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 11 publications

(5 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Intriguingly, our data also reveal the existence of a possible third Ecklonia lineage in the deep population of Rocky Bank, where both nuclear and mitochondrial markers exhibit unexpectedly high levels of divergence. These results underscore the importance of molecular data in identifying cryptic diversity, particularly in morphologically plastic genera capable of hybridization 23,25,106,107 . Further analysis that integrates taxonomy and genetics will be key for understanding the complex dynamics of hybridization in a region where ocean conditions are predicted to undergo complex and unique changes.…”

Section: Discussionmentioning

confidence: 67%

Cryptic diversity in southern African kelp

Madeira,

Reddy,

Assis

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

The southern coast of Africa is one of the few places in the world where water temperatures are predicted to cool in the future. This endemism-rich coastline is home to two sister species of kelps of the genus Ecklonia maxima and Ecklonia radiata, each associated with specific thermal niches, and occuring primarily on opposite sides of the southern tip of Africa. Historical distribution records indicate that E. maxima has recently shifted its distribution ~ 70 km eastward, to sites where only E. radiata was previously reported. The contact of sister species with contrasting thermal affinities and the occurrence of mixed morphologies raised the hypothesis that hybridization might be occurring in this contact zone. Here we describe the genetic structure of the genus Ecklonia along the southern coast of Africa and investigate potential hybridization and cryptic diversity using a combination of nuclear microsatellites and mitochondrial markers. We found that both species have geographically discrete genetic clusters, consistent with expected phylogeographic breaks along this coastline. In addition, depth-isolated populations were found to harbor unique genetic diversity, including a third Ecklonia lineage. Mito-nuclear discordance and high genetic divergence in the contact zones suggest multiple hybridization events between Ecklonia species. Discordance between morphological and molecular identification suggests the potential influence of abiotic factors leading to convergent phenotypes in the contact zones. Our results highlight an example of cryptic diversity and hybridization driven by contact between two closely related keystone species with contrasting thermal affinities.

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

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 11 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

Cryptic diversity in southern African kelp

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

Contact Info

Product

Resources

About