MODENUTTI Beatriz Estela
Effect of the Puyehue-Cordon Caulle volcanic complex eruption on crustacean zooplankton of Andean lakes
E. BALSEIRO,; WOLINSKY L; M. S. SOUZA,; BASTIDAS NAVARRO, M.,; C. LASPOUMADERES,; B. MODENUTTI,
ASOCIACIÓN ARGENTINA DE ECOLOGÍA
Lugar: Buenos Aires; Año: 2014 vol. 24 p. 75 - 75
ABSTRACT. We studied the effect of volcanic ash on the crustacean zooplankton (mainly cladocerans) in theAndean North-Patagonian lakes that were affected by the eruption of the Puyehue-Cordón Caulle complex.The study was carried out at three different scales: sub cellular, population and ecosystemic. Cladocerans arefilter feeding organisms that cannot distinguish between food (algae less than 30 μm) and suspended ash,therefore when feeding they ingest this material. The ash affected negatively the individuals at a biochemicallevel, increasing the oxidative stress reacting enzymes like Glutation-S-transferase and the biomarker Acetylcholinesterase. At the population level, we recorded a decrease in survival and fecundity, in particular, whenash concentration exceeded 8 mg/L, we observed that individuals did not reach adulthood. At the ecosystemlevel, we recorded a significant decrease of the intermediate trophic level (primary consumers) althoughproducers were positively enhanced by the eruption. The absence of these primary consumers may affect uppertrophic levels like fishes. Later, in the year following the eruption, we observed the resurgence of zooplanktonpopulations suggesting a fast recovery from the initial conditions.