Browsing by Author "Schmidt, William E."
Now showing 1 - 8 of 8
Results Per Page
Sort Options
- Characterization of rhodolith beds in the northwestern Gulf of Mexico before and after the BP Deepwater Horizon oil spillPublication . Fredericq, Suzanne; Schmidt, William E.; Gabriel, Daniela; Sauvage, Thomas; Krayesky, DavidABSTRACT: In the northwestern Gulf of Mexico beds of rhodoliths and unconsolidated rubble are associated with unique offshore deep bank habitats, the salt domes or diapirs that are peculiar to that part of the northern Gulf. In contrast to being mainly composed of crustose corallines (or foraminifera), rhodoliths in the NW Gulf of Mexico at depths of 40-85 m are instead dominated by red algal crust-forming members of Peyssonneliaceae and Rhizophyllidaceae.
- Genetic diversity of Gibsmithia hawaiiensis complex (Dumontiaceae, Rhodophyta)Publication . Gabriel, Daniela; Draisma, Stefano; Schmidt, William E.; Schils, Tom; Sauvage, Thomas; Maridakis, Clio; Gurgel, Carlos Frederico Deluqui; Lim, Phaik Eem; Harris, D. J.; Fredericq, SuzanneABSTRACT: The genus Gibsmithia was erected to accommodate a species with the peculiar combination of gelatinous lobes rising from cartilaginous stalks. Based on G. hawaiiensis from Hawaii, it remained monotypic for over 20 years, when three additional species were described from Australia. G. hawaiensis is unique for its furry appearance due to cortical filaments beyond the surface. Gibsmithia have been reported from the Indian Ocean and central and western Pacific, with G. hawaiensis having the widest distribution. Genetic studies based on COI, rbcL and UPA, reveal that G. hawaiiensis is monophyletic with nine distinct species sharing a similar habit. G. hawaiiensis complex exhibits high genetic diversity in Indomalaysia region, with different species presenting genetically variable populations. Species restricted to isolated region as Hawaii or the Red Sea comprises genetically conserved populations. Four of those cryptic species can be distinguished based on characters previously regarded as morphological plasticity: the generitype and the new species G. eilatensis, G. indomalayensis and G. lata distributa. Because specimens of the other species are only available dried onto herbarium paper or in silica-gel, their reproductive characters can not be characterized. New reports of the complex are given to Madagascar, Europa Island, the Red Sea and Guam, and also to new regions of Malaysia, Indonesia, the Philippines and the French Polynesia.
- Got Talent: Peyssonnelia globally showcases its skillsPublication . Gabriel, Daniela; Krayesky, David; Norris, James N.; Schmidt, William E.; Schils, Tom; Fredericq, SuzanneABSTRACT: The crust forming genus Peyssonnelia Decaisne is a taxon of great ecological importance, with some species involved in the establishment of rhodoliths. Comparative morphological and molecular analyses demonstrate a greater diversity of peyssonnelioid species than was previously reported. In chloroplast-encoded rbcL-based trees, species referred to as Peyssonnelia in the literature do not group together, but are scattered among other genera that were not currently placed in the Peyssonneliaceae. Two recently reported genera for the Gulf of Mexico, “ Polystrata” and Metapeyssonnelia, were excluded from the family, and together with a third clade are nested inside the Rhizophyllidaceae of the Dumontiaceae-complex. The Rhizophyllidaceae is newly reported for the Gulf of Mexico, with six species. The number of distinct species of Peyssonneliaceae now present in the Gulf of Mexico has increased from 6 to 21. On the other hand, the number of Peyssonnelia reported for the Azores was reduced from five to one species. Some species placed in Cruoriella and Cruoriopsis actually belong in the Peyssonneliaceae. New combinations are being proposed to accommodate known and new species in Cruoriella, and in two formerly monotypic genera, Sonderophycus and Riquetophycus. The Peyssonneliaceae forms a monophyletic assemblage that could not be maintained in the Gigartinales and thus a new order was constituted, Peyssonneliales, unrelated to the cluster of families centred around the Halymeniaceae of the Halymeniales, or the Gigartinaceae of the Gigartinales.
- A New Crustose Species of Phymatolithon (Hapalidiales, Corallinophycidae) From The Mediterranean Sea (Abu Qir, Egypt)?Publication . Kittle III, Ronald Paul; Richards, Joseph; Nguyen, A.; Gabriel, Daniela; Sauvage, Thomas; Schmidt, William E.; Fredericq, SuzannePhymatolithon is one of the most studied and ecologically important crustose coralline algae (CCA) because of their dominance in various marine ecosystems worldwide. The taxonomic history of the genus has been complex, and the genus has been revised multiple times on the basis of morphological and molecular analyses.
- New Deepwater Species Of Red Algae Growing In Rhodolith Beds In The NW Gulf Of MexicoPublication . Fredericq, Suzanne; Arakaki, Natalia; Ehrenhaus, Constanza; Norris, James N.; Richards, Joseph; Gabriel, Daniela; Sauvage, Thomas; Gurgel, Carlos Frederico Deluqui; Kittle III, Ronald Paul; Krayesky, Sherry; Schmidt, William E.This talk will focus on recently collected new species of marine red algae growing on the surface of rhodoliths at 56-85m depth in the northwestern Gulf of Mexico.
- The Renouxia files: the richness is out there!Publication . Gabriel, Daniela; Norris, James N.; Schmidt, William E.; Harris, D. J.; Fredericq, SuzanneABSTRACT: In 1989, a gelatinous red alga was reported for the Caribbean, to which no species name, genus, order or even family could be assigned. Renouxia antillana was finally described in 1995 and accomodated in a new order and family (Rhodogorgonales, Rhodogorgonaceae) along with Rhodogorgon ramosissima described six years earlier based on material from reefs in Belize. For more than 20 years, the genus has remained monotypic, with rare reports in the Caribbean and in the Indo-Pacific (from Malaysia to French Polynesia). Recent collections in Egypt resulted in the first record of Renouxia in the Red Sea. DNA sequence analyses indicate that the specimens belong to a new species. The cox1 pairwise distance among the Red Sea specimens is 0.0-0.2%, while the distance between these and the generitype is 7.5 -7.7%. This interspecific nucleotide diversity is as high as the diversity between R. antillana and Rhodenigma contortum (7.2-7.5%), the third species in the family. RbcL pairwise distances are also high (6.7% within Renouxia, and 9.1-9.6% between Renouxia and Rhodenigma), indicating the possibility that the new species belongs to a new genus. Morphological and anatomical studies are underway to formally describe the new taxon.
- To be or not to be: Will the real Chrysymenia (Rhodymeniaceae, Rhodophyta) please stand up?Publication . Schmidt, William E.; Arakaki, Natalia; Gurgel, Carlos Frederico Deluqui; Gabriel, Daniela; Norris, James N.; Ballantine, David; Fredericq, SuzanneABSTRACT: The genera in the Rhodymeniaceae that have a hollow thallus lacking diaphragms comprise Chrysymenia J. Agardh (including Gloiosaccion Harvey), Botryocladia (Agardh) Kylin and Irvinea Guiry. Chrysymenia has traditionally been defined by a lack of internal rhizoids and with the only solid portion of the thallus limited to the stipe, and Botryocladia is characterized by the presence of larger, solid axes.
- What can the Gulf of Mexico and Panama tell us about education and outreach?Publication . Fredericq, Suzanne; Wysor, B.; Freshwater, D.W.; Krayesky-Self, S.; Collin, R.; Sauvage, Thomas; Richards, Joseph; Gabriel, Daniela; Arakaki, Natalia; Camacho, Olga; Cho, Tae Oh; Won, Boo Yeon; Ehrenhaus, Constanza; Venera-Ponton, Dagoberto; Kittle III, Ronald Paul; Krayesky, David; Gurgel, Carlos Frederico Deluqui; Schmidt, William E.ABSTRACT: A series of research grants funded by the National Science Foundation involved a major component about education and outreach as it pertained to marine algal diversity. These included comprehensive studies into 1) the diversity of the deep bank marine algae in the Gulf of Mexico (NSF Biodiversity Surveys and Inventories program) and the discovery of unsuspected eukaryotic life inhabiting rhodolith forming coralline algae (NSF DEB), 2) monographic research (NSF PEET), 3) advanced tropical phycology with the integration of modern and traditional techniques in the study of tropical algae of Panama (NSF PASI), among others.