(HNF) , autotrophiC nanoflagellates, clhated Protozoa and mlcroalgae) and autotrophic and heterotrophic Because of difficulties related to sampling methods, activIties III a moderately aCid and humiC lake III central fixatIOn and taxonomic IdentificatIOn (Gates, 1984), It France the Lake of Vasslvlere IS only III the last decade that the Importance of the microbial loop III the transfer of energy and matter III pelagic marIne (Azam et al , 1983) and freshwater Materials and methods ecosystems (Porter, 1988, Stockner & Porter, 1988, Bermnger et ai, 1991) has been clearly demonstrat The phYSico-chemical charactenstIcs of the lake of ed The microbial loop IS a part of a larger microbial Vasslvlere (Central maSSif of France) are summanzed food web Illcludlllg both autotrophiC and heterotroph III Table 1 It IS a brown-colored humiC lake moderately IC pro-and eukaryotIc umcellular orgamsms (Sherr & aCidiC (pH values ranged between 5 1 and 7 5) A total Sherr, 1988, Weisse, 1991), which can be of paramount of 28 samples were collected from the end of Apnl to Importance III the recychng of orgamc matter (Fenchel, the middle of October at several depths (1, 5, 10 and 1987) More precisely, recent studies have suggest 15 m) III the deepest area of the lake (20 m) Samples ed that Protozoa are Illvolved III the microbial loop were taken With a Van Dorn bottle and pre-filtered onto III predatIOn and control of bactenal and autotroph a 160 p,m pore size filter, except those which were used

Klappentext

This volume contains the proceedings of the Second International Conference on Limnology and Oceanography held in Evian in May 1993. There were about 200 participants, with 64 communications and 53 posters; 42 manuscripts were selected by the Scientific Committee to provide the material for this book, which successfully shows that the different scientific communities are able to compare their individual approaches and develop new methods in common, paving the way for future and useful cooperation.

Inhalt
Invited Lectures.- A commentary on current approaches in the aquatic sciences.- Spatial heterogeneity as a multiscale characteristic of zooplankton community.- One: Invertebrates.- Genetic structure of natural populations of Nitrobacter in an aquatic environment.- Diel changes in the alkaline phosphatase activity of bacteria and phytoplankton in the hyper- eutrophic Villerest reservoir (Roanne, France).- Vertical and seasonal variations of inorganic carbon allocation into macromolecules by phytoplankton population in a brown-colored and a clear-water lake.- The microbial loop in a humic lake: seasonal and vertical variations in the structure of the different communities.- Diel changes in the biochemical composition of the particulate matter coupled with several parameters in the hypereutrophic Villerest reservoir (Roanne, France).- Spatio-temporal distribution of the microphytobenthic biomass in intertidal flats of Tagus Estuary (Portugal).- Heterogeneity of periphyton in French Mediterranean rivers.- Assessment of the bio-indicator capacity of aquatic macrophytes using multivariate analysis.- Time and spatial dynamics of Mediterranean lagoon macrobenthos during an exceptionally prolonged interruption of freshwater inputs.- A comparative study of the zoobenthos of eight land-water interfaces (Lake of Geneva).- The macroinvertebrate communities of streams draining a small granitic catchment exposed to acidic precipitations (Vosges Mountains, northeastern France).- Spatial distribution and temporal variability of some aquatic insects in the Franco-Geneva river, Allondon.- Use and partition of space and resources by two coexisting Rhyacophila species (Trichoptera) in a high mountain stream.- Diel patterns of feeding and vertical migration in daphnids and diaptomids duringthe clear water phase in Lake Geneva (France).- Modification of migratory behavior of planktonic Crustacea in the presence of a bloom of Microcystis aeruginosa (Cyanobacteria).- Spatial and temporal distribution of the zoobenthos community in a woodland pond (Switzer-land).- Spatial patterns of planktonic microcrustaceans in a small shallow lake.- Space and time distribution of zooplankton in a Mediterranean lagoon (Etang de Berre).- Feeding behavior and migrations in a natural population of the copepod Acartia tonsa.- Two: Vertebrates.- Habitat variability and space utilization by the amphibian communities of the French Upper-Rhône floodplain.- Heterogeneity and typology of fish habitat in the main stream of a Breton coastal river (Elorn-Finistère, France).- Analysis of spatial and temporal organization in a salmonid brook in relation to physical factors and macrophytic vegetation.- Reproduction, condition and food of adult arctic charr (Salvelinus alpinus, L.) in Lake Pavin (Massif Central, France).- Sand smelt (Atherina boyeri) migration within the water system of the Camargue, southern France.- Spatial pattern of size distribution of four fish species on Réunion coral reef flats.- Microhabitat requirements for settlement of juveniles sparid fishes on Mediterranean rocky shores.- Spatial and temporal separation of littoral zone fishes of Lake Geneva (Switzerland-France).- Effects of vertical prey distribution on the food-searching behavior of Danube bleak Chalcal-burnus chalcoides mento.- Temporal distribution of perch (Perca fluviatilis L.) in a lake-reservoir (Moselle, France): analysis of catches with vertical gill nets.- Impact of Caulerpa taxifola colonization on the littoral ichthyofauna of North-Western Mediterranean sea: preliminary results.-Ichthyogeographic regions and watershed size in the French river Rhône network.- Three: Methodology.- In situ observation of suspended solid aggregates in rivers.- Multi-scale heterogeneity in a macrobenthic epifauna community.- Examination through a Principal Component Analysis of the phosphorus exchanges between sediments and water in trophically different reservoirs.- 31P-NMR study of natural phytoplankton samples.- Mass-marking of bone tissue of Coregonus lavaretus L. and its potential application to moni-toring the spatio-temporal distribution of larvae, fry and juveniles of lacustrine fishes.- A survey of the spawning of perch (Perca fluviatilis), pike (Esox lucius), and roach (Rutilus rutilus), using artificial spawning substrates in lakes.- An acoustic telemetry study of seabream (Spams aurata L.): first results on activity rhythm, effects of environmental variables and space utilization.- Using multivariate analyses for separating spatial and temporal effects within species-environment relationships.- Contribution of mathematical modeling to lake ecosystem understanding: Lake Bourget (Savoy, France).