Using geometric morphometrics to disentangle Didymosphenia hullii and D. geminata (Bacillariophyceae) from Connecticut, USA, and two congeneric relatives [* Cross-Reference *]

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Khan-Bureau, Diba A.; Blanco, Saúl; Morales, Eduardo A.; Ector, Luc; Beauchene, Michael S.; Lewis, Louise A., 2023, "Using geometric morphometrics to disentangle Didymosphenia hullii and D. geminata (Bacillariophyceae) from Connecticut, USA, and two congeneric relatives [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.TOZXZX, LIST Open Repository, V1
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Description
Two morphologically similar populations of Didymosphenia were reported from the West Branch of the Farmington River, Connecticut, USA in 2014 and 2016. We described one of them as a new species, D. hullii. The other was observed subsequently in late 2016 and resembled D. geminata, but given the worldwide nuisance characteristic of this species, the identification required confirmation. In this work we used geometric morphometrics analysis to test for quantitative distinctions between the two Connecticut populations, along with two morphologically similar taxa from the literature, D. laticollis and D. pumila. We successfully separated the four entities and confirmed the identity of the second blooming diatom in the Farmington River, Connecticut, as D. geminata, which is the first confirmed report of this species for the state. We conclude that geometric morphometrics, in combination with features viewed with scanning electron microscopy and light microscopy, enhances the ability to distinguish among these morphologically similar species of Didymosphenia. We summarize these findings and pinpoint morphological distinctions that can be used to separate the taxa during routine light microscopy analyses. (2023-01-01)
***This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1080/09670262.2022.2068075 for the original and latest version of the dataset and data downloads*** (2026-06-19)
Subject Earth and Environmental Sciences
Keyword Benthic diatoms, brown algae, diatom, Didymosphenia, fine structure, invasive species, morphometrics, nuisance species, stalk-forming diatoms
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