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Mechanisms and evolution of deceptive pollination in orchids
Jana Jersáková1, Steven D Johnson, Pavel Kindlmann
1School of Biological and Conservation Sciences, University of KwaZulu-Natal, Private Bag X01, Pietermaritzburg, 3209, South Africa.
Summary
Orchids often use deceptive pollination strategies instead of rewards, a puzzle in evolutionary biology. Deception may enhance fitness by promoting cross-pollination, especially when pollinators are abundant.
Area of Science:
- Evolutionary Biology
- Botany
- Ecology
Background:
- Orchids exhibit remarkable diversity in pollination mechanisms, with a high incidence of non-rewarding flowers compared to other plant families.
- Mechanisms of deception include generalized food deception, mimicry, and sexual deception, with generalized food deception being the most prevalent.
Purpose of the Study:
- To investigate the evolutionary puzzle of why non-rewarding flowers (deception) are common in orchids.
- To explore hypotheses explaining the prevalence and fitness benefits of floral deception in orchids.
Main Methods:
- Literature review of studies on orchid pollination mechanisms and deception.
- Analysis of hypotheses related to resource allocation, cross-pollination, and pollinator behavior in deceptive orchids.
Main Results:
- Deception is hypothesized to increase fitness through resource reallocation and enhanced cross-pollination.
- While deception promotes cross-pollination, evidence for generally higher outcrossing rates in deceptive orchids is lacking.
- Deceptive orchids do not show higher genetic load than rewarding ones, suggesting similar outcrossing rates.
Conclusions:
- Floral deception in orchids is linked to increased seed quality and potential for greater pollen export.
- Deception is most beneficial when pollinators are abundant, while rare pollinators may favor nectar rewards or self-pollination.
- Understanding why deception is an evolutionarily stable strategy in orchids requires further investigation, especially considering its likely ancestral state.
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