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Evolution__3rd_Edition

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Plate 6<br />

Scrub jays (Aphelocoma coerulescens)<br />

in Florida breed in cooperative groups<br />

of a parental pair and a number of<br />

“helpers.” Kin selection is probably<br />

the reason why altruistic helping is<br />

favored in this species in Florida<br />

(Section 11.2.4, p. 299).<br />

Plate 5<br />

These stalk-eyed flies from Malaya have an<br />

eye span that is longer than their body.<br />

(a) Cyrtodiopsis dalmanni. There is an<br />

allometric relation between eye span and<br />

body length, and Wilkinson has artificially<br />

selected the flies to alter the slope of the<br />

allometric relation. (b) The closely related<br />

species C. whitei. (Section 10.7.3, p. 280.)<br />

(Photos courtesy of Jerry Wilkinson.)

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