390 research outputs found

    A first record of Christmas Island Frigatebird Fregata andrewsi on Timor

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    THE VALUE OF SPORT FISHING IN THE SNAKE RIVER BASIN OF CENTRAL IDAHO

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    The value of sportfishing in the Snake River Basin in Central Idaho was measured using a two-stage/disequilibrium travel model. The two-stage/disequilibrium model does not require monetization of recreationists? travel time as required of traditional equilibrium labor market travel cost models. The model was estimated using Poisson regression, appropriate for count data when over-dispersion is absent, and adjusted for endogenous stratification (self selection bias) . Contrary to expectations that anglers living close to the sites with low values would be over represented in the sample, the endogenous stratification adjustment caused estimated consumers surplus to decline from 42perpersonpertripbeforeadjustmentforendogenousstratificationto42 per person per trip before adjustment for endogenous stratification to 35 after adjustment. The average number of sportfishing trips per year was 6.72, resulting in an average annual willingness-to-pay of $236 per year per angler.Resource /Energy Economics and Policy,

    ISSUES IN NONMARKET VALUATION AND POLICY APPLICATION: A RETROSPECTIVE GLANCE

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    While issues in estimating nonmarket values continue to cause concern, resource economists have more reason now than ever before to be optimistic. More progress toward improved measurement has been made in the past six years than in the previous quarter century since development of the contingent valuation and travel cost methods. The new challenge is to learn how to adjust past studies to estimate nonmarket values for future policy analysis. The process involves developing an understanding of the important variables that explain the observed difference in estimates. This paper illustrates how the results thus far could be adjusted to develop some tentative estimates of the recreation-use value of Forest Service resources.Research Methods/ Statistical Methods, Resource /Energy Economics and Policy,

    Measuring the Location Value of a Recreation Site

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    The demand for sport fishing on the Snake River reservoirs was estimated using the travel cost method. A short-run demand model was specified with location value for anglers who have the option to access a follow-on site if fishing conditions are poor. Willingness to pay for a fishing trip to the site was 18.52foranglerswhodidnothaveafollowonsiteand18.52 for anglers who did not have a follow-on site and 43.48 for anglers who did. A location value of 24.96accruedonlytoanglerswithafollowonsite.Totalannualsitevaluewasunderstatedbyasmuchas4024.96 accrued only to anglers with a follow-on site. Total annual site value was understated by as much as 40% (0.78 million) if location value for anglers with a follow-on site was excluded from the benefit estimate.contingent behavior, count data, endogenous stratification, follow-on site, location value, multiple destination, option value, short-run demand, travel cost method, Resource /Energy Economics and Policy,

    Economy of Albany, Carbon, and Sweetwater counties, Wyoming, The: description and analysis

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    Submitted to U.S. Dept. of Interior, Bureau of Land Management, Colorado State Office, Denver, Colorado.Bibliography: pages 74-76.Contract no. YA-510-PH8-57

    Economy of Albany, Carbon and Fremont counties, Wyoming, Rawlins BLM district, The

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    May 1983.Submitted to U.S. Dept. of Interior, Bureau of Land Management, Colorado State Office.Bibliography: pages 60-64.Contract no. YA-553-CT0-1077

    Direct and indirect economic effects of hunting and fishing in Colorado--1981

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    Includes bibliographical references

    Economy of Lincoln, Sublette, Sweetwater and Uinita counties, Wyoming: Rock Springs BLM district, The

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    Submitted to U.S. Dept. of Interior, Bureau of Land Management.May 1983.Contract Nos. YA-553-CT0-1077 and YA-553-CT1-1088

    The fundamental plane of evolving red nuggets

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    We present an exploration of the mass structure of a sample of 12 strongly lensed massive, compact early-type galaxies at redshifts z0.6z\sim0.6 to provide further possible evidence for their inside-out growth. We obtain new ESI/Keck spectroscopy and infer the kinematics of both lens and source galaxies, and combine these with existing photometry to construct (a) the fundamental plane (FP) of the source galaxies and (b) physical models for their dark and luminous mass structure. We find their FP to be tilted towards the virial plane relative to the local FP, and attribute this to their unusual compactness, which causes their kinematics to be totally dominated by the stellar mass as opposed to their dark matter; that their FP is nevertheless still inconsistent with the virial plane implies that both the stellar and dark structure of early-type galaxies is non-homologous. We also find the intrinsic scatter of their FP to be comparable to the local value, indicating that variations in the stellar mass structure outweight variations in the dark halo in the central regions of early-type galaxies. Finally, we show that inference on the dark halo structure -- and, in turn, the underlying physics -- is sensitive to assumptions about the stellar initial mass function (IMF), but that physically-motivated assumptions about the IMF imply haloes with sub-NFW inner density slopes, and may present further evidence for the inside-out growth of compact early-type galaxies via minor mergers and accretion.Comment: 10 pages, 3 figures, 3 tables; submitted to MNRA
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