Robert A. Riggs
Oregon State University
18 Papers
268 Citations
Robert A. Riggs is an academic researcher from Oregon State University. The author has contributed to research in topics: Population & Understory. The author has an hindex of 11, co-authored 18 publications. Previous affiliations of Robert A. Riggs include Boise Cascade.
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Papers
Effects of summer‐autumn nutrition and parturition date on reproduction and survival of elk
John G. Cook,Bruce K. Johnson,Rachel C. Cook,Robert A. Riggs,Timothy DelCurto,Larry D. Bryant,Larry L. Irwin +6 more
TL;DR: Summer-autumn nutrition largely determined calf body size at the start of winter and, consequently, determined the proportion of winter survived and survival of cows over winter, while body mass, body fat, and timing and probability of conception by cows in autumn were little influenced by parturition date the previous spring.
Regional and seasonal patterns of nutritional condition and reproduction in elk
Rachel C. Cook,John G. Cook,David J. Vales,Bruce K. Johnson,Scott M. McCorquodale,Lisa A. Shipley,Robert A. Riggs,Larry L. Irwin,Shannon L. Murphie,Bryan L. Murphie,Kathryn A. Schoenecker,Frank Geyer,P. Briggs Hall,Rocky D. Spencer,Dave Immell,Dewaine H. Jackson,Brett L. Tiller,Patrick J. Miller,Lowell Schmitz +18 more
TL;DR: Nos donnees semblent indiquer that les wapitis ont un regime alimentaire inadequat en ete and qu'il s'agit d'une situation generalisee.
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Nutrition-growth relations of elk calves during late summer and fall
John G. Cook,Lonnie J. Quinlan,Larry L. Irwin,Larry D. Bryant,Robert A. Riggs,Jack Ward Thomas +5 more
TL;DR: A deterministic model of growth was developed to compare body mass dynamics over autumn of calves on an optimum diet versus calves on diets available to free-ranging elk, and model projections indicated a 21% difference in body mass of the 2 groups by mid-December due to the lower concentration of digestible energy in diets offree-ranging calves.
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Modification of Mixed-Conifer Forests by Ruminant Herbivores in the Blue Mountains Ecological Province
Robert A. Riggs,Arthur R. Tiedemann,John G. Cook,Teena M. Ballard,Paul J. Edgerton,Martin Vavra,William C. Krueger,Frederick C. Hall,Larry D. Bryant,Larry L. Irwin,Timothy DelCurto +10 more
- 01 Sep 2000
TL;DR: Riggs et al. as discussed by the authors found that long-term foraging by Rocky Mountain mule deer (Odocoileus hemionus) and Rocky Mountain elk (Cervus elaphus) suppressed the development of deciduous shrubs.
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•Journal Article
Spatially explicit influences on northern goshawk nesting habitat in the interior pacific northwest
TL;DR: In this paper, the authors used logistic regression and classification and regression trees (CART) to evaluate habitat selection, construct models to calculate the probability of nesting, and explore relationships between reproductive output and habitat conditions.
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