“
“In irrigated

rice paddies, episodic release of nitrous oxide (N2O) from the soil to the atmosphere has been observed during the first flood irrigation, but the biogeochemical mechanisms underlying these emissions remain unclear. To elucidate both microbial pathways of N2O production, consumption and emission processes of N2O from soil surfaces, we analyzed isotopomer ratios (bulk nitrogen and oxygen isotope ratios, delta N-15(bulk) and delta O-18, and intramolecular N-15 site preference, SP) of surface-emitted N2O and N2O in soil gas from paddy fields in Japan at the beginning of irrigation. Results indicate that surface-emitted N2O is produced at shallow depths above the rising groundwater table, and that it is emitted by diffusive transport through Selleck Emricasan air-filled soil pores. Immediately after soil surfaces are submerged, N2O accumulates in the soil because of the low diffusivity and high solubility of N2O in water. Isotopomer analysis revealed that high N2O emissions during the flooding process A-1155463 resulted mainly from N2O production by bacterial denitrification (nitrate reduction). Moreover, as soil submergence progressed, declining soil NO concentration promoted the use of N2O as an electron

acceptor. Thereby, most of the N2O was reduced to N-2. N2O emissions were increased by nitrogen fertilizer application before irrigation. The applied nitrogen fertilizer might enhance N2O production. (C) 2013 Elsevier Ltd. All rights reserved.”
“The smallscale yellowfin, Plagiognathops microlepis is the only one species in the genus Plagiognathops. In this study, we sequenced the complete mitochondrial genome of the P. microlepis. The complete mitogenome was 16,623 bp in size, consisting of 13 protein-coding genes, 22 transfer RNA (tRNA) genes, 2 ribosomal RNA (rRNA) genes,

selleck inhibitor and 1 control region. It has the typical circular molecule structure of vertebrate’s mitochondrial genome. The whole base composition was estimated to be 30.60% A, 25.19% T, 27.32% C and 16.89% G with AT bias of 55.79%. The complete mitogenome of P. microlepis provides the basis for preservation of genetic resources and genetic breeding studies on this species.”
“Previous microscopy-based studies in the eastern English Channel have revealed it to be a productive meso-eutrophic coastal ecosystem, characterized by strong repeating patterns in microplankton succession. The present study examines the seasonal structure of the entire protistan community from March 2011 to July 2013, using tag pyrosequencing of the V2-V3 hypervariable region of the 18S rRNA gene. A total of 1242 OTUs and 28 high-level taxonomic groups, which included previously undetected taxa in the area, were identified. The detected OTUs were considered according to taxon-specific traits, which included their trophic role, abundance and specialization level.