INVESTIGADORES
ZAGARESE Horacio Ernesto
artículos
Título:
UV damage in shallow lakes: the implications of water mixing
Autor/es:
HORACIO ZAGARESE; WALTER CRAVERO,; BARBARA TARTAROTTI,; PABLO GONZÁLEZ,
Revista:
JOURNAL OF PLANKTON RESEARCH
Referencias:
Año: 1998 vol. 20 p. 1423 - 1433
ISSN:
0142-7873
Resumen:
The
plankton of shallow lakes is expected to experience increasing exposure to
ultraviolet radiation (UVR) within the next decades. In addition to
stratospheric ozone depletion, decreases in dissolved organic carbon (DOC),
caused by climate warming or acidification, will result in greater UVR
penetration in many lakes. Circulation
patterns induced by moderate winds force the plankton of shallow lakes to be
cycled through the whole water column. This translates into higher doses and
fluctuating dosage-rates. Here, we
report the results of a series of in situ UV exposure experiments in which
two zooplankton crustaceans (one capable of photorecovery and the other not),
were incubated either at fixed depths or under simulated mixing. Our main goal was to assess the extent to
which the results from static incubations could be extrapolated to vertically
moving zooplankton. Static incubations
accurately predicted the survival of moving individuals for the species without
photorecovery, but failed to do so for the species capable of
photorecovery. The fluctuations in
dosage-rate for high doses tended to increase the survival of the species with
photorecovery. We contend that
neglecting the effects of vertical mixing may result in a biased perception of
UVR effects in shallow lakes.