Variation in natural frequency of stamens with different morphologies and its relationship to bee vibrations

Pereira Nunes, Carlos Eduardo, Nevard, Lucy, Montealegre-Z, Fernando and Vallejo-Marin, Mario (2021) Variation in natural frequency of stamens with different morphologies and its relationship to bee vibrations. Botanical Journal of the Linnean Society, 197 (4). pp. 541-553. ISSN 0024-4074

Full content URL: https://doi.org/10.1093/botlinnean/boab044

Documents
Variation in natural frequency of stamens with different morphologies and its relationship to bee vibrations
Authors' Accepted Manuscript
[img]
[Download]
[img]
Preview
PDF
Nunes et al_rev3_2021.pdf - Whole Document
Available under License Creative Commons Attribution 4.0 International.

296kB
Item Type:Article
Item Status:Live Archive

Abstract

During buzz pollination, bees use vibrations to remove pollen from flowers. Vibrations at the natural frequency of pollencarrying stamens are amplified through resonance, resulting in higher amplitude vibrations. Because pollen release depends on vibration amplitude, bees could increase pollen removal by vibrating at the natural frequency of stamens. However, few studies have characterized the natural frequencies of stamens and compared them to the frequencies of buzzpollinating bees. We use laser Doppler vibrometry to characterize natural frequencies of stamens of six morphologically diverse, buzz-pollinated, heterantherous Solanum taxa and compare the frequency of bumblebee buzzes produced on two Solanum spp. with different natural frequencies. We found that stamen morphology and plant identity explain variation in their natural frequency. The natural frequencies of the stamens in the studied Solanum taxa fell between 45 and 295 Hz; in five out of six taxa the frequencies were < 190 Hz, which only partly overlaps floral vibrations of buzzpollinating bees. We show that captive bumblebees produce vibrations at a frequency of 345 Hz and do not change their floral vibrations to match the natural frequency of the visited flowers. Our results suggest that pollen release induced by vibrating stamens at their natural frequencies might only play a role in a subset of buzz pollination interactions.

Keywords:biomechanics, Bombus terrestris, buffalo-bur, buzz pollination, flower diversity, nightshade, resonance, Solanaceae
Subjects:C Biological Sciences > C180 Ecology
C Biological Sciences > C770 Biophysical Science
C Biological Sciences > C200 Botany
Divisions:College of Science > School of Life Sciences
ID Code:48654
Deposited On:22 Mar 2022 12:11

Repository Staff Only: item control page