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Mem 117 c29-heat production in male cones of 7 asian cycas species cycadales. sold by nybgshop.org for $4.99

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This purchase only includes chapter 29 of this title.

Abstract

Heat production in male cones is a trait known to be widespread in the modern cycad¬†floras of Africa, Australia, and the New World; however, little¬†data is available for this¬†phenomenon in the Asian cycad flora. In this paper, heat production is documented in¬†male cones of seven Asian Cycas species that are either¬†restricted to China or have ranges¬†that extend into China. These¬†species belong in the sections Asiorientales, Stangerioides,¬†and Indosinenses within the genus Cycas. Six of the seven species displayed temperatures¬†that peak at 3√Ę‚ā¨‚Äú15√ā¬įC above ambient in the late afternoon¬†to early evening¬†between 1730¬†and 2200 h. One species, C. revoluta, displayed weak but constant heat production at¬†temperatures typically 2√Ę‚ā¨‚Äú3√ā¬įC above ambient without a clear daily temperature spike.¬†Temperature patterns may be related to the type of insect visitor or pollinator associated¬†with the cones of each Cycas species. Most of those¬†with daily peaks have curculionid¬†and/or erotylid beetle cone visitors, while the one with no peak is pollinated by¬†nitidulid beetles. The presence of thermogenesis in male cones of all seven Asian Cycas¬†species investigated is additional evidence that cone thermogenesis is present¬†throughout¬†modern cycad floras and is observed in all extant cycad genera except for Stangeria.




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