Part 1: Pesticide Spraying Case Study Analysis: Use your graph and data table to answer these questions.1.Plot a graph which shows the changes over time of the population of insect pests in each area: A, B and C.a.Why did the population of pests in Area A increase in 1978 when, in 1977, it appeared that the pest had been almost completely eliminated?b.What indication is there that Area C has not been directly aFected by the aerial spraying of the pesticide?2.Discuss the eFect that the pesticide had on natural pest controls in each area.a.Which categories would be considered natural pest controls?b.How did this eventually in±uence the size of the population?3.Consider the eFect that the pesticide had on ²sh and bird species.a.Why is the concentration of pesticide so high in ²sh and bird species?b.What change in the concentrations of pesticide in the ²sh and bird life represent the point where signi²cant change in mortality occurs?c.Suggest a food chain that would link the pine stand vegetation to the poor nesting success of the birds.4.What method(s) could be used to remedy this “eco-mess”?5.How did the use of this pesticide aFect species diversity and therefore environmental stability?An insect pest has attacked about 20 percent of the trees in a pure stand of white pine. In an eFort to reduce his economic loss, the owner has his forest crop sprayed each springwith a relatively new pesticide. The species that he is trying to eliminate is normally preyed upon by other insects, a parasite, and song birds from nearby woods. To the south of his property is a bird sanctuary for rare species of waterfowl and the carnivorous osprey. He has been assured that natural barriers andthe wind direction will keep the pesticide out of the wildlife area. The three areas shown on the diagram (³igure 1) were carefully studied over a ²ve-year period by researchers from a nearby university.
Что-то сказанное панком не давало ему покоя. Я прихожу сюда каждый вечер. А что, если этот парень способен ему помочь. - Прошу прощения, - сказал. - Я не расслышал, как тебя зовут.