Picoplankton
Mostrando 1-12 de 40 artigos, teses e dissertações.
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1. Prokaryotic picoplankton distribution within the oxygen minimum zone of the central Mexican Pacific across environmental gradients
Resumo O picophytoplankton marinho tornou-se uma questão importante para compreender a ecologia global das formas fototróficas, devido à sua ampla distribuição e contribuição para a biomassa e a produtividade. Estudamos os pigmentos de abundância, distribuição e assinatura do picofitoplâncton procarionte Prochlorococcus e Synechococcus durante um
Braz. j. oceanogr.. Publicado em: 2018-06
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2. VariaÃÃo espaÃo-temporal do microzooplÃncton no estuÃrio do rio Botafogo - PE
The microzooplanktonic community has been recognized for a long time by its tremendous ecological importance in many aquatic ecosystems since they are capable of utilizing resources which are not available to the meso- and macrozooplanltonic fractions representing intermediates between the nano- and picoplankton and higher trophic levels. In estuarine enviro
Publicado em: 2009
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3. Componentes estruturais abiótico e biótico e caracterização do grau de trofia de gamboas do litoral sul do Paraná, Brasil.
xi Estudos relacionados com a qualidade da água em ambientes costeiros como baías, estuários e gamboas são importantes por serem regiões de alta produtividade e influenciadas por atividades antrópicas. Neste estudo foram avaliadas variáveis físicoquímicas e biológicas em diversas gamboas ao longo da costa do Estado do Paraná. Foram analisadas vari
Publicado em: 2006
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4. Measurement of marine picoplankton cell size by using a cooled, charge-coupled device camera with image-analyzed fluorescence microscopy.
Accurate measurement of the biomass and size distribution of picoplankton cells (0.2 to 2.0 microns) is paramount in characterizing their contribution to the oceanic food web and global biogeochemical cycling. Image-analyzed fluorescence microscopy, usually based on video camera technology, allows detailed measurements of individual cells to be taken. The ap
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5. Ecophysiological and Trophic Implications of Light-Stimulated Amino Acid Utilization in Marine Picoplankton
By using microautoradiography, light-stimulated utilization of dissolved amino acids for natural marine phytoplankton assemblages was demonstrated. The <2-μm-size (diameter) picoplankton, known to be a dominant fraction of marine primary production, revealed a widespread capability for this process. Autofluorescent (chlorophyll a-containing) picoplankton an
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6. Tangential flow filtration and preliminary phylogenetic analysis of marine picoplankton.
A procedure was developed for harvesting gram quantities of microbial biomass from oligotrophic waters, when mixed populations are present in low abundance. Picoplankton from Atlantic Ocean (Hydrostation S, Sargasso Sea) and Pacific Ocean (Aloha Station) sites were collected in a three-stage process: (i) collection of seawater through an intake covered with
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7. Experimental Tests of Nutrient Limitation in Freshwater Picoplankton
On the basis of correlative studies, picoplankton in Calder Lake, New York, are apparently unaffected by seasonal fluxes in nutrient (N and P) levels. In this small eutrophic lake, picoplankton (<2.0- to 0.2-μm size) and nanoplankton (<20 to >2 μm) predominate. Microplankton (>20 μm) are typically least important. Experiments were conducted in situ to tes
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8. Analysis of a marine picoplankton community by 16S rRNA gene cloning and sequencing.
The phylogenetic diversity of an oligotrophic marine picoplankton community was examined by analyzing the sequences of cloned ribosomal genes. This strategy does not rely on cultivation of the resident microorganisms. Bulk genomic DNA was isolated from picoplankton collected in the north central Pacific Ocean by tangential flow filtration. The mixed-populati
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9. Spatial Distribution, Structure, Biomass, and Physiology of Microbial Assemblages across the Southern Ocean Frontal Zones during the Late Austral Winter
We examined the spatial distributions of picoplankton, nanoplankton, and microplankton biomass and physiological state relative to the hydrography of the Southern Ocean along 90° W longitude and across the Drake Passage in the late austral winter. The eastern South Pacific Ocean showed some large-scale biogeographical differences and size class variability.
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10. Use of Inorganic Membrane Filters (Anopore) for Epifluorescence and Scanning Electron Microscopy of Nanoplankton and Picoplankton †
Inorganic membrane filters (Anopore) were examined qualitatively by epifluorescence and scanning electron microscopy to determine their suitability for the study of nanoplankton and picoplankton. Compared with filters currently used, the Anopore filters allowed for increased resolution of the specimen with epifluorescence microscopy because of filter flatnes
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11. An immunological approach to detect phosphate stress in populations and single cells of photosynthetic picoplankton.
In the marine cyanobacterium Synechococcus sp. strain WH7803, PstS is a 32-kDa cell wall-associated phosphate-binding protein specifically synthesized under conditions of restricted inorganic phosphate (P1) availability (D. J. Scanlan, N. H. Mann, and N. G. Carr, Mol. Microbiol. 10:181-191, 1993). We have assessed its use as a potential diagnostic marker for
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12. A Single Species, Micromonas pusilla (Prasinophyceae), Dominates the Eukaryotic Picoplankton in the Western English Channel
The class Prasinophyceae (Chlorophyta) contains several photosynthetic picoeukaryotic species described from cultured isolates. The ecology of these organisms and their contributions to the picoeukaryotic community in aquatic ecosystems have received little consideration. We have designed and tested eight new 18S ribosomal DNA oligonucleotide probes specific
American Society for Microbiology.