Plant Ecology and Evolution 152(2): 351-357, doi: 10.5091/plecevo.2019.1598
Polymorphism in Mastogloia (Bacillariophyceae) revisited
expand article infoMark Edlund‡, David R.L. Burge§
‡ Science Museum of Minnesota, Marine on St. Croix, Minnesota, United States of America§ Water Resources Science, University of Minnesota, St. Paul, Minnesota, 55108, United States of America

Corresponding author: Mark Edlund ( medlund@smm.org )

© Mark B. Edlund, David R.L. Burge.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Edlund M, Burge DR.L (2019) Polymorphism in Mastogloia (Bacillariophyceae) revisited. Plant Ecology and Evolution 152(2): 351-357. https://doi.org/10.5091/plecevo.2019.1598
Open Access
Abstract

Background and aims – Mastogloia grevillei has been shown to be a polymorphic diatom species, producing frustules with morphology of Mastogloia grevillei, frustules with morphology of M. danseyi, and more rarely, heteromorphic or Janus cells with one valve of each morphology.

Methods – We investigated a wetland population from Iowa (USA) known to produce heteromorphic valves and the type material of Mastogloia grevillei and M. danseyi to clarify the nomenclature of this taxon.

Key results – The polymorphic shift in stria construction and density between Mastogloia grevillei and M. danseyi occurs in populations sampled decades apart, among widely separated populations, within single genotypes, and independent of sexual reproduction. Combining our observations with observations of type material for Mastogloia grevillei and M. danseyi we propose that Mastogloia danseyi f. grevillei stat. nov. be recognized as an ecophenotype of the nominate Mastogloia danseyi, as the latter taxon has nomenclatural priority. We also provide lectotypes for both taxa.

Conclusions – Variability in stria structure and density between the two taxa is discontinuous and represents a probable polyphenism for diatoms that is likely triggered by changing total dissolved solids, conductivity, and/or solutes.

Keywords
Bacillariophyta, diatoms, ecophenotype, Janus cells, morphological variation, nomenclature, phenotypic plasticity, polyphenism, taxonomy

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