||Nonrandom spatial structuring of orchids in a hybrid zone of three Orchis species
||Jacquemyn, H.; Brys, R.; Honnay, O.; Roldán-Ruiz, I.; Lievens, B.; Wiegand, T.
||hybridization; mycorrhizal fungi; Orchidaceae; seed germination; spatial point pattern analysis
species–species associations may arise from a range of factors,
including localized dispersal, intra- and interspecific interactions and
heterogeneous environmental conditions. Because seed germination and
establishment in orchids are critically dependent upon the availability
of suitable mycorrhizal fungi, species–species associations in orchids
may reflect associations with mycorrhizal fungi.
test this hypothesis, we examined spatial association patterns,
mycorrhizal associations and germination success in a hybrid zone
containing three species of the genus Orchis (Orchis anthropophora, Orchis militaris and Orchis purpurea).
- Hybridization occurred predominantly between O. purpurea and O. militaris. The spatial distribution patterns of most pure species and hybrids were independent from each other, except that of O. purpurea
and its hybrids. The fungal community composition of established
individuals differed significantly between pure species, but not between
hybrids and O. purpurea. Seed germination experiments using
pure seeds showed that the highest number of protocorms were found in
regions where adult individuals were most abundant. In the case of
hybrid seeds, germination was restricted to areas where the mother plant
was most abundant.
these results suggest that the observed nonrandom spatial distribution
of both pure and hybrid plants is dependent on the contingencies of the
spatial distribution of suitable mycorrhizal fungi.
|Persistent UFZ Identifier
|Jacquemyn, H., Brys, R., Honnay, O., Roldán-Ruiz, I., Lievens, B., Wiegand, T. (2012):
Nonrandom spatial structuring of orchids in a hybrid zone of three Orchis species
New Phytol. 193 (2), 454 - 464