H Jacquemyn
Research Institute for Nature and Forest
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Featured researches published by H Jacquemyn.
Annals of Botany | 2015
Rein Brys; H Jacquemyn
BACKGROUND AND AIMSnDistyly is a floral polymorphism characterized by the presence of two discrete morphs with reciprocal positioning of anthers and stigmas in flowers on different plants within the same population. Although reciprocal herkogamy and associated floral traits are generally thought to be discrete and strict polymorphisms, little is known about variation in floral traits related to the distylous syndrome within and among populations of a single species. In this study, variation in floral morphology and reciprocal positioning of the sexual organs in the distylous Primula veris (cowslip) is quantified.nnnMETHODSnData were collected in ten populations occurring in two contrasting habitat types (grasslands and forests), and for each population the average level of reciprocity was assessed, the strength of the self-incompatibility system was determined, and seed production under natural conditions was quantified.nnnRESULTSnIn grassland populations, flowers showed clear distyly with low and symmetric reciprocity indices at both the lower and upper level. In forests, P. veris produced larger flowers that showed strong deviations in stigma-anther separation, especially in the L-morph. This deviation was mainly driven by variation in stigma height, resulting in high and asymmetric reciprocity indices and the occurrence of several short-styled homostylous plants. Self-incompatibility was, however, strict in both habitats, and morph ratios did not differ significantly from isoplethy. The observed shift in reciprocity in forest populations was associated with a significant reduction in seed production in the L-morph.nnnCONCLUSIONSnThe results indicate that populations of P. veris show habitat-specific variation in flower morphology. Deviations from perfect reciprocal positioning of stigmas and anthers also translate into reduced seed production, suggesting that small changes in sexual organ reciprocity can have far-reaching ecological and evolutionary implications.
Natuur.focus | 2002
H Jacquemyn; Rein Brys; F Van Rossum; Patrick Endels; Martin Hermy; Ludwig Triest; Geert De Blust
Natuur.focus | 2003
H Jacquemyn; Rein Brys; Martin Hermy
Natuur.focus | 2003
H Jacquemyn; Rein Brys; Martin Hermy
Archive | 2002
H Jacquemyn; Rein Brys; Martin Hermy
Natuurhistorisch Maandblad | 2002
H Jacquemyn; Rein Brys; A Zeevaert; Martin Hermy
Archive | 2001
Rein Brys; H Jacquemyn; F Van Rossum; Geert De Blust; Martin Hermy; Ludwig Triest
Natuur.Focus | 2016
H Jacquemyn; Rein Brys; T Ceulemans; Wouter Van Landuyt
Natuur.Focus | 2016
H Jacquemyn; Rein Brys; T Ceulemans; Wouter Van Landuyt
Natuur.Focus | 2015
Guy Vranckx; H Jacquemyn; Karen Cox; Joachim Mergeay; Bart Muys; O. Honnay