A Dynamic Approach to the Study of Rhodoliths: A Case Study for the Northwestern Gulf of Mexico

Fredericq, Suzanne; Arakaki, Natalia; Camacho, Olga; Gabriel, Daniela; Krayesky, David M.; Self-Krayesky, Sherry L.; Rees, George H.; Richards, Joseph L.; Sauvage, Thomas; Venera‐Pontón, Dagoberto E.; Schmidt, William E.

doi:10.7872/crya.v35.iss1.2014.77

Cited by 36 publications

(37 citation statements)

References 58 publications

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“…Prior to the 2010 Deepwater Horizon oil spill (DWH), extensive rhodolith beds covering the flanks and tops of hard bank pinnacles offshore Louisiana in the NW Gulf of Mexico, such as Ewing Bank (vicinity of 28°05.7′N, 91°01.2′W), typically sustained a lush diversity of encrusting, filamentous and fleshy macroalgae growing on the rhodoliths’ surface25. In contrast, after DWH the macroalgae covering these rhodoliths disappeared and most rhodoliths themselves appeared bleached, and fully or partially denuded of surface macroalgae, a situation that has persisted in the field as of September 2014, our last expedition to Ewing Bank.…”

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confidence: 99%

Eukaryotic Life Inhabits Rhodolith-forming Coralline Algae (Hapalidiales, Rhodophyta), Remarkable Marine Benthic Microhabitats

Krayesky-Self

Schmidt

Phung

et al. 2017

Sci Rep

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Rhodoliths are benthic calcium carbonate nodules accreted by crustose coralline red algae which recently have been identified as useful indicators of biomineral changes resulting from global climate change and ocean acidification. This study highlights the discovery that the interior of rhodoliths are marine biodiversity hotspots that function as seedbanks and temporary reservoirs of previously unknown stages in the life history of ecologically important dinoflagellate and haptophyte microalgae. Whereas the studied rhodoliths originated from offshore deep bank pinnacles in the northwestern Gulf of Mexico, the present study opens the door to assess the universality of endolithic stages among bloom-forming microalgae spanning different phyla, some of public health concerns (Prorocentrum) in marine ecosystems worldwide.

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confidence: 99%

Eukaryotic Life Inhabits Rhodolith-forming Coralline Algae (Hapalidiales, Rhodophyta), Remarkable Marine Benthic Microhabitats

Krayesky-Self

Schmidt

Phung

et al. 2017

Sci Rep

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“…Collected specimens were desiccated in silica gel aboard the R/V Pelican and/or preserved in 5% formalin/seawater, and deposited in the University of Louisiana at Lafayette Herbarium (LAF). Another portion of the samples was transported to the laboratory as "live rocks" (Delbeek & Sprung 2005) and grown in 75-liter microcosm tanks prior to harvesting and preservation as described in Fredericq et al (2014), Richards et al (2014) and Felder et al (2014). Exploratory DNA sequencing and SEM imaging led to the identification of eight specimens from the NWGMx belonging to the genus Lithothamnion.…”

Section: Methodsmentioning

confidence: 99%

Molecular and Morphological Diversity of Lithothamnion spp. (Hapalidiales, Rhodophyta) from Deepwater Rhodolith Beds in the Northwestern Gulf of Mexico

et al. 2016

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In the Northwestern Gulf of Mexico (NWGMx), subtidal rhodolith beds offshore Louisiana at 45-80 m depth harbor a diverse community of uncharacterized non-geniculate coralline algae including both biogenic and autogenic rhodoliths and other encrusting taxa. Identifying specimens to their correct genus and species is an ongoing process because many available names remain to be validated by comparison to type specimens. Here, comparative DNA sequencing (psbA, UPA, and COI) and scanning electron microscopy (SEM) are used to assess the molecular and morphological diversity of the rhodolithforming specimens belonging to the generic concept of Lithothamnion. Phylogenetic and species delimitation analyses of the newly generated sequences from recently dredged specimens at Ewing and Sackett Banks offshore Louisiana reveal the presence of at least six species of Lithothamnion, whose generic placement is confirmed by SEM images of features considered characteristic for the genus. More broadly, our analyses indicate at least eight Lithothamnion species are found in the Gulf of Mexico. Phylogenetic analyses of single (psbA and COI) and concatenated markers (psbA, COI and UPA) show that Lithothamnion is polyphyletic.

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“…A subset of samples was desiccated in silica gel aboard the R/V Pelican and/or preserved in 5% formalin/seawater and deposited in the University of Louisiana at Lafayette Herbarium (LAF). Another portion of the samples was transported to the laboratory as "live rocks" and grown in 75-liter microcosm tanks as described in Fredericq et al (2014). After subsequent growth in the microcosms (3-11 months), coralline algal specimens were harvested and preserved in silica gel and/or 5% formalin/seawater and deposited at LAF (Thiers 2014).…”

Section: Methodsmentioning

confidence: 99%

“…In the Northwestern Gulf of Mexico (NWGMx) offshore Louisiana, subtidal rhodolith beds are associated with offshore deep bank habitats known as salt domes or diapirs, at a depth of 45-80m (Fredericq et al 2014). These rhodolith communities consist of both biogenically and autogenically formed rhodoliths and comprise a diverse assemblage of non-geniculate coralline algae (Richards, unpubl.…”

Section: Introductionmentioning

confidence: 99%

“…Comparative DNA sequencing and morphological analyses were conducted on non-geniculate Corallinales present in box dredges during the course of six dredging expeditions in the NWGMx following the April 2010 Deepwater Horizon oil spill (Fredericq et al 2014). Often non-geniculate corallines were the only visible algal species present in the dredges post-spill.…”

Section: Introductionmentioning

confidence: 99%

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New Insights into the Genus Lithophyllum (Lithophylloideae, Corallinaceae, Corallinales) from Deepwater Rhodolith Beds Offshore the NW Gulf of Mexico

Richards¹,

Gabrielson²,

Fredericq³

2014

Phytotaxa

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Hard bank rhodolith beds at 45-80 m depth offshore Louisiana in the Northwestern Gulf of Mexico harbor a diverse community of non-geniculate coralline algae spanning multiple lineages including both rhodolith-forming (biogenic) taxa and others encrusting autogenic rhodoliths. Identifying these members of the Corallinales to the correct genus and species is an ongoing process because many available names need to be validated by comparison to historical type specimens. A phylogenetic analysis of concatenated plastid (psbA), nuclear (LSU rDNA), and mitochondrial (COI) DNA sequences of non-geniculate corallines belonging to the subfamily Lithophylloideae (Corallinaceae), including newly generated sequences from recently collected specimens dredged at Ewing and Sackett Banks following the April 2010 Deepwater Horizon oil spill, reveals at least two distinct species of Lithophyllum sensu lato for the region. Scanning Electron Microscopy confirmed the presence of vegetative characters congruent with those for both Lithophyllum and Titanoderma. Lithophyllum is a newly reported genus for the northern Gulf of Mexico. The generic boundaries within the Lithophylloideae are addressed in light of possible evolutionary progenetic heterochrony that may have occurred within this subfamily.

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A Dynamic Approach to the Study of Rhodoliths: A Case Study for the Northwestern Gulf of Mexico

Cited by 36 publications

References 58 publications

Eukaryotic Life Inhabits Rhodolith-forming Coralline Algae (Hapalidiales, Rhodophyta), Remarkable Marine Benthic Microhabitats

Eukaryotic Life Inhabits Rhodolith-forming Coralline Algae (Hapalidiales, Rhodophyta), Remarkable Marine Benthic Microhabitats

Molecular and Morphological Diversity of Lithothamnion spp. (Hapalidiales, Rhodophyta) from Deepwater Rhodolith Beds in the Northwestern Gulf of Mexico

New Insights into the Genus Lithophyllum (Lithophylloideae, Corallinaceae, Corallinales) from Deepwater Rhodolith Beds Offshore the NW Gulf of Mexico

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