نتایج جستجو برای: fishing and hunting

تعداد نتایج: 16831426  

2009
RIChARd T. CARSon MIChAEl hAnEMAnn ThoMAS C. WEggE Jeff Vaughan Richard T. Carson

This paper (and the large study behind it) was in some ways a labor of love. We set out to build a discrete choice model to predict recreational fishing behavior that would extend the literature along several dimensions. our interest in doing so stemmed from earlier work that we were individually or collectively involved in. hanemann’s dissertation (1978)1 suggested the power of the discrete ch...

2002
Chrysanthos Dellarocas

Most online feedback mechanisms publish unbiased statistics (usually averages) of past ratings. Such mechanisms fail in environments where the same seller sells products of many different qualities, such as marketplaces of used cars and collectibles. This paper presents a novel feedback management mechanism that succeeds in facilitating efficient transactions in such settings. One particularly ...

Journal: :Revista da Sociedade Brasileira de Medicina Tropical 1999
J O Lopes S H Alves C R Mari L M Brum J B Westphalen M J Altermann F B Prates

Thirty-one cases of sporotrichosis diagnosed in the central region of Rio Grande do Sul from 1988 to 1997 were studied. Clinical data were compared with a study concerning three past decades, clearly showing a decrease in the incidence of the mycosis, and an alteration in the profile of the infection, with a decrease of sporotrichosis in rural patients, children, women and farmers. In the past ...

2007
MARY L. HANSON G. W. COMSTOCK C. E. HALEY

are highly developed, there are areas which must be considered economically underdeveloped. One of the least developed regions is the Bethel area of southwestern Alaska, where approximately 11,000 persons live in some 50 villages scattered throughout a treeless tundra of 98,116 square miles. Most inhabitants are Eskimos or Atha¬ bascan Indians, whose subsistence economy is based on hunting and ...

2003
John C. Whitehead Richard Aiken

However, relatively little comparative analysis over time has been performed. Similar value elicitation formats were used in the 1991 and 1996 surveys for bass and trout fishing, deer hunting, and nonconsumptive wildlife recreation. We statistically analyze these data to assess the temporal reliability of the willingness to pay. We control for the effects of trip quality and socioeconomic varia...

2003
BRIAN ROY LOCKHART BOB KEELAND JOHN MCCOY THOMAS J. DEAN

Bottomland hardwood forests are highly productive ecosystems located along the floodplains of rivers and streams throughout the central and eastern United States (Hodges, 1994). These ecosystems provide important functions including hydrologic flux and storage, biological productivity, biogeochemical cycling and storage, decomposition and wildlife habitat (Richardson, 1994). Bottomland hardwood...

2010
Hazel K. Stiebeling

THE ABUNDANCE and variety of man's food depend upon his control over environment. For primitive tribes this meant success in hunting and fishing, and discovery and discriminating use of roots, leaves, fruit, and seeds of wild plants. Later, as animals were domesticated and agriculture got under way, control over environment came to mean good management of crops and flocks. Today for a large par...

1999

1. Patterns of World Food Consumption and Production After water, food is our most vital item of consumption. About three-quarters of the human food supply comes from agriculture (the balance being supplied by fishing, hunting and gathering). Cropland and permanent pasture cover some 37 percent of the world’s land area and a much higher proportion of the habitable land area. Food production is ...

2002
Dale J. Blahna

Introduction Utah’s wetlands provide a constellation of recreational opportunities, from sailing to photography, fishing to birdand wildlife-watching, hunting to picnicking. Even more important are the roles wetlands play in the functioning of Utah’s ecosystems. These roles include flood control, maintenance of groundwater quality and levels, pollution control, water purification, and the provi...

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