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Multiple-stressor effects on river biofilms under different hydrological conditions

Artikel i vetenskaplig tidskrift
Författare L Ponsati
Natàlia Corcoll
M Petrovic
Y Picó
A Ginebreda
E Tornés,
H Guasch
D Barceló
S Sabater
Publicerad i Freshwater Biology
Volym 61
Nummer/häfte 12
Sidor 2102-2115
ISSN 0046-5070
Publiceringsår 2016
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 2102-2115
Språk en
Länkar dx.doi.org/10.1111/fwb.12764
Ämnesord environmental pollution, nutrients, emerging contaminants, Mediterranean basin, epilithic biofilms, multivariate analysis
Ämneskategorier Limnisk ekologi, Hydrologi, Miljötoxikologi

Sammanfattning

.We studied the relative importance of environmental factors (river flow, nutrients, dissolved organic matter) and organic micro-pollutants [herbicides, insecticides, industrial organic compounds, personal care products, antibiotics and pharmaceuticals, (PhCs)] to the structure and function of epilithic biofilms under various hydrological conditions and land uses. .Biofilms from four river basins in the Iberian Peninsula (Llobregat, Ebro, Júcar and Guadalquivir) were analysed in summer–autumn during a wet period and base-flow conditions. The sites experienced different levels of pollution. .We used variance partitioning (Redundancy Detrended Analysis, RDA) to link environmental stressors to the structure and function of biofilms, which were assessed as diatom community composition, algal biomass, photosynthetic activity, bacterial density and extracellular phosphatase activity. .RDAs showed that industrial organic compounds, herbicides and PhC products were the pollutants most strongly associated with measures of biofilm structure and function, whereas dissolved inorganic nitrogen, dissolved organic carbon and hydrological variability were the environmental factors most strongly associated with biofilm responses. .Thicker biofilms developing during base flow were most affected by pollutants and nutrients. In contrast, thinner biofilms developing during periods of high river flow were less affected by chemicals.

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