Phaeophyta

Kawai, Hiroshi; Henry, Eric C.

doi:10.1007/978-3-319-32669-6_31-1

Cited by 8 publications

(3 citation statements)

References 120 publications

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“…Marine brown macroalgae (class Phaeophyceae) are classified into around 300 genera comprising more than 2,000 species (Kawai and Henry, 2016). These multicellular macroalgae almost exclusively inhabit marine environments, primarily along rocky coastlines in temperate to polar regions (Duarte et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Tolerance in Metal-exposed Brown Algae and the Importance of Monitoring Studies: A Review

Montenegro

2024

Ecotoxicol. Environ. Contam.

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Marine habitats are under threat from the continued release of contaminants into waterways, and monitoring becomes crucialto future management decisions and regulations to protect these environments. A key aspect of this monitoring is the choiceof a marine species that is able to cope with this pollution, and the tolerant species exhibit more relevant ecological responses.These species-responses are called biomarkers of tolerance and are tested using a variety of measurements that reflect exposureto chemicals. Marine brown macroalgae can be found in a wide range of marine environments, including those with high metalpollution and they are widely used in monitoring programs. Mechanisms of tolerance are vital to the survival of this group ofmacroalgae in polluted habitats, but these mechanisms have not yet been reviewed. The aim of this critical review article isto summarize the historical information available regarding metal tolerance in marine brown macroalgae. We review studiesabout tolerance mechanisms in marine brown macroalgae exposed to metals, conducted both under experimental conditionsand in the field. Also, bibliometric analyses are used to identify the most relevant investigations, country contributions andgaps in knowledge on the topic. Results showed that the principal extracellular tolerance mechanisms described for marinebrown macroalgae are physical exclusion, exudated ligands, and metal-binding to the cell wall. Epiphytic microorganismswere also found to be capable of accumulating a given metal. Internally, metallothioneins and phytochelatins were importantchelators; furthermore, antioxidant responses may increase metal tolerance. Omics analyses were used to reveal the internalmechanisms used by these macroalgae. Biomarkers of tolerance have occasionally been used in monitoring studies, providingadditional information regarding tolerance to complex chemical mixtures found in the field. Future studies should make use ofthese biomarkers to improve our understanding of metal-tolerance strategies.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of Tolerance in Metal-exposed Brown Algae and the Importance of Monitoring Studies: A Review

Montenegro

2024

Ecotoxicol. Environ. Contam.

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“…The higher rank taxonomy of brown algae (Phaeophyceae) has been considerably revised in the last few decades, especially in certain orders, by the application of life history studies and molecular phylogenetic analyses 1,2,3,4,5 . Ectocarpales and its related orders, comprising taxonomic groups of relatively small, soft thalli and showing heteromorphic life histories, are an example.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, genus and species level taxonomy of the ectocarpalean members with terete, parenchymatous thalli having multiple chloroplasts have been relatively well documented because of their easily recognizable macroscopic thalli, distinctive anatomical features applicable to taxonomic comparisons, and the substantial number of life history studies using unialgal cultures elucidating their life histories and early development. Most of their genera were described by the 1960's, and no additional taxa at genus level have been published for several decades, excluding the proposals of new a genus for known species originally described in a different genus 2,4,9,10,11 . However, recently in the western part of the Seto Inland Sea, Japan, which has a unique geography but has had only limited taxonomic surveys, we collected an undescribed brown alga with unique morphological features.…”

Section: Introductionmentioning

confidence: 99%

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

Kawai

Hanyuda

2021

Preprint

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A novel brown algal genus and species Setoutiphycus delamareoides (Ectocarpales sensu lato) is described from the Seto Inland Sea, Japan. The species is similar to Delamarea attenuata in gross morphology and anatomy, but distinctive in having longer thalli with rare branching, shorter cortical cells, and occurrence of branches at the tip of plurilocular zoidangia. Erect thalli were epilithic, solitary or caespitose, filiform, simple or rarely branched, attenuated towards the base, blunt at the tip, with uneven surface, yellowish brown in color, up to about 15 cm in height and 2 mm in diameter, parenchymatous, solid when young and later becoming hollow, composed of 1–2 layers of large colorless inner cells, subcortical cells, barrel-shaped large cortical cells of up to 100 µm in height and up to 60 µm in diameter, and phaeophycean hairs. Plurilocular and unilocular zoidangia developed on the same thallus, the former conical to lanceolate, sometimes branched at the tip and projected from the cortical cells, and the latter ovate. Each cell contained many discoidal chloroplasts with projected pyrenoids. In the molecular phylogeny using concatenated DNA sequences of mitochondrial cox1, cox3 and chloroplast atpB, psaA, psbA and rbcL genes, the novel alga nested in the clade composed of ectocarpalean genera of diffuse growth, with parenchymatous thalli with multiple chloroplasts, but was distinctive. Therefore, we propose the establishment of a new genus and species Setoutiphycus delamareoides gen. & sp. nov. for the novel alga, and provisionally place it in Chordariaceae, Ectocarpales sensu lato. As to the biogeography, the Seto Inland Sea repeatedly dried by sea level regression during the glacial periods and the present sea level has recovered after the LGM of ca. 10,000 years ago. Therefore, it is unlikely that the evolution of the genus and species occurred within this area, and its isolated distribution may be explained as a remnant population that survived in the refugia in southern Japan during LGM. It is possible that the species also has a broader distributional range, at least in Japan, such as northern Honshu, but if not, the species can be endangered due to the raise of seawater temperature in the area by global climate change, because the Seto Inland Sea is enclosed at its northern end, so the population cannot spread to colder more northern coasts.

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Viruses of Seaweeds

Schroeder

McKeown

2021

Studies in Viral Ecology

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Phaeophyta

Cited by 8 publications

References 120 publications

Mechanisms of Tolerance in Metal-exposed Brown Algae and the Importance of Monitoring Studies: A Review

Mechanisms of Tolerance in Metal-exposed Brown Algae and the Importance of Monitoring Studies: A Review

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

Viruses of Seaweeds

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