Dissolved phosphorus uptake in subtropical and temperate streams of Argentina

GULTEMIRIAN MARÍA DE LOURDES; GIORGI ADONIS; FEIJOÓ CLAUDIA; RODRIGUEZ CASTRO CAROLINA; FERNÁNDEZ HUGO RAFAEL

LIMNETICA

ASOC ESPAN LIMNOL-MISLATA

Lugar: Barcelona; Año: 2018 vol. 37 p. 283 - 296

0213-8409

Phosphate retention processes in streams of a subtropical and a temperate region were studied. Our hypothesis was that retentiondiffers in the two regions. We expect more retention in the subtropical region than in the temperate one. If that were confirmedthe differences in stream phosphate uptake may be driven by an interaction between phosphate concentration and algal biomass,associated with differences in temperature. Phosphate retention was studied by carrying out constant rate additions. Nutrientuptake rate (U) and mass transfer coefficient (Vf: 2.67 E-04 y 9.27 E-05 m/s to subtropical streams and temperate one respectively)were associated with background phosphate, macrophyte biomass and transient zone storage according to PCA analysis.Thus, streams of temperate regions respond more to macrophyte biomass than streams of subtropical regions which were associatedprincipally to benthic algae. These results are novel for South America and they reflect the relative importance of benthicalgal or macrophyte biomass and production in relation to the P uptake rate at the different environments