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本帖最后由 细胞海洋 于 2010-8-26 10:12 编辑 8 n* x4 d4 M2 A* o$ |. t7 C7 ]
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Darwin recognized eusocial insect colonies — with sterile workers and fertile queens — as a challenge to evolutionary theory: it is tricky to explain why some individuals sacrifice their own reproductive potential in order to raise the offspring of others. Kin selection theory, in which individual fitness derives from increasing the survival of a relatives’ offspring, is often suggested as the explanation. In an Analysis feature, Martin Nowak, Corina Tarnita and Edward O. Wilson point out that this approach is not generally applicable. Instead, they say, standard natural selection combined with precise models of population structure provides a simpler answer. On the cover, Formica obscuripes nestmate workers engaging in trophallaxis, or the social sharing of liquid food. Picture credit: Alex Wild.
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发表于 2010-8-26 08:56
发表于 2010-8-26 09:43
