Treesearch

Available information on year-round food habits of white-tailed deer in the Upper Great Lakes Region (UGLR) is summarized. Problems of deer in that region are discussed. There is a need for additional information on year-round diet, but new study techniques must be developed if a complete picture of diet is to be obtained.

Quaking aspen clones expanded over more area, and regenerated greater sucker stem densities and biomass than did bigtooth aspen clones. However, sucker height growth was similar between the two species.

Illustrates 26 bird habitats occurring in the Ozarks.

Presents statistics on Minnesota's growing-stock and sawtimber volumes by county for 1977. Includes a map showing growing-stock volume classes by county.

The diameter growth of red spruce with 1/6, 1/3, and 1/2 crown removed was compared with that of unpruned trees for 18 growing seasons. Although removal of 1/6 of the live crown did not adversely affect annual radial growth, compared with that of the controls, removal of 1/3 and 1/2 had a significant effect on the cumulative radial growth for 2 and 9 growing seasons, respectively.

Cytohistology and the development and morphogenesis of sugar maple (Acer saccharum Marsh.) shoots were studied. Three types were recognized: short shoots, long shoots entirely preformed in the bud (Epf long), and long shoots partially preformed in the bud (heterophyllous). The three shoot types varied not only in the size and number of internodes and leaves but also in the development of terminal buds. Terminal bud formation was delayed in heterophyllous shoots but because of a shorter plastochron, which extended later into the growing season, the terminal apices of these shoots were able...

Three species of birds and 5 species of mammals were captured in the wild from 2 plots in which mortality from naturally occurring nucleopolyhedrosis virus (NPV) among gypsy moth, Lymantria dispar (L.), larvae was 15 % and 70 %. Bioassays of intestinal contents showed that blue jays, Cyanocitta cristata (L.), towhees, Pipilo erythrophthalmus (L.), white-footed mice, Peromyscus leucopus Rafinesque), redback voles, Clethrionomys gapperi (Vigers), raccoons, Procyon lotor (L.), and a chipmunk, Tamias striatus (L.), contained infectious NPV (polyhedra) in their alimentary tracts, whereas...

Early observers noted that the Kirtland's Warbler (Dendroica kirtlandii) required young jack pine (Pinus banksiana) stands of fire origin (Wood 1904, 1926; Barrows 1921; Leopold 1924; Wing 1933). Leopold (1924) observed that they nested in stands about 1 to 3 m tall and that the nest was usually within 3 dm (1dm = 0.1m) of the base of jack pine and well concealed by heavy ground vegetation. Wood (1926) further observed that they favored thick low branches, numerous small openings, and that as the stand matured, its value to the Kirtland's Warbler declined as shade destroyed the ground...

New emphasis has been placed on the weight of whole trees and portions of trees. Weight inventories and purchase of wood by weight are becoming increasingly common for saw logs as well as pulpwood. More information needs to be gathered on the weight of portions of tree stems, however, before weight can be a standard measurement unit. This information must also be flexible enough to be used with varying utilization standards so that new inventories will not be required when a standard changes. The objective of this study was to develop main stem green and dry weights with and without bark...

Ninety perrent of the commercial forest land in Maryland--2,280,000 acres-is in the hands of some 95,800 owners. Eighty-seven percent of these owners are individuals. The average individual owner is middle aged, well educated, relatively affluent, and from a rural or farm background. Twenty-two percent of the private owners have harvested timber from their land. These owners own 53 percent of the private woodland. Forty-seven per cent of the owners intend to harvest timber from their land at some future date . They control 69 percent of the private woodland. Most owners show little...