Cryptic diversity in the genus <i>Croisettea</i> (Kallymeniaceae, Rhodophyta) from Hawaiian mesophotic reefs

Cabrera, Feresa P.; Huisman, John M.; Spalding, Heather L.; Kosaki, Randall K.; Smith, Celia M.; Sherwood, Alison R.

doi:10.1080/00318884.2022.2096823

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…Currently, the Hawaiian gigartinalean red blade taxa show a pronounced affinity toward cold‐water habitats and geographic regions, as indicated by their exclusive occurrence in mesophotic depths. This trend is supported by the observation of mesophotic‐exclusive connections in various Hawaiian endemic algal species, such as Psaromenia and Croisettea (Cabrera, Huisman, Spalding, Kosaski, & Sherwood, 2022; Cabrera, Huisman, Spalding, Kosaski, Smith, et al, 2022). This affinity aligns with the findings of McDermid and Abbott (2006), who shed light on deep subtidal marine plants from PMNM, providing broader insights into biogeography.…”

Section: Discussionmentioning

confidence: 77%

“…Blade morphology comparisons reveal widespread cryptic diversity among red blades in the genera Halopeltis , Leptofauchea , and Rhodymenia , which are very similar to Anunuuluaehu in terms of vegetative anatomy but distinctly different in gametangial and tetrasporangial reproductive structures (Alvarado et al., 2022; Cabrera, Huisman, Spalding, Kosaki, & Sherwood, 2022; Cabrera, Huisman, Spalding, Kosaki, Smith, et al., 2022). Anunuuluaehu stands out as a morpho‐anatomically distinct genus within the Phyllophoraceae, characterized by its unique, branching, obcordate blades with a pronounced furrow at the center of the apices and long post‐fertilization gonimoblast filaments.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the discovery of a cold‐water brown alga, Desmarestia ligulata , in the mesophotic region of the PMNM further supports the significance of cold‐water associations within Hawai‘i's mesophotic ecosystems (Abbott & Huisman, 2003). The adaptation of red blades to the extreme conditions of Hawaiian reef systems, such as cold temperatures and light limitation in the lower mesophotic depths (approximately 90 m), represents a remarkable feat (Cabrera, Huisman, Spalding, Kosaski, & Sherwood, 2022, Cabrera, Huisman, Spalding, Kosaski, Smith, et al, 2022). Although mesophotic macroalgal communities have been observed in various regions around the world facing similar challenges, the adaptation of this new genus and species to the unique conditions found in Hawaiian MCEs is worth noting.…”

Section: Discussionmentioning

confidence: 99%

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Organellar genomic characterization of Anunuuluaehu liula representing a new genus and species of Phyllophoraceae (Gigartinales, Rhodophyta) from the mesophotic zone of Hawai‘i

Cabrera,

Paiano,

Fumo

et al. 2024

Journal of Phycology

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Over the last 2 decades, routine collections in the Hawaiian Archipelago have expanded to mesophotic reefs, leading to the discovery of a new red algal genus and species, here described as Anunuuluaehu liula gen. et sp. nov. This study provides a detailed genus and species description and characterizes chloroplast and mitochondrial organellar genomes. The new genus, Anunuuluaehu, shares many characteristics with the family Phyllophoraceae and shows close similarities to Archestennogramma and Stenogramma, including habit morphology, nemathecia forming proliferations at the outer cortex with terminal chains of tetrasporangia, and carposporophytes with multi‐layered pericarps. The single species in this genus exhibits distinctive features within the Phyllophoraceae: the presence of single‐layer construction of large medullary cells and the development of long, tubular gonimoblastic filaments. Multi‐gene phylogenetic analyses confirmed it as a unique, monophyletic lineage within the family. Cis‐splicing genes, interrupted by intron‐encoded proteins within group II introns, are present in both the chloroplast and mitochondrial genomes of A. liula. Notably, a specific region of the coxI group II intron exhibits similarity to fungal introns. Anunuuluaehu liula is presumed to be endemic to the Hawaiian Archipelago and thus far is known to live solely at mesophotic depths from Hōlanikū to Kaho‘olawe ranging from 54 to 201 m, which is the deepest collection record of any representative in the family. Overall, this study enhances our understanding of the genomic and taxonomic complexities of red algae in mesophotic habitats, emphasizing the significance of continued research in this area to uncover further insights into evolutionary processes and biogeographic patterns.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Organellar genomic characterization of Anunuuluaehu liula representing a new genus and species of Phyllophoraceae (Gigartinales, Rhodophyta) from the mesophotic zone of Hawai‘i

Cabrera,

Paiano,

Fumo

et al. 2024

Journal of Phycology

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“…Due to the unique nature of these lineages and to further the named diversity in the Cladophorales plus the difficulty of collection in some of these locations, we propose names based on these genetically unique samples. Naming species and genera based on single or few specimens from hard to access locations is useful for cataloging diversity (Cabrera et al, 2022; Schneider et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

Hidden diversity in high‐latitude Southern Hemisphere environments: Reinstatement of the genus Rama and description of Vandenhoekia gen. nov. (Cladophoraceae, Ulvophyceae, Chlorophyta), two highly variable genera

Boedeker,

Wynne,

Zuccarello

2023

Journal of Phycology

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The continental coasts and remote islands in the high‐latitude Southern Hemisphere, including the subantarctic region, are characterized by many endemic species, high abundance of taxa, and intermediate levels of biodiversity. The macroalgal flora of these locations has received relatively little attention. Filamentous green algae are prolific in the intertidal of southern islands, but the taxonomy, distribution, and evolutionary history of these taxa are yet to be fully explored, mostly due to the difficulty of access to some of these locations. In this study, we examined specimens of the order Cladophorales from various locations in the high‐latitude Southern Hemisphere including the subantarctic (the Auckland Islands, Bounty Islands, Campbell Island, Macquarie Island, and Kerguelen Islands), as well as mainland New Zealand, the Chatham Islands, Chile, and Tasmania. The analyses of the rDNA sequences of the samples revealed the existence of two new clades in a phylogeny of the Cladophoraceae. One of these clades is described as the novel genus Vandenhoekia gen. nov., which contains three species that are branched or unbranched. The amended genus Rama is reinstated to accommodate the other clade, and contains four species, including the Northern Hemisphere “Cladophora rupestris.” In Rama both branched and unbranched morphologies are found. It is remarkable that gross morphology is not a predictor for generic affiliations in these algae. This study illustrates that much can still be learned about diversity in the Cladophorales and highlights the importance of new collections, especially in novel locations.

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“…2016) Further, several algal species unique to Hawaiian MCEs lacking shallow water representation have been described in recent years (Alvarado et al . 2022; Cabrera et al . 2022; Paiano et al .…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of Amansia glomerata C.Agardh (Ceramiales, Rhodomelaceae) in Hawai‘i: A Single Species with High Divergence

Fumo

Sherwood

2023

Cryptogamie, Algologie

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Algal biogeography in Hawai'i has not been studied in detail for many species. The islands are home to swift-current deep-water channels separating suitable habitats. The ability of these channels to act as barriers to dispersal has been studied in several animal lineages and is assessed here using the widespread red alga Amansia glomerata C.Agardh. A variety of analytical techniques based on 129 mitochondrial COI barcoding sequences collected across c. 2500 km were used to assess the genetic diversity of A. glomerata in Hawai'i. Haplotype network analyses demonstrated that the species is split into four main lineages which overlap in large parts of their range, yet there is insufficient support to recognize the lineages as separate species. Measures of haplotype diversity, nucleotide diversity, and neutrality tests suggest that at least three of these lineages have undergone recent population expansion. Biogeographic barriers were found to largely match those of marine animal groups in the archipelago. No evidence was found for distinct haplotypes or lineages between shallow and mesophotic reefs. A number of potential collection locations are suggested for the 1822 lectotype of the species, which was included in the molecular analyses. Potential scenarios leading to observed diversity patterns in the archipelago are presented. Amansia glomerata exhibits a high degree of haplotypic variation in Hawai'i, suggesting it may exhibit vast molecular divergences across its broader range, which extends from Hawai'i to southeastern Africa.

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Cryptic diversity in the genus Croisettea (Kallymeniaceae, Rhodophyta) from Hawaiian mesophotic reefs

Cited by 6 publications

References 39 publications

Organellar genomic characterization of Anunuuluaehu liula representing a new genus and species of Phyllophoraceae (Gigartinales, Rhodophyta) from the mesophotic zone of Hawai‘i

Organellar genomic characterization of Anunuuluaehu liula representing a new genus and species of Phyllophoraceae (Gigartinales, Rhodophyta) from the mesophotic zone of Hawai‘i

Hidden diversity in high‐latitude Southern Hemisphere environments: Reinstatement of the genus Rama and description of Vandenhoekia gen. nov. (Cladophoraceae, Ulvophyceae, Chlorophyta), two highly variable genera

Phylogeography of Amansia glomerata C.Agardh (Ceramiales, Rhodomelaceae) in Hawai‘i: A Single Species with High Divergence

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