An appraisal of the genus Pyropia (Bangiales, Rhodophyta) from southern Africa based on a multi-gene phylogeny, morphology and ecology, including the description of Pyropia meridionalis sp. nov.

Reddy, Maggie M.; Clerck, Olivier De; Leliaert, Frédérik; Bolton, John J.

doi:10.1016/j.sajb.2019.12.027

Cited by 10 publications

(4 citation statements)

References 57 publications

(107 reference statements)

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“…is therefore not surprising that U. lacinulata would have been previously misidentified as U. rigida or U. lactuca based on morphology. More importantly, this reiterates the need for DNA confirmation of commercially important species (Reddy et al, 2018(Reddy et al, , 2020(Reddy et al, , 2023, as different species may perform better than others in culture (Fort et al, 2019). More recently, the identification of Ulva specimens commercially cultivated in Integrated Multi-Trophic Aquaculture (IMTA) in Portugal was carried out (Califano et al, 2020).…”

Section: Discussionmentioning

confidence: 90%

Resolving the identity of commercially cultivated Ulva (Ulvaceae, Chlorophyta) in integrated seaweed‐abalone aquaculture farms in South Africa

Bachoo,

Bolton,

Macey

et al. 2023

Journal of Phycology

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Species of Ulva have a wide range of commercial applications and are increasingly being recognized as promising candidates for integrated aquaculture. In South Africa, Ulva has been commercially cultivated in integrated seaweed‐abalone aquaculture farms since 2002, with more than 2000 tonnes of biomass cultivated per annum in land‐based paddle raceways. However, the identity of the species of Ulva grown on these farms remains uncertain. We therefore characterized samples of Ulva cultivated in five integrated multi‐trophic aquaculture farms (IMTA) across a wide geographical range and compared them with foliose Ulva specimens from neighboring seashores. The molecular markers employed for this study were the chloroplast‐encoded Ribulose‐1,5‐bisphosphate carboxylase oxygenase (rbcL), the Internal Transcribed Spacer (ITS) of the nuclear, and the chloroplast elongation factor tufA. All currently cultivated specimens of Ulva were molecularly resolved as a single species, U. lacinulata. The same species has been cultivated for over a decade, although a few specimens of two other species were also present in early South African IMTA systems. The name Ulva uncialis is adopted for the Ulva “Species A” by Fort et al. (2021), Molecular Ecology Resources, 22, 86) significantly extending the distribution range for this species. A comparison with wild Ulva on seashores close to the farms resulted in five new distribution records for South Africa (U. lacinulata, U. ohnoi, U. australis, U. stenophylloides, and U. aragoënsis), the first report of a foliose form of U. compressa in the region, and one new distribution record for Namibia (U. australis). This study reiterates the need for DNA confirmation, especially when identifying morphologically simple macroalgae with potential commercial applications.

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Section: Discussionmentioning

confidence: 90%

Resolving the identity of commercially cultivated Ulva (Ulvaceae, Chlorophyta) in integrated seaweed‐abalone aquaculture farms in South Africa

Bachoo,

Bolton,

Macey

et al. 2023

Journal of Phycology

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“…The present study is the first report of Py. saldanhae in South America, a species considered to be endemic to the west coast of South Africa and Namibia [ 73 , 74 , 75 ]. Genetic data show that Py.…”

Section: Discussionmentioning

confidence: 99%

“…saldanhae forms a well-supported clade with various species of the Falkland Islands and New Zealand, and the authors suggested that Py. saldanhae has speciated along the South African coasts after a Pleistocene-Pliocene west-to-east colonization event [ 75 , 76 ]. Actually, rafting-mediated transport along the Antarctic Circumpolar Current has been shown to favor macroalgae dispersal between isolated landmasses in the Southern Ocean [ 77 , 78 , 79 ].…”

Section: Discussionmentioning

confidence: 99%

More than What Meets the Eye: Differential Spatiotemporal Distribution of Cryptic Intertidal Bangiales

Cid‐Alda

Valdivia

Guillemin

2022

Plants

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Morphologically similar but genetically distinct species have been termed cryptic and most have been assumed to be ecologically similar. However, if these species co-occur at a certain spatial scale, some niche differences at finer scales should be expected to allow for coexistence. Here, we demonstrate the existence of a disjointed distribution of cryptic bladed Bangiales along spatial (intertidal elevations) and temporal (seasons) environmental gradients. Bladed Bangiales were identified and quantified across four intertidal elevations and four seasons for one year, at five rocky intertidal sites (between 39° S and 43° S) in southern Chile. Species determination was based on partial sequences of the mitochondrial cytochrome c oxidase 1 (COI) gene amplification. To assess species gross morphology, thallus shape, color, and maximum length and width were recorded. Hundreds of organisms were classified into nine Bangiales species belonging to three genera (i.e., Fuscifolium, Porphyra, and Pyropia), including five frequent (>97% of specimens) and four infrequent species. All species, except for Pyropia saldanhae, had been previously reported along the coasts of Chile. The thallus shape and color were very variable, and a large overlap of the maximum width and length supported the cryptic status of these species. Multivariate analyses showed that the main variable affecting species composition was intertidal elevation. Species such as Py. orbicularis were more abundant in low and mid intertidal zones, while others, such as Po. mumfordii and Po. sp. FIH, were principally observed in high and spray elevations. Despite all numerically dominant species being present all year long, a slight effect of seasonal variation on species composition was also detected. These results strongly support the existence of spatial niche partitioning in cryptic Bangiales along the Chilean rocky intertidal zone.

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“…2018). Details of the phylogenetic tree construction and genetic distance comparisons followed Reddy et al . (2020a) using concatenated multiple alignments when possible.…”

Section: Methodsmentioning

confidence: 99%

A taxonomically informed DNA reference library to facilitate future biodiversity assessments and monitoring: a case study using seaweeds along a tropical-temperate transition zone in South Africa

Reddy,

du Plessis,

Anderson

et al. 2023

Preprint

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The role of seaweeds in the blue bioeconomy has stimulated research efforts around the world but proper species identification and biodiversity assessments, remain a challenge. The South African coast hosts the confluence of the Indian Ocean and Atlantic Ocean, creating a dynamic evolutionary environment that has over time yielded a rich diversity of seaweeds with the highest seaweed diversity occurring along the Agulhas Marine Province. Although South Africa harbours one of the richer seaweed floras in the world, only 24% of the known species are represented by DNA barcodes. We therefore initiated the construction of a taxonomically guided DNA reference library for seaweeds in South Africa with the aim of continuously adding to it in the future. To do this, a seaweed biodiversity survey of the Rhodophyta occurring along a temperate-tropical biogeographic transition zone situated within the Agulhas Marine Province (AMP) in South Africa was carried out. Seaweeds were identified in the field using available field or taxonomic guides and herbarium vouchers were prepared. Subsamples were preserved for DNA analyses and three DNA barcodes (LSU D2-D3; rbcL-3P; COI 5P) were amplified. Sequences were verified on BLAST and preliminary phylogenetic analyses or comparison with the literature were carried out where necessary. A total of 220 barcodes was generated for 88 species and one species variety, including 17 species from or near their type localities and eight generitypes. Novel barcodes were generated for 73 species, nearly half of which were species endemic to Southern Africa. In addition, 21 taxa representing new, potentially new, or reinstated species and at least two new genera were identified as well as one new distribution recorded, all of which require further study. This study significantly adds to the foundational biodiversity knowledge of the South African seaweed flora and highlights new avenues for further research.

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An appraisal of the genus Pyropia (Bangiales, Rhodophyta) from southern Africa based on a multi-gene phylogeny, morphology and ecology, including the description of Pyropia meridionalis sp. nov.

Cited by 10 publications

References 57 publications

Resolving the identity of commercially cultivated Ulva (Ulvaceae, Chlorophyta) in integrated seaweed‐abalone aquaculture farms in South Africa

Resolving the identity of commercially cultivated Ulva (Ulvaceae, Chlorophyta) in integrated seaweed‐abalone aquaculture farms in South Africa

More than What Meets the Eye: Differential Spatiotemporal Distribution of Cryptic Intertidal Bangiales

A taxonomically informed DNA reference library to facilitate future biodiversity assessments and monitoring: a case study using seaweeds along a tropical-temperate transition zone in South Africa

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