Seasonal dynamics of plankton in a mountain lake in the southern Alps (Laghetto Inferiore, Switzerland)

Simona, Marco; Barbieri, Alberto; Veronesi, Mauro; Malusardi, Stefano; Straškrabová, Vêra

doi:10.4081/jlimnol.1999.169

Cited by 10 publications

(7 citation statements)

References 12 publications

(12 reference statements)

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“…The taxa found in integrated samples in the water column, some sporadically, during the survey were classified into 35 categories (Simona et al 1999). The smallest algae were grouped together as nanoplankton, distinguishing between flagellate and non‐flagellate forms.…”

Section: Resultsmentioning

confidence: 99%

“…The list of the zooplankton species in Laghetto Inferiore is reported in Simona et al (1999). Figure 8 shows the trends in zooplankton density over the two years of the study.…”

Section: Resultsmentioning

confidence: 99%

“…This paper presents these chemical results as the first stage of a more detailed examination of the results which will be made in comparison with the other lakes studied in the MOLAR project. The biology of Laghetto Inferiore has been treated in greater detail in other publications (Simona et al 1999; Barbieri and Mosello 2000).…”

Section: Introductionmentioning

confidence: 99%

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Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)

2001

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Since 1980, surveys have been performed nearly every three years on approximately 50 small high altitude alpine lakes located in the Swiss part of the Lake Maggiore watershed. On the basis of this information, since 1996 Laghetto Inferiore has been included in the Mountain Lakes Research (MOLAR) project, an extensive European cooperative research project with 23 partners. Laghetto Inferiore is located at 2074 m a.s.l.; its watershed is mainly composed of crystalline silicic rocks; it has a maximum depth of 33 m, and a theoretical renewal time of 41 days. The pH of the water is approximately 5.6; the alkalinity of the surface water is approximately 30 μmol and that of the bottom water approximately 60 μmol. Chemical studies were performed on the inputs from atmospheric deposition and the main tributary streams, the lake concentration (on a monthly basis), and the outflow. The results show that the characteristics of summer deposition (rain) differ significantly from those of winter deposition (snow). By means of a budget model it was possible to distinguish between the contribution from atmospheric deposition and the contribution from weathering. Biological studies revealed a considerable variety of phytoplankton species and a scarcity of zooplankton species. The vertical distribution of the main algal species shows a marked vertical stratification, with biomass concentrations higher in the profundal. Along this profile, the species of the same taxonomic class tend to gather in a particular depth band, while the single classes tend to be distributed at different depths, according to their specific light requirements.

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Section: Resultsmentioning

confidence: 99%

“…The list of the zooplankton species in Laghetto Inferiore is reported in Simona et al (1999). Figure 8 shows the trends in zooplankton density over the two years of the study.…”

Section: Resultsmentioning

confidence: 99%

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Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)

2001

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“…We assumed that the difference is due to the distinct sampling season (spring and autumn). Seasonal succession of phytoplankton in freshwater ecosystems (e.g., Padisák et al, 2006) is typically characterized by a spring diatom bloom and a less intense autumn bloom (e.g., Hinder et al, 1999;Simona et al, 1999). In Lake Stechlin, an explicit spring maximum and a moderate summer maximum of phytoplankton biomass can be observed.…”

Section: Resultsmentioning

confidence: 99%

Spatial and temporal patterns of benthic diatom flora in Lake Stechlin, Germany

Szabó¹,

Padisák²,

Selmeczy³

et al. 2017

Turk J Bot

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IntroductionThe Baltic Lake District in northeastern Germany is composed of a multitude of lakes originated during the last glacial period (~12,000 years before). Some of the lakes are pristine and considered to represent high status in terms of the European Water Framework Directive. Lake Stechlin represents a highly valuable ecosystem. It belongs to the type of stratified lowland lakes with small catchment area and high content of calcite (Mathes et al., 2002). It is one of the most extensively studied lakes in northern Germany. Regular monitoring of its main limnological variables and biota was set in the 1950s in the context of the operation of a nuclear power plant (NPP) between 1966 and 1989. Through an external circulation system, the NPP's cooling water was taken from Lake Nehmitz, the heated water was pumped into Lake Stechlin, and diverted back to Lake Nehmitz (Casper, 1985;Koschel et al., 2002).Phytoplankton of Lake Stechlin has been studied since 1959 (Casper, 1985), and water chemistry and primary production measurements using the 14 C-technique started in 1970 (Koschel, 1974). Since 1994, a sampling program has been carried out to investigate the species composition and succession of phytoplankton (Padisák et al., 1998(Padisák et al., , 2010 and the occurrence of deep chlorophyll maxima (DCM) formed by cyanobacteria (Padisák et al., 1997(Padisák et al., , 2010Selmeczy et al., 2016). In the last decade, an increasing abundance of cyanobacterial blooms indicated a change in water quality (Padisák et al., 2010;Üveges et al., 2012).Diatom research in Lake Stechlin focused mainly on planktonic Centrales taxa. The population dynamics of two phycogeographically restricted unicellular diatom species were described (Cyclotella tripartita and Stephanocostis chantaicus -Scheffler and Padisák, , 2000. In 1999, spatial and temporal changes in spring planktonic diatom populations were studied (Padisák et al., 2003). Scheffler et al. ( , 2005 investigated the relationship between Cyclotella comensis and Cyclotella pseudocomensis with morphological, ecological, and molecular methods. Contrary to extensive and detailed phytoplankton studies, attached diatoms of the lake received much less scientific interest. In 1974 and 1975 (thermal load period), biomass and primary production of periphyton in the littoral zone were determined. Thereafter, a list of diatom taxa found in the probes was compiled and published in Casper's (1985) synthesis. Scheffler and Schönfelder (2004) reported the Abstract: Phytoplankton and planktonic centric diatoms of Lake Stechlin have been extensively studied, while attached diatoms have received much less scientific interest. In the present study, the composition of benthic diatoms and their diversity metrics were determined and compared along the shoreline of the lake in spring 2013 and autumn 2014. Overall, 118 taxa classified in 52 genera were found, of which 15 species belonged to threat categories of the Red List for Central Europe. Species richness (33 ± 4), Shannon diversity (2.47 ± ...

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“…In zooplankton seasonal succession, communities of a few large species give way to communities of smaller, more diverse s in late spring or early summer (Sommer, 1989;Caceres, 1998). Simona et al (1999) did not find seasonal succession in a mountain lake in the Alps. From the article written by Ferrara, Vagaggini and Margaritora (2002) we are able to form a notion of zooplankton, dominated by an Eudiaptomus species, where cladocerans peaked in summer and in autumn.…”

Section: Seasonal Dynamics Of Zooplanktonmentioning

confidence: 99%

Evaluation of Climate Change Scenarios Based on Aquatic Food Web Modelling

VADADI-FÜLÖP¹

2007

Appl Ecol Env Res

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Budapest, H-1118 Budapest, Villányi út 29-33, Hungary (phone: +36-1-372-6261; fax: +36-1-466-9273) *e-mail: vadfulcsab@gmail.com Abstract. In the years 2004 and 2005 we collected samples of phytoplankton, zooplankton and macroinvertebrates in an artificial small pond in Budapest. We set up a simulation model predicting the abundance of the cyclopoids, Eudiaptomus zachariasi and Ischnura pumilio by considering only temperature as it affects the abundance of population of the previous day. Phytoplankton abundance was simulated by considering not only temperature, but the abundance of the three mentioned groups. This discrete-deterministic model could generate similar patterns like the observed one and testing it on historical data was successful. However, because the model was overpredicting the abundances of Ischnura pumilio and Cyclopoida at the end of the year, these results were not considered. Running the model with the data series of climate change scenarios, we had an opportunity to predict the individual numbers for the period around 2050. If the model is run with the data series of the two scenarios UKHI and UKLO, which predict drastic global warming, then we can observe a decrease in abundance and shift in the date of the maximum abundance occurring (excluding Ischnura pumilio, where the maximum abundance increases and it occurs later), whereas under unchanged climatic conditions (BASE scenario) the change in abundance is negligible. According to the scenarios GFDL 2535, GFDL 5564 and UKTR, a transition could be noticed. Keywords: hydrobiology, community, ecosystem, climate change Introduction and aimsThe concept of seasonal dynamics is published in several forms. It has been come out like "seasonal variation", seasonal changes" or "seasonal cycle" considering changes in the abundance, biomass or in the composition of assemblage. From our point of view, seasonal dynamics is temporal change in the examined assemblage, which is regulated by the climate, primarly by the temperature. It has been shown that abundance and structure of the zooplankton community display considerable variations on seasonal, interannual, and regional scales (Arashkevich et al., 2002). Predictable patterns of biodiversity often occur in freshwater pelagic communities over yearly cycles in temperate regions of the globe (Bernot et al., 2004).Zooplankton is a crucial component of aquatic ecosystems because of its role in the trophic chain. It represents the channel of transmission of the energy flux from the primary producers to the top consumers (Abrantes and Goncalves, 2003). Many species of zooplankton serve as feed for fishes, moreover they could be keystone species. Copepoda is one of the most important groups of freshwater zooplankton and is one of the most numerous animal groups on the earth, occurring in all types of freshwater bodies. The phytoplankton as primary producers make it possible to operate the aquatic ecosystem in that way, they accept the solar energy and serve as feed. Our main aims were the following:• D...

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Seasonal dynamics of plankton in a mountain lake in the southern Alps (Laghetto Inferiore, Switzerland)

Cited by 10 publications

References 12 publications

Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)

Chemical and biological features of a high altitude lake in the southern Alps (Laghetto Inferiore, Switzerland)

Spatial and temporal patterns of benthic diatom flora in Lake Stechlin, Germany

Evaluation of Climate Change Scenarios Based on Aquatic Food Web Modelling

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