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JPR Advance Access originally published online on March 30, 2004
Journal of Plankton Research 2004 26(7):753-762; doi:10.1093/plankt/fbh073
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Journal of Plankton Research Vol. 26 No. 7 © Oxford University Press 2004; all rights reserved

Mycosporine-like amino acids in planktonic organisms living under different UV exposure conditions in Patagonian lakes

Barbara Tartarotti1,*, Gustavo Baffico, Pedro Temporetti and Horacio E. Zagarese2

Universidad Nacional del Comahue, Centro Regional Universitario Bariloche, U.P. Universidad–8400 San Carlos de Bariloche, Argentina Present Adrresses: 1 Department of Marine Science, University of South Florida, 140 Seventh Avenue South, St Petersburg, FL 33701, USA and 2 Instituto de Investigaciones Biotecnológicas Instituto Tecnologico de Chascomus, Universidad Nacional de General San Martín Camino de Circunvalacion Laguna KM. 6 CC 164 (B7130IWA) Chascomus, Provincia de Buenos Aires, Argentina

* Corresponding Author: btartaro{at}marine.usf.edu

Mycosporine-like amino acids (MAAs) were studied in zooplankton from 13 Argentinian lakes covering a broad range in altitude, maximum depth and physico-chemical properties of the water. Four to nine different MAAs (predominantly porphyra-334 and shinorine) were found in the copepods Boeckella gibbosa, B. gracilipes, B. meteoris and Parabroteas sarsi, and in the ciliate Stentor amethystinus, while MAAs were undetectable in the cladoceran Daphnia middendorffiana. Among the different copepods, maximum MAA concentrations accounted for 0.25–1.31% of the dry weight, and contents were generally about three to seven times (up to 43 times) higher in the animals living in the clearest lakes compared to those occurring in low-UV systems. This variability in the content of MAAs was related to the lake altitude (r2 = 0.71), and the fraction of the water column to which 1% of the surface UV radiation at 320 nm penetrated (r2 = 0.57). Our data therefore underscore the role of MAAs as sunscreens to decrease the potential negative effects of solar radiation, but they also indicate that other environmental factors besides UV transparency play a role in determining MAA concentrations. One lake was selected to obtain additional information on the qualitative composition of MAAs in seston of <100 µm between two sampling sites and over a 2 month study period (austral summer). Six different MAAs were detected in the samples, with porphyra-334 and palythine being predominant. In the copepods collected simultaneously, there was low variation in MAA concentrations between the two sites and over time. Thus, our results suggest that under similar UV exposure conditions MAA contents of planktonic organisms show low temporal variation.


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