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Conditions d'apparition des rides d'écoulement et des rides d'oscillation sur les fonds affouillables
954
Oceanographic Abstracts
unity. However, when the data were compared within each of three months, the length of the daily operation time seemed to have little effect upon the number o f whale catches within that month. When the data ofcatch (y) were analysed in either one of two combinations o f the meteorological factors: wind force (x0, visibility (x.,) and the length of daylight time (xj), or the first two alone, little difference was found between the correlation coefficients o f the respective combinations. It was concluded that 30 to 50 per cent of the variance o f the whale catches possibly could be attributed to the first two factors, wind and visibility. LARRAS, J., 1963. Conditions d'apparition des rides d'ecoulement et des rides d'oscillation sur le,s fonds affouillables. C.R. Akad. Sci., Paris, 256 (26): 5512-5513. Synth~se des r6sultats publi6s jusqu'b, ce jour par I'emploi des m6mes rapports sans dimensions pour les deux sortes de rides. LEBEDEV, E. M., Y. E. PERMITIN and N. I. KARAJEVA.1963. On the question of fouling of plates in the Black Sea. (In Russian). Trudy Inst. Okeanol., USSR Akad. Naldc, 70: 270-275. The leading forms o f macrofouling on experimental plates exposed in Gelendzhick Bay were bryozoans, Lepralia pallasiana, Balanus improvist~s, B. eburneus, Mvtilus galloprovincialis and diatoms. An average total weight o f fouling was !.23 kg/m 2. Barnacles settling on varnished, experimental plates in summer easily penetrated it within three days. The varnish was not damaged by other organisms. LEWIS, JOHN B., IVAN GOODBODY and JOHN R. BEERS, 1962. An AIML Cooperative study of primary production in tropical and subtropical waters. (Abstract). Ass. Island. Mat'. Labs., 4th Meet., Curafao, 18-20. Nov., 1962: 23. It has been generally suggested that the rate of organic production in tropical oceanic waters is uniformly low and constant throughout the year. However, data to support this hypothesis comes only from widely scattered observations carried out for brief periods. The possibility of a cooperative study of the ecology of marine plankton populations at regular intervals at several laboratories in tropical Atlantic and Caribbean waters was discussed at the AIML meeting in Jamaica (April 1960). In March, 1961, the Office of Naval Research provides funds for such a programme for a two year period under the direction o f Dr. David W. Menzei of the Bermuda Biological Station. The proposal called for each participating laboratory to occupy its deep-water station at approximately monthly intervals. Records o f temperature and salinity are made for depths of 0, 15, 25, 50, 75, 100, 150, 200, and 250 m. In addition, a water sample is collected at each depth for the chemical analysis of its NO3 ~ NO,-N, NO,-N, NH3-N, PO~-P, and SiO3-S content. Primary production is measured by ihe C H method. /~lso, a 2 1. sample of surface water is filtered for the determination o f chrophyll. A 15 min surface zooplankton tow is taken at each station for a measurement o f the standing crop of zooplankton. In addition to Bermuda, two island laboratories have thus far taken an active part in the programme. Bellairs Research Institute of McGill University in Barbados, under the direction of Dr. John B. Lewis, joined the programme in March, 1961, and to date have completed twentyseven stations. Extensive preliminary studies were carried out to locate the station away from possible land influences. Levels of primary production have been generally low and comparable to the minimum in the Bermuda region (Menzel and Ryther, 1960). Work on the programme started in Jamaica in March, 1962. This has been carried on by Professor David W. Steven o f the University of the West Indies in Mona. In addition to the deepwater station located 7 miles off the South coast, comparative studies have been initiated using three inshore stations (1) inside the barrier reef, (2) at the mouth of Kingston Harbour, and (3) at the head of the Harbour. Rates of primary production have bzen markedly higher at the inshore stations. Production at the off-shore station has generally been comparable to the low summer values at Bermuda and is indicative o f nutrient depleted waters. LINSKENS, H. F., 1963. Overfl~ichenspannung an Marinen Algcn. Proc. Set'. C. Biol..~ted.
Sci. 66 (2): 205-217. (Konink) Neder. Akad. Wetens. The surface tension on different thalli of algae was determined using an elevating platform in combination with a torsion balance with a horizontal plate. The surface tension of the spzcics investigated varied between 24 and 354 dyn/cm and is characteristic for a species in a definite stage of development. In a few cases a regular pattern of regional variation in surface tension was found on the thallus. The relation between surface tension and the adhesion o f epiphytic algae as well as the connection with anatomical structure was discussed.
LONGUET HIGGINS, M. S.. 1962. Resonant interactions b:tween two trains of gravity waves. J. Fluid. Mech., 12: 321-332. Also in: Coll. Reprints, Nat. Inst. Oceanogr., Wormlcy, 10. In a previous paper, Phillips (1960) showed that two or three trains of gravity waves may interact so as to produce a fourth (tertiary) wave whose wave-number is different from any of the three primary wave-numbers k~, k2, k3, and whose amplitude grows in time. Such resonant interactions may produce an appreciable modification of the spectrum of ocean waves within a few hours. In this
Oceanographic Abstracts
unity. However, when the data were compared within each of three months, the length of the daily operation time seemed to have little effect upon the number o f whale catches within that month. When the data ofcatch (y) were analysed in either one of two combinations o f the meteorological factors: wind force (x0, visibility (x.,) and the length of daylight time (xj), or the first two alone, little difference was found between the correlation coefficients o f the respective combinations. It was concluded that 30 to 50 per cent of the variance o f the whale catches possibly could be attributed to the first two factors, wind and visibility. LARRAS, J., 1963. Conditions d'apparition des rides d'ecoulement et des rides d'oscillation sur le,s fonds affouillables. C.R. Akad. Sci., Paris, 256 (26): 5512-5513. Synth~se des r6sultats publi6s jusqu'b, ce jour par I'emploi des m6mes rapports sans dimensions pour les deux sortes de rides. LEBEDEV, E. M., Y. E. PERMITIN and N. I. KARAJEVA.1963. On the question of fouling of plates in the Black Sea. (In Russian). Trudy Inst. Okeanol., USSR Akad. Naldc, 70: 270-275. The leading forms o f macrofouling on experimental plates exposed in Gelendzhick Bay were bryozoans, Lepralia pallasiana, Balanus improvist~s, B. eburneus, Mvtilus galloprovincialis and diatoms. An average total weight o f fouling was !.23 kg/m 2. Barnacles settling on varnished, experimental plates in summer easily penetrated it within three days. The varnish was not damaged by other organisms. LEWIS, JOHN B., IVAN GOODBODY and JOHN R. BEERS, 1962. An AIML Cooperative study of primary production in tropical and subtropical waters. (Abstract). Ass. Island. Mat'. Labs., 4th Meet., Curafao, 18-20. Nov., 1962: 23. It has been generally suggested that the rate of organic production in tropical oceanic waters is uniformly low and constant throughout the year. However, data to support this hypothesis comes only from widely scattered observations carried out for brief periods. The possibility of a cooperative study of the ecology of marine plankton populations at regular intervals at several laboratories in tropical Atlantic and Caribbean waters was discussed at the AIML meeting in Jamaica (April 1960). In March, 1961, the Office of Naval Research provides funds for such a programme for a two year period under the direction o f Dr. David W. Menzei of the Bermuda Biological Station. The proposal called for each participating laboratory to occupy its deep-water station at approximately monthly intervals. Records o f temperature and salinity are made for depths of 0, 15, 25, 50, 75, 100, 150, 200, and 250 m. In addition, a water sample is collected at each depth for the chemical analysis of its NO3 ~ NO,-N, NO,-N, NH3-N, PO~-P, and SiO3-S content. Primary production is measured by ihe C H method. /~lso, a 2 1. sample of surface water is filtered for the determination o f chrophyll. A 15 min surface zooplankton tow is taken at each station for a measurement o f the standing crop of zooplankton. In addition to Bermuda, two island laboratories have thus far taken an active part in the programme. Bellairs Research Institute of McGill University in Barbados, under the direction of Dr. John B. Lewis, joined the programme in March, 1961, and to date have completed twentyseven stations. Extensive preliminary studies were carried out to locate the station away from possible land influences. Levels of primary production have been generally low and comparable to the minimum in the Bermuda region (Menzel and Ryther, 1960). Work on the programme started in Jamaica in March, 1962. This has been carried on by Professor David W. Steven o f the University of the West Indies in Mona. In addition to the deepwater station located 7 miles off the South coast, comparative studies have been initiated using three inshore stations (1) inside the barrier reef, (2) at the mouth of Kingston Harbour, and (3) at the head of the Harbour. Rates of primary production have bzen markedly higher at the inshore stations. Production at the off-shore station has generally been comparable to the low summer values at Bermuda and is indicative o f nutrient depleted waters. LINSKENS, H. F., 1963. Overfl~ichenspannung an Marinen Algcn. Proc. Set'. C. Biol..~ted.
Sci. 66 (2): 205-217. (Konink) Neder. Akad. Wetens. The surface tension on different thalli of algae was determined using an elevating platform in combination with a torsion balance with a horizontal plate. The surface tension of the spzcics investigated varied between 24 and 354 dyn/cm and is characteristic for a species in a definite stage of development. In a few cases a regular pattern of regional variation in surface tension was found on the thallus. The relation between surface tension and the adhesion o f epiphytic algae as well as the connection with anatomical structure was discussed.
LONGUET HIGGINS, M. S.. 1962. Resonant interactions b:tween two trains of gravity waves. J. Fluid. Mech., 12: 321-332. Also in: Coll. Reprints, Nat. Inst. Oceanogr., Wormlcy, 10. In a previous paper, Phillips (1960) showed that two or three trains of gravity waves may interact so as to produce a fourth (tertiary) wave whose wave-number is different from any of the three primary wave-numbers k~, k2, k3, and whose amplitude grows in time. Such resonant interactions may produce an appreciable modification of the spectrum of ocean waves within a few hours. In this