INVESTIGADORES
BALSEIRO Esteban Gabriel
congresos y reuniones científicas
Título:
Glacier melting, UVR impact and stoichiometric implications for zooplankton species distribution.
Autor/es:
BALSEIRO, E.G; MODENUTTI, B.E.; SOUZA, M.S.; LASPOUMADERES, C.; BASTIDAS NAVARRO, M.
Lugar:
Córdoba
Reunión:
Congreso; 16th International Photobiology Congress; 2014
Institución organizadora:
International Union of Photobiology
Resumen:
Glaciers around the globe are melting rapidly,
threatening the receiving environments of the world?s fresh water reservoirs
with significant changes. The meltwater, carried by rivers, contains large
amounts of suspended sediment particles, producing longitudinal gradients in
the receiving lakes. These gradients may result in changes in water
transparency affecting UVR penetration but also food quality for zooplankton by
changes the light-nutrient ratio in the water column. Lake Mascardi, located in
the North-Patagonian Adean lake district, is a deep ultra-oligotrophic lake
that receives the Upper Manso River, which begins at the largest glacier of
Tronador Mountain (3554 m a.s.l.). Glacier fluctuations on Mountain Tronador
have been observed since 1976 and show a continuous recession. We took
advantage of the light gradient in Lake Mascardi, analyzing interannual
variations in water transparency, UVR penetration and food quality as
interacting factors affecting zooplankton populations. We analyze the oxidative
stress due to UVR in Daphnia commutata
and how this factor can modulate the coexistence with other potential
competitors such as the copepod Boeckella
gracilipes. In addition, we found significant differences in light:nutrient
ratio and stoichiometric food quality of the seston, together with a switch
from dominance of P-rich Daphnia in
low carbon:nutrient stations to dominance of low-P copepods in high
carbon:nutrient stations. In summary, here we showed how climate change would
affect zooplankton via changes in water transparency and UVR effect.