Nonlinear relationship of near-bed velocity and growth of riverbed periphyton

Mohamed Ateia, Mahmoud Nasr, Akira Ikeda, Hisako Okada, Manabu Fujii, Masafumi Natsuike, Chihiro Yoshimura

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Abstract

Artificial streams were set up to test the relationship between near-bed water velocity and periphyton growth. Periphyton community samples collected from a Japanese stream were incubated for 44 days under a light intensity of 252 ± 72 μmol˙photons/m2˙s, a temperature of 20-25 °C, and three near-bed water velocity classes: low (< 17.9 cm/s), moderate (17.9-32.8 cm/s), and high (> 32.8 cm/s). A logistic model was applied to estimate the maximum net growth rate (μmax) and carrying capacity (Bmax). A response surface method was also applied to estimate chlorophyll a (Chl-a) and ash-free dry mass (AFDM) with respect to the independent variables (i.e., time and water velocity). We detected both the highest μmax (1.99 d-1) and highest Bmax (7.01 mg/m2) for Chl-a at the moderate water velocity. For AFDM, we observed the highest μmax (0.57 d-1) and Bmax (1.47 g/m2) at the low and moderate velocity classes, respectively. The total algae density in the region of moderate velocity at the end of the experiment was 6.47 × 103 cells/cm2, corresponding to levels 1.7 and 1.3 times higher than those at lower and higher velocities, respectively. Our findings indicated that the moderate near-bed water velocity provided favorable conditions for algal growth and corresponding biomass accumulation.

Original languageEnglish
Article number461
JournalWater (Switzerland)
Volume8
Issue number10
DOIs
Publication statusPublished - 17 Oct 2016
Externally publishedYes

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Keywords

  • Logistic model
  • Near-bed water velocity
  • Periphyton growth
  • Response surface method

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Biochemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Ateia, M., Nasr, M., Ikeda, A., Okada, H., Fujii, M., Natsuike, M., & Yoshimura, C. (2016). Nonlinear relationship of near-bed velocity and growth of riverbed periphyton. Water (Switzerland), 8(10), [461]. https://doi.org/10.3390/w8100461