Tagged: dioecious

Image of Derelomus chamaeropsis adult on male inflorescence.

Inflorescence arrangement and nursery pollinator occupancy

Nursery pollination systems are excellent biological models to study how obligated plant-insect mutualisms function and have evolved. Jácome-Flores et al. investigated whether and how the spatial distribution, sex, and flowering synchrony of Chamaerops humilis (Arecaceae) relates to host occupancy by the larvae of its pollinator, the palm flower weevil, Derelomus chamaeropsis (Coleoptera). Interestingly, the remarkable dispersal ability of D. chamaeropsis rather than the host plant spatial distribution (highly aggregated) was the primary determinant of pollinator occupancy. Jácome-Flores et al. also reveal new costs and benefits of such interaction, where flowering synchrony and a high inflorescence number appeared to reduce the...

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Ceratodon purpureus

Sex-specific morphology and physiology in Ceratodon purpureus

Separate sexes and biased sex ratios are common in bryophytes, yet little is known about how fine-scale, sex-specific morphological traits are correlated with physiology and population sex-ratios. Slate et al. analysed cellular, leaf, and canopy traits and photochemical measurements in the dioecious moss Ceratodon purpureus. Male and female plants differed in cell, leaf and photochemical measures. These sexual dimorphisms were female biased, with females having larger and thicker leaves and greater values for chlorophyll fluorescence-based, leaf photochemistry measurements than males. Female traits were also more variable than male traits. Interestingly, field population sex ratios were significantly male biased in two...

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