Annales de Limnologie - International Journal of Limnology

An international journal of basic and applied freshwater research

Editor-in-Chief: Pascal Laffaille
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ISSN: 0003-4088 - eISSN: 2100-000X

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  • Spatial heterogeneity and seasonal succession of phytoplankton functional groups along the vertical gradient in a mesotrophic reservoir

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    This study based on analysis from vertical profiles of phytoplankton FGs (both on a morphology-based approach and according to the functional groups), their relative biomass, physical and chemical parameters, through monthly samplings over a two years period, at three stations located along the longitudinal axis in the monomictic, mesotrophic Mediterranean reservoir. Nutrient dynamics, temperature and light availability were mainly driven by the water circulation patterns, governing the phytoplankton morphological variability (C→S→R) in İkizcetepeler reservoir. Nutrient availability and temperature constituted the main environmental constraints influencing phytoplankton dynamics, while zmix/zeu ratio played a secondary role. A similar conclusion for mesotrophic lakes was achieved by Naselli-Flores (2000) by studying 21 Sicilian man-made lakes. Despite the variations in zmix/zeu ratio as a result of stratification vs. mixing events and water withdrawal, C-strategists were typical representatives of phytoplankton assemblage. Groups Y, P, B, J, F, Lo and Tc showed heterogeneous distribution along the water column and vertical heterogeneity of phytoplankton was affected by nutrients (especially DIN values), temperature and zmix/zeu values which were mainly driven by the water circulation pattern. The results show that phytoplankton morphological spectrum throughout the entire water column, contributes useful information to assess the influence of mixing and trophic state on phytoplankton dynamics in mesotrophic reservoirs.

    Similar studies about phytoplankton structure along the vertical gradient at seasonal time scales are not so detailed, and, to our knowledge, vertical distribution of phytoplankton functional groups was not investigated in Mediterranean reservoirs and only a short term study (Becker et al., 2009b) and a long term one (Crossetti and Bicudo, 2008) were performed in tropical Brazilian reservoirs. Therefore, our results provide evidence on vertical heterogeneous distribution of phytoplankton functional groups in mesotrophic Mediterranean reservoir, allowing for a deeper understanding of the role of different groups in such systems.

    Ann. Limnol. - Int. J. Lim., 53 (2017) 129-141
    Published online: 22 February 2017
    DOI: https://doi.org/10.1051/limn/2016040
  • Non-biting midges (Diptera: Chironomidae) research in South America: subsidizing biogeographic hypotheses

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    Here it is presented a contribution to data on Chironomidae (Insecta: Diptera) collected in South America. In total, 3196 representatives of six subfamilies were collected. Sixty-one genera have been identified, containing at least 211 species. The present study provides unprecedented information for some of the most neglected areas in terms of chironomid studies in South America.

    Ann. Limnol. - Int. J. Lim., 53 (2017) 111-128
    Published online: 31 January 2017
    DOI: https://doi.org/10.1051/limn/2016039
  • Influence of environmental factors on cyanobacterial biomass and microcystin concentration in the Dau Tieng Reservoir, a tropical eutrophic water body in Vietnam

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    The dynamics of cyanobacteria and microcystins (MCs) production were investigated in a drinking water reservoir. The biomass of Chroococcales and amongst them Microcystis aeruginosa and the total phosphorus governed the MCs levels, but also temperature to a lesser extent. The manuscript provides information about toxic cyanobacteria in tropical freshwater.

    Ann. Limnol. - Int. J. Lim., 53 (2017) 89-100
    Published online: 25 January 2017
    DOI: https://doi.org/10.1051/limn/2016038
  • Significance of pelagic and benthic metabolism for the carbon budget of a shallow lake

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    Pelagic and benthic primary production and respiration were measured in a shallow, eutrophic lake to examine the role of the pelagic zone and the sediments in the overall carbon budget of the lake. The pelagic zone of the lake was net autotrophic. When the sediment primary production and respiration were taken into account both processes were balanced.

    Ann. Limnol. - Int. J. Lim., 53 (2017) 101-110
    Published online: 25 January 2017
    DOI: https://doi.org/10.1051/limn/2016035
  • Tapajobaetis, a remarkable new genus of Baetidae with spatulate claws (Ephemeroptera)

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    Ephemeroptera (Insecta) is a very common and abundant group in freshwater systems. Baetidae is the most diverse family of mayflies in terms of species. During a field trip to a poorly sampled area in the state of Para, Brazilian Amazon, a remarkable new genus of Ephemeroptera was collected. The objective of this work is to describe that new genus and new species.

    Ann. Limnol. - Int. J. Lim., 53 (2017) 79-88
    Published online: 20 January 2017
    DOI: https://doi.org/10.1051/limn/2016036