Comparative sensitivity analysis of stable stage structures and reproductive values |
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Authors: | Uno Wennergren Per Weinerfelt Göran Forsling |
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Institution: | 1. Department of Biology, Link?ping University, S-58183, Link?ping, Sweden 3. Department of Mathematics, Link?ping University, S-58183, Link?ping, Sweden
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Abstract: | New formulas for deriving the sensitivities of stable stage structures and reproductive values to changes in vital rates are
presented. They enable comparison of the sensities to changes of different elements in the projection matrix; in other words,
comparison of partial derivatives of the eigenvectors. These kinds of sensitivities can be used in applied problems such as
an analysis of the effect of harvesting on the population structure. However, in this paper, we examine the application of
the sensitivities in a more general ecological context. We investigate why the stable stage structure of the mustard aphid,Lipaphis erysimi, changes very little in the temperature interval 10–30°C. The sensitivities of the stable stage structure at 15°C and 25°C
were derived. The character of the sensitivites were the same in both temperatures although the stage structure was more sensitive
to changes at 15°C than at 25°C. The sensitivity analysis also revealed that the temperature variation results in changes
in fecundity and developmental rate that have a counteractive effect on the population structure. |
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