Download or read book An Analysis of a Population of Snowshoe Hares Lepus Americanus Washingtonii Baird in Western Oregon written by Hugh C. Black and published by . This book was released on 1965 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ecology of a population of snowshoe hares, Lepus americanus washingtonii, was studied in western Oregon from 1960 to 1962. Objectives were to obtain information to control hares, which frequently cause damage to coniferous reproduction in the region, and to compare the life history of this little-studied subspecies with others. The study area was located on cut-over forest land at 2900-foot elevation in the western Cascades. The climate is characterized by heavy precipitation in winter and summer drought. Snowfall is slight. Sixty-four live-traps were located in a square grid of 8 rows of 8 traps each, at spacings of approximately 100 and 200 feet. Half the traps were located on a recently clear-cut area and half in young-growth western hemlock and Douglas-fir. Traps usually were set for three successive days at monthly intervals. Trapped hares were marked and released on the main study area, and hares from nearby areas were removed for necropsy. In all, 207 hares were caught 889 times on the trapping grid during the 18-month study. One-third of hares tagged and released were not recaught, but the remainder were recaught one or more times. Trapping success varied from 3.6 to 44.4 percent. Principle factors influencing movements of hares, trapping success, and distribution of catches were vegetative structure, weather, and differing behavior of adults. Estimates of numbers of hares were computed from live-trapping data by the recapture, and the calendar-graph methods. Both methods indicated comparable trends in the population. Estimates of hares on the area trapped ranged from 41 in March to 136 in August. Estimated density of hares was 1.6 per acre at start of trapping in October. Density was nearly doubled to about 3.0 hares per acre in late summer. Most adult females on the area studied had two or three litters a year, averaging three young per litter. First litters were born in May and last litters in August. Most juveniles approached maximum size by four months. Mean total length of adults of both sexes was greater than that of subadults. Foot and total length of adult females were greater than in adult males. Mean weight of adult males in winter was 40.6 ounces and of females, 43.4 ounces. Subadults and adults weighed slightly less in early winter than in late fall. Sex ratio of 205 adult and juvenile hares was 80 females to 100 males; ratio of 84 young juveniles tagged during the summer was 87 females to 100 males. Juveniles tagged (154) exceeded adults tagged (51) by a ratio of 3:1. Weighted mean range-size of adult hares caught three or more times as computed by the inclusive-boundary-strip, and circular-bivariant-distribution methods was 5.76 and 10.15 acres for males; 3.30 and 7.80 acres for females. Mean home range of juveniles was comparable to the range of adult females. Distribution of catches of hares repeatedly caught and tracking of toe-clipped hares showed that trap-revealed ranges are related to true ranges and that ranges of most adults are fairly stable. A tendency towards farther ranging and linearity of movements was shown by some hares in winter. Location and use of forms are described. Signs of feeding showed that hares fed on conifers and shrubs in winter and herbaceous vegetation in summer. Young juvenile hares "disappeared" from the population at a high rate. Probability of their survival from birth to the first breeding season was less than 0.18. Crude survival rate of all hares was 0.73. Neither disease nor parasitism constituted serious decimating factors, and pathology of 74 hares necropsied was normal. Predation was the most important source of mortality among hares of all ages. Symptoms of "trap sickness" were shown, mainly in winter, by 29 of 207 hares. The following parasites were found in 50 necropsied hares, and 207 hares examined for ticks and fleas: Protozoa, Eimeria stiedae; Cestoda, Mosgovoyia pectinata americana, and Taenia pisiformis; Nematoda, Trichostrongylus affinis, and Nematodirus triangularis; Acarina, Haemphysalis leporis-palustris; and Siphonaptera, Cediopsyllus simplex and Hoplopsyllus affinis.
Download or read book A Food Habits Study of the Snowshoe Hare Lepus Americanus Washingtonii Baird in Western Oregon written by Albert Mozejko and published by . This book was released on 1972 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Technical Report PNW GTR written by and published by . This book was released on 1990 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distribution and Population Status of the Snowshoe Hare Lepus Americanus Erxleben on Connecticut Hill Wildlife Management Area New York written by Chia-Yuan Chien and published by . This book was released on 1973 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wild Mammals of North America written by George A. Feldhamer and published by JHU Press. This book was released on 2003-11-19 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Table of contents
Download or read book Wildlife Review written by and published by . This book was released on 1965 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Abstracts written by U.S. Fish and Wildlife Service and published by . This book was released on 1954 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the World Lagomorph Conference written by Ken Myers and published by [Guelph, Ont.] : University of Guelph with the assistance of IUCN Species Survival Commission and World Wildlife Fund, Canada. This book was released on 1981 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment and Management of Animal Damage in Pacific Northwest Forest written by and published by . This book was released on 1990 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Technical Bulletin written by Alberta. Fish and Wildlife Division and published by [Edmonton] Department of Lands and Forests, Fish and Wildlife Division.. This book was released on 1969 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2000 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snowshoe Hare Distribution and Habitat Use in Wisconsin written by David A. Buehler and published by . This book was released on 1980 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book O S U Theses and Dissertations 1960 1965 written by Patricia A. Brandt and published by . This book was released on 1967 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silvicultural Approaches to Animal Damage Management in Pacific Northwest Forests written by and published by . This book was released on 1992 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mammals in Western Coniferous Forest Ecosystems written by Hugh Clark Black and published by . This book was released on 1977 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume results from an experiment in data retrieval. During the initial stage of the Coniferous Forest Biome the authors were asked to provide access to the literature on mammals as it pertained to the interests of the Biome investigation. One constraint was that the total number of entries should not much exceed 1000. Another was that no new items would be added after the project was undertaken (1971). In order to keep the total number of items within bounds, it was necessary to choose. In choosing, we emphasized the geographic location of the Biome Investigation, the Pacific Northwest, and the emphasis of most Biome studies, productivity and effects of forest manipulation. We attempted to include all mammal papers that would be useful both to vertebrate zoologists working within the fields of Biome interest and to their colleagues in other disciplines. Therefore both methodological and substantive papers are included. Taxonomy is derived from Ingles (1965) and, where necessary, from Walker et al. (1964).
Download or read book The Zoological Record written by and published by . This book was released on 1967 with total page 1194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecology of Even aged Forest Plantations written by International Union of Forestry Research Organizations. Division I--Site and Silviculture and published by . This book was released on 1979 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
