Jerome J Pella

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Fisheries that exploit mixed stocks are very common, and their management oftentimes requires assessment of composition of the mixed catches (Begg et al., 1999). Multilocus genotypes of fi sh are a natural tag by which to infer their origins. The unknown proportions from stocks comprising a stock mixture, or its stock composition, can be estimated from(More)
We estimated the amount of oil remaining in Prince William Sound, Alaska, 12 yr after the 1989 Exxon Valdez spill to assess its importance as a long-term reservoir of toxic hydrocarbons. We found oil on 78 of 91 beaches randomly selected according to their oiling history. Surface oiling was recorded for randomly placed quadrats, which were then excavated(More)
Oil stranded by the 1989 Exxon Valdez spill has persisted in subsurface sediments of exposed shores for 16 years. With annualized loss rates declining from approximately 68% yr(-1) prior to 1992 to approximately 4% yr(-1) after 2001, weathering processes are retarded in both sediments and residual emulsified oil ("oil mousse"), and retention of toxic(More)
The National Marine Fisheries Service's Alaska Fisheries Science Center uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series reflect sound professional work and may be referenced in the formal(More)
We monitored the efficacy of a cleaning method applied to 8-year-old spill oil from the Exxon Valdez that remained on armored portions of beaches in Prince William Sound, Alaska. Removal of oil was attempted in summer 1997 by high-pressure injection of PES-51* into 10,000 m of beach used historically for subsistence food-gathering. Cleaning efficacy was(More)
We describe a new method and a computer program SALMONN b to calculate the effective number of breeders ( N b ) per year in semelparous species with variable age at maturity. The existing temporal method for the ‘salmon’ life history produces an estimate of the harmonic mean N b in the two sampled years. SALMONN b reads genotypic data in standard formats(More)
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