The relative importance of water temperature and residence time in predicting cyanobacteria abundance in regulated rivers

Yoon Kyung Cha, Kyung Hwa Cho, Hyuk Lee, Taegu Kang, Joon Ha Kim

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

Despite a growing awareness of the problems associated with cyanobacterial blooms in rivers, and particularly in regulated rivers, the drivers of bloom formation and abundance in rivers are not well understood. We developed a Bayesian hierarchical model to assess the relative importance of predictors of summer cyanobacteria abundance, and to test whether the relative importance of each predictor varies by site, using monitoring data from 16 sites in the four major rivers of South Korea. The results suggested that temperature and residence time, but not nutrient levels, are important predictors of summer cyanobacteria abundance in rivers. Although the two predictors were of similar significance across the sites, the residence time was marginally better in accounting for the variation in cyanobacteria abundance. The model with spatial hierarchy demonstrated that temperature played a consistently significant role at all sites, and showed no effect from site-specific factors. In contrast, the importance of residence time varied significantly from site to site. This variation was shown to depend on the trophic state, indicated by the chlorophyll-a and total phosphorus levels. Our results also suggested that the magnitude of weir inflow is a key factor determining the cyanobacteria abundance under baseline conditions.

Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalWater Research
Volume124
DOIs
StatePublished - 2017

Keywords

  • Bayesian hierarchical model
  • Cyanobacteria
  • Overdispersed Poisson regression
  • Residence time
  • Rivers and streams
  • Temperature

Fingerprint

Dive into the research topics of 'The relative importance of water temperature and residence time in predicting cyanobacteria abundance in regulated rivers'. Together they form a unique fingerprint.

Cite this