Linda Trocki - Profile on Academia.edu (original) (raw)

Papers by Linda Trocki

Marine ornithology, Apr 15, 2014

Black Oystercatcher Haematopus bachmani is considered vulnerable to decline owing to small global... more Black Oystercatcher Haematopus bachmani is considered vulnerable to decline owing to small global population size, low reproductive success and complete dependence on rocky intertidal shorelines that are impacted by human use and rising sea levels. In response to poor baseline knowledge of the population of the species in California, during 2011 we undertook the first targeted survey measuring distribution and abundance. For the mainland, we used a standardized protocol developed specifically for detecting Black Oystercatchers during the early breeding season, when pair fidelity to breeding territories is highest and movement is lowest. For the Channel Islands, government biologists used a standardized seabird monitoring protocol adapted to detect Black Oystercatchers. For the Farallones, data are taken from the literature. On the mainland, 164 observers participated in the survey in 12 of the state's 15 coastal counties. Observers surveyed approximately 9% of the mainland California coast, equalling approximately 18% of the state's mainland suitable habitat, defined below. A total of 1 160 Black Oystercatchers were detected in this subset of habitat, more than the previous estimate for the entire state (<1 000 individuals). Average density of individuals in mainland surveyed areas was 3.14 birds/km; 135 nests were positively identified, and average nest density was 0.4 nests/km surveyed. On the Northern Channel Islands, approximately 20% the total coastline (66 km), and 20% of the suitable habitat (58 km) of San Miguel, Santa Rosa, Santa Cruz, Anacapa and Santa Barbara islands was surveyed. A total of 176 adult or sub-adult Black Oystercatchers were detected. Average density of individuals in surveyed areas was 2.7 individuals/km, comparable to mainland densities. In areas thoroughly surveyed, observers found densities of nesting territories comparable with those in Alaska and British Columbia, considered the core of the species' range. Based on observed densities in surveyed areas, and including estimates from the literature and more recent observations of a population of 60 at the Farallones, we conservatively estimate a total mainland and Farallones population between 3 971 and 5 213 and a Northern Channel Islands population between 779 and 854, for a total statewide population between 4 749 and 6 067. Our results indicate that California is a critical rather than peripheral part of the Black Oystercatcher range. This result, plus ongoing threats, emphasizes the need to monitor Black Oystercatcher population trends and to identify and protect the most important habitats for Black Oystercatchers in California. The Black Oystercatcher appears highly amenable to citizen science monitoring, particularly at smaller spatial scales, owing to its life history characteristics and charismatic appeal to the public.

a.Direct Capital Costs

This paper outlines a methodology that is being applied to assess the cost-effectiveness of new e... more This paper outlines a methodology that is being applied to assess the cost-effectiveness of new environmental technologies under development by the Office of Technology Development, Office of Environmental Management in the US. Department of Energy. Performance, total system effects, life-cycle costs, uncertainty, and environmental risk are all considered in the methodology to compare new technologies with existing or base-line technologies. An example of performance characterization is given in the paper. Sources of data for cost estimates and technology characterizations also appear in the paper. 1The authors gratefully aclmowledge the suppon provided for this work from the U.S. DepIIment of Energy under Technical Task Plan AL 2202-R.

The IAEA has collected a large body of information on uranium geology on a global scale. Its data... more The IAEA has collected a large body of information on uranium geology on a global scale. Its data gathering and disseminating activities include: administration of technical assistance projects in developing countries, publication, in co-operation with the OECD's Nuclear Energy Agency, of 'Uranium Resources, Production and Demand', sponsorship of symposia on uranium resources and development, and participation in the International Uranium Resources Evaluation Project.

This report was prepared as an account of work sponsored by an agency of the United States Govern... more This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi-bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refer-ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom-mendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

Ages of major uranium mineralization and lead loss in the Key Lake uranium deposit, northern Saskatchewan, Canada

Uranium and lead isotope ratios were measured on nine ore samples and four mineral separates from... more Uranium and lead isotope ratios were measured on nine ore samples and four mineral separates from the Deilmann orebody of the Key Lake uranium-nickel deposit. The time of primary mineralization is the oldest reported for Proterozoic unconformityrelated uranium deposits in the Athabasca basin. Data obtained in this study show that lead loss (or uranium gain) has occurred in highgrade rocks and that lead gain (or uranium loss) has occurred in low-grade rocks. Lead loss rather than uranium gain in high-grade ore is suggested by the petrologic work of Cumming and Rimsaite and the presence of excess radiogenic lead in the overlying sandstone documented by Curtis and Gancarz. Some of the results obtained in this study provide evidence of preferential movement of /sup 238/U intermediate daughters out of uranium minerals and into the matrix.

Marine Ornithology, Apr 1, 2014

Benefit-cost assessment programs: Costa Rica case study

An assessment of mineral potential, in terms of types and numbers of deposits, approximate locati... more An assessment of mineral potential, in terms of types and numbers of deposits, approximate location and associated tonnage and grades, is a valuable input to a nation's economic planning and mineral policy development. This study provides a methodology for applying benefit-cost analysis to mineral resource assessment programs, both to determine the cost effectiveness of resource assessments and to ascertain future

An Economic Prefeasibility Study of Geothermal Energy Development at Platanares, Honduras

Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, 1995

Portions of this document may be illegible in electronic image products. Images are produced from... more Portions of this document may be illegible in electronic image products. Images are produced from the best available original document. Edited by Wilmer Bunker, Group A 4 This work was supported by the U.S. Agency for International Development. An Affirmative Action/Equal Opportunity Employer This report was prepared as an account of m k sponsored by an agency ofthe United States Government. Neither the United States Government nor any agenry thereof, nor any of their employa?~, makes any warranty, express or implid, or assumes any legal liability or respomi3ilityfOr the accuracy, completeness, or Uspfitlness ofany information, apparatus, product, or process disclosed, or represents that its use rwuld not infringe '-privately oumed rights. Reference herein to any specific commercial product, process, or m * c e by trade name, trademark, manufncturer, or otherrctise, does not necasan7y constitute or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or r+t those ofthe United States Government or any agency thereof. , ..

Resources and Energy, Feb 1, 1990

The development histories of approximately 200 each iron and copper mine openings in the non-cent... more The development histories of approximately 200 each iron and copper mine openings in the non-centrally-planned-economies from the mid-1800s through the mid-1980s are analyzed to determine the role of exploration in mineral supply. The research shows that approximately 75 percent of the iron mines and 50 percent of the copper mines opened since World War II do not result from the prompt development of new discoveries. The mine openings result from the reevaluation of mineralization or orebodies that are previously recognized, which become economic under changed technologic or market conditions. Although the incentive for exploration is normally the expectation that high-profit deposits exist to be found, the supply of new mines does not depend critically on whether such high-profit deposits are discovered. Studies that predict scarcity of resources arising from the failure of exploration to uncover new, highprofit deposits thus do not adequately explain the mineral supply process.