Seven species extinctions (indicated by horizontal bars) completely eliminate three deep branching clades such as in Figure A below
What is the likely impact of such extinctions on the diversity of physiological traits when compared to a case when the same number of extinctions is spread evenly across different clades (Figure B)?
a. It affects the same number of species, therefore the effect on physiological diversity is the same.
b. Physiological diversity is always greater within than between clades. The extinctions in Figure B will cause a greater loss of physiological diversity.
c. Deep branching points correspond to greater evolutionary differentiation. This is also the case for physiological traits. The extinctions in Figure A will have the greater effect.
d. All of the above are equally likely.
C
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