Molecular analyses resolve the phylogenetic position of<i>Polysiphonia adamsiae</i>(Rhodomelaceae, Rhodophyta) and reveal a strong phylogeographic structure in Australia

Díaz‐Tapia, Pilar; Pasella, Marisa M.; Verbruggen, Heroen

doi:10.2216/18-36.1

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…These lineages were not placed as sister in our tree, but their phylogenetic relationships remained unresolved. Previous studies using different taxon selection placed these two clades either as sister lineages or paraphyletic with respect to the tribe Streblocladieae, as is the case in our Figure 1 (Bustamante et al., 2015; Díaz‐Tapia, Pasella, & Verbruggen, 2018; Díaz‐Tapia, Tüney‐Kizilkaya, & Taşkin, 2022; Huisman et al., 2017; Savoie & Saunders, 2019). Moreover, the relationships of a representative species of each of these clades were resolved as monophyletic using a phylogenomic approach (Díaz‐Tapia, Maggs, West, & Verbruggen, 2017).…”

Section: Discussionsupporting

confidence: 71%

“…The circumscription of Polysiphonia has been deeply modified in recent years, and integrative studies based on molecular and morphological investigations have led to the segregation or redefinition of two tribes and 18 genera (Amos et al., 2021; Díaz‐Tapia, Maggs, McIvor, et al., 2017; Díaz‐Tapia, Maggs, West, & Verbruggen, 2017; Savoie & Saunders, 2016, 2019; Wynne, 2018). Despite recent efforts and substantial advances, the current concept of Polysiphonia still consists of two distinct lineages that are resolved either as paraphyletic or monophyletic groups in phylogenies using different markers and taxon selection (Bustamante et al., 2015; Díaz‐Tapia, Pasella, & Verbruggen, 2018; Díaz‐Tapia, Tüney‐Kizilkaya, & Taşkin, 2022; Huisman et al., 2017). One of them includes the generitype P. stricta and another 11 Polysiphonia species.…”

Section: Introductionmentioning

confidence: 99%

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Resolving the taxonomy of thePolysiphonia scopulorumcomplex and theBryocladialineage (Rhodomelaceae, Rhodophyta)

Díaz‐Tapia,

Verbruggen

2023

Journal of Phycology

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Cryptic diversity is common among marine macroalgae, with molecular tools leading to the discovery of many new species. To assign names to these morphologically similar species, the type and synonyms have to be examined, and if appropriate, new species must be described. The turf‐forming red alga Polysiphonia scopulorum was originally described from Rottnest Island, Australia, and subsequently widely reported in tropical and temperate coasts based on morphological identifications. A recent study of molecular species delineation revealed a complex of 12 species in Australia, South Africa, and Europe. These species are placed in a taxonomically unresolved lineage of the tribe Polysiphonieae. The aim of this study was to resolve the genus‐ and species‐level taxonomy of this complex and related species using molecular and morphological information. Three morphologically indistinguishable species of the complex were found at the type locality of P. scopulorum, preventing a straightforward assignment of the name to any of the molecular lineages. Therefore, we propose a molecularly characterized epitype. Polysiphonia caespitosa is reinstated for the only species found in its type locality in South Africa. We describe seven new species. Only one species of the complex can be morphologically recognized, with the other eight species indistinguishable based on morphometric analysis. The studied complex, together with another seven species currently placed in Polysiphonia and two Bryocladia species, formed a clade distinct from Polysiphonia sensu stricto. Based on observations of Bryocladia cervicornis (the generitype), we describe our seven new species in the genus Bryocladia and transfer another nine species from Polysiphonia to Bryocladia.

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Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Resolving the taxonomy of thePolysiphonia scopulorumcomplex and theBryocladialineage (Rhodomelaceae, Rhodophyta)

Díaz‐Tapia,

Verbruggen

2023

Journal of Phycology

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“…Lophurella. (Womersley, 2003;Waters, 2008;Díaz-Tapia et al, 2018b). The absence of Lophurella in northern Tasmania, as well as the origin of its diversity and the present distribution of the species that we found in southeastern Australia and Tasmania might be related to the combination of palaeogeographical events and contemporary currents in this region.…”

Section: Discussionmentioning

confidence: 66%

Reassessment of the genus Lophurella (Rhodomelaceae, Rhodophyta) from Australia and New Zealand reveals four cryptic species

Díaz‐Tapia

Maggs

Nelson

et al. 2019

European Journal of Phycology

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Cryptic diversity is common in the red algae and is often discovered when comparing specimens from distant locations or different morphotypes of species with high phenotypic plasticity. The genus Lophurella includes seven species from the coldtemperate coasts of the Southern Hemisphere. Lophurella. periclados is the only species reported from Australia where two morphotypes were identified in relation to levels of wave exposure. In New Zealand, three species of Lophurella have been reported-the endemic L. caespitosa (type locality Parimahu, North I. New Zealand), L. hookeriana (type locality Cape Horn, South America) and L. periclados. We reassessed species diversity of Lophurella in Australia and New Zealand with the aim of determining (1) whether New Zealand and South American specimens of L. hookeriana actually represent a single species, and (2) if the morphotypes of L. periclados mask cryptic diversity. We studied rbcL sequences and morphological features of 36 specimens identified as L. periclados, one specimen of L. caespitosa, and five samples of L. hookeriana, three from New Zealand and two from Cape Horn. Molecular analyses revealed that L. hookeriana from New Zealand and South America are distinct species and the new species L. pauciramulosa is described from New Zealand. Lophurella. periclados is a complex involving four species and we propose three new species, L. mutabilis, L. nigra and L. tasmanica. Cryptic diversity in L. periclados did not align with the previously defined ecotypes and several species were often found at the same site. Lophurella. periclados, L. nigra and L. tasmanica can be distinguished by morphological characters. Conversely, L. mutabilis has high morphological plasticity, with characters that overlap with L. periclados and L. nigra, and can be only distinguished by DNA sequences.

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“…glacialis from NW Alas-cox3), and nuclear ITS2 rDNA sequences (Kawai et al 2015b, figs 1-3). Shared genes with identical sequences in algal, plant and animal taxa are commonplace (Campagna et al 2017, Díaz-Tapia et al 2017, Leonard 2017, Páll-Gergely 2017, Augyte et al 2018, a central evolutionary theme of the biota in the fluctuating past environments of the N Atlantic Ocean and N Polar Sea.…”

Section: Methodsmentioning

confidence: 99%

“…There is little value in the repression of long-standing previous biological results as systematic criteria (Nilsson et al 2006, Augyte et al 2018, Ledford 2018. Gross and cryptic biological features compliment use and value of genetic protocol (Lane et al 2006, Nilsson et al 2006, Mann 2010, Hu et al 2012, Leliaert et al 2014, Campagna et al 2017, Díaz-Tapia et al 2017, Leliaert and De Clerck 2017, Páll-Gergely 2017. We recognize similarity of core Halosiphon Clade genes, especially in Pl.…”

Section: Methodsmentioning

confidence: 99%

<italic>Platysiphon verticillatus</italic> and <italic>Arcticophycus glacialis</italic>: gen. et comb. nov. (Stschapoviales, Phaeophyceae) based on ecological considerations, life history, morphology, and ultrastructure

Wilce¹,

Bradley²

2019

ALGAE

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Platysiphon verticillatus and Punctaria glacialis are synonymized by mainly on the basis of shared genes, nine identical sequences. Our hypothesis is that synonymy is erroneous. We posit the many differences of biological features between the two species, their ecological preferences, and occurrences do not support synonymy. Arcticophycus (nov. gen.) is described and contains the new combination Arcticophycus glacialis. Asexual, vegetative, life histories are proposed. Novel reproductive structures are described including previously unknown features of thallus development in the life history of both species. Discovery of the novel Platysiphon cyst, and dual sporangia types in Arcticophycus, is critical in establishing a probable strategy for survival through the Arctic winter for each annual species. Pl. verticillatus is erect, tubular, ovoid to circular in X sections, flaccid, non-parenchymatous, light brown, 10-15 cm high with distinctive photosynthetic hairs in clusters or whorled on the upper one third of the thallus. A. glacialis is erect, planar, robust, parenchymatous, dark brown and hairs absent. The Halosiphon clade is named, consisting of four genera: Halosiphon, Platysiphon, Arcticophycus, and Stschapovia. Occurrence of these genera is identified. Emended are the genus Platysiphon, the family Platysiphonaceae and the order Stschapoviales.

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Molecular analyses resolve the phylogenetic position ofPolysiphonia adamsiae(Rhodomelaceae, Rhodophyta) and reveal a strong phylogeographic structure in Australia

Cited by 11 publications

References 29 publications

Resolving the taxonomy of thePolysiphonia scopulorumcomplex and theBryocladialineage (Rhodomelaceae, Rhodophyta)

Resolving the taxonomy of thePolysiphonia scopulorumcomplex and theBryocladialineage (Rhodomelaceae, Rhodophyta)

Reassessment of the genus Lophurella (Rhodomelaceae, Rhodophyta) from Australia and New Zealand reveals four cryptic species

<italic>Platysiphon verticillatus</italic> and <italic>Arcticophycus glacialis</italic>: gen. et comb. nov. (Stschapoviales, Phaeophyceae) based on ecological considerations, life history, morphology, and ultrastructure

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