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Issue: Vol. 635 No. 3: 26 Jan. 2024
Type: Article
Published: 2024-01-26
DOI: 10.11646/phytotaxa.635.3.1
Page range: 191-205
Abstract views: 242
PDF downloaded: 171

Contribution to the knowledge of Gongolaria barbata (Sargassaceae, Fucales) from the Mediterranean: insights into infraspecific diversity

Department of Life Sciences, University of Trieste – Trieste, Italy.
Department of Life Sciences, University of Trieste – Trieste, Italy.
Dept. of Biological, Geological and Environmental Sciences – University of Catania, Italy.
Department of Life Sciences, University of Trieste – Trieste, Italy.
Department of Life Sciences, University of Trieste – Trieste, Italy.
Department of Life Sciences, University of Trieste – Trieste, Italy.
Department of Life Sciences, University of Trieste – Trieste, Italy.
Marine Biology Station Piran, National Institute of Biology, Piran, Slovenia.
IMC—International Marine Centre, Oristano, Italy.
Dept. of Biological, Geological and Environmental Sciences – University of Catania, Italy.
ecotypes taxonomy Northern Adriatic Cystoseira s.l Algae

Abstract

Gongolaria barbata (Sargassaceae, Fucales) is a widespread species for which several infraspecific taxa have been described, indicating its polymorphism. This study contributes to the understanding of the molecular, nomenclatural, morphological and ecological aspects of G. barbata in the Mediterranean and sheds light on the infraspecific diversity and its implications for the taxonomy of this species. Molecular analyses were performed using sequencing of the mitochondrial cox1 gene on both haptophytic and pleustophytic forms from different sites in the Adriatic and Tyrrhenian Seas. Vegetative and reproductive morphology was studied on thalli samples from the Adriatic. Our results showed that there are different morphotypes within G. barbata populations related to specific environmental conditions, suggesting infraspecific variation. In contrast, molecular analyses showed no differences between samples, regardless of whether individuals are growing “attached” to a substrate or “unattached”. We also discussed the taxonomic status and nomenclatural issues related to certain infraspecific taxa previously proposed for G. barbata. In particular, the confusion surrounding Cystoseira aurantia is clarified.

 

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