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Metabolism of cyanobacteria in anaerobic marine sediments. ArchiMer
Stal, L; Krumbein, W.
Two cyanobacteria isolated from marine microbial mats metabolized endogenous carbon reserves anaerobically in the dark. Microcoleus chthonoplastes reduced elemental sulfur to sulfide and Oscillatoria sp. additionally produced lactate in the absence of elemental sulfur. Under nitrogen fixing conditions, however, no sulfur reduction occurs. Lactate fermentation appeared to be the mechanism of anaerobic carbon degradation under these conditions. With a nitrogenase-reducible substrate, e.g. acetylene, added, lactate fermentation as well as sulfur reduction stops in cultures of Oscillatoria containing nitrogenase. In this case only ethylene production was observed. These cyanobacteria seem to possess the capability to carry out anaerobic dark metabolism...
Tipo: Text Palavras-chave: Oscillatoria; Microcoleus chthonoplastes; Cyanophyta; Metabolism; Chemical cycles; Algae; Anoxic sediments; Anaerobic respiration; Algal mats; Biogeochemistry; Fermentation; Sulfur; Nitrogen fixation; Nitrogen cycle.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-974.pdf
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Influence of environmental variables on planktonic and phytobenthic communities in earthen ponds at Makoba, Zanzibar OceanDocs
Kyewalyanga, M.S.; Mwandya, A.W..
A study was conducted between July 2002 and June 2003 to assess the role of salinity, temperature, pH and dissolved oxygen on the abundance of planktonic (phyto- and zooplankton) and phytobenthic (algal mats) communities in shallow (40 cm depth) earthen ponds at Makoba, Zanzibar. Among the zooplankton, rotifer abundance peaked during the rainy period (salinity of 27–42‰) while protozoa and copepods were most abundant during the dry period (max salinity of 70‰). However, no season effects were seen on the phytobenthos. The most abundant genera were Pseudonitzschia sp., Schizothrix sp., Microcoleus sp. and Oscillatoria sp. and in general, algal mats were available throughout the year. Other variables such as temperature, pH and oxygen concentration did not...
Tipo: Journal Contribution Palavras-chave: Pseudonitzschia; Schizothrix; Microcoleus; Oscillatoria; Environmental variables; Planktonic organisms Environmental conditions Salinity Temperature Fish ponds Algal mats Environmental conditions Salinity Temperature http://aims.fao.org/aos/agrovoc/c_32980 http://aims.fao.org/aos/agrovoc/c_6751 http://aims.fao.org/aos/agrovoc/c_7657.
Ano: 2004 URL: http://hdl.handle.net/1834/1109
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Assessment of types and abundance of live food for fish farming in Makoba Earthen ponds, Zanzibar, Tanzania OceanDocs
Kyewalyanga, M.S..
Surveys of naturally-occurring live food for fish in Makoba earthen ponds, Zanzibar were conducted from November 2001 to August 2002. This involved identification of dominant plankton in the water column as well as the composition of algal mats. The effect of nutrients on the composition and abundance of the organisms was also assessed. Protozoa were found to be the dominant zooplankton in the water column, followed by rotifers. The most abundant phytoplankton genera were Prorocentrum (13.4%), followed by Coscinodiscus (10.4%) and Diplopsalopsis (7.5%), while the benthic algal mats were dominated by cyanobacteria, mostly Spirulina (22%) and Oscillatoria (18.4%). To complement the surveys, a time-series experiment was conducted for 21 consecutive days to...
Tipo: Journal Contribution Palavras-chave: Prorocentrum; Coscinodiscus; Diplopsalopsis; Spirulina; Oscillatoria; Pyramimonas; Biddulphia; Microcystis Fish ponds Fishery management Phytoplankton Protozoan diseases Fish farms Fertilization (biological) Fish ponds Fishery management Phytoplankton http://aims.fao.org/aos/agrovoc/c_2929 http://aims.fao.org/aos/agrovoc/c_24026 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2004 URL: http://hdl.handle.net/1834/1082
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