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Topic: Bacterioplankton

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	Bacterioplankton - Wikipedia, the free encyclopedia
		Bacterioplankton refers to the bacterial component of the plankton that drifts in the water column.
		Most bacterioplankton (for instance, Bacillus and Nitrosomonas) obtain their energy through decomposition of other organisms, which largely renders them dependent on the phytoplankton for the production of dissolved organic matter as their main food source.
		A few species of bacterioplankton are capable of photosynthesis and chemosynthesis.
	en.wikipedia.org /wiki/Bacterioplankton (153 words)

	NATURE VOL 361, 25 FEBURARY 1993
		Here we report that bacterioplankton activity in the surface layers of the oceans is suppressed by solar radiation by about 40% in the top 5 m of the water column in nearshore waters, whereas in oligotrophic open oceans suppression might be detectable to a depth of >lOm.
		Bacterioplankton from near-surface (0.5 m depth) waters of a highly stratified water column were as sensitive to surface UV-B radiation as subpycnocline bacteria, indicating no adaptative mechanisms against surface solar radiation in near-surface bacterioplankton consortia.
		In a stratified water column mixing is restricted and bacterioplankton in the surface waters may be exposed to high levels of UV-B during their entire life cycle, whereas bacterioplankton from the subpycnocline waters never experience noticeable levels of ultraviolet radiation.
	www.ciesin.org /docs/011-441/011-441.html (1043 words)

	Bacterioplankton and Picoplankton
		The effect of solar UV on bacterioplankton depends on the spectral attenuation coefficients in the water column and the time pattern of exposure and protection for the organisms as they are passively moved in the mixing layer.
		Bacterioplankton seems to lack UV screening pigments such as mycosporines or scytonemins, possibly because of their small size (Karentz et al., 1994; Garcia-Pichel, 1994).
		As a consequence, bacterioplankton are more prone to UV-B stress than larger eukaryotic organisms and exposure produces about double the amount of cyclobutane dimers as shown in a case study in the Gulf of Mexico (Jeffrey et al., 1996 a,b).
	www.gcrio.org /UNEP1998/UNEP98p36.html (409 words)

	Ian Hewson 2004 3425
		Bacterioplankton richness and diversity patterns in the estuary are potentially a consequence of greater niche availability, mixing of local and adjacent environment communities, or intermediate disturbance.
		Bacterioplankton communities in Moreton Bay (stations 3, 4, 5, and 6) were more similar to those at riverine stations (stations 1 and 2) than to oceanic sites (stations 7 and 8) when all observed OTU were used in the clustering analysis.
		Bacterioplankton diversity as measured by ARISA was not significantly correlated with salinity, nutrient (NO and PO) concentration, chlorophyll a, bacterial abundance, or distance (Table 2); however, salinity was 35.5 PSU at all sites except in the river (5.5 to 28.3 practical salinity units [PSU]).
	www.bionewsonline.com /s/w/ian_hewson_2004_3425.htm (5441 words)

	Jahrbuch-CD der MPG 2003 - Rapid turnover of dissolved DMS
		Flow cytometry was employed to discriminate subpopulations and to determine the numbers and biomass of bacterioplankton by staining for nucleic acids and proteins.
		Bacterioplankton subpopulations were separated by flow cytometric sorting and their composition determined using 16S ribosomal gene cloning/sequencing and fluorescence in situ hybridisation with designed group-specific oligonucleotide probes.
		Bacterioplankton turnover of DMS was also faster in the subsurface layer (12 h) compared to the surface layer (24 h).
	www.mpg.de /forschungsergebnisse/wissVeroeffentlichungen/archivListenJahrbuch/2002/53/publZIM81.html (424 words)

	BINAS: Library: BIOTECHNOLOGY RISK ASSESSMENT: MOLECULAR STUDIES OF ULTRAVIOLET RADIATION EFFECTS ON MARINE BACTERIA (Site not responding. Last check: 2007-11-03)
		During a series of research cruises in the Northern Gulf of Mexico we examined the relative proportion of DNA damage in the bacterioplankton size fraction (<0.8 µm) and what we are operationally defining as the eukayotic planktonic size fraction (>0.8 µm).
		Bacterioplankton were observed to have greater net accumulated photodamage at sunset than eukaryotic plankton.
		Bacterioplankton have been found to suffer up to twice as much DNA damage per unit DNA than larger planktonic organisms.
	www.bdt.fat.org.br /binas/Library/book/jeffrey.html (2292 words)

	Theses from Uppsala University : 266 - Temporal and spatial variation in the community composition of lake ...
		Bacterioplankton are among the smallest and most abundant organisms in lake ecosystems.
		The bacterioplankton community composition at different depths in two stratified lakes was investigated in a combined field survey and field experiment.
		Differences in bacterioplankton community composition were also found in five lakes of similar trophic status but different humic content.
	publications.uu.se /theses/abstract.xsql?lang=en&isbn=91-554-4351-6 (411 words)

	Citebase - Effect of appendicularians and copepods on bacterioplankton composition and growth in the English Channel
		The bacterioplankton composition did not change in the presence of either appendicularians or copepods, and generally the same proportions of bacterioplankton groups were determined.
		The reduction of bacterioplankton growth caused by appendicularian bacterivory was 0.4 to 14% ind.-1 l-1, and the total appendicularian population could reduce bacterial growth in coastal waters in late spring-summer by up to 9%.
		In contrast to the appendicularians the copepods stimulated bacterial growth, and in summer the bacterioplankton growth may be increased by up to 13% by the combined effect of dominant copepod populations.
	citebase.eprints.org /cgi-bin/citations?id=oai:eprints.soton.ac.uk:2051 (415 words)

	Aquatic Ecosystem Health and Management Society
		The base of the pelagic microbial food chain consists of bacterioplankton and mycoplankton (mostly thraustochytrids), the latter having drawn less attention.
		In a rather simplistic formulation, bacterioplankton is regarded as the harvester of autochthonous (marine) dissolved organic material exuded from phytoplankton, while mycoplankton is seen to be the scavenger of refractory dissolved organic material which is often allochthonous (riverine).
		Thraustochytrids may grow on terrestrial organic matter in the riverine input, which is often refractory to degradation, and play a role in enhancing carbon cycling in the estuarine and coastal areas.
	www.aehms.org /4_1_kimura.html (237 words)

	MOLECULAR STUDIES OF ULTRAVIOLET RADIATION EFFECTS ON MARINE BACTERIA
		Surface waters were collected prior to sunrise on March 18, 1994 at 28 27' N, 88 47' W and prefiltered through a 0.8 m cartridge filter (Nuclepore, Pleasanton, CA) to remove eukaryotic microorganisms and held in shallow (15 cm) containers at ambient seawater temperatures.
		During a series of research cruises in the Northern Gulf of Mexico we examined the relative proportion of DNA damage in the bacterioplankton size fraction (<0.8m) and what we are operationally defining as the eukayotic planktonic size fraction (>0.8 m).
		The importance of this is emphasized by the realization that bacterioplankton often account for the majority of cellular DNA in oligotrophic waters (Paul et al., 1985; Boehme et al., 1993; Fuhrman et al., 1989).
	www.nbiap.vt.edu /brarg/brasym94/jeffrey.htm (2305 words)

	DHEA, antibiotics, Weight Loss, buy Rx online, pharmaceuticals online, online pharmacy, Lutein, Tramadol, buy Tramadol, ... (Site not responding. Last check: 2007-11-03)
		Bacterioplankton Community Structure in a Maritime Antarctic Oligotrophic Lake during a Period of Holomixis, as Determined by Denaturing Gradient Gel Electrophoresis (DGGE) and Fluorescence in Situ Hybridization (FISH).
		The bacterioplankton community structure in Moss Lake, a maritime Antarctic oligotrophic lake, was determined with vertical depth in the water column, during the ice-free period on Signy Island in the South Orkney Islands.
		Bacterioplankton community structure was determined using a combination of direct counting of 4?,6-diamidino-2-phenylindole (DAPI) stained cells, PCR amplification of 16S rRNA gene fragments, denaturing gradient gel electrophoresis (DGGE) and in situ hybridization with group-specific, fluorescently labeled oligonucleotide probes.
	www.its.caltech.edu /~ung/ref-sequencing/sequencing-research-abs4.959.html (1543 words)

	EJPAU 2003. GOTKOWSKA-P£ACHTA A., NIEWOLAK S., KORZENIEWSKA E. VERTICAL DISTRIBUTION AND SEASONAL CHANGES IN THE ...
		The vertical distribution of bacterioplankton was usually of a micro-zonal character, indicating the 'focal' distribution of organic and nutrient matter, with higher population reported at the surface (during summer stratification at 1-5 m depth) or in demersal water that can be attributed to organic matter of auto- or allochtonic origin accumulating there.
		In lake waters the number of bacterioplankton is also affected by inorganic nitrogen, phosphorus, and organic carbon content, as well as by the bacteria-phytoplankton correlation [27].
		In 2000, a vertical stratification of bacterioplankton was more of a micro-zonal character, though the number of these bacteria was also lower in the surface water than at the depth of 0.3 m.
	www.ejpau.media.pl /series/volume6/issue2/environment/art-10.html (2036 words)

	Alke Bruns 2003 1980
		Dissolved ATP is utilized by natural bacterioplankton at high turnover rates ( 44), but its effect on the culturability of planktonic bacteria is not known.
		Freshwater bacterioplankton was chosen because such communities may contain around 550 species ( 29) and therefore are much less diverse and easier to investigate than soil microbial communities, in which bacterial diversity is 2 orders of magnitude higher ( 46, 50).
		In contrast to marine bacterioplankton ( 13), the well-known bacterial signal compounds BHL and OHHL had no effect on cultivation of heterotrophic bacteria from Zwischenahner Meer, which is in agreement with results of cultivation experiments with water from Lake Constance ( 14).
	www.bionewsonline.com /q/z/alke_bruns_2003_1980.htm (6356 words)

	AWI: Workshop on Artic Coastal Dynamics
		Bacterioplankton represent the largest living surface in the global ocean and at least half of the global oceanic primary production is channeled through bacterioplankton.
		Thus, dormancy, as a life strategy of bacterioplankton to overcome unfavorable environmental conditions, is regulated via the presence/absence of a bacterial capsule.
		Thus, we conclude that shifts in the carbohydrate composition in the DOM pool induce shifts in bacterioplankton community composition and that the plasticity of ectoenzyme expression in individual bacterioplankton species is rather limited.
	www.awi-bremerhaven.de /Workshops/ChemicalEcology.html (3106 words)

	A drop of ocean water tells a story
		About ten thousand bacterioplankton of the type SAR 11 are found in every drop of seawater.
		For decades marine scientists have been able to enumerate bacterioplankton and scientists have known that they are important to the cycling of nutrients in the ocean.
		The scientists found that the bacterioplankton SAR 11 comprises as much as 50 percent of the total surface microbial community (from zero to 140 meters below the surface) and 25 percent of the rest of the water column down to the bottom of the sea.
	www.brightsurf.com /news/dec_02/EDU_news_121902_b.html (786 words)

	Microbial Ecology - Biological Sciences
		The Microbial Ecology lab is a research unit of the Department of Biological Sciences, Virginia Institute of Marine Science, Gloucester Point, Virginia and the School of Marine Science of The College of William and Mary.
		Bacterioplankton are the smallest and most numerous autonomous organisms on the planet.
		Bacterioplankton are the most widely distributed organisms on earth, flourishing near geothermal vents in the deep sea, in polar sea ice, and all areas in between these extremes.
	www.vims.edu /bio/microbial (269 words)

	Jahrbuch-CD der MPG 2003 - Rapid Daphnia-mediated changes
		Shifts in morphological and taxonomical composition of bacterioplankton communities in response to protist and metazoan grazing were studied in bottle experiments, exposing bacterioplankton from a eutrophic clear-water pond, dominated by a large population of Daphnia magna, to a Daphnia gradient, ranging from 0 to 60 individuals per liter.
		Prior to the first experiment, the bacterioplankton community was shaped by protist grazing, while for the second experiment, bacterioplankton was pre-adapted to Daphnia grazing.
		In both experiments, rapid shifts in biomass and structure of the bacterioplankton community upon exposure to Daphnia grazing were observed.
	www.mpg.de /forschungsergebnisse/wissVeroeffentlichungen/archivListenJahrbuch/2002/22/publZIM2.html (272 words)

	Citebase - Coexistence of dominant groups in marine bacterioplankton community - a combination of experimental and ...
		Citation coverage and analysis is incomplete and hit coverage and analysis is both incomplete and noisy.
		The population dynamics in the coastal bacterioplankton community off Plymouth (UK) was studied in samples proportionally diluted (99%, 90%, 66% and 0%) with sterile seawater, incubated in the dark for 2â“4 days and monitored by flow cytometry.
		Using flow sorting and fluorescence in situ hybridization (FISH) with a set of ribosomal RNA targeted oligonucleotide probes, the phylogenetic composition of dominant cytometric groups of bacterioplankton was determined to be similar during growth in the dilution series.
	citebase.eprints.org /cgi-bin/citations?id=oai:eprints.soton.ac.uk:9881 (407 words)

	Projekte
		The bacterioplankton group studies the composition, diversity and population dynamics of heterotrophic bacteria in coastal and offshore marine pelagic habitats, and in lakes of various trophic states.
		The detection rates in bacterioplankton samples by CARD-FISH with a general bacterial probe (EUB338-HRP) were on average twice as high as with a monolabeled probe.
		Rapid turnover of dissolved DMS and DMSP by defined bacterioplankton communities in the stratified euphotic zone of the North Sea.
	www.mpi-bremen.de /Page211.html (4439 words)

	intas 96-1745 (Site not responding. Last check: 2007-11-03)
		This project is devoted to the investigation of biological self -purification processes based on vital activity of hydrobionts, by the example of microplankton and zoobenthos, and the assessment of ecological risk form the anthropogeneous contamination in the delta of the River Danube.
		One of the basic goals of this project is comprehensive investigation of specific features of structure and functioning of bacterioplankton and zoobethos, with the emphasis of their role in the organic-matter/energy cycle and in the water self -purification processes.
		Microbiological investigations included parameters characterising the structure and functioning of bacterioplankton, bacteria's general number, the number of the saprophytic bacteria, the degree of the bacterioplankton aggregation, the role of the bacterioplankton in destruction of organic matter, and calculations of the index of the bacterioplankton development.
	www.intas.be /catalog/961-1745.htm (866 words)

	Baylor University \|\| CRASR \|\| Lake and Reservoir Productivity
		Bacterioplankton and phytoplankton are linked – bacteria regenerate essential elements for algal use and algae provide organic substrate for bacteria use.
		Bacterioplankton abundance reduction will be measured by clearance of bacterioplankton from the media.
		Change in bacterioplankton number and cell size (selective predation) will be quantified by flow cytometry confirmed by epifluorescence direct counts and measurements.
	www.baylor.edu /crasr/index.php?id=18528 (1368 words)

	Fith European Marine Microbiology Symposium. Abstracts. The Role of Bacterioplankton in the Ecosystem of the Gulf of ... (Site not responding. Last check: 2007-11-03)
		The Role of Bacterioplankton in the Ecosystem of the Gulf of Gdansk.
		Total number and biomass of bacterioplankton were determined with the use of an epifluorescence microscope and polycarbonate filters stained with acridine orange.
		The highest thymidine incorporation rates were measured in summer where in the coastal zone the bacterioplankton activity in thymidine incorporation exceeded twofold the value obtained in the Gdansk Deep.
	www.fou.uib.no /fd/1997/f/414001/abstra25.htm (239 words)

	references
		Bunte, C., Simon, M. Bacterioplankton turnover of dissolved free monosaccharides in a mesotrophic lake.
		Weiss, M., Simon, M. Consumption of labile dissolved organic matter by limnetic bacterioplankton: the relative significance of amino acids and carbohydrates.
		Simon, M., Tilzer, M.M, Müller, H. Bacterioplankton dynamics in a large mesotrophic lake: I. abundance, growth and relationships to phytoplankton growth.
	www.icbm.de /bgp/8173.html (1665 words)

	Comparison of Cellular and Biomass Specific Activities of Dominant Bacterioplankton Groups in Stratified Waters of the ...
		Despite the sharp pycnocline, the vertical distribution of bacterioplankton at station G was uniform at ca.
		Bacterioplankton composition in lakes and oceans: a first comparison based on fluorescence in situ hybridization.
		Linking the composition of bacterioplankton to rapid turnover of dissolved dimethylsulphoniopropionate in an algal bloom in the North Sea.
	aem.asm.org /cgi/content/full/67/11/5210 (4904 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The possibility of UVBR mediated DNA damage accumulation in Antarctic marine phyto- and bacterioplankton was investigated from January-March 1998 at Rothera Station (70S, British Antarctic Survey).
		Furthermore, CPD abundance was studied in several size fractions of natural phyto- and bacterioplankton populations at various depths in the water column.
		Repair of damage was observed when populations were exposed to UVAR and PAR, but not with PAR alone, indicating that highest photolyase activity occurs upon exposure to radiation in the mid UVAR region.
	www.kumc.edu /POL/ASP_Home/Meetings/Annual2000/Sunday/view_abstract204.html (321 words)

	Untitled Document
		The genetic complexity of bacterioplankton communities was estimated to determine if hypolimnetic communities were more diverse than bacterial communities in the epilimnia of these lakes.
		Similarities between bacterioplankton communities present after the epilimnia formed were calculated to compare epilimnetic bacterioplankton in these different lakes.
		Bacterioplankton communities from the epilimnion and hypolimnion were different at the other sites examined in the Great Lakes.
	www.d.umn.edu /~rhicks1/picoplankton.html (1008 words)

	Bacterioplankton of the Kanev Reservoir and its Productional Characteristics - Begell House Inc. (Site not responding. Last check: 2007-11-03)
		The structure of bacterioplankton of the upper reaches of the Kanev reservoir, and also its productional, trophic, and dynamic characteristics, were studied.
		It has been found that in various seasons and years, and also in different sections of the reservoir, the numbers of bacterioplankton, its productional characteristics, and also the rate of its consumption, varied over a wide range.
		It has been shown that in the upper reaches of the reservoir the functioning of bacterioplankton in the impulse-stabilized state is conditioned by its successions.
	dx.doi.org /10.1615/HydrobJ.v39.i6.60 (139 words)

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