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Silvetia
''Silvetia'' is a genus of brown algae, commonly known as rockweed, found in the intertidal zone of rocky seashores of the Pacific Ocean. These were originally classified as members of the genus ''Pelvetia''. In 1999, ''Silvetia sp.'' was created as a separate species from ''Pelvetia canaliculata'' due to differences of oogonium An oogonium (: oogonia) is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female (haploid or diploid) gametangium of certain thallophytes. In the mammalian fetus Oogonia are formed in large ... structure and of nucleic acid sequences of the rDNA. It was renamed in honor of Paul Silva, Curator of Algae at the Herbarium of the University of California, Berkeley. There are three species and one subspecies. Taxonomy This list of species of ''Silvetia'' contains those considered to belong to this genus as of 2013: *'' Silvetia babingtonii'' (Harvey, 1860) (E.Serrão, T.O.Cho, S.M.Boo & Brawley, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Silva
Paul Claude Silva (October 31, 1922 – June 12, 2014) was a phycologist, marine biologist, and algal taxonomist considered to be the world's leading expert in the chlorophyte green algal genus ''Codium''. Silva was also an expert in botanical nomenclature and was an editor of the International Code of Botanical Nomenclature's Eighth through Sixteenth International Botanical Congresses. Biography Silva completed his undergraduate degree at the University of Southern California, though his education was interrupted by World War II. He served in the US Navy on the USS Darby, participating in the Battle of Leyte Gulf. He attended Stanford University for his master's degree studying under Gilbert Morgan Smith, and University of California, Berkeley for his Ph.D. Silva later worked as a Research Botanist and Curator of Algae at the UCB herbarium. While at UC Berkeley, Silva met his life partner Lawrence Ray Heckard. Honours He has been honoured in the naming of several taxa of al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelvetia
''Pelvetia canaliculata'', the channelled wrack, is a very common brown alga (Phaeophyceae) found on the rocks of the upper shores of Europe. It is the only species remaining in the monotypic genus ''Pelvetia''. In 1999, the other members of this genus were reclassified as '' Silvetia'' due to differences of oogonium structure and of nucleic acid sequences of the rDNA. Description ''Pelvetia'' grows to a maximum length of in dense tufts, the fronds being deeply channeled on one side: the channels and a mucus layer help prevent the seaweed drying (desiccation) when the tide is out. It is irregularly dichotomously branched with terminal receptacles, and is dark brown in color. Each branch is of uniform width and without a midrib. The receptacles are forked at the tips. It is distinguished from other large brown algae by the channels along the frond. It has no mid-rib, no air-vesicles and no cryptostomata. It forms the uppermost zone of algae on the shore growing at or above hig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Susan Brawley
Susan Brawley is an American marine ecologist at the University of Maine known for her research on algae, especially algal reproduction. She was elected a fellow of the American Association for the Advancement of Science in 2012. Education and career Brawley has a B.S. from Wellesley College (1973) and earned her Ph.D. in 1978 from the University of California, Berkeley. Following her Ph.D., she worked at the Smithsonian Institution and the University of Connecticut. In 1983, she joined Vanderbilt University as an assistant professor. In 1991, she moved to the University of Maine where she was promoted to professor in 1994. Brawley was the Editor of the Journal of Phycology from 1996 until 2001. She was the president of the Phycological Society of America in 2011. Research Brawley's early research examined the biology of the brown algae ''Fucus'' and macroalgal reproductive ecology, and the role of grazers in determining community structure on coral reefs. In the rocky ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brown Algae
Brown algae (: alga) are a large group of multicellular algae comprising the class (biology), class Phaeophyceae. They include many seaweeds located in colder waters of the Northern Hemisphere. Brown algae are the major seaweeds of the temperate and polar regions. Many brown algae, such as members of the order Fucales, commonly grow along rocky seashores. Most brown algae live in marine environments, where they play an important role both as food and as a potential habitat. For instance, ''Macrocystis'', a kelp of the order Laminariales, may reach in length and forms prominent underwater kelp forests that contain a high level of biodiversity. Another example is ''Sargassum'', which creates unique floating mats of seaweed in the tropical waters of the Sargasso Sea that serve as the habitats for many species. Some members of the class, such as kelps, are used by humans as food. Between 1,500 and 2,000 species of brown algae are known worldwide. Some species, such as ''Ascophyllum ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intertidal Zone
The intertidal zone or foreshore is the area above water level at low tide and underwater at high tide; in other words, it is the part of the littoral zone within the tidal range. This area can include several types of habitats with various species of life, such as sea stars, sea urchins, and many species of coral with regional differences in biodiversity. Sometimes it is referred to as the ''littoral zone'' or '' seashore'', although those can be defined as a wider region. The intertidal zone also includes steep rocky cliffs, sandy beaches, bogs or wetlands (e.g., vast mudflats). This area can be a narrow strip, such as in Pacific islands that have only a narrow tidal range, or can include many meters of shoreline where shallow beach slopes interact with high tidal excursion. The peritidal zone is similar but somewhat wider, extending from above the highest tide level to below the lowest. Organisms in the intertidal zone are well-adapted to their environment, facing high ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is bounded by the continents of Asia and Australia in the west and the Americas in the east. At in area (as defined with a southern Antarctic border), the Pacific Ocean is the largest division of the World Ocean and the hydrosphere and covers approximately 46% of Earth's water surface and about 32% of the planet's total surface area, larger than its entire land area ().Pacific Ocean . ''Encyclopædia Britannica, Britannica Concise.'' 2008: Encyclopædia Britannica, Inc. The centers of both the Land and water hemispheres, water hemisphere and the Western Hemisphere, as well as the Pole of inaccessi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oogonium
An oogonium (: oogonia) is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female (haploid or diploid) gametangium of certain thallophytes. In the mammalian fetus Oogonia are formed in large numbers by mitosis early in fetus, fetal development from germ cell, primordial germ cells. In humans they start to develop between weeks 4 and 8 and are present in the fetus between weeks 5 and 30. Structure Normal oogonia in human ovary, ovaries are spherical or ovoid in shape and are found amongst neighboring somatic (biology), somatic cells and oocytes at different phases of development. Oogonia can be distinguished from neighboring somatic cells, under an electron microscope, by observing their Cell nucleus, nuclei. Oogonial nuclei contain randomly dispersed fibrillar and granular material whereas the somatic cells have a more condensed nucleus that creates a darker outline under the microscope. Oogonial nuclei also contain dense p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fucales Genera
The Fucales (fucoids) are an order in the brown algae (class Phaeophyceae). The list of families in the Fucales, as well as additional taxonomic information on algae, is publicly accessible at Algaebase. The class Phaeophyceae is included within the division Heterokontophyta.Hardy, G. and Guiry, M.D. 2006. ''A Check-list and Atlas of the Seaweeds of Britain and Ireland.'' 2006. The British Phycologcal Society. This name comes from the Greek word ''phaios'' meaning "brown" and ''phyton'' meaning plant.Huisman, J.M. 2000. ''Marine Plants of Australia''. University of Western Australia Press, Australia. They include some of the largest organisms in the sea, but some are small and fine in structure. Classification The Fucales include some of the more common littoral seaweeds and the members of the order have the typical seaweed construction: a holdfast, stipe, and lamina Lamina may refer to: People * Saa Emerson Lamina, Sierra Leonean politician * Tamba Lamina, Sierra Leonea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
