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  • 1
    Call number: M 16.90275
    Description / Table of Contents: Preface -- Contents -- Contributors -- Part I: Limnology, History and Comparative Legends -- 1: Pavin, the Birthplace of French Limnology (1770-2012), and Its Degassing Controversy (1986-2016) -- 1.1 Introduction -- 1.2 Analysis of Pavin Actors, History and Perception Through an Interdisciplinary and Intercomparative Approach -- 1.3 Pavin, a Typical Maar-Lake Above any Contamination Source -- 1.3.1 Pavin General Features -- 1.3.2 Pavin Compared to Other Lakes of the Cézallier Lake District -- 1.3.3 Pavin Compared to Other European Maar-Lakes -- 1.3.3.1 Eifel Lakes
    Description / Table of Contents: 1.3.3.2 Italian Lakes -- 1.4 Pavin Scientific Exploration (1770-1985) -- 1.4.1 Chevalier's Expedition (1770) -- 1.4.2 Lecoq, the Great Auvergne Naturalist, Normalizes Pavin… with Fishes (1847-1871) -- 1.4.3 The First Golden Age of Science at Pavin: Berthoule, Delebecque, Martel, Bruyant (1880-1914) -- 1.4.3.1 Clermont Botanists and Zoologists Establish the Limnological Station at Besse -- 1.4.3.2 André Delebecque at Pavin (1892) -- 1.4.3.3 Edouard-Alfred Martel at Creux de Soucy (1892) -- 1.4.4 Pavin Meromixis Discovery by Olivier and Pelletier (1950-1960s)
    Description / Table of Contents: 1.5 Pavin Acquires a Status of International Field Laboratory (1965-2000) -- 1.5.1 International Projects Select Pavin as a Pristine Lake (1965-1975) -- 1.5.2 Pavin, a Laboratory for Innovative Lake Research (1965-1986) -- 1.6 Maar Lakes Degassing Evidence in Cameroun and Italy -- 1.6.1 Nyos (21 August 1986) and Monoun (15 August 1984) Degassing Events and Their Effects on Populations -- 1.6.2 Ancient Degassing Events in Italian Maar-Lakes, Albano and Monticchio -- 1.6.2.1 The Albano Catastrophic Degassing and Spillover Event in Latium (398 BC)
    Description / Table of Contents: 1.6.2.2 Monticchio Lakes (Southern Italy) and Their Pioneer Degassing Studies, 1777-1838 -- 1.7 Sensory Grid of Degassing in Maar-Lakes -- 1.8 Pavin Degassing Controversy (1986-2016) -- 1.9 Conclusions -- References -- 2: Pavin, A Rich but Fragmented History (200 AD-2016) -- 2.1 Introduction -- 2.2 Finding Pavin Puzzle Pieces -- 2.3 Pavin's History Highlights -- 2.3.1 Antiquity: A Pompeian Millstone Retrieved from Pavin Waters in 1909 -- 2.3.2 Early Antique and Medieval Worship Near Pavin, on the Vassivière Mountain
    Description / Table of Contents: 2.3.3 Lacus pavens Terrifies the Whole Region Throughout the Sixteenth Century -- 2.3.3.1 The Terrible Explosion Witnessed at Vassivière by Besse People (28 August 1551 Pavin Event) -- 2.3.3.2 A Hazardous Abyss, Generating Storm, Thunder and Hail, Presented to Charles IX (1566) -- 2.3.3.3 Pavin Painted on the First Realistic Landscape Picture in France (1571-1579) -- 2.3.3.4 Pavin Marvelous Response to a Thrown Stone in Belleforest's Cosmographia Universalis (1575) -- 2.3.3.5 Lacus pavens, the Terrifying Lake, Is the Original Pavin Name (Banc 1605)
    Description / Table of Contents: 2.3.4 The Admirable and Terrifying Pavens Gets Famous During the Seventeenth Century
    Type of Medium: Monograph available for loan
    Pages: XV, 421 S.
    ISBN: 9783319399607
    Classification:
    Historical Geology
    Language: English
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  • 2
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. The seasonal and vertical distribution of the abundance of virus-like particles (VLPs), together with the abundances of other microbial organisms (bacteria, unpigmented and pigmented nanoflagellates and ciliates), were determined in an oligomesotrophic lake (Pavin, France) and in a eutrophic lake (Aydat, France) between March and December 2000.2. The abundance of the viral plankton and those of other microbial taxa were significantly higher in the more productive system. The same was for the virus-to-bacteria quotient (VBQ), which averaged seven in Lake Pavin and nine in Lake Aydat.3. The abundance of viruses increased during the period of thermal stratification in both lakes, with the highest values being recorded at the end of summer/early autumn in the epi- and the metalimnion. The seasonal pattern of abundance of viruses in both lakes in the surface layer was similar, indicating that the dynamics of viruses may be controlled by environmental factors such as light conditions.4. There was no correlation between the abundance of viruses and protists. We found correlations between viruses and heterotrophic bacteria in the whole water column in Lake Pavin, but only in the dark bottom waters in Lake Aydat.5. Overall, the empirical findings in this study lead us to speculate that the weaker correlation between bacteria and viruses in Lake Aydat than in Lake Pavin, as well as the higher VBQ in the former, is a consequence of the increasing relative abundance of non-bacteriophage VLPs along the trophic gradient of aquatic systems.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. We performed three, 1-week in situ experiments in March-April (expt 1), May (expt 2) and August (expt 3) 2003 in order to assess protozoan and virus-induced mortality of heterotrophic bacteria in a French lake. Viral and bacterial abundances were obtained using flow cytometry (FCM) while protozoa were counted using epifluorescence microscopy (EFM).2. A dilution approach, applied to pretreated grazer-free samples, allowed us to estimate that viral lysis could be responsible for 60% (expt 1), 35% (expt 2) and 52% (expt 3) of daily heterotrophic bacterial mortality. Flagellate (both mixotrophic and heterotrophic) grazing in untreated samples, was responsible for 56% (expt 1), 63% (expt 2) and 18% (expt 3) of daily heterotrophic bacteria removal.3. These results therefore suggest that both viral lysis and flagellate grazing had a strong impact on bacterial mortality, and this impact varied seasonally.4. From parallel transmission electron microscopy (TEM) analysis, we found that the burst size (i.e. the number of viruses potentially released per lysed cell) ranged from nine to 25 (expt 1), 10 to 35 (expt 2) and eight to 25 (expt 3). The percentage of infected heterotrophic bacteria was 5.7% (expt 1), 3.4% (expt 2) and 5.7% (expt 3) so that the calculated percentage of bacterial mortality induced by viruses was 6.3% (expt 1), 3.7% (expt 2) and 6.3% (expt 3).5. It is clear that the dilution-FCM and TEM methods yielded different estimates of viral impact, although both methods revealed an increased impact of viruses during summer.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We conducted a transplant experiment to elucidate the effects of different levels of grazing pressure, nutrient availability, especially phosphorus, and the impact of viruses on the changes in the structure of bacterioplankton assemblage in a meso-eutrophic reservoir. A sample taken from the nutrient-rich inflow part of the reservoir was size-fractionated and incubated in dialysis bags in both inflow and dam area. The structure of bacterial assemblage was examined by fluorescence in situ hybridization using oligonucleotide probes with different levels of specificity. In terms of the relative proportions of different bacterial groups, we found very few significant changes in the bacterioplankton composition after transplanting the treatments to the nutrient-poor dam area. However, we observed marked shifts in morphology and biomass towards the development of filaments, flocs and “vibrio-like” morphotypes of selected probe-defined groups of bacteria induced by increased grazing pressure. Despite the very high abundances of viruses in all the treatments, their effects on bacterioplankton were rather negligible.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Polar biology 18 (1997), S. 70-75 
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nematodes from the bottom section of first-year ice sampled every 4 days during April/May 1992 at two adjacent sites of an ice field station in Resolute Passage have been identified as members of the Monhysteroidea: Theristus melnikovi Tchesunov, 1986; Cryonema tenue Tchesunov and Riemann, 1995; and three unknown monhysterids that are similar to Cryonema. The maximum population density of nematodes was 23 810 m−2. None of the ice nematodes has ever been reported from benthic samples and their occurrence in ephemeral sea ice is the subject of hypotheses. Since a drastic change of the community structure was noted to take place within a few days, it is assumed that the majority of ice-nematode species do not represent an autochthonous faunal element in the examined habitat and that the main site for their reproduction is elsewhere. The nematode community found near the undersurface of ephemeral ice is apparently influenced by particular import and export processes that are unknown as yet.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Aquatic sciences 57 (1995), S. 91-105 
    ISSN: 1420-9055
    Keywords: Lake ; autotrophic picoplankton ; microzooplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spatial and seasonal fluctuations in autotrophic picoplankton (APP) abundance in a eutrophic, dimictic lake (Lake Aydat, France) were measured concurrently with a variety of environmental variables. Cell number ranged from 0.03 to 2.36×106 cells·ml−1 (highest concentrations were 〉5-fold higher than in oligotrophic lakes) and averaged 24 ± 7% of total picoplankton abundance (APP + heterotrophic bacteria). APP abundance (1) peaked in spring simultaneously with heterotrophic flagellate and ciliate densities, (2) decreased during the nitrogen-limited and summer stratification period, and (3) increased with fall turnover. In summer-autumn, the contribution of single-cell eukaryotic (up to 66%) and colonial prokaryotic (18%) forms to total abundance peaked in the bottom waters. Multivariate regression analyses suggest that 〉40% variance in APP number changes may be explained by ciliate abundance (at 0–4 m depth-range), heterotrophic flagellate number and oxygen concentration (5–9 m), and ciliate carbon biomass (10–14 m). The model accounting for changes in heterotrophic bacterial abundance (5–9 m) indicates chlorophylla concentration (r 2=58%) and ciliate abundance (r 2=34%) as dominant covariates. The data presented here suggest that micrograzers control APP abundance in Lake Aydat.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1420-9055
    Keywords: Lake ; ciliates ; mixotrophic species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The abundance and the biomass of bacterial, phytoplanktonic, and ciliate communities were estimated at different depths during the spring planktonic development in an oligo-mesotrophic lake (the Pavin lake). The bacterial population, which consists mainly of free bacteria (94% of the total bacterial abundance), displays only low cell densities (0.6 to 7 × 105 cells · ml−1) and represents low biomass values (0.9 to 11.5 µgC·l−1) The bacteria represent from 0.9 to 23.8% (M = 9.7%) of the “microplanktonic biomass” (with the exclusion of heterotrophic nanoflagellates, i.e. bacteria + phytoplankton + ciliates, size range 0.2–160 µm). The abundance of the phytoplankton varies between 0.5 and 1.8 × 106 cells·l−1, and the biomass values between 12 and 118 µC·l−1. The phytoplankton population constitutes the largest part of the microplanktonic biomass (51.9 to 96.6%, M = 80.6%), and the diatomMelosira italica subsp.subarctica is the largely dominant species of this community. The population of ciliates, essentiallyOligotrichida andScuticociliatida, displays densities between 1.3 and 38.3 × 103 cells·l−1 (M = 6.7 × 103 cells·l−1), and biomass values vary from 0.10 to 16.30 µgC·l−1 (M = 6.01 µgC·l−1). The ciliates constitute thus from 0.1 to 26.4% (M = 9.8%) of the microplanktonic biomass. Whereas the oligotrichs are best represented in the euphotic zone, the small-sized scuticociliates dominate in the hypolimnion. Besides, species having symbionts and considered to be mixotrophic (Strobilidium gyrans, Strombidium viride, Stokesia vernalis) develop preferentially in the epilimnion and constitute more than 50% of the total ciliate biomass.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-5117
    Keywords: tropical lakes ; artificial lakes ; circadian variations ; plankton ; bacteria ; algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Circadian and spatial fluctuations in bacterioplankton abundance and cell volume were examined, for the first time, in the Municipal Lake located in the down town area of Yaoundé (Capital of Cameroon, Central Africa, ca 3° 52′ N, 11° 31′ E). Bacterial cell volumes (range, 0.05 to 0.2 μm3) were consistent with those reported for other aquatic systems while bacterial densities (0.8 to 2 × 108 cells ml-1) were among the highest values reported in pelagic systems. These variables and chlorophyll a and dissolved oxygen concentrations within a single depth-zone varied from 13 to 61%, while water temperature fluctuated only from 2 to 6%. Spatial fluctuations of physical-chemical and biological variables were generally higher during the day-time than during the night-time. A significant diel variation was provided for bacterial cell volume in the surface waters where synchronized cell division was occurring during the night. The measured bacterial abundances in this study were 4 to 17 fold higher than values known from other lakes of similar trophic status, and both cell abundance and volume were not correlated with chlorophyll. We conclude that this was due to the dependence of bacterial populations to different sources of allochthonous substrates, including untreated sewage from the major influents of the lake, resuspension of benthic material, and substrate releasing from macrophytes which are prevalent in the littoral zone of the lake.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1573-5117
    Keywords: tropical lakes ; artificial lakes ; circadian variations ; plankton ; bacteria ; algae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Circadian and spatial fluctuations in bacterioplankton abundance and cell volume were examined, for the first time, in the Municipal Lake located in the down town area of Yaoundé (Capital of Cameroon, Central Africa, ca 3° 52′ N, 11° 31′ E). Bacterial cell volumes (range, 0.05 to 0.2 μm3) were consistent with those reported for other aquatic systems while bacterial densities (0.8 to 2 × 108 cells ml-1) were among the highest values reported in pelagic systems. These variables and chlorophyll a and dissolved oxygen concentrations within a single depth-zone varied from 13 to 61%, while water temperature fluctuated only from 2 to 6%. Spatial fluctuations of physical-chemical and biological variables were generally higher during the day-time than during the night-time. A significant diel variation was provided for bacterial cell volume in the surface waters where synchronized cell division was occurring during the night. The measured bacterial abundances in this study were 4 to 17 fold higher than values known from other lakes of similar trophic status, and both cell abundance and volume were not correlated with chlorophyll. We conclude that this was due to the dependence of bacterial populations to different sources of allochthonous substrates, including untreated sewage from the major influents of the lake, resuspension of benthic material, and substrate releasing from macrophytes which are prevalent in the littoral zone of the lake.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2010-03-09
    Print ISSN: 1015-1621
    Electronic ISSN: 1420-9055
    Topics: Biology
    Published by Springer
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