Population recovery of black-tailed prairie dogs following control with zinc phosphide.

摘要: This study evrlluted the efficacy of 2% zinc phosphide grain bait as a control agent for black-tailed prairie dogs (Cynomysludovicignus) and rate at which returned to treated areas. Visual counts closely corresponded actual population trends were chosen technique evaluate changes dog numbers. Treatment al1 2, portions 5, colonies with between 30 July 25 August 1978 resulted in an average 85% (range 65 95%) reduction Rest results obtained 2 totally. The along perimeter had lowest percentage decrease numbers among treatment types fastest recovery. Prairie pretreatment levels within 1 year posttreatment colony. After years posttreatment, 3 other approaching levels. Three 5 appeared be needed obtain Control (Cynomys ludovicianus) is often considered economically feasible because it thought provide more forage livestock. Marsh (1967) 90% rodent populations necessary achieve satisfactory relief from economic damage. In general, studies have found baits strychnine or effective reducing efficacious (Tietjen 1976, Sullins 1977,1980a,b, Tietjenand Matschke 1982). There little information available, however, indicate how rapidly return areas following substantial reductions. Deer mice (Peromyscus maniculatus) invaded so negate any benefits (Gashwiler 1969, Pank 1972, Sullivan 1979). recovery toxicants important assessment cost/ benefit ratio such projects (Collins et al. 1984). purpose this was determine