Interactions between detritivores and microfungi during the leaf detritus decomposition in a volcanic lake (Lake Vico – central Italy)

Hydrobiologia - Tập 439 - Trang 49-60 - 2000
L. Sabetta1, M. L. Costantini1, O. Maggi2, A. M. Persiani2, L. Rossi1
1Dept. of Genetics and Molecular Biology -Ecology Area-, University of Rome ‘La Sapienza’, Rome, Italy
2Dip. Biologia vegetale, University of Rome ‘La Sapienza’, Rome, Italy

Tóm tắt

The role of biota in the mass loss of Phragmites australis (Cav.) Trin. ex Steud was studied in the littoral belt of a central Italy volcanic lake. The research focussed on the feeding interactions between detritivores and decomposing fungi as drivers of the leaf litter decomposition. The litterbag technique was used to assess the leaf mass loss, the number of colonizing fungi and the patterns of leaf colonization by detritivores during 40 days of submersion in 16 sampling sites. Cores of bottom sediment were collected to estimate the organic content and ergosterol concentration as measure of fungal mass. The rate of leaf mass loss showed significant variability among the sampling sites and was non-linearly related to the quantity of organic depositions onto the lake bottom, peaking at about 40% of the dry matter. The rate was also positively correlated with the density of detritivore mass relative to the leaf unit mass, which increased with time. On the 20th day of litterbag immersion, when 40% of the initial leaf litter remained, we observed the best accordance between the two measures as well as the lowest difference in the detritivore mass density among sampling sites. In the absence of animals, the decomposition rate was positively related to the number of fungi on the decaying litter. The feeding activity of detritivores changed both the species richness and composition of the fungal community on the litter. The substrate reduction due to intense animal feeding appeared to limit the ability of fungi to regrow after grazing. As a result, an inverse relationship between the number of fungi and the decomposition rate was observed.

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Tài liệu tham khảo

Anderson, P., C. M. Davidson, D. Littlejohn & A. M. Ure, 1994. Extraction of ergosterol from peaty soil and determination by high performance liquid chromatography. Talanta 41: 711–720.

Arsuffi, T. L. & K. Suberkropp, 1989. Selective feeding by shredders on leaf-colonizing stream fungi: comparison of macroinvertebrate taxa. Oecologia 79: 30–37.

Baldy, V., M. O. Gessner & E. Chauvet, 1995. Bacteria, fungi and the breakdown of leaf litter in a large river. Oikos 74: 93–102.

Barbanti, L. 1969. Lago di Vico: rilevamento batimetrico e note geomorfologiche. Mem. Ist. ital. Idrobiol. 25: 117–139.

Barbanti, L., G. Bonomi, A. Carollo, G. Chiaudani, I. Ferrari, M. Gerletti, A. M. Nocentini, D. Ruggiu & L. Tonolli, 1971. Limnologia ed ecologia dei laghi di Bolsena, Bracciano, Trasimeno e Vico: situazione attuale e prevedibili conseguenze derivanti da una loro utilizzazione multipla. Ist. ital. Idrobiol., Verbania Pallanza.

Bärlocher, F., 1982. The contribution of fungal enzymes to the digestion of leaves by Gammarus fossarum Koch (Amphipoda). Oecologia 52: 1–4.

Bärlocher, F., 1985. The role of fungi in the nutrition of stream invertebrates. Bot. J. linn. Soc. 91: 83–94.

Bärlocher, F. & B. Kendrick, 1980. The role of aquatic hyphomycetes in trophic structure of stream. In Wicklow D. T. & G. C. Carrol (eds), The Fungal Community, its Organisation and Role in the Ecosystem. Marcel Dekker Inc. New York.

Bazzanti, M., M. Seminara & C. Tamorri, 1994. Depth distribution and relationships to the trophic state of sublittoral and profundal macrobenthos in Lake Vico (Central Italy). Limnologica 24: 13–21.

Beiser, M. C., S. Testa III & N. G. Aumen, 1991. Macroinvertebrate trophic composition and processing of four leaf species in a Mississippi stream. J. Freshwat. Ecol. 6: 23–33.

Benfield, E. F. & J. R. Webster, 1985. Shredders abundance and leaf breakdown in an Appalachian Mountain stream. Freshwat. Biol. 15: 113–120.

Carollo, A., L. Barbanti, M. Gerletti, G. Chiaudani, I. Ferrari, A. M. Nocentini, G. Bonomi, D. Ruggiu & L. Tonolli, 1974. Indagini imnologiche sui laghi di Bolsena, Bracciano, Vico e Trasimeno. Quaderni IRSA, CNR, n.17: 16–20.

Carpenter, S. R., 1982. Comparisons of equations for decay of leaf litter in tree-hole ecosystems. Oikos 39: 17–22.

Carter, J. C. H., W. D. Taylor & C. Tudorancea, 1995. A horizontal gradient in zooplankton community structure, and its implications for the relationships among mesozooplancton, microzooplancton and phytoplankton. Arch. Hydrobiol. 133: 197–222.

Caswell, H., 1978. Predator-mediated coexistence: a nonequilibrium model. Am. Nat. 112: 127–154.

Chauvet, E., N. Giani & M. O. Gessner, 1993. Breakdown and Invertebrate colonization of leaf litter in two constrasting stream: significance of oligochaetes in a large river. J. Fish. aquat. Sci. 50: 488–495.

Chergui, H. & E. Pattee, 1993. Fungal and invertebrate colonization of Salix fresh and dry leaves in a Moroccan river system. Arch. Hydrobiol. 127: 57–72.

Cummins, K.W, 1974. Structure and function of stream ecosystems. BioScience 24: 631–641.

Cummins, K. W. & M. J. Klug, 1979. Feeding ecology of stream invertebrates. Annu. Rev. Ecol. Syst. 10: 147–172.

Cummins, K. W., M.A. Wilzbach, D. M. Gates, J. B. Perry & W. B. Talliaferro, 1989. Shredders and riparian vegetation. BioScience 39(1): 24–30.

Dyer, M., 1994. The water quality at Lago di Vico during 1992–93. Sci. Tot. Envir. 171: 77–83.

Fabre E. & E. Chauvet, 1998. Leaf breakdown along an altitudinal stream gradient. Arch. Hydrobiol. 141: 167–179.

Fazi, S. & L. Rossi, 1996. Decomposition of leaf litter in saltmarsh ecosystem: weight loss rate vs. community metabolism. S.It.E. Atti 17: 435–438.

Franzoi, P., F. Scialanca & G. Castaldelli, 1997. Lago di Vico (Italia Centrale): analisi delle principali variabili fisiche e chimiche delle acque in relazione all'evoluzione trofica. S.It.E. Atti 18: 159–160.

Gessner, M. O., M. A. Bauchrowitz & Escautier, M. 1991. Extraction and quantification of ergosterol as a measure of fungal biomass in leaf litter. Microbiol. Ecol. 22: 285–291.

Gessner, M. O. & E. Chauvet, 1993. Ergosterol-to-biomass conversion factors for aquatic hyphomycetes. Appl. Envir. Microbiol. 59: 502–507.

Gessner, M. O. & E. Chauvet, 1994. Importance of stream microfungi in controlling breakdown rates of leaf litter. Ecology 75: 1807–1817.

Gessner, M. O., B. Schieferstein, U. Müller, S. Barkmann & U. A. Lenfers, 1996. A partial budget of primary organic carbon flows in the littoral zone of a hardwater lake. Aquat. Bot. 55: 93–105.

Gessner, M. O., 2000. Breakdown and nutrient dynamics of submerged Phragmites shoots in the littoral zone of a temperate hardwater lake. Aquat. Bot. 66: 9–20.

Godfrey, B. E. S., 1983. Growth of two terrestrial microfungi on submerged alder leaves. Trans. Br. Mycol. Soc. 82: 418–421.

Graça, M. A. S., 1992. Starvation and food selection by stream detritivores. Ciênc. Biol. Ecol. Syst. 12: 27–35.

Graça, M. A. S., 1993. Patterns and processes in detritus-based stream systems. Limnologica 23: 107–114.

Hanlon, R. D. G. & J.M. Anderson, 1980. Influence of macroarthropod feeding activities on microflora in decomposing oak leaves. Soil. Biol. Biochem. 12: 255–261.

Iqbal, S. H. & J. Webster, 1973. Aquatic hyphomycete spora of the River Exe and its tributaries. Trans. Br.Mycol. Soc. 61: 331–346.

Kaushik, N. B. & H. B. N. Hynes, 1968. Experimental study on the role of autumn-shed leaves in aquatic environments. J. Ecol. 56: 229–243.

Kuehen K. A. & K. Suberkropp, 1998. Decomposition of standing litter of the freshwater emergent macrophyte Juncus effusus. Freshwat. Biol. 40: 717–727.

Lousier, J. D. & D. Parchinson, 1976. Litter decomposition in a cool temperate deciduous forest. Can. J. Bot. 54: 419–436.

Lubchenco, J., 1978. Plant species diversity in a marine intertidal community: importance of herbivore food preference and algal competitive abilities. Am. Nat. 112: 23–39.

McArthur, J. V. & J. R. Barnes, 1988. Community dynamics of leaf litter breakdown in a Utah alpine stream. J. n. am. Benthol. Soc. 7: 37–43.

Newell, S. Y., T. L. Arsuffi & R. D. Fallon, 1988. Fundamental procedures for determining ergosterol content of decaying plant material by liquid chromatography Appl. envir. Microbiol. 54: 1876–1879.

Noy-Meir, I., 1995. Interactive effects of fire and grazing on structure and diversity of Mediterranean grasslands. J. Veg. Science 6: 701–710.

Oertli B. & J. B. Lachavanne, 1995. The effect of shoot on colonization of an emergent macrophyte (Typha latifolia) by macroinvertebrates. Freshwat. Biol. 34: 421–431.

Park, D., 1972. Method of detecting fungi in organic detritus in water. Trans. Br. Mycol. Soc. 58: 281–290.

Park, D., 1980. A two year study of numbers of cellulolytic Pythium in river water. Trans. Br. Mycol. Soc. 74: 253–258.

Petersen, R. C. & K. W. Cummins, 1974. Leaf processing in a woodland stream. Freshwat. Biol. 4: 343–368.

Picciafuoco, L. & L. Rossi, 1985. Biological interactions in detritus processing in freshwater. S.It.E. Atti 5: 877–881.

Proulx, M. & A. Mazumder, 1998. Reversal of grazing impact on plant species richness in nutriet-poor vs. nutrient-rich ecosystems. Ecology 79: 2581–2592.

Quinn, G. P., P. S. Lake & E. S. G. Schreiber, 1998. A comparative study of colonization by benthos in a lake and its outflowing stream. Freshwat. Biol. 39: 623–635.

Rosenberg, D.M. & V. H. Resh, 1982. The use of artificial substrate in the study of freshwater benthic macroinvertebrate. In Cairns, J.Jr (ed.), Artificial Substrates. Ann Arbor Science Publishers, Ann Arbor, MI.: 175–236.

Rossi, L. & A. E. Fano, 1979. Role of fungi in the trophic niche of the congeneric detritivorous Asellus aquaticus and A. coxalis (Isopoda). Oikos 32: 380–385.

Rossi, L., A. E. Fano, A. Basset, C. Fanelli & A. A. Fabbri, 1983. An experimental study of a microfungal community on plant detritus in a Mediterranean woodland stream. Mycologia 75: 887–896.

Rossi, L., 1985. Interactions between invertebrates and microfungi in frehwater ecosistems. Oikos 44: 175–184.

Rossi, L. & M. L. Costantini, 2000. Mapping the intra-habitat variation of leaf mass loss in a brackish Mediterranean lake. Marine Ecology Progress Series. 203: 145–159.

Rounick, J. S. & M. J. Winterbourn, 1983. Leaf processing in two contrasting beech forest streams: effect of physical and biotic factors on litter breakdown. Arch. Hydrobiol. 96: 448–474.

Saunders, G. W., 1976. Decomposition in freshwater. In Anderson, J. M. & A. Macfayden (eds), The Role of Terrestrial and Aquatic Organism in Decomposition Processes: Anderson, J. M. and Macfadyen, A. pp. 341–374.

Short, R. A. & J. V. Ward, 1980. Leaf litter processing in a regulated Rochy Mountain stream. Can. J. Fish. aquat. Sci. 37: 123–127.

Short, R. A., S. P. Canton & J. W. Ward, 1980. Detrital processing and associated macroinvertebrates on a Colorado mountain stream. Ecology 61: 727–732.

Sinsabaugh R. L. & S. Findlay, 1995. Microbial production, enzyme activity, and carbon turnover in surface sediments of the Hudson River estuary. Microbiol. Ecol. 30: 127–141.

Suberkropp, K. & M. J. Klug, 1976. Fungi and bacteria associated with leaves during processing in a woodland stream. Ecology 57: 707–719.

Suberkropp, K., T. L. Arsuffi & J. P. Anderson, 1983. Comparison of degradative ability, enzymatic activity and palatability of aquatic hyphomycetes grown on leaf litter Appl. envir. Microbiol. 46: 237–244.

Suberkropp, K., 1992. Interactions with invertebrates. In Bärlocher, F. (ed.), The Ecology of Aquatic Hyphomycetes. Springer-Verlag, Heidelberg & New York: 118–134.

Tansley, A. G. & R. S Adamson, 1925. Studies of the vegetation of the English chalk. III. The chalk grasslands of the Hampshire-Sussex border. J. Ecol. 13: 177–223.

Wardle, D. A., K. I. Bonner & K. S. Nicholson, 1997. Biodiversity and plant litter: experimental evidence which does not support the view that enhanced species richness improves ecosystem function. Oikos 79: 247–258.

Wetzel, R. G., 1983. Limnology, 2nd edn. Saunders College Publishing, Philadelphia, PA: 519–590.

Wetzel, R. G., 1990. Land-water interfaces: metabolic and limnological regulators. Verh. int. Ver. Limnol. 24: 6–24.

Willoughby, L. G., 1974. Decomposition of litter in fresh water. In: Dickinson, C. D. & G. J. F. Pugh (eds), Biology of Plant Litter Decomposition. London. Vol. 2, pp. 659–682.

Yodzis, P., 1978. Competition for Space and Structure of Ecological Communities. Lecture Notes in Biomathematics, No. 25. Springer /Berlin/Heidelberg/New York.

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Hydrobiologia

Tập 439

49-60

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