Why should humans be concerned about rarity of species not just extinction rates quizlet?

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There are a number of traits that increase a species' vulnerability to extinction. Different species may have different suites of these characteristics, but managers should pay special attention to species possessing many of these traits.
In general, rare species are more likely to go extinct. There are three different ways in which a species can be considered rare. In the first, the species has a limited geographic range. Species limited to a small spatial area are more likely to suffer from stochastic environmental events. The second definition of rarity encompasses species with very specific environmental requirements (food, shelter, abiotic aspects). A perturbation in the natural habitat will endanger the species. The third definition of rarity is simply a population with low population numbers. Again, small populations are more likely to go extinct as a result of demographic stochasticity.
Even if a species is not rare, it may have natural history characteristics which increase its vulnerability to extinction: large body size, need for large home range, poor dispersal abilities, tendency to aggregate, seasonal migration, or relatedness to other recently extinct species. The particular combination of these traits (rarity and natural history) in different species of conservation concern would lead managers to use different practices. For instance, a species with low numbers that migrates seasonally would require protection of all habitats used during its life cycle (ex: monarchs). A species with a restricted range and specific habitat requirements would lead to protection of that habitat, whereas a rare species that is a generalist but disperses poorly might be a good candidate for translocations.

There are a number of traits that increase a species' vulnerability to extinction. managers should pay special attention to species possessing many of these traits.
In general, rare species are more likely to go extinct. The species has a limited geographic range. Species limited to a small spatial area are more likely to suffer from stochastic environmental events. very specific environmental requirements (food, shelter, abiotic aspects). low population numbers. Again, small populations are more likely to go extinct as a result of demographic stochasticity.
Even if a species is not rare, it may have natural history characteristics which increase its vulnerability to extinction: large body size, need for large home range, poor dispersal abilities, tendency to aggregate, seasonal migration, or relatedness to other recently extinct species. The particular combination of these traits (rarity and natural history) in different species of conservation concern would lead managers to use different practices. For instance, a species with low numbers that migrates seasonally would require protection of all habitats used during its life cycle (ex: monarchs). A species with a restricted range and specific habitat requirements would lead to protection of that habitat, whereas a rare species that is a generalist but disperses poorly might be a good candidate for translocations.

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