Advertisement

Journal of Oceanography

, Volume 74, Issue 3, pp 319–325 | Cite as

Effect of bacterial activity on nutrient regeneration and release from bottom sediments

  • Jidapa Koomklang
  • Hitomi Yamaguchi
  • Kazuhiko Ichimi
  • Kuninao Tada
Original Article

Abstract

The effect of bacterial activity of surface sediment layer on nutrient regeneration and release from bottom sediment should be an important factor in estimating nutrient fluxes. In this study, core incubation experiments were conducted to investigate the bacterial activity in a shallow coastal area, Shido Bay, the Seto Inland Sea, from May to September 2016. High nutrient upward fluxes were observed in a high temperature period. Sodium azide (NaN3) was added to the overlying water of the core incubation experiment system to inhibit bacterial activity. The results of adding NaN3 showed that the bacteria could not only regenerate nutrients but also assimilate nutrients in the bottom sediments. Moreover, bacteria in the superficial layer, the top 2–3 mm layer of surface sediment (SL), markedly assimilated NH4 and PO4, although they did not assimilate Si(OH)4. Judging from these results, we concluded that the upward nutrient fluxes were fundamentally regulated by temperature, which affected the physicochemical processes and bacterial activity, because our previous study showed that the nutrient fluxes were scarcely affected by the activities of microphytobenthos, which were active only during winter when sufficient light penetrated to the seafloor.

Keywords

Surface sediments Superficial layer Nutrient flux Shido Bay The Seto Inland Sea 

Notes

Acknowledgements

We gratefully acknowledge the generous assistance of Mr. Koji Kishimoto, captain of the R/V Calanus III, and the students of the Biological and Chemical Oceanography Laboratory, Kagawa University, during the field study. We would like to thank Mr. Dennis Murphy, the United Graduate School of Agricultural Sciences, Ehime University, for his help with the English in the manuscript. This study was funded by JSPS KAKENHI (Grant no. JP26281009).

References

  1. Abe K, Nakagawa N, Abo K, Tsujino M (2014) Dissolution of silica accompanied by oxygen consumption in the bottom layer of Japan’s central Seto Inland Sea in summer. J Oceanogr 70:267–276CrossRefGoogle Scholar
  2. Abe K, Tsujino M, Kazama T, Nakagawa N (2015) Underestimation of nutrient fluxes due to possible bacterial activity during a core incubation experiment. J Oceanogr 71:263–270CrossRefGoogle Scholar
  3. Bidle KE, Azam F (1999) Accelerated dissolution of diatom silica by marine bacterial assemblages. Nature 379:508–512CrossRefGoogle Scholar
  4. Koomklang J, Ichimi K, Yamaguchi H, Tada K (2017) A role for a superficial sediment layer in upward nutrient fluxes across the overlying water-sediment interface. J Oceanogr.  https://doi.org/10.1007/s10872-017-0434-0 Google Scholar
  5. Loassachan N, Ichimi K, Tada K (2009) Evidence of microphytobenthic roles on coastal shallow water of the Seto Inland Sea, Japan. J Oceanogr 65:361–372CrossRefGoogle Scholar
  6. Srithongouthai S, Tada K (2015) Diffusive fluxes across sediment–water interface in the Seto Inland Sea, Japan. Int Adv Res J Sci Eng Technol 2(11):71–75CrossRefGoogle Scholar
  7. Srithongouthai S, Sonoyama Y, Tada K, Montani S (2003a) The influence of environmental variability on silicate exchange rates between sediment and water in a shallow-water coastal ecosystem, the Seto Inland Sea, Japan. Mar Pollut Bull 47:10–17CrossRefGoogle Scholar
  8. Srithongouthai S, Sonoyama Y, Tada K, Montani S (2003b) Annual cycle of ammonium and phosphate fluxes across the sediment–water interface in coastal marine environment (the Seto Inland Sea). Fish Sci 68(Suppl):600–603Google Scholar
  9. Tada K, Morishita M (1997) The changes of environmental chemical conditions and biomass on lower trophic levels in a coastal bay. Technol Bull Fac Agric Kagawa Univ 49:35–47Google Scholar
  10. Tada K, Koomklang J, Ichimi K, Yamaguchi H (2017) Negligible effect of the benthic on measuring the nutrient upward fluxes from coastal sediments. J Oceanogr 73:397–402CrossRefGoogle Scholar

Copyright information

© The Oceanographic Society of Japan and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Applied Biological Science, Faculty of AgricultureKagawa UniversityKagawaJapan
  2. 2.Department of Life Environment Conservation Science, The United Graduate School of Agricultural SciencesEhime UniversityKagawaJapan
  3. 3.Seto Inland Sea Regional Research CenterKagawa UniversityTakamatsuJapan

Personalised recommendations