日本水産工学会誌
Online ISSN : 2189-7131
Print ISSN : 0916-7617
ISSN-L : 0916-7617
合衆国における生息地の線引と評価の展開
Ellis. J. CLAIRAIN, Jr.
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ジャーナル オープンアクセス

1996 年 33 巻 1 号 p. 19-23

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Numerous attempts have been made during the last four decades to develop techniques to delineate and assess the diverse habitats located throughout the United States. Delineation is a precursor to assessment and both are necessary prior to effective habitat management. Initial efforts to delineate habitats in the United States focused on application of classification techniques. Some classification efforts delineated all habitat types in the United States and displayed those boundaries on national maps whereas other classification efforts focused on particular habitat types such as wetlands. One technique incorporated vegetative, soil, and hydrologic characteristics to more precisely define habitat boundaries and satisfy the need for detailed boundary definition to regulate dredged and fill activities in wetland ecosystems. These classification and delineation techniques provided valuable tools to facilitate early attempts to assess habitat quality. Habitat assessment techniques also evolved to meet different geographic and technical requirements. Numerous techniques have been developed since the mid-1970s to assess a variety of habitats. The Habitat Evaluation Procedures developed by the U. S. Fish and Wildlife Service provides a national approach to wetland and non-wetland habitat assessment. Two other techniques, the Wetland Evaluation Technique and the Hydrogeomorphic Approach to Assessment of Wetland Functions, also provide assessment approaches which examined a wide range of wetland functions at both the national and local levels. The objective of this paper is to provide an overview of the evolution of habitat delineation and assessment in the United States with an emphasis on delineation and assessment of wetland habitats

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© 1996 日本水産工学会
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