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Extra resources for Conserving Living Natural Resources: In the Context of a Changing World

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Does the author have a strong interest in advocating a particular measure or in defending a certain school of thought? Is the author associated with a group that is defending or attacking a particular position? If the evidence comes from historical documents, what was the perspective of the author? What interests and biases might have colored the information that was recorded? Where is this evidence presented? Is it in a professional journal? If not, is it in a publication that is trying to push a particular viewpoint or perhaps to sensationalize news?

This assumption led to repeated cycles of depletion and expansion, which are described in more detail below. In North America, this process came to an end only when westward expansion was stopped by the Pacific Ocean. European colonization of many other parts of the world led to similar changes in land tenure. Communally owned resources were often converted to privately owned, marketable land (Browning 1971; Grove 1990; Gadgil and Guha 1992, 1995). Dramatic and widespread changes in levels of resource exploitation were associated with this change, and as a result many habitats were altered and populations of numerous species declined.

You are then in a position to compare these data on pheasant density before predator removal with the data you obtain after you begin the treatment. The pretreatment data enable you to assess differences between the treatment and control groups. By doing this you are, in effect, adding another control – the pretreatment data – to use as a standard in assessing the effects of the treatment. The use of before-and-after data allows you to compare the magnitude of the change in pheasant densities on the treatment and control plots.

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