The reinstatement of <i>Plocamium robertiae</i> (Rhodophyta, Plocamiales) and an updated species inventory of the genus in South Africa

Reddy, Maggie M.; Plessis, Jamie du; Roodt‐Wilding, Rouvay; Bolton, John J.

doi:10.1080/00318884.2023.2174342

Cited by 4 publications

(7 citation statements)

References 33 publications

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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 long and often complicated process of alpha taxonomy and a lack of expertise on certain groups of marine organisms such as seaweeds (De Clerck et al 2013) 2006), it is certainly useful for understanding the overall biodiversity of a region and can be used to guide further research efforts (Reddy et al 2020b;Reddy et al 2023). The need for taxonomically guided DNA reference libraries however is much needed and is becoming more pertinent than ever, especially in an age of metabarcoding or eDNA (Cristescu and Hebert, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…While DNA barcoding is no substitute for alpha taxonomy (DeSalle 2006), it is certainly useful for understanding the overall biodiversity of a region and can be used to guide further research efforts (Reddy et al . 2020b; Reddy et al . 2023).…”

Section: Discussionmentioning

confidence: 99%

“…Preliminary phylogenetic analyses and comparison with the literature suggest that our dataset contained two potentially new genera (1 previously identified-‘ Tenebris’ sensu Johnson 2017), 19 unidentified and potentially new species, one new species (Reddy et al . 2020b), one reinstated species (Reddy et al . 2023) and one new distribution record (this study).…”

Section: Discussionmentioning

confidence: 99%

“…Reddy, R.J. Anderson, Bolton (Reddy et al . 2020) and the reinstatement of Plocamium robertiae F.Schmitz ex Mazza, a species previously placed in synonymy with P. corallorhiza (Turner) Hooker f. & Harvey (Reddy et al . 2023).…”

Section: Discussionmentioning

confidence: 99%

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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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The African seaforest: a review

Prew,

Reddy,

Mehta

et al. 2024

Botanica Marina

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Kelp forests dominate the western and southwestern coastlines of southern Africa. This expansive ecosystem spreads over two very different ecoregions that are of particular interest to researchers due to the complexities of their physical environment. The mid-to-late 1900s saw a proliferation in pioneering research on southern African kelp forests. Since this period (1970–1989), researchers have published comparatively few seminal studies concerning kelp forest ecology and biological functioning. In light of this deficit, this review synthesised pre-existing research on southern African kelp forests, and highlighted key gaps in the research landscape to spark interest and facilitate new studies. Among several others, key research gaps uncovered by this review include kelp carbon sequestration potential and possible contributions to the blue bioeconomy; deeper exploration into the biological functioning and ecological roles of Macrocysis pyrifera and Ecklonia radiata populations in southern Africa; and the impacts of a changing physical environment on these kelp forests. In light of our rapidly changing climate, filling these gaps will be essential in informing conversations around coastal and marine management decisions and policy.

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The reinstatement of Plocamium robertiae (Rhodophyta, Plocamiales) and an updated species inventory of the genus in South Africa

Cited by 4 publications

References 33 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

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

The African seaforest: a review

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