Abstract
Chlorophytes and cyanobacteria are among the most typical algal groups, contributing to the aesthetic appearance and quality of the epilimnetic waters of the deep (251–410 m) and large (6.5–49×109 m3) lakes located on the southern edge of the Alps (from oligo-mesotrophy to meso-eutrophy: Maggiore, Garda, Como, Iseo and Lugano). The results obtained from monthly surveys carried out in the largest of these lakes (Garda) have been reported in detail. The thermal stability of the water column and silica depletion were the main factors responsible for the decline of the great spring diatoms. The successive growth of Mougeotia sp. was favoured by its lower sinking velocity and resistance to the increasing grazing pressure. During summer, the maximum stability of the water column, with high vertical nutrient concentration gradients, determined a major algal differentiation with a typical increase, among others, of Chlorococcales at the surface and metalimnetic stratification of various Oscillatoriales. The development of oligotrophic blooms, caused by a rapid thickening at the surface of Anabaena in the eastern, sheltered basin, was also discussed in light of the trophic characterisation of Lake Garda. From autumn to spring, the decreasing light, the increasing mixing depth and nutrient availability favoured a progressive dominance of vertical homogeneous populations of Planktothrix (autumn) and colonial diatoms. The same functional groups of chlorophytes and cyanobacteria have been recognised in the studies published so far on the phytoplankton of deep southern subalpine lakes. In this respect, their morphometric and physical properties appear to constitute a sort of standardising factor, reducing the range of possible dominants. With increasing TP concentrations and biomass, filaments of Planktothrix and Planktolyngbya, along with the Chlorococcales, became important. The dominance of Mougeotia (one of the most characteristic features of these large lakes) appears restricted to a medium trophic range, whereas the distribution of the Chroococcales and other filaments ascribed to Pseudanabaena and/or Limnothrix is more irregular. The conspicuous presence of Aphanizomenon in Lake Lugano is typical and characteristic of a more productive lake. Among the Nostocales, a clear interpretation of the Anabaena blooms in lakes Garda and Iseo is complicated by the peculiar behaviour of filaments concentrating at the surface, which is apparently restricted, within the medium trophic range, to stable water columns.
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References
Allison, E. M. & A. E. Walsby, 1981. The role of potassium in the control of turgor pressure in a gas-vacuolate blue-green alga. J. exp. Bot. 32: 241–249.
Ambrosetti, W. & L. Barbanti, 1992. Physical limnology in Italy: an historical review. Mem. Ist. ital. Idrobiol. 50: 37–59.
Ambrosetti, W. & L. Barbanti, 1997. Alcune problematiche fisiche dei grandi laghi sudalpini. Documenta Ist. ital. Idrobiol. 61: 3–18.
Anagnostidis, K. & J. Komárek, 1988. Modern approach to the classification system of Cyanophytes. 3-Oscillatoriales. Arch. Hydrobiol. Suppl. 80, Algological Studies 50–53: 327–472.
APHA, AWWA & WEF., 1989. Standard methods for the examination of water and wastewater. 17th edn American Public Health Association, Washington.
Barbanti, L., 1974. Morfologia della conca lacustre. In Gerletti, M (ed.), Indagini sul Lago di Garda. IRSA quaderni 18, Roma: 101–115.
Barbieri, A. & M. Simona, 1997. Evoluzione trofica recente del Lago di Lugano in relazione agli interventi di risanamento. Documenta Ist. ital. Idrobiol. 61: 73–91.
Bettinetti, R., G. Morabito & A. Provini. (in press). Phytoplankton community as indicator of the recent trophic and biological evolution of the western basin of Lake Como (N. Italy). Hydrobiologia.
Bjork, S., 1979. Lake management studies and results at the Institute of Limnology in Lund. Arch. Hydrobiol. Beih. Ergebn. Limnol. 13: 31–55.
Bleiker, W. & F. Schanz, 1989. Influence of environmental factors on the phytoplankton spring bloom in Lake Zürich. Aquat. Sci. 51: 47–58.
Blomqvist, P., A. Petterson & P. Hyenstrand, 1994. Ammoniumnitrogen: a key regulatory factor causing dominance of nonnitrogen-fixing cyanobacteria in aquatic systems. Arch. Hydrobiol. 132: 141–164.
Bold, H. C. & M. J. Wynne, 1985. Introduction to the Algae. Structure and reproduction. Prentice-Hall, Englewood Cliffs, N.J.: 720 pp.
Bourrelly, P., 1972. Les Algues d'eau douce. Initiation à la Systématique, I. Les Algues Vertes. N. Boubée & Cie, Paris: 572 pp.
Büsing, N., 1998. Seasonality of phytoplankton as an indicator of trophic status of the large perialpine 'Lago di Garda'. Hydrobiologia 369/370 (Dev. Hydrobiol. 129): 153–162.
Calderoni, A., R. Mosello & R. De Bernardi, 1997. Interpretazioni problematiche di alcuni processi nella fase di oligotrofizzazione del LagoMaggiore nel decennio 1988–1997. Documenta Ist. ital. Idrobiol. 61: 33–53.
Decet, F. & N. Salmaso, 1997. Indagini preliminari sulle caratteristiche chimiche dei principali affluenti e dell'emissario del Lago di Garda. Acqua Aria 7: 91–97.
Dillon, P. J., K. H. Nicholls & G. W. Robinson, 1978. Phosphorus removal at Gravenhurst Bay, Ontario: an 8 year study on water quality changes. Int. Ver. Theor. Angew. Limnol. Verh. 20: 263–271.
Edmondson, W. T. & J. T. Lehman, 1981. The effect of changes in the nutrient income on the condition of Lake Washington. Limnol. Oceanogr. 26: 1–29.
Elser, J. J. & D. L. Frees, 1995. Microconsumer grazing and sources of limiting nutrients for phytoplankton growth: Application and complications of a nutrient-deletion/dilution-gradient technique. Limnol. Oceanogr. 40: 1–16.
Field, J. G., K. R. Clarke & R. M. Warwick, 1982. A practical strategy for analysing multispecies distribution patterns. Mar. Ecol. Prog. Ser. 8: 37–52.
Garibaldi, L., M. C. Brizzio, V. Mezzanotte, A. Varallo & R. Mosello, 1997. Evoluzione idrochimica e trofica del Lago d'Iseo. Documenta Ist. ital. Idrobiol. 61: 135–151.
Gibson, C. E. & R. V. Smith, 1982. Freshwater plankton. In Carr N. G. & B. A. Whitton (eds), The Biology of Cyanobacteria. Blackwell Scientific Publications, Oxford: 463–489.
Grant, N. G. & A. E. Walsby, 1977. The contribution of photosynthate to turgor pressure rise in the planktonic blue-green alga Anabaena flos-aquae. J. exp. Bot. 28: 409–415.
Guilizzoni, P., G. Bonomi, G. Galanti & D. Ruggiu, 1983. Relationship between sedimentary pigments and primary production: evidence from core analyses of 12 Italian lakes. Hydrobiologia 103: 103–106.
Happey-Wood, C. M., 1988. Ecology of freshwater planktonic green algae. In Sandgren, C. D. (ed.), Growth and Reproductive Strategies of Freshwater Phytoplankton. Cambridge University Press, Cambridge: 175–226.
Hutchinson, G. E., 1967. A treatise on limnology, 2. Wiley & Sons, New York: 1115 pp.
Hyenstrand, P., P. Blomqvist & A. Petterson, 1998. Factors determining cyanobacterial success in aquatic systems-a literature review. Arch. Hydrobiol. Spec. Issues Advanc. Limnol. 51: 41–62.
IRSA, 1974. Indagini sul Lago di Garda. IRSA Quaderni 18, Roma: 540 pp.
Jensen, J. P., E. Jeppesen, K. Olrik & P. Kristensen, 1994. Impact of nutrients and physical factors on the shift from cyanobacterial to chlorophyte dominance in shallow Danish lakes. Can. J. Fish. aquat. Sci. 51: 1692–1699.
Kilham, P., 1971. A hypothesis concerning silica and the freshwater plankton diatoms. Limnol. Oceanogr. 16: 10–18.
Klemer, A. R., 1976. The vertical distribution of Oscillatoria agardhii var. isothrix. Arch. Hydrobiol. 78: 343–362.
Komárek, J. & B. Fott, 1983. Chlorophyceae (Grünalgen), Ordnung: Chlorococcales. In Das Phytoplankton des Süßwassers (founded by G. Huber-Pestalozzi). Die Binnengewässer 16, 7/1. E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart: 1044 pp.
Komarková-Legnerová, J. & G. Cronberg, 1992. New and recombined filamentous Cyanophytes from lakes in South Scania, Sweden. Arch. Hydrobiol., Algol. Stud. 67: 21–31.
Komarková-Legnerová, J. & P. Eloranta, 1992. Planktic blue-green algae (Cyanophyta) from Central Finland (Jyväskylä region) with special reference to the genus Anabaena. Arch. Hydrobiol., Algol. Stud. 67: 103–133.
Kristiansen, S., T. Farbrot & L. J. Naustvoll, 2000. Production of biogenic silica by spring diatoms. Limnol. Oceanogr. 45: 472–478.
Kromkamp, J. & A. E. Walsby, 1990. A computer model of buoyancy and vertical migration in cyanobacteria. J. Plankton Res. 12: 161–183.
Laboratorio Studi Ambientali (LSA)-SPAA, 1995. Ricerche sull'evoluzione del Lago di Lugano. Aspetti limnologici. Programma quinquennale 1993–1997. Campagna 1995. Commissione internazionale per la protezione delle acque italo-svizzere (ed.): 100 pp.
Laboratorio Studi Ambientali (LSA)-SPAA, 1998. Ricerche sull'evoluzione del Lago di Lugano. Aspetti limnologici. Programma quinquennale 1993–1997. Campagne 1996–97 e rapporto quinquennale 1993–1997. Commissione internazionale per la protezione delle acque italo-svizzere (ed.): 124 pp.
Lampert, W. & U. Sommer, 1997. Limnoecology: the Ecology of Lakes and Streams. Oxford-University-Press-Incorporated, New York: 382 pp.
Lorenzen, C. J., 1967. Determination of Chlorophyll and Pheo-Pigments: spectrophotometric equations. Limnol.-Oceanogr. 12: 343–346.
Lund, J. W. G., C. Kipling, & E. D. Le Cren, 1958. The inverted microscope method of estimating algal numbers and the statistical basis of estimations by counting. Hydrobiologia 11: 143–170.
Magurran, A. E., 1988. Ecological diversity and its measurement. Croom Helm, London: 179 pp.
Marker, A. F. H., E. A. Nusch, H. Ray & B. Riemann, 1980. The measurement of photosynthetic pigments in freshwaters and standardization of methods: Conclusions and recommendations. Arch. Hydrobiol. Beih. 14: 91–106.
Mayer, J. M. T. Dokulil, M. Salbrechter, M. Berger, T. Posch, G. Pfister, A. K. T. Kirschner, B. Velimirov, A. Steitz & T. Ulbricht, 1997. Seasonal successions and trophic relations between phytoplankton, zooplankton, ciliate and bacteria in a hypertrophic shallow lake in Vienna, Austria. Hydrobiologia 342: 165–174.
Micheletti, S., F. Schanz & A. E. Walsby, 1998. The daily integral of photosynthesis by Planktothrix rubescens during summer stratification and autumnal mixing in Lake Zurich. New Phytol. 139: 233–246.
Morabito, G. & P. Panzani, 1998. Popolamenti planctonici. Indagini sul fitoplancton. In: C.N.R. Istituto italiano di Idrobiologia. Ricerche sull'evoluzione del Lago Maggiore. Aspetti limnologici. Programma quinquennale 1993–1997. Campagna 1997 e relazione finale. Commissione internazionale per la protezione delle acque italo-svizzere (ed.): 48–50.
Mosello, R., A. Calderoni & R. De Bernardi, 1997. Le indagini sulla evoluzione dei laghi profondi sudalpini svolte dal CNR Istituto italiano di Idrobiologia. Documenta Ist. ital. Idrobiol. 61: 19–32.
Mosello, R., M. C. Brizzio, L. Garibaldi, F. Buzzi, L. Colzani, E. Pizzotti & D. Mocellin, 1999. Attuali condizioni trofiche dei bacini di Como e Lecco del Lario. Acqua Aria, nov./dic.: 71–81.
OECD, 1982. Eutrophication of waters. Monitoring, assessment and control. OECD, Paris: 154 pp.
Oliver, R. L. & A. E. Walsby, 1984. Direct evidence for the role of light-mediated gas vesicle collapse in the buoyancy regulation of Anabaena flos-aquae (cyanobacteria). Limnol. Oceanogr. 29: 879–886.
Pollingher, U., 1990. Effects of latitude on phytoplankton composition and abundance in large lakes. In Tilzer, M. M. & C. Serruya (eds), Large Lakes. Ecological Structure and Function. Springer Verlag, Berlin: 368–402.
Porter, K. G., 1973. Selective grazing and differential digestion of algae by zooplankton. Nature 244: 179–180.
Ramón, G. & G. Moyá, 1984. Seasonal variations in the vertical distribution of Oscillatoria rubescens D.C. in the Gorg Blau reservoir, Spain. Verh. int. Ver. Limnol. 22: 1546–1549.
Rawson, D. S., 1956. Algal indicators of trophic lake types. Limnol. Oceanogr. 1: 18–25.
Reynolds, C. S., 1984. The Ecology of Freshwater Phytoplankton. Cambridge University Press, Cambridge: 384 pp.
Reynolds, C. S., 1996. The plant life of the pelagic. Verh. int. Ver. Limnol. 26: 97–113.
Reynolds, C. S., 1997. Vegetation processes in the pelagic: a model for ecosystem theory. Ecology Institute, Oldendorf: 371 pp.
Reynolds, C. S., 1998. What factors influence the species composition of phytoplankton in lakes of different trophic status? Hydrobiologia 369/370 (Dev. Hydrobiol. 129): 11–26.
Reynolds, C. S., 1999. Metabolic sensitivities of lacustrine ecosystems to anthropogenic forcing. Aquat. Sci. 61: 183–205.
Reynolds, C. S. & A. E. Walsby, 1975. Water-blooms. Biol. Rev. 50: 437–481.
Reynolds, C. S., J. G. Tundisi & K. Hino, 1983. Observations on a metalimnetic Lyngbya population in a stable stratified tropical lake (Lagoa Carioca, Eastern Brasil). Arch. Hydrobiol. 97: 7–17.
Richerson, P. J., P. Neale, W. Wurtsbaugh, R. Alfaro & W. Vincent, 1986. Patterns of temporal variation in Lake Titicaca: a high altitude tropical lake. I. Background, physical and chemical processes and primary production. Hydrobiologia 138: 205–220.
Rodhe, W., 1948. Environmental requirements of freshwater plankton algae. Symb. Bot. Upsaliensis 10: 1–149.
Rott, E., 1981. Some results from phytoplankton counting intercalibrations. Schweiz. Z. Hydrol. 43: 34–62.
Rott, E., 1984. Phytoplankton as biological parameter for the trophic characterization of lakes. Verh. int. Ver. Limnol. 22: 1078–1085.
Ruggiu, D., 1983. Caratteristiche e comportamento del fitoplancton nei laghi profondi sudalpini. In Ambrosetti, W., L. Barbanti, R. Mosello, A. Rolla & D. Ruggiu (eds), Mescolamento, Caratteristiche Chimiche, Fitoplancton e Situazione trofica Nei Laghi Profondi Sudalpini. C.N.R.-P.F. "Promozione della Qualità dell'Ambiente", AQ/2/20: 105–143.
Ruggiu, D. & R. Mosello, 1984. Nutrient levels and phytoplankton characteristics in the deep souther alpine lakes. Verh. int. Ver. Limnol. 22: 1106–1112.
Ruggiu, D., G. Morabito, P. Panzani & A. Pugnetti, 1997. Indagini sul fitoplancton. In: C.N.R. Istituto italiano di Idrobiologia. Ricerche sull'evoluzione del Lago Maggiore. Aspetti limnologici. Programma quinquennale 1993–1997 (Campagna, 1996). Commissione internazionale per la protezione delle acque italo-svizzere (ed.): 49–53.
Ruggiu, D., G. Morabito, P. Panzani & A. Pugnetti, 1998. Trends and relations among basic phytoplankton characteristics in the course of the long-term oligotrophication of Lake Maggiore (Italy). Hydrobiologia 369/370 (Dev. Hydrobiol. 129): 243–257.
Salmaso, N., 1996. Seasonal variation in the composition and rate of change of the phytoplankton community in a deep subalpine lake (Lake Garda, Northern Italy). An application of nonmetric multidimensional scaling and cluster analysis. Hydrobiologia 337: 49–68.
Salmaso, N. & F. Decet, 1997. Seasonal and interannual changes of chemical characteristics and phytoplankton in a mountain lake of the eastern Italian Alps (Lake Calaita, Trentino). Int. Rev. ges. Hydrobiol. 82: 15–31.
Salmaso, N. & F. Decet, 1998. Interactions of physical, chemical and biological processes affecting the seasonality of mineral composition and nutrient cycling in the water column of a deep subalpine lake (Lake Garda, Northern Italy). Arch. Hydrobiol. 142: 385–414.
Salmaso, N. & L. Naselli-Flores, 1999. Studies on the zooplankton of the deep subalpine Lake Garda. J. Limnol. 58: 66–76.
Salmaso, N., F. Cavolo & P. Cordella, 1994. —Fioriture di Anabaena e Microcystis nel Lago di Garda. Eventi rilevati e caratterizzazione dei periodi di sviluppo. Acqua Aria 1: 17–28.
Salmaso, N., F. Decet & P. Cordella, 1999. Understanding deep oligotrophic subalpine lakes for efficient management. Hydrobiologia 395/396 (Dev. Hydrobiol. 136): 253–263.
Salmaso, N., F. Decet, M. Manfrin & P. Cordella, 1997. Ricerche limnologiche sul Lago di Garda (1991–1996). Documenta Ist. ital. Idrobiol. 61: 173–199.
Saraceni, C. & D. Ruggiu, 1974. Techniques for sampling water and phytoplankton. In Vollenweider, R. A. (ed.), A Manual on Methods for Measuring Primary Production in Aquatic Environments. IBP Handbook 12, Blackwell, Oxford: 5–7.
Sommer, U., 1986. The periodicity of phytoplankton in Lake Constance (Bodensee) in comparison to other deep lakes of central Europe. Hydrobiologia 138: 1–7.
Sommer, U., 1987. Factors controlling the seasonal variation in phytoplankton species composition. A case study for a deep, nutrient rich lake. Prog. Phyc. Res. 5: 123–178.
Sommer, U., 1988. Growth and survival strategies of planktonic diatoms. In Sandgren, C. D. (ed.), Growth and Reproductive Strategies of Freshwater Phytoplankton. Cambridge University Press, Cambridge: 227–260.
Sommer, U., Z. M. Gliwicz, W. Lampert & A. Duncan, 1986. The PEG-model of seasonal succession of planktonic events in fresh waters. Arch. Hydrobiol. 106: 433–471.
Sterner, R. W., 1989. Resource competition during seasonal succession toward dominance by cyanobacteria. Ecology 70: 229–245.
Stockner, J. G. & K. S. Shortreed, 1988. Response of Anabaena and Synechococcus to manipulation of nitrogen:phosphorus ratios in a lake fertilisation experiment. Limnol. Oceanogr. 33: 1348–1361.
Symoens, J. J., E. Kusel-Fetzmann & J. P. Descy, 1988. Algal communities of continental waters. In Symoens, J. J. (ed.), Vegetation of Inland Waters. Handbook of Vegetation Science 15/1, Kluwer Academic Publishers, Dordrecht, The Netherlands: 183–221.
Talling, J. F., 1971. The underwater light climate as a controlling factor in the production ecology of freshwater phytoplankton. Mitt. int. Ver. Limnol. 19: 214–243.
Tilman, D., 1977. Resource competition between planktonic algae: an experimental and theoretical approach. Ecology 58: 338–348.
Tilman, D. & S. S. Kilham, 1976. Phosphate and silicate uptake and growth kinetics of the diatoms Asterionella formosa and Cyclotella meneghiniana in batch and semicontinuous culture. J. Phycol. 12: 375–383.
Tilzer, M. M., 1990. Specific properties of large lakes. In Tilzer, M. M. & C. Serruya (eds), Large Lakes. Ecological Structure and Function. Springer Verlag, Berlin: 39–43.
Tilzer, M. M. & C. Serruya, 1990. Large Lakes. Ecological Structure and Function. Springer Verlag, Berlin, 691 pp.
Titman, D. (Tilman) & P. Kilham, 1976. Sinking in freshwater phytoplankton: some ecological implications of cell nutrient status and physical mixing processes. Limnol. Oceanogr. 21: 409–417.
Trimbee, A. M. & E. E. Prepas, 1987. Evaluation of total phosphorus as a predictor of the relative biomass of blue-green algae with emphasis on Alberta lakes. Can. J. Fish. aquat. Sci. 44: 1337–1342.
Walsby, A. E., A. Avery & F. Schanz, 1998. The critical pressures of gas vesicles in Planktothrix rubescens in relation to the depth of winter mixing in Lake Zurich, Switzerland. J. Plankton Res. 20: 1357–1375.
Walsby, A. E., R. Kinsman, B. W. Ibelings & C. S. Reynolds, 1991. Highly buoyant colonies of the cyanobacterium Anabaena lemmermannii form persistent surface waterblooms. Arch. Hydrobiol. 121: 261–280.
Watson, S. B., E. McCauley & J. A. Downing, 1997. Patterns in phytoplankton taxonomic composition across temperate lakes of differing nutrient status. Limnol. Oceanogr. 42: 487–495.
Whittaker, R. H., 1962. Classification of natural communities. Bot. Rev. 28: 1–239.
Wüest, A., W. Aeschbach-Hertig, H. Baur, M. Hofer, R. Kipfer & M. Schurter, 1992. Density structure and tritium-helium age of deep hypolimnetic water in the northern basin of Lake Lugano. Aquat. Sci. 54: 205–217.
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Salmaso, N. Factors affecting the seasonality and distribution of cyanobacteria and chlorophytes: a case study from the large lakes south of the Alps, with special reference to Lake Garda. Hydrobiologia 438, 43–63 (2000). https://doi.org/10.1023/A:1004157828049
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DOI: https://doi.org/10.1023/A:1004157828049