cl_maintenanceAndUpdateFrequency
notPlanned
2658 record(s)
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draft
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This dataset shows the global distribution of seagrasses, and is composed of two subsets of point and polygon occurrence data. The data were compiled by UNEP World Conservation Monitoring Centre in collaboration with Dr Frederick T. Short (University of New Hampshire, USA). The boundaries do not represent actual ranges as seagrass are distributed in waters shallow enough for sunlight to penetrate. No surface area calculations should be attempted.
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This dataset represents the Longhurst provinces (1998) of the world
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Plastic pollution is ubiquitous throughout the marine environment, yet estimates of the global abundance and weight of floating plastics have lacked data, particularly from the Southern Hemisphere and remote regions. Here we report an estimate of the total number of plastic particles and their weight floating in the world’s oceans from 24 expeditions (2007–2013) across all five sub-tropical gyres, coastal Australia, Bay of Bengal and the Mediterranean Sea conducting surface net tows (N5680) and visual survey transects of large plastic debris (N5891). Using an oceanographic model of floating debris dispersal calibrated by our data, and correcting for wind-driven vertical mixing, we estimate a minimum of 5.25 trillion particles weighing 268,940 tons. When comparing between four size classes, two microplastic <4.75 mm and meso- and macroplastic >4.75 mm, a tremendous loss of microplastics is observed from the sea surface compared to expected rates of fragmentation, suggesting there are mechanisms at play that remove <4.75 mm plastic particles from the ocean surface.
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Despite the apparent importance of microphytobenthos and macroalgal populations as primary producers, primary productivity data and particularly data investigating the controls on primary productivity in WA shelf waters are sparse. We have investigated microphytobenthoc and macroalgal primary productivity in Marmion Lagoon by measuring oxygen evolution during a number of targeted incubations.
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Two mangrove sites and two seagrass sites were sampled in each region of the Gulf of Carpentaria; Weipa (between 1991 and 1994) and Groote Eylandt (between 1994 and 1995). The stable isotope ratios of seagrass, mangroves and prawns were measured, and the contribution of mangroves and seagrass to prawn food webs was estimated.
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This dataset contains results from a series of laboratory and field experiments on local grazer communities to determine the parameter values required by the COASEC (Coastal Ocean Ecology) model. These experiments are part of the second stage of the Perth Coastal Waters Study. These parameters were delta, the grazing demand (biomass of food eatern per biomass of grazer per day; beta, the assimilation constant (the difference between the food consumed and defecated as a percentage of the food consumed); micron, the mortality constant (the turnover rate of the community), and kg, the ratio of food available to food demand to satisfy 50% of maximum potential growth of grazer communities. Empirically derived parameter values for the main grazers, crustaceans and gastropods were very different from each other and from the default values in the model. Experiments indicated that both types of grazers primarily fed on periphyton and grazing rates varied between summer and winter. Grazing impacts on larger epiphytes are dependent upon the type of grazer and the species of epiphyte.
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Exploratory survey of Orange Roughy by the FV San Rankino south of Tasmania in 1992. This ship fished for Orange Roughy to support Southern Surveyor SS9201. The data includes station logs and catch composition.
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This record is an overview entry for biological data collected on Diamantina cruise Dm 1/62. This cruise took place in the northeast Indian Ocean, Banda Sea and Java Sea during 12 February to 25 March 1962, under the leadership of B. Newell & D. Rochford. Biological data collected on this cruise include primary production rates; organisms with/without chlorophyll, total particles and occurrence of dinoflagellates from phytoplankton stations; pigment samples; and zooplankton biomass. Please note: This metadata record is a preliminary entry derived from information in the cruise report. Individual data types - which may span several cruises - will be indexed separately within this metadata system in due course.
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Two studies were carried out (October 1993 and March 1994) each lasting 24 hours, at one site in the Embley River, Gulf of Carpentaria. Juvenile prawn samples were collected every 2 hours by hand scoop or beam trawl in the river. Data were collected on gut fullness, moult stage, and prey type and number.
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Hydrographic data from six cruises, between April 1976 and March 1977 in the Gulf of Carpentaira are presented. Physical quantities (temperature, salinity and sigma-t) and chemical properties (dissolved oxygen, nitrate and silicate) were measured, and are presented in an associated report both as values at the stations and as contour maps. These cruises began in 1975 with the initiation of the CSIRO Tropical Prawn Research Project, a new series of Gulf-wide cruises undertaken to study the larval ecology of penaeid prawns. Approximately 70 stations were occupied on each cruise (with the exception of KL 7/76 which made only three transects in the southern Gulf). Two types of hydrographic stations were undertaken. Type 'A' stations consisted of Nansen casts with bottles every 10m from the surface to the bottom, sampling temperature, salinity, oxygen, nitrate plus nitrite, nitrogen and silicate. Type 'B' stations were Nansen casts with three bottles (at the surface, at 10m depth and within 10m of the bottom) sampling the same parameters as the Type 'A' stations. The sigma-t values were calculated from the temperature and salinity values, and the percentage of oxygen saturation was calculated from the oxygen concentration, temperature and salinity data. The difference between surface and bottom values was also calculated for all properties. The six cruises included: FRV Kalinda: KL 4/76 April 1976 KL 7/76 June 1976 KL 9/76 September 1976 FV Judy B: JB 2/76 November 1976 FV Raptis Pearl: TP 1/77 January 1977 RV Sprightly: TP 3/77 March 1977