Apr 21, 2014

Characterization of Salix nigra floral insect community and activity of three native Andrena bees

BioRxiv : the Preprint Server for Biology
Alexander GusevAlkes L Price


Salix nigra (black willow) is a widespread tree that hosts many species of polylectic hymenopterans and oligolectic bees of the genus Andrena. The early flowering time of S. nigra makes it an important nutritive resource for arthropods emerging from hibernation. However, since S. nigra is dioecious, not all insect visits will lead to successful pollination. Using both visual observation and pan-trapping we characterized the community of arthropods that visited S. nigra flowers and assessed the differences among male and female trees as well as the chemical and visual drivers that influenced community composition across three years. We found that male trees consistently supported higher diversity of insects than female trees and only three insect species, all Andrena spp. , consistently visited both sexes. Additionally, A. nigrae , which was the only insect that occurred more on female than male flowers, correlated strongly to volatile cues. This suggests that cross-pollinators cue into specific aspects of floral scent, but diversity of floral visitors is driven strongly by visual cues. Through time the floral activity of two Andrena species remained stable, but A. nigrae visited less in 2017 when flowers bloomed earlier than ot...Continue Reading

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Mentioned in this Paper

Genome-Wide Association Study
Deoxyhypusine synthase
Dysequilibrium Syndrome
Drug Hypersensitivity Syndrome
Single Nucleotide Polymorphism

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