Settling velocity and pollination dynamics in Diarrhena obovata, a grass of temperate forest edges and understories

Authors

DOI:

https://doi.org/10.26786/1920-7603(2022)683

Keywords:

Settling Velocity, terminal velocity, Poaceae, Pollen, Anemophily

Abstract

Pollen from a naturally occurring population of the forest grass species Diarrhena obovata was successfully captured in a series of pollen traps to understand the timing of anthesis and the dispersal mechanics of wind pollination in an example of the flowering plant family Poaceae. Scanning electron microscopy was used to identify the pollen surface ornamentation as microechinate-areolate. The spherical grains have a diameter of 38.74 μm. The settling velocity calculated by Stoke’s Law was 4.48 cm s-1, but physical measurement by drop tower experiments resulted in 3.77 ± 0.15 cm s-1 (sd). The surface ornamentation observed in D. obovata pollen is not expected to alter drag forces considerably but the reduction of settling velocity may be a result of species-specific pollen grain density.  In forest grasses an improvement in settling velocity may be adaptive in overcoming dispersal constraints in an environment where trees obstruct wind speeds and create more turbulence.

Author Biography

Phillip Klahs, Iowa State University

 

 
inflorescence of Diarrhena obovata

Additional Files

Published

2022-07-12

How to Cite

Klahs, P. (2022). Settling velocity and pollination dynamics in Diarrhena obovata, a grass of temperate forest edges and understories. Journal of Pollination Ecology, 31, 73–86. https://doi.org/10.26786/1920-7603(2022)683

Issue

Section

Early View