Journal ArticleDOI
Seasonal and year-to-year differences in food selection by beavers.
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TLDR
Beavers exhibited both seasonal and year-to-year differences in preference for certain genera, which may partly reflect greater seasonal stability in concentrations of stored nutrients in coniferous tree bark than in deciduous tree bark.Abstract:
Selection of trees for food by a colony of beavers in central Massachusetts was studied from September 1972 through April 1974. The beavers exhibited both seasonal and year-to-year differences in preference for certain genera. Pine was selected against during fall but not spring, and there was a switch in preference from birch during fall 1972 to oak and witch hazel in fall 1973. These differences may partly reflect greater seasonal stability in concentrations of stored nutrients in coniferous tree bark than in deciduous tree bark, and greater year-to-year stability in bark concentrations of stored nutrients in non-mast-seeding species than in mast-seeding species (1972 was a mast year for oaks in central Massachusetts).read more
Citations
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Journal ArticleDOI
Patch Dynamics in Lotic Systems: The Stream as a Mosaic
Catherine M. Pringle,Robert J. Naiman,Gernot Bretschko,James R. Karr,Mark W. Oswood,Jackson R. Webster,Robin L. Welcomme,Michael J. Winterbourn +7 more
TL;DR: In this paper, a patch-dynamics framework for the investigation of pattern and process in lotic ecosystems that considers how specific patch characteristics determine biotic and abiotic processes over various scales is presented.
Journal ArticleDOI
The sampling characteristics of electivity indices
TL;DR: The host preferences of gypsy moth, Lymantria dispar, feeding on tree foliage in an undisturbed deciduous forest in southwestern Quebec, Canada were used to compare the available electivity indices.
Journal ArticleDOI
Comparing Spatial Pattern in Unaltered Old-Growth and Disturbed Forest Landscapes.
TL;DR: It is found that a number of important structural features of the intact old-growth landscape do not occur in the disturbed landscape, and significant landscape heterogeneity in this glaciated region is produced by landforms alone, without natural or human disturbances.
Journal ArticleDOI
Selective Foraging and Ecosystem Processes in Boreal Forests
John Pastor,Robert J. Naiman +1 more
TL;DR: It is suggested that selective foraging alters feedbacks between plants and decomposers andbetween plants and herbivores, which cause the effects of herbivore on ecosystems to persist even after the herbivors arc no longer present.
Journal ArticleDOI
The general ecology of beavers (Castor spp.), as related to their influence on stream ecosystems and riparian habitats, and the subsequent effects on fish – a review
P. Collen,R. J. Gibson +1 more
TL;DR: The practicality and benefits of reintroducing or restoring beaver populations will vary according to location, and should be considered in conjunction with a managementplan to control their densities.
References
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Book
The analysis of cross-classified categorical data
TL;DR: The second edition has been updated and revised, with more emphasis on logic and logistic response properties and on the small-sample behavior of chi-square statistics as mentioned in this paper, and includes 40 to 50 new problems with most having separate data sheets.
Journal ArticleDOI
Quantitative measurement of food selection : A modification of the forage ratio and Ivlev's electivity index
TL;DR: The forage ratio and the Ivlev's electivity index are common measures to quantify food selection but the values of both indices depend not only on the extent of selection but also on the relative abundances of the food types in the environment as discussed by the authors.
Book
Physiology of Trees
TL;DR: This book focuses on the ascent of sap, internal factors and environmental factors affecting growth, and the bibliography is excellent and extensive, with over 1, 700 references up to and including 1958.