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Dimorphism in the Antarctic cryptophyte Geminigera cryophila (Cryptophyceae)


van den Hoff, J and Bell, E and Whittock, L, Dimorphism in the Antarctic cryptophyte Geminigera cryophila (Cryptophyceae), Journal of Phycology, 56, (4) pp. 1028-1038. ISSN 0022-3646 (2020) [Refereed Article]

Copyright Statement

© 2020 Phycological Society of America

DOI: doi:10.1111/jpy.13004


A pink to red‐pigmented cryptophyte of undetermined taxonomic affinity was isolated and cloned from two seasonally ice‐covered. meromictic, saline Antarctic aquatic environments: Bayly Bay (BB) and Ace Lake (AL). The clones shared a number of morphological and ultrastructural similarities with other cryptomonad genera, which confounded identification by light and electron microscopy. Cellular pigments extracted from the AL clone showed an absorption maximum corresponding to the biliprotein Cr‐phycoerythrin 545, thus narrowing its potential taxonomic affinities. Partial 18S SSU ribosomal gene sequences were isolated from both the AL and the BB cryptomonads’ nuclear rDNA, whereas PCR‐amplified and their molecular phylogenies inferred from the subject sequences. Our results, and the results of another study that used our prepublished sequence data, invariably resolved both clones as very close matches with the Antarctic cryptophyte, Geminigera cryophila. When combined, the morphological, chemical, and molecular evidence suggested that both of our cryptophyte clones were a cryptomorph of the G. cryophila campylomorph. Slight differences between the AL and BB nuclear tree reconstructions suggested divergent microevolution following long‐term isolation of the AL population from the surrounding marine ecosystem. This study provides further compelling evidence that certain Cryptophyceae engage in a life‐history strategy, which includes alternating morphologically distinct cell‐types (dimorphism); cell‐types which without molecular analyses could be mistaken as novel taxa.

Item Details

Item Type:Refereed Article
Keywords:campylomorph, Cr-phycoerythrin 545, cryptomorph, meromictic, morphology, phylogeny, rDNA, Teleaulax
Research Division:Biological Sciences
Research Group:Evolutionary biology
Research Field:Animal systematics and taxonomy
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Biodiversity in Antarctic and Southern Ocean environments
UTAS Author:Whittock, L (Dr Lucy Whittock)
ID Code:143189
Year Published:2020
Web of Science® Times Cited:8
Deposited By:Ecology and Biodiversity
Deposited On:2021-03-04
Last Modified:2021-11-19

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