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- W3024667908 abstract "Excessive pollen harvesting by bees can compromise the reproductive success of plants. Plants have therefore evolved different morphological structures and floral cues to narrow the spectrum of pollen feeding visitors. Among “filtering” mechanisms, the chemical and mechanical protection of pollen might shape bee-flower interactions and restrict pollen exploitation to a specific suite of visitors such as observed in Asteraceae. Asteraceae pollen is indeed only occasionally exploited by generalist bee species but plentifully foraged by specialist ones (i.e., Asteraceae paradox). During our bioassays, we observed that micro-colonies of generalist bumblebee (Bombus terrestris L.) feeding on Taraxacum pollen (Asteraceae) reduced their pollen collection and offspring production. Bees also experienced physiological effects of possible defenses in the form of digestive damage. Overall, our results suggest the existence of an effective chemical defense in Asteraceae pollen, while the hypothesis of a mechanical defense appeared more unlikely. Pre- and post-ingestive effects of such chemical defenses (i.e., nutrient deficit or presence of toxic compounds), as well as their role in the shaping of bee-flower interactions, are discussed. Our results strongly suggest that pollen chemical traits may act as drivers of plant selection by bees and partly explain why Asteraceae pollen is rare in generalist bee diets." @default.
- W3024667908 created "2020-05-21" @default.
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- W3024667908 date "2020-05-14" @default.
- W3024667908 modified "2023-09-30" @default.
- W3024667908 title "Asteraceae Paradox: Chemical and Mechanical Protection of Taraxacum Pollen" @default.
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- W3024667908 doi "https://doi.org/10.3390/insects11050304" @default.
- W3024667908 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7290674" @default.
- W3024667908 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32422920" @default.
- W3024667908 hasPublicationYear "2020" @default.
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