Planktonic ciliates from an oligotrophic South Andean lake, Morenito Lake (Patagonia, Argentina)

Modenutti, Beatriz; Pérez, Gonzalo L.

doi:10.1590/s1519-69842001000300007

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…During the 20th century, human activity has affected Lake Moreno and its surrounding environment. This has included the introduction of exotic salmonid in AD 1910 that comprising Oncorhynchus mykiss (rainbow trout), Salmo trutta (brown trout) and Salvelinus fontinalis (brook trout) (Macchi et al, 2007), and deforestation, construction of suburban housing in the catchment since 1930, and a dam construction that artificially isolated Lake Morenito from MO in 1960 (Modenutti and P erez, 2001;Massaferro et al, 2005).…”

Section: Site Descriptionmentioning

confidence: 99%

Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes

Williams

Rieradevall

Suárez³

et al. 2016

Quat. res.

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Chironomid communities were studied in a sediment core collected from Lake Moreno Oeste, located in Nahuel Huapi National Park. A major change in midge assemblages occurred at ∼AD 1760, which was characterized by a decrease of “cold taxa” including Polypedilum sp.2 and Dicrotendipes, and an increase of “warm taxa” including Apsectrotanypus and Polypedilum sp.1. These taxa are likely related to climatic conditions concurrent with the end of a cold period at ∼AD 1500-1700 and the beginning of a drying climate at ∼AD 1740-1900 in northern Patagonia. Coarse tephra layers had low midge diversity; however they did not disrupt the climatic trend as the community recovered rapidly after the event. Since AD 1910, after the increase in suburban housing, fish introduction, and the construction of a road, there was an increase in the relative abundances of taxa typically associated with the littoral zone, such as Parapsectrocladius, Riethia, Apsectrotanypus, and some Tanytarsini morphotypes. The main change in the chironomid community appears to be associated with long-term climate change. At the beginning of the 20th century, other site-specific environmental factors (catchment change and fish introduction) altered the chironomid assemblages, making it more difficult to understand the relative importance of each driver of assemblage change.

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Section: Site Descriptionmentioning

confidence: 99%

Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes

Williams

Rieradevall

Suárez³

et al. 2016

Quat. res.

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“…Blume and Austrocedrus chilensis (D. Don) Florin et Boutleje. Planktonic communities of the lakes were previously described by Balseiro and Modenutti (1990), Balseiro et al (1997), Díaz and Pedrozo (1993), and Modenutti and Pérez (2001).…”

Section: Field Study and Samplingmentioning

confidence: 99%

Balance between primary and bacterial production in North Patagonian shallow lakes

et al. 2008

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The shallow Andean North Patagonian lakes are suitable environments for the evaluation of autotrophic and heterotrophic production under a scenario of high radiation in high dissolved organic matter (DOM) systems. We aimed to study the balance between primary and bacterial production in three shallow Andean lakes, in a summer sampling (high irradiance condition). Our hypothesis is that two factors would interact: high light and high DOM, affecting bacteria and algae. We carried out experiments of bacterial production (BP) by measuring [ 14 C]-L-leucine incorporation and PP by 14 C uptake in two fractions: picophytoplankton and phytoplankton [2 lm. Cell abundance, chlorophyll a, nutrients, DOM, light, and temperature were also measured. The contribution of picophytoplankton to total primary production (PP) was, in general, very high exceeding 50%. Picophytoplankton was photosynthetically more efficient than the larger autotrophs in all lakes. We observed a decrease in PP at surface levels due the high solar irradiances, while BP was not affected. Changes in the PP:BP ratios were observed in relation to DOM content and light effect. Our data indicate that the amount of available DOM drives the balance between PP and BP. However, solar radiation should be included as an important factor since PP:BP ratio may decrease because of PP photoinhibition.

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“…It is well known that ciliate communities are very dynamic, and their community structure may respond quickly to changing physical, chemical and biological conditions in the environment (Jezbera et al, 2003). Modenutti and Pérez (2001) also found that the presence of this large ciliate was related to food conditions, feeding mainly on rotifers. Here we observed a clear decline in the B. plicatilis biomass and abundance, which clearly dominated the zooplankton composition during the rest of the study period.…”

Section: Discussionmentioning

confidence: 86%

Impact of water input on plankton temporal dynamics from a managed shallow saline lake

Alfonso¹,

Zunino²

2017

Ann. Limnol. - Int. J. Lim.

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La Salada is a shallow saline lake located in the SW of the Pampas subject to significant water management, so the primary objective was to assess whether the water input and physicochemical parameters have an impact on the plankton assemblages over a two year period (2013-dry and 2014-wet). The plankton community structure and physicochemical variables showed substantial changes over the study period. La Salada hosted a plankton community characterized by low diversity and small sized organisms. The nanoplanktonic fraction organisms (2-20 mm) dominate the phytoplankton community. Ochromonas sp. showed the maximum abundance throughout the whole study period. The zooplankton community was dominated by rotifers, with a lack of cladocerans. Halotolerant species, e.g. the rotifer Brachionus plicatilis and the cyclopod Apocyclops sp. were the main species. The seasonal temperature and conductivity dynamics influence the plankton abundance dynamics in La Salada. The increment of nutrients and decrease of conductivity caused by the water input led to an increase in plankton biomass and shaped its composition. These findings emphasize that interactions between plankton, salinity, and nutrients are sensitive to the water input and they improve the understanding of the impact of adequate management decisions.

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Planktonic ciliates from an oligotrophic South Andean lake, Morenito Lake (Patagonia, Argentina)

Cited by 14 publications

References 9 publications

Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes

Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes

Balance between primary and bacterial production in North Patagonian shallow lakes

Impact of water input on plankton temporal dynamics from a managed shallow saline lake

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