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Author : United States. Congress. House. Committee on Resources. Subcommittee on National Parks, Forests, and Lands
Publisher : Unknown
Page : 210 pages
File Size : 43,5 Mb
Release : 1995
Category : Nature
ISBN : PSU:000024719865
Author : Anonim
Publisher : Unknown
Page : 44 pages
File Size : 42,7 Mb
Release : 1991
Category : Birds
ISBN : MINN:31951D00749430K
Author : Anonim
Publisher : Unknown
Page : 684 pages
File Size : 53,8 Mb
Release : 1991
Category : Birds
ISBN : MINN:31951D007494295
Author : Bruce G. Marcot
Publisher : Unknown
Page : 40 pages
File Size : 44,5 Mb
Release : 1997
Category : Forest management
ISBN : MINN:31951D028890834
Author : United States. Congress. House. Committee on Resources. Subcommittee on National Parks, Forests, and Lands
Publisher : Unknown
Page : 208 pages
File Size : 44,7 Mb
Release : 1995
Category : Nature
ISBN : UCR:31210013728413
Author : Anonim
Publisher : Unknown
Page : 564 pages
File Size : 53,7 Mb
Release : 1992
Category : Electronic
ISBN : NWU:35556030832018
Author : Anonim
Publisher : Unknown
Page : 458 pages
File Size : 54,5 Mb
Release : 1992
Category : Electronic
ISBN : NWU:35556030831952
Author : Anonim
Publisher : Unknown
Page : 148 pages
File Size : 46,9 Mb
Release : 1992
Category : Spotted owl
ISBN : IND:30000037501016
Author : Anonim
Publisher : Unknown
Page : 758 pages
File Size : 50,9 Mb
Release : 2001
Category : Forest ecology
ISBN : STANFORD:36105110542250
Author : Anonim
Publisher : Unknown
Page : 318 pages
File Size : 43,6 Mb
Release : 1997
Category : Endangered plants
ISBN : MINN:31951P009599053
Author : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of the Interior and Related Agencies
Publisher : Unknown
Page : 1094 pages
File Size : 52,6 Mb
Release : 1992
Category : United States
ISBN : STANFORD:36105119518491
Author : Joseph L. Ganey
Publisher : Unknown
Page : 26 pages
File Size : 41,5 Mb
Release : 2005
Category : Great horned owl
ISBN : MINN:31951D02492715E
We estimated diet composition of sympatric Mexican spotted (Strix occidentalis lucida, n = 7 pairs of owls) and great horned owls (Bubo virginianus, n = 4 pairs) in ponderosa pine (Pinus ponderosa) - Gambel oak (Quercus gambelii) forest, northern Arizona. Both species preyed on mammals, birds, and insects; great horned owls also ate lizards. Mammals dominated the diet of both species. Mammals comprised 63 and 62% of all prey items identified in diets of spotted and great horned owls, respectively, and 94 and 95% of prey biomass. Both species primarily preyed on a few groups of small mammals. Observed overlap in diet composition between species (0.95) was greater than expected based on null models of diet overlap, and the size range of prey taken overlapped entirely. Mean prey mass was similar for both species (great horned owl, 47.0 ± 7.4 g [SE], n = 94 items; spotted owl, 40.1 ± 1.8 g, n = 1,125 items). Great horned owls consumed larger proportions of diurnally active prey than spotted owls, which primarily consumed nocturnally active mammals. Our results, coupled with a previous analysis showing that these owls foraged in the same general areas (Ganey and others 1997), suggests that they could compete for food resources, which are assumed to be limiting in at least some years. They may minimize the potential for resource competition, however, by concentrating foraging activities in different habitats (Ganey and others 1997) and by foraging at different times, when different suites of prey species are active.
Author : Andy Miller,Western Canada Wilderness Committee
Publisher : Spotlight Poets
Page : 62 pages
File Size : 54,5 Mb
Release : 2004
Category : Northern spotted owl
ISBN : CORNELL:31924089446433
Author : Anonim
Publisher : Unknown
Page : 14 pages
File Size : 54,5 Mb
Release : 1998
Category : Forests and forestry
ISBN : MINN:31951D02960092H
Author : Anonim
Publisher : Unknown
Page : 628 pages
File Size : 41,9 Mb
Release : 1994
Category : Forest management
ISBN : STANFORD:36105017791505