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Floral Color and Family Drive Contrasting Plant–Pollinator Responses to Nutrient Enrichment
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Floral Color and Family Drive Contrasting Plant–Pollinator Responses to Nutrient Enrichment
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Journal Article
Floral Color and Family Drive Contrasting Plant–Pollinator Responses to Nutrient Enrichment
2025
Overview
Nutrient enrichment has decreased the diversity and abundance of wildflower species, raising questions about whether nutrient enrichment can further decrease the diversity and abundance of pollinators that rely on wildflowers. Whether the effects of nutrient enrichment on plant–pollinator interactions differ by nutrient type remains an open question. Moreover, plant family and flower color, two core axes of pollination niches, may further mediate how wildflowers and their pollinators respond to nutrient enrichment. We tested these questions using a nutrient addition experiment replicated at three grasslands in California, a global plant diversity hotspot. We found that adding nitrogen increased the floral abundance of Asteraceae, while decreasing that of Fabaceae, Geraniaceae, Iridaceae, and Euphorbiaceae. Adding phosphorus and potassium in the absence of nitrogen produced the opposite effects. Pollinator abundance and composition varied strongly by floral family, suggesting that these differing responses to nutrient addition by floral family may alter pollinator community composition. Nitrogen addition decreased the abundance of native blue, native green, and exotic pink flowers, while increasing the abundance of native and exotic yellow and exotic purple flowers. Consequently, nitrogen addition increased pollinator abundance on purple flowers, while decreasing pollinator abundance on pink flowers. Purple and yellow Asteraceae species, which increased under nitrogen enrichment, acted as core hubs in structuring the plant–pollinator network. Synthesis: Our findings suggest that the type of nutrient, plant family, and flower color modulate how plant–pollinator interactions respond to eutrophication. Floral taxonomic family and color mediated how plant–pollinator reactions respond to nutrient enrichment. Nitrogen enrichment increased yellow and purple Asteraceae flowers and decreased pink, blue, and green flowers in Geraniaceae, Fabaceae, and Iridaceae. These shifts in floral colors and traits altered pollinator composition.
Publisher
John Wiley & Sons, Inc,Wiley
Subject
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