C. A. DeYoung

Evaluation of Bias in the Proportion of White-tailed Deer Fawns Sighted from Helicopters

We marked fawns and adult white-tailed deer (Odocoileus virginianus) on 2 south Texas areas during 1986-88. Deer sighted on repeated helicopter flights were evaluated to determine if the age ratio of sightings matched the known ratio of marked fawns-to-adults in the populations. There was a trend toward undercounting fawns on each area.

Effects of Short Duration Grazing on Deer Home Ranges

Twenty-three white-tailed deer (Odocoileus virginianus) were radio-tracked from February 1984 to February 1985 on adjacent south Texas areas subjected to short duration (SDG) and continuous (CG) cattle grazing. Deer that ranged between the 2 grazing treatments were termed border deer. There were no (P > 0.05) differences in home range size by grazing treatment or sex, but variability was high. Home ranges were similar for deer on the SDG vs. CG area in spite of a 62% greater stocking rate under short duration for 9 of 12 study months. During the last 3 months, stocking rate in the SDG...

Bed Sites of White-tailed Deer Fawns in South Texas

Canopy cover of vegetation was sampled at bed sites of 30 white-tailed deer (Odocoileus virginianus) fawns in south Texas during August 1986. Visual obstruction by vegetation to I m height was sampled at the bed sites, within 25 m of the bed sites, and at random points within 2 pastures. Mean canopy cover at bed sites was greatest for grasses (50.2%) and forbs (15.9%). Cover of woody plants within 25 m was 19%. Mean visual obstruction at the bed sites was consistently greater than that within 25 m or at random points within the 2 pastures. Fawns selected bed sites with more screening cover...