murres. Black Oystercatchers (Haematopus bachmani) and Harlequin Ducks (Histrionicus histrionicus) exhibited negative effects in 1990 and 1991. Loons showed a weak negative effect in 1993. Black-legged Kittiwakes (Rissa tridactyla) showed relative decreases in 1989, 1996, and 1998 which may have been caused by shifts in foraging distribution rather than declines in populations. Glaucous-winged Gulls (Larus glaucescens) showed positive effects in most post-spill years. Murrelets and terns showed relative increases in 1993, 1996, and 1998. Generally, taxa that dive for their food were negatively affected, whereas taxa that feed at the surface were not. Effects for some taxa were dependent upon the spatial scale at which they were analyzed. Movements of birds and the mosaic pattern of oiling reduced our ability to detect oil-spill effects, therefore our results may be conservative. Several marine bird species were negatively affected at the population level and have not recovered to pre-spill levels nine years after the oil spill. The reason for lack of recovery may be related to persistent oil remaining in the environment and reduced forage fish abundance.

Comparative Toxicities of Polar and Non-Polar Organic Fractions From Sediments Affected By the Exxon Valdez Oil Spill in Prince William Sound, Alaska

1995 ◽  
Vol 10 (1-2) ◽  
pp. 137-156 ◽  
Author(s):  
Douglas A. Wolfe ◽  
K. John Scott ◽  
John R. Clayton ◽  
John Lunz ◽  
James R. Payne ◽  
...  
Keyword(s):  
Oil Spill ◽  
Prince William Sound ◽  
Exxon Valdez ◽  
Exxon Valdez Oil Spill ◽  
Organic Fractions

Long-Term Ecosystem Response to the Exxon Valdez Oil Spill

Science ◽  
2003 ◽  
Vol 302 (5653) ◽  
pp. 2082-2086 ◽  
Author(s):  
C. H. Peterson
Keyword(s):  
Oil Spill ◽  
Ecosystem Response ◽  
Exxon Valdez ◽  
Exxon Valdez Oil Spill

Review of Studies on Oil Damage To Prince William Sound Pink Salmon

2001 ◽  
Vol 2001 (1) ◽  
pp. 569-575
Author(s):  
Ernest Brannon ◽  
Keya Collins ◽  
Lawrence Moulton ◽  
Keith R. Parker
Keyword(s):  
Oil Spill ◽  
Pink Salmon ◽  
Sampling Procedure ◽  
Prince William Sound ◽  
Measurable Effect ◽  
Exxon Valdez Oil Spill ◽  
Differences Of Opinion ◽  
History Of ◽  
Oil Exposure

ABSTRACT In the tenth year following the Exxon Valdez oil spill, differences of opinion still exist about injuries to pink salmon. It was alleged that exposure to oil reduced growth of fry and induced mortality in eggs. The authors reexamined the allegation that injury occurred and have concluded that insufficient consideration was given to other factors that affected results in the studies from which these allegations were drawn. The inability to track temperature differences and the unknown ages of fry precluded assessment of oil effects on growth during early marine residence. Reported higher egg mortality and long-term injury alleged to have resulted from oil exposure during incubation were confounded by the mortality of eggs that occurred as an artifact of the sampling procedure, unrelated to oil effects. The authors concluded that injury to incubating pink salmon embryos and reduced fry growth were based on an incomplete assessment of other factors that influenced these results. This evidence is supported by other research that has disclosed no oil effects on incubating eggs. Among these were studies that showed measured oil concentrations reaching the incubation substrate were 14 to 7,600 times below the lethal threshold. The seven largest runs in the history of Prince William Sound (PWS), Alaska have returned in the 10 years following the spill, which ultimately demonstrated the lack of measurable effect of the oil spill on pink salmon. The authors suggest that the allegation of oil-induced injury to PWS pink salmon needs to be reconsidered in light of these analyses.

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