Loading...
5 results
Search Results
Now showing 1 - 5 of 5
- 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.
- 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.
- 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.
- Rhodoliths and their importance for macroalgal ecology and biodiversity in the NW Gulf of MexicoPublication . Fredericq, Suzanne; Krayesky-Self, Sherry; Sauvage, Thomas; Richards, Joseph; Kittle III, Ronald Paul; Gurgel, Carlos Frederico Deluqui; Gabriel, Daniela; Schmidt, WilliamUnderstanding the ecology and biodiversity of deep-water communities is a major challenge. In the NW Gulf of Mexico, unique deep bank habitats associated with salt domes occur at ~50-90m on the continental shelf offshore Louisiana and Texas. In these mesophotic rubble habitats rhodoliths are the main hard substrata for the attachment of macroalgae. Metabarcoding of environmental DNA using molecular markers for rhodolith’s endolithic portions has revealed hidden cryptic algal diversity including spores, propagules, and unsuspected life history stages. We explored cryo-SEM in the study of endolithic cell inclusions which brought to light a suite of microalgal stages. We were able to differentiate floridean starch from cellular inclusions. Analyses of combined 16S V4 metabarcodes and 16S Sanger sequences of several macroalgal orders increased the established record of diversity in the region. Progress is underway to link the eukaryotic component of the rhodolith holobiont (“total organism”) with its co-occurring prokaryotic component. Rhodoliths are marine biodiversity hotspots that may function as seedbanks, temporary reservoirs for life history stages of ecologically important eukaryotic microalgae, or as refugia for ecosystem resilience following environmental stress.