Abstract

Thermogenesis occurs in the strobili of 42 of 43 species in the 10 genera of cycads, indicating a wide-spread phenomenon in this group. Heat production generally follows a circadian rhythm, and its strength and duration are positively correlated with strobili size. Male strobili contain high concentrations of starch that may supply the energy for thermogenesis. Strobili of all examined species release odors that are sweet, resiny, or musty. Heat production in the strobili may help to volatilize odors that attract insects for pollination.

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