Showing papers by "Charles Yarish published in 1990"
Book•
01 Jan 1990
TL;DR: In this article, the authors present a taxonomic overview of SEAWEED VEGETATION, focusing on the cold and warm Temperate Regions of the Northern Hemisphere and the tropical regions of the Southern Hemisphere.
Abstract: DISTRIBUTION AND STRUCTURE OF SEAWEED VEGETATION. Seaweed Vegetation of the Cold and Warm Temperate Regions of the Northern Hemisphere. Seaweeds of the Arctic. Seaweed Vegetation of the Tropical Regions. Temperate and Polar Seaweed Vegetation of the Southern Hemisphere. ECOPHYSIOLOGY OF SEAWEEDS. Light. Temperature, Salinity, and Other Abiotic Factors. Biotic Factors in the Euphotic Zone: Strategies, Productivity of Seaweeds, and Commercial Uses. Bibliography. Taxonomic Overview of Genera. Index.
970 citations
TL;DR: Sporophyte production was more sensitive to light, temperature and nitrogen concentration than gametogenesis, and production of sporophytes was inhibited completely at 20 °C.
Abstract: A series of comparative culture experiments were conducted in order to determine responses of Laminaria longicruris male and female gametophytes and juvenile sporophytes to several temperatures (5, 10, 15, 20 °C), light levels (10, 35, 75 μmol m-2 s-1) and media nitrogen concentrations (0, 20, 100 μM ammonium-nitrogen). Responses were measured as numbers of male and female gametophytes producing gametangia and number of sporophytes produced following fertilization. Both male and female gametogenesis was reduced at 5 and 20 °C versus 10 and 15 °C. At 20 °C gametogenesis inhibition was greater with higher levels of ammonium-nitrogen concentration (100 μM). Sporophyte production was more sensitive to light, temperature and nitrogen concentration than gametogenesis. Production of sporophytes was inhibited completely at 20 °C. At lower temperatures, increasingly higher nutrient concentrations produced greater inhibition of production of sporophytes.
11 citations
TL;DR: A survey of 15 sites along of the Kenyan coast evaluated the potential for harvesting seaweeds and for establishing seaweed farms as mentioned in this paper and made recommendations for a national program of management and production for Kenya.
Abstract: Kenya is a net importer of agar and alginate based on recent government statistics, although it may have the potential to be self-sufficient or even an exporter of these phycocolloids. There is little information on carrageenan importation into Kenya since government statistics incorporate it as agar. Seaweeds are relatively unimportant in the Kenyan diet since they are consumed rarely by coastal people. A survey of 15 sites along of the Kenyan coast evaluated the potential for harvesting seaweeds and for establishing seaweed farms. Gracilaria appears to comprise the bulk of the low grade agar import, even though local species of this genus are widely distributed along the Kenyan coast. Major populations of Gelidium may be a potential source of high quality bacteriological grade agar. Eucheuma may be farmed locally to support the increasing local and regional demands for carrageenan. Recommendations for a national program of management and production for Kenya will be discussed.
11 citations