Abstract
It has been suggested that polyploidization affects the ecological niche of a species, possibly ultimately leading to a shift in the distribution of the species, such as in geographical parthenogenesis. The phenomenon describes the wider distribution and shift of asexuals towards higher altitudes, northern latitudes and more extreme habitats when compared with their closely related sexual relatives. Several hypotheses have been proposed to explain such patterns with lacking empirical evidence because investigations rather focused on single hypotheses, which were rather tested several times independently on multiple organisms than vice versa. Therefore, the present study aimed to tackle the phenomenon of geographical parthenogenesis from multiple angles, i.e. testing several hypotheses simultaneously using Hieracium alpinum as a model system. In the arcto-alpine Asteraceae H. alpinum sexually reproducing diploid individuals occur in a small isolated area in the Eastern and Southern Carpathians, while apomictically reproducing, i.e. asexual reproduction via seeds, triploid plants occupy the remaining and much larger part of the range from the Balkans to the arctic parts of Europe. This implies that asexual triploids have had some fitness / colonization advantage(s), leading to a replacement of sexual diploids...
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Claims 2
Claim · model-written summary
Sexual diploid H. alpinum occurs in a small isolated area of the Eastern and Southern Carpathians.
- Taxon
- H. alpinum
Hieracium alpinume0 - Material
- sexually reproducing diploid individualse0
- Outcome
- occur in a small isolated areae0
- Setting
- Eastern and Southern Carpathianse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H. alpinum sexually reproducing diploid individuals occur in a small isolated area in the Eastern and Southern Carpathians”
Claim · model-written summary
Apomictic triploid H. alpinum occupies a larger range from the Balkans to arctic Europe.
- Taxon
- H. alpinumHieracium alpinume0
- Material
- triploid plantse0
- Outcome
- much larger part of the rangee0
- Setting
- Balkans to the arctic parts of Europee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H. alpinum sexually reproducing diploid individuals occur in a small isolated area in the Eastern and Southern Carpathians, while apomictically reproducing, i.e. asexual reproduction via seeds, triploid plants occupy the remaining and much larger part of the range from the Balkans to the arctic parts of Europe.”