Emergent spatial patterns of competing benthic and pelagic algae in a river network: A parsimonious basin-scale modeling analysis

lA river-network-scale model was developed for dynamics of pelagic-benthic algae.lThe model coupled parsimonious forms of hydrologic-geochemical-ecological processes.lDistinguished spatial patterns for the two algae emerged by stream-orders (ω).lAbrupt benthic-pelagic algal regime shift occurred in...

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Vydané v:Water research (Oxford) Ročník 193; s. 116887
Hlavní autori: Yang, Soohyun, Bertuzzo, Enrico, Büttner, Olaf, Borchardt, Dietrich, Rao, P. Suresh C.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: England Elsevier Ltd 01.04.2021
Predmet:
algae
aquatic habitat
autocorrelation
case studies
dynamic models
Ecosystem
energy
Environmental Monitoring
Eutrophication
geomorphology
Germany
habitat preferences
Hortonian scaling
phosphorus
Phosphorus - analysis
Regime shifts
riparian areas
river flow
Rivers
Spatial autocorrelation
urbanization
water
water quality
watersheds
Germany
Spatial autocorrelation
Hortonian scaling
Eutrophication
Regime shifts
ISSN:0043-1354, 1879-2448, 1879-2448
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Shrnutí:lA river-network-scale model was developed for dynamics of pelagic-benthic algae.lThe model coupled parsimonious forms of hydrologic-geochemical-ecological processes.lDistinguished spatial patterns for the two algae emerged by stream-orders (ω).lAbrupt benthic-pelagic algal regime shift occurred in the mid-ω streams.lData-model synthesis helps design monitoring-management for reducing algal blooms. Algae, as primary producers in riverine ecosystems, are found in two distinct habitats: benthic and pelagic algae typically prevalent in shallow/small and deep/large streams, respectively. Over an entire river continuum, spatiotemporal patterns of the two algal communities reflect specificity in habitat preference determined by geomorphic structure, hydroclimatic controls, and spatiotemporal heterogeneity in nutrient loads from point- and diffuse-sources. By representing these complex interactions between geomorphic, hydrologic, geochemical, and ecological processes, we present here a new river-network-scale dynamic model (CnANDY) for pelagic (A) and benthic (B) algae competing for energy and one limiting nutrient (phosphorus, P). We used the urbanized Weser River Basin in Germany (7th-order; ~8.4 million population; ~46 K km2) as a case study and analyzed simulations for equilibrium mass and concentrations under steady median river discharge. We also examined P, A, and B spatial patterns in four sub-basins. We found an emerging pattern characterized by scaling of P and A concentrations over stream-order ω, whereas B concentration was described by three distinct phases. Furthermore, an abrupt algal regime shift occurred in intermediate streams from B dominance in ω≤3 to exclusive A presence in ω≥6. Modeled and long-term basin-scale monitored dissolved P concentrations matched well for ω>4, and with overlapping ranges in ω<3. Power-spectral analyses for the equilibrium P, A, and B mass distributions along hydrological flow paths showed stronger clustering compared to geomorphological attributes, and longer spatial autocorrelation distance for A compared to B. We discuss the implications of our findings for advancing hydro-ecological concepts, guiding monitoring, informing management of water quality, restoring aquatic habitat, and extending CnANDY model to other river basins. [Display omitted]
Bibliografia:ObjectType-Article-1
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ISSN:0043-1354
1879-2448
1879-2448
DOI:10.1016/j.watres.2021.116887