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f' <br />4 ? <br />Table 2. Occurrence periods for endangered and threatened species in the <br />Platte River between Overton and Grand 1'sland, Nebraska. Data <br />from Johnsgard (1980). <br />Species Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br />Bald eagle <br />Whooping crane <br />Piping plover <br />Least tern <br />species has its own habitat requirements. Habitat management <br />designed to satzsfy the needs of one of the endangered or <br />threatened species could ultimately prove detrimental to another <br />species. Development of an integrated habitat management plan <br />for the Platte River will allow for the assessment of species' <br />needs throughout the year as well as determining the most <br />appropriate actions to take to satisfy those needs. This report <br />will be part of the Joint 5tudy's integrated management pZan for <br />federally listed species. <br />4. Sntroductorv Remarks on Species ModelinQ. <br />Implementation of Habitat Suitability Index (HSI) models provide <br />species habitat information useful in impact assessment and <br />habitat.management (Bovee 1982). Species models available when <br />the.Biology Workgroup was*formed were generally inadequate to <br />describe habitats occupied by endangered and threatened species <br />on the Platte River. The principal inadequacy of each model <br />examined was the lack of specificity in addressing habitat issues <br />related to endangered species in alluvial systems such as the <br />Platte River. <br />Another important inadequacy was the lack of consensus on.those <br />existing models that addressed alluvial systems. <br />A series of workshops was organized by the Grand Island Field <br />Office of the Fish and Wildlife Service during 1986 - 1988 to <br />develop habitat suitability criteria for endangered species and <br />forage fishes that could be incorporated into HSI models. <br />Results of the modeling efforts were used in the development of