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Population Management. Population Management. We will discuss techniques we will need to use to save species after we have already learned its basic population structure and the factors effecting it We will concentrate on techniques for:
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Population Management We will discuss techniques we will need to use to save species after we have already learned its basic population structure and the factors effecting it We will concentrate on techniques for: • providing resources that may be scarce such as food or water • controlling threats such as predators, especially human predators • directly manipulating populations such as moving individuals to new sites
Feeding animals has two potential drawbacks: 1) it may foster long-term dependence on people, leaving animals vulnerable to starvation when feeding stops; 2) feeding concentrates animals and may make it easier for diseases to spread or for predators to find them
Controlling threats to populations • Especially small-scale, local threats
Letter to a Wild-flower Digger • “This letter is addressed, through the columns of the State Journal, to that unknown person who last week dug up the only remaining yellow ladyslipper in the Wingra Woods. While your name is unknown, your action sufficiently portrays the low estate of either your character or your education. On the chance that the latter rather than the former is at fault, I address to you this letter. I address it to all whose gardens at this season suddenly blossom forth with new wildflowers lifted from other people’s woods.” – Aldo Leopold 1938
Types of Mortality Compensatory mortality occurs when human harvesting does not increase mortality above natural levels Additive mortality occurs when human harvesting does increase mortality above natural levels
