Temporally changing male reproductive success and resource allocation strategy in protandrous Heracleum lanatum (Apiaceae)

Akihiro Konuma, Tetsukazu Yahara

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Abstract

Few observations have been made on temporal changes in the siring success of flowers in the male stage. In this study, we estimated both male and female contributions to fitness for 21 plants of protandrous andromonoecious Heracleum lanatum with differing dates of first flowering. The results of multiple regression analysis showed that total male fitness significantly increases with the advance of the first-flowering date but does not depend upon plant size, whereas female fitness increases with plant size but does not depend upon the first-flowering date. We also showed that the earlier-flowering plants have more late-blooming male flowers in their secondary umbels. Based on these results, we suggest that polymorphism of the early- and late-bloomers may be maintained by frequency-dependent selection through temporally changing male reproductive success.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalJournal of Plant Research
Volume110
Issue number2
Publication statusPublished - Jun 1997

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All Science Journal Classification (ASJC) codes

  • Plant Science

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