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Your search keyword '"Schmidt, William E."' showing total 26 results
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26 results on '"Schmidt, William E."'

6. Assessment of Rhodolith Diversity in the Northwestern Gulf of Mexico Including the Description of Sporolithon gracile sp. nov. (Sporolithales, Rhodophyta), and Three New Species of Roseolithon (Hapalidiales, Rhodophyta)

Author

Richards, Joseph, Kittle, Ronald P., Schmidt, William E., Sauvage, Thomas, Gurgel, Carlos F. D., Gabriel, Daniela, and Fredericq, Suzanne

Subjects
Gulf of Mexico, Global and Planetary Change, mesophotic, Ocean Engineering, Aquatic Science, CCA, rhodoliths, Oceanography, coralline algae, FGBNMS, Water Science and Technology
Abstract

In the past, non-geniculate coralline algae in the northwestern Gulf of Mexico have been identified based primarily on comparative morpho-anatomy. Recent studies employing DNA sequencing techniques combined with morpho-anatomical studies using SEM have revealed a wealth of previously undocumented diversity of rhodolith-forming non-geniculate coralline algae in the Corallinales, Hapalidiales and Sporolithales from mesophotic hard bank communities at 45-90 meters depth. Although many advances in the last decade have been made in clarifying species names and describing new species of corallines from offshore Louisiana and Texas, total diversity estimates are still incomplete and many species remain to be described. Collections from offshore Louisiana at Parker Bank in the newly expanded Flower Garden Banks National Marine Sanctuary yielded thin, finely branched rhodoliths. DNA sequence analyses of plastid-encoded psbA and rbcL loci, and nuclear-encoded LSU rDNA of these rhodolith-forming specimens revealed that some belong to an unnamed species of Sporolithon (Sporolithales) that we herein newly describe. Additionally, comparative DNA sequence analyses of rhodolith collections from Ewing Bank and other hard banks offshore Louisiana were conducted to assess rhodolith diversity in these mesophotic communities. The results revealed new reports of taxa for the region, including new rhodolith-forming species of Roseolithon (Hapalidiales) to be described herein as well. Our new biodiversity findings will be compared with historical studies from the NW Gulf of Mexico.

Published
2022

8. A new species of Phymatolithon Foslie, P. abuqirensis (Hapalidiaceae, Hapalidiales), from Mediterranean Egypt

Author

Kittle, Ronald P., Richards, Joseph L., Sauvage, Thomas, Gabriel, Daniela, Schmidt, William E., Fredericq, Suzanne, Kittle, Ronald P., Richards, Joseph L., Sauvage, Thomas, Gabriel, Daniela, Schmidt, William E., and Fredericq, Suzanne

Abstract

Phymatolithon Foslie is one of the most studied and ecologically important genera of crustose coralline algae (CCA) due to their dominant abundance in various marine ecosystems worldwide. The taxonomy of the genus is complex and has been revised and updated many times based on morphological and molecular analyses. We report on a crustose coralline algal species collected in June 2011 via snorkeling in the subtidal zone along the beach Abu Qir on the Mediterranean coast of Egypt, as part of a larger macroalgal diversity survey in the region. The species shows significant sequence divergences (3.5%–14.8% in rbcL; 2.9%–11% in psbA) from other closely related Phymatolithon taxa. Morpho-anatomically, this species possesses the characters considered collectively diagnostic of the genus Phymatolithon, namely, thalli non-geniculate epithelial cells and non-photosynthetic and domed-shaped meristematic cells, usually as short with progressive elongation of their perithallial derivatives. Based on molecular and morphological analyses, we determined that these specimens encompass a new, distinct species that we herein name Phymatolithon abuqirensis. Including this new species, the total number of described Phymatolithon species found in the Mediterranean Sea is now six.

Published
2022
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9. DNA sequencing of type material and newly collected specimens reveals two heterotypic synonyms for Harveylithon munitum (Metagoniolithoideae, Corallinales, Rhodophyta) and three new species

Author

Richards, Joseph L., primary, Schmidt, William E., additional, Fredericq, Suzanne, additional, Sauvage, Thomas, additional, Peña, Viviana, additional, Le Gall, Line, additional, Mateo‐Cid, Luz Elena, additional, Mendoza‐González, Angela Catalina, additional, Hughey, Jeffery R., additional, and Gabrielson, Paul W., additional

Published
2021
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14. Molecular systematics of Crassiphycus and Hydropuntia (Gracilariales, Rhodophyta) with the description of poorly known taxa in the Western Atlantic Ocean.

Author

Gurgel, Carlos Frederico D., Soares, Luanda P., Norris, James N., Fujii, Mutue T., Schmidt, William E., and Fredericq, Suzanne

Subjects
DNA sequencing, GRACILARIA, PHENOTYPIC plasticity, RED algae, OCEAN, BANGIALES, GENETIC speciation
Abstract

This study builds on recent treatments of the marine red algal family Gracilariaceae (Gracilariales) focusing in detail on Hydropuntia and Crassiphycus. Species in these two genera often present identification problems due to high levels of morphologial similarity among genetically distinct species, and high levels of phenotypic plasticity, leading to pseudocryptic speciation and homoplasies. In order to resolve long standing problems, clarify some species concepts and better understand the evolution of the group, we performed phylogenetic analyses of all plastid rbcL DNA sequences available for known Hydropuntia and Crassiphycus species, including newly sequenced specimens. Our results revealed the presence of potentially undescribed species, the existence of strong phylogeographic patterns below and above the species level and helped re-delineate morphologically similar taxa. New detailed morphological descriptions for three common yet poorly known Western Atlantic species are provided: C. secundus, C. usneoides and H. rangiferina. H. rangiferina from the Indo- Pacific is a distinct species from the true H. rangiferina and represents a putative undescribed species. We also provide a time-calibrated phylogeny for the six genera in the Gracilariales to identify past geological and climatic processes associated with their origin and diversification. [ABSTRACT FROM AUTHOR]

Published
2021
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15. Quite an oddity: new worldwide records of Renouxia (Rhodogorgonales, Rhodophyta), including R. marerubra sp. nov.

Author

Gabriel, Daniela, Draisma, Stefano G.A., Schils, Tom, Schmidt, William E., Sauvage, Thomas, Harris, D. James, Norris, James N., and Fredericq, Suzanne

Subjects
CERAMIALES, RED algae, CURIOSITIES & wonders, RECORDS
Abstract

The gelatinous, calciferous red alga Renouxia antillana was described in 1995 based on material from Guadeloupe, French West Indies, and accommodated in a new family and order (Rhodogorgonaceae, Rhodogorgonales) along with the genus Rhodogorgon from Belize and Caribbean Panama. For more than 20 years, Renouxia has remained monotypic, with rare reports in the Caribbean and the Indo-Pacific (from Réunion Island to French Polynesia). DNA-based analyses of recently collected Renouxia specimens from Egypt showed that they are not conspecific with the Caribbean R. antillana and are described as R. marerubra sp. nov. Uncorrected p-distances between the Red Sea specimens and the generitype were 8.0% for COI, 6.5-7.3% for rbcL and 3.1% for UPA. Morphological and anatomical features are also presented for the newly described species and compared to its congener, with the first documented report of monoecism in the Rhodogorgonales. Besides the new record of Renouxia from the Red Sea, the geographic distribution of the genus is here extended with additional records from Sri Lanka, Indonesia, as well as the islands of Guam and Kosrae in the Western Pacific. The UPA phylogeny suggests that these new distribution records may also represent undescribed species, with representatives in two distinct genetic groups. [ABSTRACT FROM AUTHOR]

Published
2020
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25. Highly Conserved Mitochondrial Genomes among Multicellular Red Algae of the Florideophyceae

Author

Yang, Eun Chan, primary, Kim, Kyeong Mi, additional, Kim, Su Yeon, additional, Lee, JunMo, additional, Boo, Ga Hun, additional, Lee, Jung-Hyun, additional, Nelson, Wendy A., additional, Yi, Gangman, additional, Schmidt, William E., additional, Fredericq, Suzanne, additional, Boo, Sung Min, additional, Bhattacharya, Debashish, additional, and Yoon, Hwan Su, additional

Published
2015
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