Well, purely as speculation: perhaps their opening times coincide with peak activity of a particular pollinator and opening at other times is detrimental due to 'thief' pollinators taking advantage.
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Well, purely as speculation: perhaps their opening times coincide with peak activity of a particular pollinator and opening at other times is detrimental due to 'thief' pollinators taking advantage.
That is possible, it is also possible that atmospheric or climatic conditions need to be right for pollination to occur