Concept explainers
INTERPRET DATA Examine Figure 56-24. How many of the sampled species are found in the nonserpentine soil? in the serpentine soil? in the ecotone? What generalization about ecotones do these data support?
RESULTS AND CONCLUSION: The various plant species found in the two communities (yellow and blue) and in the ecotone between them (green) are shown in the graph. The ecotone had a greater richness than either adjoining community.
SOURCE: Modified from C.D. White, “Vegetation–Soil Chemistry Correlations in Serpentine Ecosystems,” Ph.D. dissertation (University of Oregon, Eugene, 1971). Reprinted with permission of Dr. Charles D. White.
Figure 56-24 Ecotones and species richness
Note that the two fescues in the figure are different species.
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