Download Size-Structured Populations: Ecology and Evolution by R. M. May (auth.), Dr. Bo Ebenman, Dr. Lennart Persson PDF
By R. M. May (auth.), Dr. Bo Ebenman, Dr. Lennart Persson (eds.)
At final either ecology and evolution are coated during this research at the dynamics of size-structured populations. How does common choice form progress styles and lifestyles cycles of people, and consequently the size-structure of populations? This ebook will stimulate biologists to appear into a few vital and fascinating organic difficulties from a brand new perspective of strategy, touching on: - lifestyles heritage evolution, - intraspecific festival and area of interest conception, - constitution and dynamics of ecological communities.
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Size-Structured Populations: Ecology and Evolution
Eventually either ecology and evolution are lined during this learn at the dynamics of size-structured populations. How does traditional choice form development styles and lifestyles cycles of people, and consequently the size-structure of populations? This booklet will stimulate biologists to seem into a few vital and fascinating organic difficulties from a brand new perspective of technique, pertaining to: - existence heritage evolution, - intraspecific pageant and area of interest idea, - constitution and dynamics of ecological groups.
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Extra resources for Size-Structured Populations: Ecology and Evolution
Example text
The equilibrium, shown in Fig. 4, is a mean growth trajectory that begins at the size of the egg and then instantaneously jumps to in- 23 The Evolution of Size in Size-Structured Populations + 00 I ~ JI--------Fig. ::::! UJ en 0 Fig. 5 } I1:::=====I_ _ __ AGE Fig. 4. Above qualitative sketch of the selection gradient on size that results when mortality decreases and birth rate increases will size. Below the equilibrium growth trajectory which results from the above selection gradient in the absence of genetic constraints Fig.
13 LI Zo = the length at birth (instar 1); LI Zj for i > 0 = the growth from instar i to i + 1. 01 levels. M. 02 4 8 12 16 200 INSTAR Fig. 4. The mean (closed circles) and variance (open circles) for instar-specific lengths for a clone of Daphnia pulex grown on nine food concentrations. The initial cohort for each experiment consisted of approximately SO individuals. The plots are extended to the point at which N:s 10. Inset numbers refer to the food concentration, I1g elml variance for the same clone grown on nine food concentrations are presented in Fig.
Although the demographic model is highly simplified, it seems plausible that at least some organisms experience ecological conditions that produce selection gradients qualitatively similar to those described above. The flaw apparently lies in the assumption that a population can have an infinitely flexible genetic architecture. This returns us to the earlier point that an evolutionary equilibrium can be achieved in two ways. By considering only how the forces of selection might mold the mean growth trajectory, we have neglected the role of genetic constraints imposed by patterns of genetic variation and covariation.