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Biological oceanography
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AbstractNumerous studies have documented that during a relatively brief period the spring plankton bloom in temperate and high-latitude regions can deliver as much as half of the total annual input of organic carbon to the benthos. Further, it is known that the exact timing of the onset of phytoplankton blooms in relatively shallow inshore waters can be controlled by the amount of solar radiation received and hence is subject to variations in weather patterns, leading to interannual variations i...
AbstractFrom a transect between Brazil and Newfoundland in April 1983, a summary description of the phytoplankton species is that diversity decreases northward as conditions alter from equilibrium to nonequilibrium. These conditions do not increase the southern species adapted to impoverished nutrient but do increase species unadopted to impoverished nutrient. Diversity is related to equilibrium and adaptation in this way: (1) species belonging to a very diverse group occur under equilibrium con...
#1R. J. Larson (UPR: University of Puerto Rico)H-Index: 1
AbstractPelagia noctiluca is a common circumtropical, epipelagic scyphomedusa. It captures prey either on the ex- umbrella, tentacles, or oral arms. Ciliary activity and muscular contractions transport the prey proximally toward the stomach where the elongate gastric cirri attach to it and digestion begins. Prey of P. noctiluca medusae collected in inshore waters of Puerto Rico consisted of a wide variety of zooplankton (e.g., hydromedusae, ctenophores, copepods, chaetognaths, and fish eggs). Th...
AbstractThe vertical distribution of total micronekton with particular reference to decapods, euphausiids, and mysids between 10 m and 3,900 m in the Atlantic at 42° N, 17° W is discussed. The animals were taken in a series of RMT 8M hauls. The top 900 m were sampled by day and by night in discrete 100-m depth horizons. From 900 m to 3,900 m, and in a single, haul between 4,300 m and 4,500 m, 200-m depth horizons were fished either during the day or at night. Total micronektonic biomass was grea...
#1Brian PalenikH-Index: 42
#2David J. KieberH-Index: 34
Last.François M. M. MorelH-Index: 93
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AbstractSome phytoplankton are able to use various forms of dissolved organic nitrogen without initial transport into the cell. Instead, these phytoplankton utilize cell-surface enzymes to degrade these forms of nitrogen to NH4+ and several byproducts. Only the NH4+ is then taken up. In the case of the cell-surface amino acid or amine oxidases, the by-products are hydrogen peroxide and an α-keto acid or aldehyde, respectively. The characteristics of these enzymes are discussed along with their p...
#1Lawrence A. MysakH-Index: 38
#2William W. HsiehH-Index: 28
Last.Timothy R. ParsonsH-Index: 1
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AbstractFrom the cross-spectral analysis of 40–80 years of coastal sea level, sea surface temperature, and salinity data in the Northeast Pacific, we found coherent signals at frequencies of 0.09, 0.17–0.20, 0.33, and 0.43 cycles per year (corresponding to periods of 11, 5–6, 3, and 2.3 years). The strong 5–6 year oscillation, besides appearing in the sea level cross-spectrum, was manifested as a sea level-temperature oscillation near Vancouver Island, and as a sea level-salinity oscillation far...
#1Jefferson T. Turner (NMFS: National Marine Fisheries Service)H-Index: 38
#2Michael J. DaggH-Index: 2
AbstractFine-scale vertical zooplankton distributions were compared in October 1978 on a cross-shelf transect south of Long Island, New York, at a time-series station south of Long Island, and at a time-series station on Georges Bank. Samples were collected at 5 to 10-m depth intervals with a pumping system and fine mesh (102 μm) nets. The waters south of Long Island were strongly stratified, whereas those of Georges Bank were isothermal. Juvenile or adult copepods accounted for a mean of 91% of...
#1John McN. Sieburth (URI: University of Rhode Island)H-Index: 36
#2Maureen D. Keller (Bigelow Laboratory For Ocean Sciences)H-Index: 25
AbstractBacteria that oxidize methylated amines are ubiquitous in the sea. The likely source of these C1 substrates is the quaternary ammonium osmoprotectant, glycine betaine, which degrades to release trimethylamine (TMA), dimethylamine (DMA), and monomethylamine (MMA). Each of these compounds are successively oxidized to yield formaldehyde, formate, and CO2. The release of methylamines from nanoalgae was determined indirectly by the presence of MMA-oxidizing bacteria in cultures of oceanic alg...
AbstractThe total bacterial populations inhabiting Black Sea waters and sediments off Romania were examined quantitatively, and the aerobic, heterotrophic populations were examined both quantitatively and qualitatively. Results showed a large bacterial population in anoxic waters ( = 8.8 × 105 cells/ml) and sediments ( = 4.9 × 10” cells/g), as well as in the aerobic environments. A very small portion of the total population could be grown on a nonselective, organic medium ( = 2.4 × 102 cells/ml ...
#1Stewart W. Willason (UCSB: University of California, Santa Barbara)H-Index: 3
#2James L. Cox (UCSB: University of California, Santa Barbara)H-Index: 8
AbstractThree corroborative techniques—stomach fullness, gut fluorescence, and digestive enzyme activity (laminarinase)—were used to examine the feeding ecology of two common euphausiid species off the California coast. Euphausia pacifica showed a diel feeding periodicity: stomach fullness, gut pigment levels, and laminarinase activity increased at night when this species entered the surface waters (< 80 m). In situ phytoplankton consumption by E. pacifica was quite variable and was positively c...
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