Pollination Dynamics in Cucurbit Crop Ecosystems

Cucurbit crops, including pumpkins, squashes and melons, depend almost entirely on animal vectors to transfer pollen between separate male and female flowers. Their large, often brightly coloured and scented blooms have evolved to attract a diverse assemblage of pollinators, from specialist “squash bees” to generalist bumble bees and honey bees. Effective pollination underpins fruit set, seed quality and marketable yield, yet is vulnerable to habitat conversion, agrochemical regimes and seasonal changes in pollinator communities. Floral traits such as pigment composition and volatile profiles act as signals that mediate interactions with both beneficial pollinators and unwanted florivores. At the field scale, the timing of bloom and the availability of alternative floral resources can enhance or constrain pollination, while at the landscape scale the extent of semi-natural habitat influences the abundance and diversity of wild pollinators. Managing these variables through habitat restoration, floral resource provisioning and tailored cropping systems offers routes to bolster pollination services, increase resilience to pollinator declines and secure the global production of cucurbit crops.

Research from Nature Portfolio

Recent studies have demonstrated the critical role of wild bumble bees in delivering pollen to pumpkin flowers, even where honey bees are numerically dominant. Analyses of farming intensity and landscape composition revealed that a modest increase in cropland proportion can significantly reduce pollen deposition, with each 10 % rise in arable area resulting in a 7 % drop in pollen delivered by bumble bees. These findings underscore the need to maintain or restore non-crop habitats within intensively managed agricultural landscapes to preserve effective pollination and crop yield in cucurbit systems.

Pollination Dynamics in Cucurbit Crop Ecosystems publication trend

The graph below shows the total number of articles in pollination dynamics in cucurbit crop ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Staminate flower: A male flower bearing stamens that produce and release pollen.

Pistillate flower: A female flower containing a pistil with a receptive stigma for pollen capture.

Oligolectic pollinator: A specialist bee or insect species that collects pollen from a narrow range of plant taxa.

Generalist pollinator: An insect species that visits a wide variety of flowering plants to obtain nectar and pollen.

Pollen deposition: The transfer and adhesion of pollen grains onto the stigma of a flower, initiating fertilisation.

References

1. A review on floral scents and pigments in cucurbits: Their biosynthesis and role in flower visitor interactions. Scientia Horticulturae (2023).
2. Cucurbits as a model system for crop pollination management. Journal of Pollination Ecology (2019).
3. Use of video surveillance to measure the influences of habitat management and landscape composition on pollinator visitation and pollen deposition in pumpkin (Cucurbita pepo) agroecosystems. PeerJ (2015).
4. On-Farm Diversification in an Agriculturally-Dominated Landscape Positively Influences Specialist Pollinators. Frontiers in Sustainable Food Systems (2019).
5. Temporal variation in pollination services to Cucurbita moschata is determined by bee gender and diversity. Ecosphere (2018).
6. Dominance of cropland reduces the pollen deposition from bumble bees. Scientific Reports (2018).