In some rocky intertidal habitats, the barnacle Chthamalus can survive across the same depths as can the barnacle Balanus
However, where the two occur together, Chthamalus
adults are found only in the more stressful upper portions of the habitat where they are more
prone to desiccation. This is an example of:
A. the mutualistic form of symbiosis.
B. intraspecific competition reducing the size
of Chthamalus' fundamental niche to a
smaller realized niche.
C. mutualism reducing the size of Balanus'
realized niche to a smaller fundamental
niche.
D. competitive exclusion reducing the size of
Chthamalus' fundamental niche to a smaller
realized niche.
E. competitive exclusion expanding the size
of Balanus' realized niche to a larger
fundamental niche.
D
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Return to the survivorship model you created using dice: You probably found that the chance of dying from heart disease is approximately one-sixth for each die, indicating that survivorship is essentially the same for each age group. Compare what happened in your model with a realistic projection showing at what ages most humans die of heart disease.
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A) acute B) uncommon C) severe D) recurring E) persistent