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| Titel |
Colonization of an empty island: how does a plant with a plastic gender system respond? |
| VerfasserIn |
M. Philipp, H. Adsersen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 23 ; Nr. 11, no. 23 (2014-12-03), S.6657-6665 |
| Datensatznummer |
250117708
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| Publikation (Nr.) |
 copernicus.org/bg-11-6657-2014.pdf |
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| Zusammenfassung |
| Honckenya peploides is the most common plant species on the island of Surtsey. It arrived in
1967 and after a juvenile period of 4 years it produced seeds and had
increased its number from below 100 to several millions. Most populations
had the individuals distributed in a regular or random pattern, suggesting
that intraspecific competition is important. H. peploides has a subdioecious
reproductive system consisting of pistillate plants producing capsules, and
staminate plants delivering pollen. Some of the latter are in addition producing
capsules and are denoted hermaphrodites. Populations at the south coast of
Iceland had around equal numbers of pistillate and staminate plants. At Surtsey we
found more pistillate plants, probably due to their higher water stress
tolerance. We also found a tendency to a higher
frequency of hermaphrodite plants with a higher number of seeds per capsule
compared to populations at the south coast of Iceland and the nearby island
of Heimaey. We suggest that this arises from the time right after
the colonization of Surtsey where population size was small and the small
generalist pollinators were not able to deposit sufficient pollen on
pistillate plants, causing the hermaphrodites to have an advantage by being
able to set seed after selfing. The result of this initial advantage of the
hermaphrodites in combination with the inheritance of the sexes can still be
seen due to the longevity of individuals. A generalized account of the
colonization history of H. peploides is given. |
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