Biodiversity of Hawaiian Peyssonneliales (Rhodophyta). 1. Two New Species in the Genus Ramicrusta from Lehua Island1

Sherwood, Alison R.; Paiano, Monica O.; Wade, Rachael; Cabrera, Feresa P.; Spalding, Heather L.; Kosaki, Randall K.

doi:10.2984/75.2.2

Cited by 9 publications

(13 citation statements)

References 29 publications

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“…The proportion of invariable sites and gamma shape parameters were estimated from the data, and sequence divergence was calculated using the MEGA version X computer software [ 36 ]. Sequence divergence was calculated using a neighbor-joining algorithm under a Kimura 2-parameter substitution model, which has been most often used when describing or reporting new Ramicrusta species [ 13 , 19 , 23 ]. Nonparametric bootstrapping (1000 replicates) was used to estimate node support.…”

Section: Methodsmentioning

confidence: 99%

“…Nunes and Ramicrusta paradoxa E.M.S.Pestana, G.N.Santos, Cassano & J.M.C.Nunes were recently described from southeastern Brazil [ 22 ]. Most recently, Ramicrusta hawaiiensis A.R.Sherwood and Ramicrusta lehuensis A.R.Sherwood, were described from Lehua Island in Hawaii [ 23 ]. Finally, a yet undescribed species of Ramicrusta was reported from Tunisia, representing the first report of the genus in the Mediterranean [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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The habitat-modifying red alga Ramicrusta on Pacific reefs: A new generic record for the Tropical Northwestern Pacific and the description of four new species from Guam

Mills

Schils

2021

PLoS ONE

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The genus Ramicrusta (order Peyssonneliales) is a new record for Micronesia, with range expansions of Ramicrusta fujiiana and R. lateralis to Guam. In addition, four species (Ramicrusta adjoulanensis, R. asanitensis, R. labtasiensis, and R. taogamensis) are newly described from Guam using molecular and anatomical characters. Ramicrusta lateralis specimens from Guam share most anatomical features with the holotype description from Vanuatu, but the plants from Guam are more tightly adherent, rigid, and robust than those of Vanuatu. Ramicrusta adjoulanensis possesses a well-developed epithallus with frequent cell fusions, secondary pit connections, and lacking hair bases or trichocytes, similar to Ramicrusta bonairensis. Ramicrusta adjoulanensis differs from other Ramicrusta species in having occasionally free margins and being attached by frequently produced, relatively long rhizoids (75–100 μm long). Ramicrusta asanitensis shares features with many other species, but the thickness of the crust (upwards of 2 mm thick), heavy calcification in the epithallus, and the extent of secondary, tertiary, and quaternary growth, differentiate it from other Ramicrusta species. Ramicrusta labtasiensis shares features with its close relative Ramicrusta lateralis but possesses frequent, robust, and relatively long rhizoids (75–95 μm long) throughout its entire undersurface. Ramicrusta taogamensis resembles its close relative Ramicrusta appressa but is primarily distinguished by its generally well-developed epithallus with occasional secondary pit connections and cell fusions. The six species reported here make Guam equal to Vanuatu in currently having the highest known species richness of Ramicrusta in the world.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The habitat-modifying red alga Ramicrusta on Pacific reefs: A new generic record for the Tropical Northwestern Pacific and the description of four new species from Guam

Mills

Schils

2021

PLoS ONE

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“…One genus, Ramicrusta, comprises 19 species with a global distribution (Guiry and Guiry, 2022). Ramicrusta species have been described in marine environments in the Caribbean (Pueschel and Saunders, 2009;Ballantine et al, 2016;Bramanti et al, 2017), Gulf of Mexico (Fredericq et al 2014); Brazil (Pestana et al, 2020), Guam (Mills and Schils, 2021), Australia (Dixon and Saunders, 2013;Dixon, 2018), Vanuatu (Dixon and Saunders, 2013), New Guinea (Dixon and Saunders, 2013), South China Sea (Nieder et al, 2019), Tunisia (Manghisi et al, 2019), and recently Hawai'i (Sherwood et al, 2021c).…”

Section: Introductionmentioning

confidence: 99%

“…In the last decade, many crustose genera in the Peyssonneliales and Gigartinales have been collected from the shallow intertidal to mesophotic depths in the Hawaiian Islands (Sherwood et al, 2010;Sherwood et al, 2020b;Sherwood et al, 2021a;Sherwood et al, 2021b;Sherwood et al, 2021c). These red algal crusts are often overlooked in reef ecosystems, lumped together in surveys as crustose calcifying red algae (CCRA) without determining genus or species identities, and their ecology remains little known.…”

Section: Introductionmentioning

confidence: 99%

“…While many species of Peyssonneliales were observed in previous biological inventories, such as Sherwood et al (2010), no Ramicrusta specimens were reported. Sherwood et al (2021c) described two new species of Ramicrusta in the Hawaiian Islands: Ramicrusta hawaiiensis and Ramicrusta lehuensis. These two new algae represent the first of their genus to be described in Hawai'i and have been reported only off Lehua Island, a 115 hectare uninhabited island 1.1 km north of Ni'ihau, due west of Kaua'i (22.02103°N, 160.10246°W).…”

Section: Introductionmentioning

confidence: 99%

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Long-term ecological monitoring of reefs on Hawai’i Island (2003-2020): Characterization of a common cryptic crust, Ramicrusta hawaiiensis (Peyssonneliales, Rhodophyta)

Grady

Kittle²,

Pugh³

et al. 2022

Front. Mar. Sci.

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The recently described crustose calcifying red algal species Ramicrusta hawaiiensis, known only from mesophotic depths off Lehua Island, west of Kaua’i Island, was found in shallow benthic reef habitats (3-18 m deep) along the western coast of Hawai’i Island. Molecular and microscopy techniques were used for genetic confirmation and for detailed morphological and anatomical examination. Two independent benthic cover survey datasets collected from west Hawai’i Island were used to investigate temporal and geographic distribution of Ramicrusta. In both datasets, we report Ramicrusta at approximately 60% of the sites surveyed. Benthic cover for this alga varies among sites and among years and its presence in west Hawai’i is evident since at least 2003. These findings help to document Hawaiian coral reef ecosystem change and benthic community composition reshuffling. This study also emphasizes the critical importance of taxonomy and proper identification of macroalgal species to understand the potential for phase-shifts of dominant taxa in coral reef ecosystems after environmental disturbances and fluctuations in abiotic factors. In the last decade, members of the red algal order Peyssonneliales have increased in abundance and overgrown other benthic species in reef ecosystems in the Caribbean and tropical Pacific. The novel aspect of finding abundant Ramicrusta in much shallower water than originally described, the decadal presence of Ramicrusta, and its potential for competition with other benthic organisms make this research valuable to coral reef ecology and justify further investigation of Ramicrusta ecology and biology in the Hawaiian Islands and globally.

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A new species of Gibsmithia (Dumontiaceae, Rhodophyta) from mesophotic depths of the Papahānaumokuākea Marine National Monument, Hawai‘i, USA

et al. 2022

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Molecular phylogenetic and morphological analyses of Hawaiian members of the red algal family Dumontiaceae were used to clarify the species diversity of Dudresnaya and Gibsmithia from Hawaiʻi. Although no new species of Dudresnaya were detected in the analyses, D. babbittiana is newly recorded from Lalo, Manawai, and Oʻahu. A new species of Gibsmithia, G. punonomaewa A.R.Sherwood, is described here and reported from mesophotic depths (79-104 m) of the Papahānaumokuākea Marine National Monument, Hawaiʻi. This new species differs from others in the genus based on the following combination of characters: moderate thallus size (up to 11 cm), smooth and terete gelatinous lobes, presence of a stipe (which is often branched), globose carposporangia, and a non-isodiametric shaped cell subtending the tetrasporangia. This new taxon increases the number of Gibsmithia species recorded from Hawaiʻi to three. Phylogenetically, G. pun onomaewa is most closely related to G. dotyi and G. larkumii, which are both widespread in distribution. The relatively dark habitat of the mesophotic in Papahānaumokuākea Marine National Monument contrasts with the surf ace waters of tropical and subtropical habitats where most Gibsmithia species are found, further highlighting the uniqueness of the species.

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Biodiversity of Hawaiian Peyssonneliales (Rhodophyta). 1. Two New Species in the Genus Ramicrusta from Lehua Island1

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 9 publications

References 29 publications

The habitat-modifying red alga Ramicrusta on Pacific reefs: A new generic record for the Tropical Northwestern Pacific and the description of four new species from Guam

The habitat-modifying red alga Ramicrusta on Pacific reefs: A new generic record for the Tropical Northwestern Pacific and the description of four new species from Guam

Long-term ecological monitoring of reefs on Hawai’i Island (2003-2020): Characterization of a common cryptic crust, Ramicrusta hawaiiensis (Peyssonneliales, Rhodophyta)

A new species of Gibsmithia (Dumontiaceae, Rhodophyta) from mesophotic depths of the Papahānaumokuākea Marine National Monument, Hawai‘i, USA

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