How length of light exposure shapes the development of riverine algal biomass in temperate rivers?

G. Várbíró, J. Padisák, Z. Nagy-László, A. Abonyi, I. Stanković, M. Gligora Udovič, V. B-Béres, G. Borics

Research output: Contribution to journalArticle

Abstract

The impact of cumulative daily solar radiation (CDSR) on the biomass of river phytoplankton (Chl-a) in the growing season was studied using a large dataset of rivers in the Carpathian Basin. The amount of solar radiation was cumulated over the range of 1–60 days. The CDSR–Chl-a relationship could be described by linear regression and appeared to be significant for almost all watercourses with the exception of rivers with short water residence time. To determine the most relevant time period of CDSR impacting phytoplankton biomass, the slopes of regressions were plotted against the accumulating number of days of light exposure (1–60). Two characteristic shapes were obtained: unimodal for rhithral rivers with hard substrate and steady increase for lowland potamal rivers with fine substrate. In both cases, there is an increasing tendency in the slope values with water residence time (WRT). It was demonstrated that CDSR has a pronounced impact on river phytoplankton biomass even in cases when WRT was shorter than the cumulated solar radiation period. These results indicate that development of phytoplankton within the river channel is a complex process in which meroplankton dynamics may have significant impacts. Our results have two implications: First, CDSR cannot be neglected in predictive modelling of riverine phytoplankton biomass. Second, climate models forecast increased drought with subsequently increased CDSR in several regions globally, which may trigger a rise in phytoplankton biomass in light-limited rivers with high nutrient concentrations.

Original languageEnglish
Pages (from-to)53-63
Number of pages11
JournalHydrobiologia
Volume809
Issue number1
DOIs
Publication statusPublished - Mar 1 2018

Fingerprint

solar radiation
phytoplankton
rivers
biomass
river
residence time
meroplankton
substrate
water
climate models
river channel
exposure
lowlands
climate modeling
nutrient content
growing season
drought
basins
nutrient
basin

Keywords

  • Cumulative daily solar radiation
  • Phytoplankton
  • Residence time

ASJC Scopus subject areas

  • Aquatic Science

Cite this

How length of light exposure shapes the development of riverine algal biomass in temperate rivers? / Várbíró, G.; Padisák, J.; Nagy-László, Z.; Abonyi, A.; Stanković, I.; Gligora Udovič, M.; B-Béres, V.; Borics, G.

In: Hydrobiologia, Vol. 809, No. 1, 01.03.2018, p. 53-63.

Research output: Contribution to journalArticle

Várbíró, G, Padisák, J, Nagy-László, Z, Abonyi, A, Stanković, I, Gligora Udovič, M, B-Béres, V & Borics, G 2018, 'How length of light exposure shapes the development of riverine algal biomass in temperate rivers?', Hydrobiologia, vol. 809, no. 1, pp. 53-63. https://doi.org/10.1007/s10750-017-3447-1
Várbíró, G. ; Padisák, J. ; Nagy-László, Z. ; Abonyi, A. ; Stanković, I. ; Gligora Udovič, M. ; B-Béres, V. ; Borics, G. / How length of light exposure shapes the development of riverine algal biomass in temperate rivers?. In: Hydrobiologia. 2018 ; Vol. 809, No. 1. pp. 53-63.
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