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150325s1997 xx |||||o 00| ||eng c |
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|a (JST)4163772
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Forsman, Eric D.
|e verfasserin
|4 aut
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|a Nests of Northern Spotted Owls on the Olympic Peninsula, Washington
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|c 1997
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
|b c
|2 rdamedia
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|a Online-Ressource
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|a We located 155 nests in 82 territories occupied by Northern Spotted Owls (Strix occidentalis caurina) on the Olympic Peninsula, Washington. All nests were in trees. Of 116 nests that were measured, 105 were in cavities and 11 were in external platforms on tree limbs. Cavity nests were typically in large holes in the side of the trunk or in the broken top of the trunk. Aspect of cavity entrances was non-random, with the majority of cavities facing east-north-east. Location of nest trees did not differ from expected values for slope aspect or position on slope. Proportions of nest sites in different percent slope categories differed from availability, with more nests than expected in the higher percent slope categories. Nests usually were in stands with high overall canopy closure (≥ 70%), but canopy closure in the immediate vicinity of the nest varied from 35-90%. Most nests (87%) were in multilayered stands dominated by large trees. Nests in younger stands were typically in stands where remnant old trees were present. Owls changed nests between successive nesting events in 80% of all cases. Changes in pair members on a territory did not influence the frequency with which pairs switched to a new nest tree in the next nesting year. Based on observed rates of attrition, the expected life span of nests was 120 years.
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|a Copyright 1997 Wilson Ornithological Society
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| 650 |
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4 |
|a Behavioral sciences
|x Ethology
|x Animal behavior
|x Habitat selection
|x Animal nesting
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| 650 |
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4 |
|a Behavioral sciences
|x Leisure studies
|x Recreation
|x Sports
|x Sporting events
|x Sports tournaments
|x Olympic games
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| 650 |
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4 |
|a Biological sciences
|x Ecology
|x Animal ecology
|x Breeding sites
|x Nesting sites
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plant ecology
|x Vegetation
|x Vegetation structure
|x Plant strata
|x Vegetation canopies
|x Forest canopy
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Zoology
|x Animals
|x Birds
|x Birds of prey
|x Owls
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Dendrology
|x Trees
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| 650 |
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4 |
|a Behavioral sciences
|x Ethology
|x Animal behavior
|x Habitat selection
|x Animal nesting
|x Bird nesting
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Dendrology
|x Trees
|x Evergreen trees
|x Conifers
|x Pine trees
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| 650 |
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4 |
|a Biological sciences
|x Ecology
|x Population ecology
|x Synecology
|x Biocenosis
|x Plant communities
|x Forests
|x Coniferous forests
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Topography
|x Topographical aspect
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| 655 |
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|a research-article
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|i Enthalten in
|t The Wilson Bulletin
|d Wilson Ornithological Society, 1894
|g 109(1997), 1, Seite 28-41
|w (DE-627)388089717
|w (DE-600)2146733-X
|x 00435643
|7 nnns
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| 773 |
1 |
8 |
|g volume:109
|g year:1997
|g number:1
|g pages:28-41
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|u https://www.jstor.org/stable/4163772
|3 Volltext
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|a AR
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|d 109
|j 1997
|e 1
|h 28-41
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