By Author Unknown, Lev R. Ginzburg
Analyses of ecological possibility overview for biotechnology as considered predominantly by means of scientists doing learn during this zone. The emphasis is on ecological dangers linked to the discharge of genetically-engineered organisms within the surroundings
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The environmental impact of Quaylea is evidently minor because black scale is considered to be under good biological control on citrus (DeBach 1964b; Laing and Hamai 1976). E. Ehler, unpublished observations; Kennett 1986). 8 Planned Introductions in Biological Control Future Research In future biological-control programs, the environmental impact of an introduced natural enemy that establishes should be assessed whenever possible—if for no other reason than to learn more about the ecological structure of the target system.
Observations by Andres (1985) suggest that this is the result of the evolution of a new host race of Chrysolina. If so, this would represent a kind of "delayed" environmental impact of an introduced species. Fortunately, the problem on H. calycinum is not considered to be major; however, this could change as the presumed host-race formation continues in Chrysolina. 2 Environmental Impact of Introduced Biological-Control Agents 33 than to learn more about post-colonization evolutionary change in a biological-control agent.
There are many examples of fortuitous biological control of insect pests—as a result of both planned and unplanned introductions (Wilson 1965; DeBach 1971a; Clausen 1978). Examples of environmental impact due to lack of host specificity are not restricted to insectan natural enemies. Vertebrate predators have been introduced in a number of cases for control of either invertebrates, other vertebrates, or weeds (Davis et al. 1976; Wood 1985; Coulson and Soper 1989; Harris 1990). These introductions have not been without negative impacts, and as a result, vertebrate predators have received some "bad publicity" (Coulson and Soper, 1989).