Flowers, phenology and pollination of the endemic New Zealand greenhood orchidPterostylis brumalis
| Autor: | Jacqueline R. Beggs, Richard J. Toft, EJ Bodley, Anne C. Gaskett |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Orchidaceae Herbivore Pollinium Pollination Phenology media_common.quotation_subject Pterostylis brumalis Plant Science Insect Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Pollinator Botany Ecology Evolution Behavior and Systematics 010606 plant biology & botany media_common |
| Zdroj: | New Zealand Journal of Botany. 54:291-310 |
| ISSN: | 1175-8643 0028-825X |
| Popis: | Greenhood orchids are most diverse in New Zealand and Australia, with at least some species pollinated by sexual deception of male fungus gnats. Preliminary investigation of endemic New Zealand Pterostylis brumalis via field phenology, hand-pollination and insect trapping revealed P. brumalis is self-compatible but relies on insects for cross pollination. Natural fruit-set was low, averaging 2.6% across two populations. High fruit-set in hand-pollinated flowers (66.7%) indicates severe pollinator limitation. In comparison, only one collected insect, a female Mycetophila vulgaris, bore orchid pollinia. Potential pollinator attractants (colour and scent) were analysed. UV reflectance may enhance pollinator detection of the flower against the background, but visual modelling generated conflicting results: a categorical fly vision model indicated excellent camouflage against herbivory, but a generic tetrachromat vision model suggested flowers are easily distinguishable against the background. Both mod... |
| Databáze: | OpenAIRE |
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