Volcanic nutrient inputs and trophic state of Lake Caviahue, Patagonia, Argentina

Pedrozo, Fernando; Temporetti, Pedro; Beamud, Guadalupe; Díaz, Mónica

doi:10.1016/j.jvolgeores.2008.06.018

Cited by 35 publications

(37 citation statements)

References 18 publications

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“…The drop in P concentration was explained by Pedrozo et al (2008) and related to changes in the magmatic activity of the Copahue Volcano. NH 4 concentration was low, possibly influenced by a decrease in volcanic fluids.…”

Section: Chemical and Biological Conditions In Lake Caviahuementioning

confidence: 97%

“…NH 4 concentration was low, possibly influenced by a decrease in volcanic fluids. Pedrozo et al (2008) clearly showed that NH 4 was the main fraction in dissolved inorganic N when compared with NO 3 concentration. In Lake Caviahue, the vertical distribution of NH 4 did not show any particular trend, and summer was the season in which the highest content was recorded.…”

Section: Chemical and Biological Conditions In Lake Caviahuementioning

confidence: 97%

“…Samples were taken in its northern arm, which presented a similar behavior with respect to the southern branch (Pedrozo et al Pedrozo et al (2001Pedrozo et al ( , 2008 2001; Varekamp 2003). Water samples for chemistry and phytoplankton count were collected with a 5-l Van Dorn bottle at depths of 0.2 and 5 m and every 10 m from 10 to 90 m. Light irradiance in the water column was measured for March 2004 with an LI-192SB underwater quantum sensor.…”

Section: Chemistry and Biologymentioning

confidence: 99%

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Nutrient limitation of phytoplankton in a naturally acidic lake (Lake Caviahue, Argentina)

2009

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As a result of a low pH, the inorganic carbon of acidic lakes is present as CO 2 at air-equilibrium concentration and is substantially lower than the inorganic carbon concentration in higher-pH waters with bicarbonate. This situation is quite common in artificially acidified lakes and where inorganic carbon is considered the limiting factor in phytoplankton growth. Apart from low inorganic carbon content, Lake Caviahue in Argentina has low nitrogen and high phosphorus content. The aim of this work was to assess the importance of inorganic carbon, phosphorus, and nitrogen, relating data on lake nutrients to phytoplankton species requirements. Lake samples taken in the 2004-2006 period did not show any particular trend in the vertical distribution of the water column of ammonium, inorganic carbon, and phosphorus with reference to either seasonality or depth. A decrease of some 15% in the lake's phosphorus concentration was observed over the same period. Although the total phytoplankton biomass in Lake Caviahue was similar throughout the period, a seasonal variation was observed. Lab bioassays were carried out with solutions of bicarbonates, ammonium, nitrates, and phosphate. We worked with three species separately, namely, two chlorophytes, Keratococcus rhaphidioides and Watanabea sp.; and one euglenophyte, Euglena mutabilis. Answers to specific nutrient requirements differed for each algal species: both chlorophytes prefer ammonium or nitrates added on their own, whereas the euglenophyte registered a higher growth rate with the joint addition of ammonium and phosphorus. Even when the limiting nutrient(s) for phytoplankton yield and rate varied between species, we observed a tendency for nitrogen limitation in Lake Caviahue.

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Section: Chemical and Biological Conditions In Lake Caviahuementioning

confidence: 97%

Section: Chemical and Biological Conditions In Lake Caviahuementioning

confidence: 97%

Section: Chemistry and Biologymentioning

confidence: 99%

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Nutrient limitation of phytoplankton in a naturally acidic lake (Lake Caviahue, Argentina)

2009

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“…Acidic hot springs on the eastern flank, Vertiente 1 and 2 (V1 and V2), are located *200 m below the crater rim and flow into the Upper Río Agrio (URA) that discharges into Lago Caviahue (CVL), an acidified lake of glacial origin (Fig. 9.2b) (Varekamp et al 2001(Varekamp et al , 2009Gammons et al 2005;Parker et al 2008;Pedrozo et al 2008;Varekamp 2008). Lago Caviahue has two arms and an outlet at the northern arm, the Lower Río Agrio (LRA), which joins the Río Trolope, which is largely meteoric water with some discharges from the geothermal system near Copahue village.…”

Section: Copahue Volcanomentioning

confidence: 99%

The Copahue Volcanic-Hydrothermal System and Applications for Volcanic Surveillance

Agusto

Varekamp

2015

Active Volcanoes of the World

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During the last two decades, Copahue and its active acidic crater lake have shown different magmatic, phreatomagmatic, and hydrothermal manifestations. Geochemical data of waters from Copahue springs, lakes and rivers provide new insights into the behavior of its volcano-hydrothermal system. Temporal variations in the chemical (major anions and cations) compositions, element fluxes, and isotopic fluctuations (δD and δ 18 O; stable Pb isotopes, 129 I/ 127 I, δ 37 Cl, δ 7 Li, δ 34 S) of surface waters from Copahue for the period 1997-2012 can be related to processes in the underlying hydrothermal system. The 2000 and 2012 eruptive periods and the 2004 thermal anomaly showed increases in SO 4 , Cl and F contents in the waters as a result of ascending magmatic fluids. The changing chemical compositions also showed evidence for enhanced water/rock interaction during these magmatic periods, with increased concentrations of the major rock forming elements such as Al, K and Mg. Soon after the magmatic events, the elemental fluxes from the hydrothermal system decreased strongly, especially for K and Al. The latter is related to a decrease in permeability in the system through crystallization of alunite. Stable isotopic data (δD and δ 18 O) indicate that the hydrothermal fluids consist of a mixture of meteoric and magmatic waters that are affected by evaporation and water/rock interaction processes. The δ 7 Li values, polythionate concentrations and water stable isotope ratios indicate that the hot spring M. Agusto

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“…If the P enters a volcanic lake, it may stimulate the biotic productivity, which could create a green lake. Geothermal nitrogen fluxes tend to be relatively small, although traces of ammonia and nitrate occur in geothermal systems and may provide the basis of the local food chains (Pedrozo et al 2001(Pedrozo et al , 2008. These lake colors are common compared to non-volcanic lakes, except that the source of the nutrients is here geothermal or volcanic and not anthropogenic.…”

mentioning

confidence: 99%

Volcanic Lakes

Christenson

Németh

Rouwet

et al. 2015

Advances in Volcanology

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Volcanic lakes are amongst the most spectacular natural features on the planet. These intersections of magmatic-hydrothermal systems and the Earth's surface are, poetically speaking, "blue windows" into the depth of a volcano (Fig. 1). The changing water compositions and colors of these lakes over time provide insights into the volcanic, hydrothermal and degassing processes of the underlying volcano.

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Volcanic nutrient inputs and trophic state of Lake Caviahue, Patagonia, Argentina

Cited by 35 publications

References 18 publications

Nutrient limitation of phytoplankton in a naturally acidic lake (Lake Caviahue, Argentina)

Nutrient limitation of phytoplankton in a naturally acidic lake (Lake Caviahue, Argentina)

The Copahue Volcanic-Hydrothermal System and Applications for Volcanic Surveillance

Volcanic Lakes

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