Plant Ecology and Evolution 152(2): 327-339, doi: 10.5091/plecevo.2019.1619
On the identity of the rare Fragilaria subconstricta (Fragilariaceae), with Fragilaria species forming ribbon-like colonies shortly reconsidered
expand article infoDavid Heudre‡, Carlos E. Wetzel§, Laura Moreau‡, Bart Van de Vijver|, Luc Ector
‡ Direction Régionale de l’Environnement, de l’Aménagement et du Logement Grand Est, 2 rue Augustin Fresnel, CS 57071 Metz cedex 03, France§ Environmental Research and Innovation Department (ERIN) Institute of Science and Technology (LIST), 41 rue du Brill, 4422 Belvaux, Luxembourg| Botanic Garden Meise, Meise, Belgium¶ Luxembourg Institute of Science and Technology, Belvaux, Luxembourg

Corresponding author: David Heudre ( david.heudre@developpement-durable.gouv.fr )

© David Heudre, Carlos E. Wetzel, Laura Moreau, Bart Van de Vijver, Luc Ector.
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: Heudre D, Wetzel CE, Moreau L, Van de Vijver B, Ector L (2019) On the identity of the rare Fragilaria subconstricta (Fragilariaceae), with Fragilaria species forming ribbon-like colonies shortly reconsidered. Plant Ecology and Evolution 152(2): 327-339. https://doi.org/10.5091/plecevo.2019.1619
Open Access
Abstract

Background and aims – During phytoplankton surveys of a freshwater pond in Northeastern France, Fragilaria subconstricta (Bacillariophyceae) was observed. This rare diatom was present in large numbers in several plankton samples from Lachaussée Pond in the French Grand Est region.

Methods – The morphology of Fragilaria subconstricta was examined in detail using light and scanning electron microscopy. Its identity is discussed and it is compared to the morphologically most similar species, especially Fragilaria capucina, F. mesolepta Rabenhorst, F. neointermedia and F. tenuistriata.

Key results – Fragilaria subconstricta produces ribbon-like colonies and has narrow linear-lanceolate valves with slightly rostrate ends. The central area is rectangular, usually small or even absent. Spatulate linking spines are present all along the valve margins and a single rimoportula is located near one apex at the valve face-mantle junction. An amended diagnosis and new synonyms are proposed for this species. Additionally, the type material of Fragilaria mesolepta and a population of the very rare species Fragilaria capucina have been investigated and illustrated.

Conclusions – Fragilaria subconstricta and F. tenuistriata are synonyms. Fragilaria capucina s. str. is a rare species in Europe, and the majority of records for this species should be considered part of the Fragilaria capucina “Sippenkomplex” sensu Krammer & Lange-Bertalot (1991).

Keywords
Bacillariophyta, Fragilaria subconstricta, Fragilaria capucina, taxonomy, scanning electron microscopy

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