caa a22 4500 605455376 CHVBK 20210128100212.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10872-015-0285-5 doi (NATIONALLICENCE)springer-10.1007/s10872-015-0285-5 Underestimation of nutrient fluxes due to possible bacterial activity during a core incubation experiment [Elektronische Daten] [Kazuo Abe, Mutsumi Tsujino, Takehiro Kazama, Norihisa Nakagawa, Katsuyuki Abo] Examinations of sediment core incubation and calculations of diffusive nutrient fluxes based on the difference between the nutrient concentration in pore water and that in the overlying water were carried out to evaluate the benthic fluxes of nutrients such as phosphate (PO4), ammonium (NH4), and silicic acid [Si(OH)4] from the sediment-water interface. Test surface-sediment samples were collected in the western area of the Seto Inland Sea in October 2013 and January 2014. They were incubated onboard the ship for intervals of approximately 40-90h, and changes in the concentrations of nutrients in the overlying water with incubation time were monitored. Furthermore, in order to inhibit bacterial activity, sodium azide (NaN3) was added to the overlying water of another incubation system, whereupon nutrient concentrations in the overlying water were observed to increase linearly with incubation time. On the other hand, when NaN3 was not added, a linear increase was observed in the Si(OH)4 concentration but not in those of PO4 and NH4. The calculated diffusive fluxes generally agreed with those obtained from core incubation with the addition of NaN3. These findings suggest that the elution of PO4 and NH4 from the sediment-water interface during a core incubation experiment can be affected by bacterial activity, which could potentially lead to the underestimation of benthic fluxes. Therefore, great care should be taken when carrying out incubations of surface sediment, and they should be performed along with calculations of diffusive fluxes. The Oceanographic Society of Japan and Springer Japan, 2015 Nutrients nationallicence Benthic flux nationallicence Core incubation nationallicence Sediment-water interface nationallicence Western Seto Inland Sea nationallicence Abe Kazuo National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut Tsujino Mutsumi National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut Kazama Takehiro National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut Nakagawa Norihisa National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut Abo Katsuyuki National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut Journal of Oceanography Springer Japan 71/3(2015-06-01), 263-270 0916-8370 71:3<263 2015 71 10872 https://doi.org/10.1007/s10872-015-0285-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10872-015-0285-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abe Kazuo National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut NATIONALLICENCE 700 1- Tsujino Mutsumi National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut NATIONALLICENCE 700 1- Kazama Takehiro National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut NATIONALLICENCE 700 1- Nakagawa Norihisa National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut NATIONALLICENCE 700 1- Abo Katsuyuki National Research Institute of Fisheries and Environment of Inland Sea, 2-17-5 Maruishi, 739-0452, Hatsukaichi, Japan aut NATIONALLICENCE 773 0- Journal of Oceanography Springer Japan 71/3(2015-06-01), 263-270 0916-8370 71:3<263 2015 71 10872