Browsing Journal of Range Management, Volume 34, Number 1 (January 1984) by Subjects
Now showing items 1-2 of 2
The Effect of Strip Width on Helicopter Censusing of DeerEvaluation of the numbers of white-tailed deer observed in the first (inside) 50 m compared to the second (outside) 50 m strips from helicopter census transects on brush-covered rangelands in Texas revealed from 34-73% fewer animals in the latter. The average reduction of approximately 53% suggests that helicopter censuses yield density estimates about 25% low. Correction for these underestimates could lead to more efficient management of the resource as well as elevated income in areas commercializing hunting.
Wildlife Habitat on Grazed or Ungrazed Small Pond Shorelines in South TexasThree man-made ponds constructed in 1956 and fenced to exclude cattle from the shoreline were selected to study the effects of cattle on shoreline vegetation. These ponds were partially opened in 1977 to allow grazing on one-half of the shoreline. The vegetation was sampled monthly with an inclined 10-point frame placed at 1-m intervals along transects in the opened and fenced sections of the shorelines. In most areas the foliar cover and vegetation height were reduced by cattle pressure. The stable Long-tom Community and the Knotgrass-Smartweed Community were more affected by cattle pressure than the Transition Community which changed as the water level rose or dropped. The seasonal Aquatic Community was least affected by cattle pressure and thus maintained good stands of waterfowl food plants. Carefully planned grazing which allows key rest and grazing periods will control the impact of grazing on the shoreline vegetation. Stable waterfowl habitat on the shorelines of small man-made ponds in South Texas can best be protected by fencing at least one-half of the shoreline to restrict cattle use.