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Life history traits and coexistence of an amphidiploid, Drosera tokaiensis , and its parental species, D. rotundifolia and D. spatulata (Droseraceae)

2004; Wiley; Volume: 19; Issue: 2 Linguagem: Inglês

10.1111/j.1442-1984.2004.00102.x

1442-1984

Mariko Nakano, Eiichiro Kinoshita, Kunihiko Ueda,

Plant Reproductive Biology

Abstract We compared the life history traits of an amphidiploid species, Drosera tokaiensis (Komiya & C. Shibata) T. Nakamura & Ueda, with those of the parental species, a diploid Drosera rotundifolia L and a tetraploid Drosera spatulata Labill. to characterize them and clarify the conditions for coexistence. The ranges of the parental species are quite different, but overlap in Japan. The amphidiploid and the parents grow together in some natural habitats. Observations and experiments on reproductive properties were carried out in a glasshouse and a laboratory. Seeds of D. rotundifolia were dormant, whereas those of D. spatulata were not. In D. tokaiensis , the dormant/non‐dormant seed ratio varied from site to site. Drosera rotundifolia has such life history traits as concentrated flowering and seed dormancy, which are relevant to habitats with short growing seasons and a severe winter. Drosera spatulata has such traits as a prolonged duration of flowering and non‐dormancy, relevant to habitats with long growing seasons and a mild winter. Drosera tokaiensis possesses life history traits of the parental species to various degrees, but exhibits no extreme traits. It is suggested that separation of flowering time and autogamy allow the amphidiploid to coexist with the parental species.