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Volumn 42, Issue SUPPL. 1, 2006, Pages

Soil fauna-microbe interactions: towards a conceptual framework for research

Author keywords

Ecological theory; Ecosystem function; Evolution; Food webs; Inter species signalling; Mutualism

Indexed keywords

ANIMALIA;

EID: 33748948223     PISSN: 11645563     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.ejsobi.2006.07.007     Document Type: Article
Times cited : (26)

References (73)
  • 1
    • 0001813181 scopus 로고
    • Policy implications of the missing global carbon sink
    • Adger W.N., and Brown K. Policy implications of the missing global carbon sink. Area 27 (1995) 311-317
    • (1995) Area , vol.27 , pp. 311-317
    • Adger, W.N.1    Brown, K.2
  • 2
    • 33645234883 scopus 로고    scopus 로고
    • Slow recovery of biodiversity in sandy loam soils of Georgia after 25 years of no-tillage management
    • (in press)
    • Adl S.M., Coleman D.C., and Read F. Slow recovery of biodiversity in sandy loam soils of Georgia after 25 years of no-tillage management. Agric. Ecosyst. Environ. (2006) (in press)
    • (2006) Agric. Ecosyst. Environ.
    • Adl, S.M.1    Coleman, D.C.2    Read, F.3
  • 5
    • 0001468814 scopus 로고    scopus 로고
    • Which species? What kind of diversity? Which ecosystem function? Some problems in studies of relations between biodiversity and ecosystem function
    • Bengtsson J. Which species? What kind of diversity? Which ecosystem function? Some problems in studies of relations between biodiversity and ecosystem function. Appl. Soil Ecol. 10 (1998) 191-199
    • (1998) Appl. Soil Ecol. , vol.10 , pp. 191-199
    • Bengtsson, J.1
  • 6
    • 33845233812 scopus 로고    scopus 로고
    • J. Bengtsson, M.P. Berg, Spatiotemporal food web dynamics, in: P.C. de Ruiter, J.C. Moore, V. Wolters (Eds.), Dynamic Food Webs, Elsevier, Amsterdam.
  • 7
    • 0031943058 scopus 로고    scopus 로고
    • Dynamics and stratification of bacteria and fungi in the organic layers of a scots pine forest soil
    • [a]
    • Berg M.P., Kniese J.P., and Verhoef H.A. Dynamics and stratification of bacteria and fungi in the organic layers of a scots pine forest soil. Biol. Fertil. Soils 26 (1998) 313-322 [a]
    • (1998) Biol. Fertil. Soils , vol.26 , pp. 313-322
    • Berg, M.P.1    Kniese, J.P.2    Verhoef, H.A.3
  • 8
    • 0031945169 scopus 로고    scopus 로고
    • Dynamics and stratification of functional groups of micro- and mesoarthropods in the organic layer of a Scots pine forest
    • [b]
    • Berg M.P., Kniese J.P., Bedaux J.J.M., and Verhoef H.A. Dynamics and stratification of functional groups of micro- and mesoarthropods in the organic layer of a Scots pine forest. Biol. Fertil. Soils 26 (1998) 268-284 [b]
    • (1998) Biol. Fertil. Soils , vol.26 , pp. 268-284
    • Berg, M.P.1    Kniese, J.P.2    Bedaux, J.J.M.3    Verhoef, H.A.4
  • 9
    • 0034891145 scopus 로고    scopus 로고
    • Community food web, decomposition and nitrogen mineralization in a stratified Scots pine forest soil
    • Berg M.P., de Ruiter P.C., Didden W.A.M., Jansen M.P.M., Schouten A.T., and Verhoef H.A. Community food web, decomposition and nitrogen mineralization in a stratified Scots pine forest soil. Oikos 94 (2001) 130-142
    • (2001) Oikos , vol.94 , pp. 130-142
    • Berg, M.P.1    de Ruiter, P.C.2    Didden, W.A.M.3    Jansen, M.P.M.4    Schouten, A.T.5    Verhoef, H.A.6
  • 10
    • 4444367269 scopus 로고    scopus 로고
    • Secondary succession of terrestrial isopod, centipede, and millipede communities in grasslands under restoration
    • Berg M.P., and Hemerik L. Secondary succession of terrestrial isopod, centipede, and millipede communities in grasslands under restoration. Biol. Fertil. Soils 40 (2004) 163-170
    • (2004) Biol. Fertil. Soils , vol.40 , pp. 163-170
    • Berg, M.P.1    Hemerik, L.2
  • 11
    • 0027040654 scopus 로고
    • Soil nematode biodiversity
    • Bernard E.C. Soil nematode biodiversity. Biol. Fertil. Soils 14 (1992) 99-103
    • (1992) Biol. Fertil. Soils , vol.14 , pp. 99-103
    • Bernard, E.C.1
  • 12
    • 0003582338 scopus 로고
    • Bernays E.A., and Chapman R.F. (Eds), Chapman and Hall, London (312 pp)
    • Host-Plant Selection by Phytophagous Insects. In: Bernays E.A., and Chapman R.F. (Eds) (1994), Chapman and Hall, London (312 pp)
    • (1994) Host-Plant Selection by Phytophagous Insects
  • 13
    • 0028162738 scopus 로고
    • Feedback between plants and their soil communities in an old field community
    • Bever J.D. Feedback between plants and their soil communities in an old field community. Ecology 75 (1994) 1965-1977
    • (1994) Ecology , vol.75 , pp. 1965-1977
    • Bever, J.D.1
  • 14
    • 0037841979 scopus 로고    scopus 로고
    • Interactions between above- and belowground insect herbivores as mediated by the plant defence system
    • Bezemer T.M., Wagenaar R., Van Dam N.M., and Wackers F.L. Interactions between above- and belowground insect herbivores as mediated by the plant defence system. Oikos 101 (2003) 555-562
    • (2003) Oikos , vol.101 , pp. 555-562
    • Bezemer, T.M.1    Wagenaar, R.2    Van Dam, N.M.3    Wackers, F.L.4
  • 15
    • 2542548909 scopus 로고    scopus 로고
    • Protozoa and plant growth: the microbial loop in soil revisited
    • Bonkowski M. Protozoa and plant growth: the microbial loop in soil revisited. New Phytol. 162 (2004) 617-631
    • (2004) New Phytol. , vol.162 , pp. 617-631
    • Bonkowski, M.1
  • 16
    • 0034994068 scopus 로고    scopus 로고
    • The exploitation of mutualisms
    • Bronstein J.L. The exploitation of mutualisms. Ecol. Lett. 4 (2001) 277-287
    • (2001) Ecol. Lett. , vol.4 , pp. 277-287
    • Bronstein, J.L.1
  • 19
    • 0028161423 scopus 로고
    • Modelling food webs and nutrient cycling in agro-ecosystems
    • De Ruiter P.C., Neutel A.-M., and Moore J.C. Modelling food webs and nutrient cycling in agro-ecosystems. Trends Ecol. Evolut. 9 (1994) 378-383
    • (1994) Trends Ecol. Evolut. , vol.9 , pp. 378-383
    • De Ruiter, P.C.1    Neutel, A.-M.2    Moore, J.C.3
  • 20
    • 0038244828 scopus 로고    scopus 로고
    • Mixed blends of herbivore-induced plant volatiles and foraging success of carnivorous arthropods
    • Dicke M., De Boer J.G., Hofte M., and Rocha-Granados M.C. Mixed blends of herbivore-induced plant volatiles and foraging success of carnivorous arthropods. Oikos 101 (2003) 38-48
    • (2003) Oikos , vol.101 , pp. 38-48
    • Dicke, M.1    De Boer, J.G.2    Hofte, M.3    Rocha-Granados, M.C.4
  • 21
    • 0002287647 scopus 로고
    • Metal contamination affects size-structure and life-history dynamics in isopod field populations
    • Dallinger R., and Rainbow P.S. (Eds), Lewis Publishers, Sheffield
    • Donker M.H., Van Campelleveen H.E., and Van Straalen N. Metal contamination affects size-structure and life-history dynamics in isopod field populations. In: Dallinger R., and Rainbow P.S. (Eds). Ecotoxicology of Metals in Invertebrates (1991), Lewis Publishers, Sheffield 384-399
    • (1991) Ecotoxicology of Metals in Invertebrates , pp. 384-399
    • Donker, M.H.1    Van Campelleveen, H.E.2    Van Straalen, N.3
  • 23
    • 0842302424 scopus 로고    scopus 로고
    • Is microbial diversity fundamentally different from biodiversity of larger animals and plants?
    • Fenchel T., and Finlay B.J. Is microbial diversity fundamentally different from biodiversity of larger animals and plants?. Eur. J. Protistol. 39 (2003) 486-490
    • (2003) Eur. J. Protistol. , vol.39 , pp. 486-490
    • Fenchel, T.1    Finlay, B.J.2
  • 24
    • 21144481413 scopus 로고
    • New frontiers in nematode ecology
    • Ferris H. New frontiers in nematode ecology. J. Nematol. 25 (1993) 374-382
    • (1993) J. Nematol. , vol.25 , pp. 374-382
    • Ferris, H.1
  • 25
    • 33845215387 scopus 로고    scopus 로고
    • Darkness visible: reflection on underground ecology
    • (in press)
    • Fitter A. Darkness visible: reflection on underground ecology. J. Ecol. (2006) (in press)
    • (2006) J. Ecol.
    • Fitter, A.1
  • 27
    • 0028995751 scopus 로고
    • Adaptive plasticity and plasticity as an adaptation-a selective review of plasticity in animal morphology and life-history
    • Gotthard K., and Nylin S. Adaptive plasticity and plasticity as an adaptation-a selective review of plasticity in animal morphology and life-history. Oikos 74 (1995) 3-17
    • (1995) Oikos , vol.74 , pp. 3-17
    • Gotthard, K.1    Nylin, S.2
  • 28
    • 33845199084 scopus 로고    scopus 로고
    • The predatory mite Hyoaspis aculeifer is attracted to food of its fungivorous prey
    • Hall M., and Hedlund K. The predatory mite Hyoaspis aculeifer is attracted to food of its fungivorous prey. Pedobiologia (Jena) 43 (1999) 119-131
    • (1999) Pedobiologia (Jena) , vol.43 , pp. 119-131
    • Hall, M.1    Hedlund, K.2
  • 29
    • 0022193738 scopus 로고
    • The adaptive significance of coprophagous behaviour in the terrestrial isopod Porcellio scaber
    • Hassall M., and Rushton S.P. The adaptive significance of coprophagous behaviour in the terrestrial isopod Porcellio scaber. Pedobiologia (Jena) 28 (1985) 169-175
    • (1985) Pedobiologia (Jena) , vol.28 , pp. 169-175
    • Hassall, M.1    Rushton, S.P.2
  • 30
    • 0036234664 scopus 로고    scopus 로고
    • Effects of spatial heterogeneity on feeding behaviour of Porcellio scaber (Isopoda: Oniscidea)
    • Hassall M., Tuck J.M., Smith D.W., Gilroy J.J., and Addison R.K. Effects of spatial heterogeneity on feeding behaviour of Porcellio scaber (Isopoda: Oniscidea). Eur. J. Soil Biol. 38 (2002) 53-57
    • (2002) Eur. J. Soil Biol. , vol.38 , pp. 53-57
    • Hassall, M.1    Tuck, J.M.2    Smith, D.W.3    Gilroy, J.J.4    Addison, R.K.5
  • 31
    • 0141838220 scopus 로고    scopus 로고
    • Phenotypic plasticity and interpopulation differences in life history traits of Armadillidium vulgare (Isopoda: Oniscidea)
    • Hassall M., Heldon A., and Benton T. Phenotypic plasticity and interpopulation differences in life history traits of Armadillidium vulgare (Isopoda: Oniscidea). Oecologia 137 (2003) 85-89
    • (2003) Oecologia , vol.137 , pp. 85-89
    • Hassall, M.1    Heldon, A.2    Benton, T.3
  • 32
    • 15244340934 scopus 로고    scopus 로고
    • Ecotypic differentiation and phenotypic plasticity in reproductive traits of Armadillidium vulgare (Isopoda: Oniscidae)
    • Hassall M., Heldon A., Goldston A., and Grant A. Ecotypic differentiation and phenotypic plasticity in reproductive traits of Armadillidium vulgare (Isopoda: Oniscidae). Oecologia 143 (2004) 51-60
    • (2004) Oecologia , vol.143 , pp. 51-60
    • Hassall, M.1    Heldon, A.2    Goldston, A.3    Grant, A.4
  • 33
    • 29144458166 scopus 로고    scopus 로고
    • Some questions and possible new directions for research into the biology of terrestrial isopods
    • Hassall M., Zimmer M., and Loureiro S. Some questions and possible new directions for research into the biology of terrestrial isopods. Eur. J. Soil Biol. 41 (2005) 57-61
    • (2005) Eur. J. Soil Biol. , vol.41 , pp. 57-61
    • Hassall, M.1    Zimmer, M.2    Loureiro, S.3
  • 35
    • 8344221256 scopus 로고    scopus 로고
    • Biodiversity effects on soil processes explained by interspecific functional dissimilarity
    • Heemsbergen D., Berg M.P., Lorean M., van Hal J.R., Faber J.H., and Verhoef H.A. Biodiversity effects on soil processes explained by interspecific functional dissimilarity. Science 306 (2004) 1019-1020
    • (2004) Science , vol.306 , pp. 1019-1020
    • Heemsbergen, D.1    Berg, M.P.2    Lorean, M.3    van Hal, J.R.4    Faber, J.H.5    Verhoef, H.A.6
  • 36
    • 0024923919 scopus 로고
    • An analysis of food web- structure and function in a shortgrass praire, a mountain meadow, and a lodgepole pine forest
    • Ingham E.R., Coleman D.C., and Moore J.C. An analysis of food web- structure and function in a shortgrass praire, a mountain meadow, and a lodgepole pine forest. Biol. Fertil. Soils 8 (1989) 29-37
    • (1989) Biol. Fertil. Soils , vol.8 , pp. 29-37
    • Ingham, E.R.1    Coleman, D.C.2    Moore, J.C.3
  • 37
    • 0030303682 scopus 로고    scopus 로고
    • Reproductive allocation in the terrestrial isopods Porcellio scaber and Onicus asellus in a metal-polluted environment
    • Jones D.T., and Hopkin S.P. Reproductive allocation in the terrestrial isopods Porcellio scaber and Onicus asellus in a metal-polluted environment. Funct. Ecol. 10 (1996) 741-750
    • (1996) Funct. Ecol. , vol.10 , pp. 741-750
    • Jones, D.T.1    Hopkin, S.P.2
  • 38
    • 0035896350 scopus 로고    scopus 로고
    • Defensive function of herbivore-induced plant volatile emissions in nature
    • Kessler A., and Baldwin I.T. Defensive function of herbivore-induced plant volatile emissions in nature. Science 291 (2001) 2141-2144
    • (2001) Science , vol.291 , pp. 2141-2144
    • Kessler, A.1    Baldwin, I.T.2
  • 39
    • 0004246283 scopus 로고    scopus 로고
    • Kluwer Academic Press, Dordrecht (654 pp.)
    • Lavelle P., and Spain A.V. Soil Ecology (2001), Kluwer Academic Press, Dordrecht (654 pp.)
    • (2001) Soil Ecology
    • Lavelle, P.1    Spain, A.V.2
  • 40
    • 0003630281 scopus 로고    scopus 로고
    • Loreau M., Naeem S., and Inchausti P. (Eds), Oxford University Press, Oxford (294 pp)
    • Biodiversity and Ecosystem Functioning. In: Loreau M., Naeem S., and Inchausti P. (Eds) (2002), Oxford University Press, Oxford (294 pp)
    • (2002) Biodiversity and Ecosystem Functioning
  • 41
    • 33845210095 scopus 로고    scopus 로고
    • W.H. Mason, E.P. Odum, The effect of coprophagy on retention and bioelimination of radionuclides by detritus-feeding animals, Radioecology. Second National Symposium on Radioecology (1969) 721-725.
  • 42
    • 0027100731 scopus 로고    scopus 로고
    • Host-mediated interactions between two spatially separated insects
    • Masters G.J., and Brown V.K. Host-mediated interactions between two spatially separated insects. Funct. Ecol. 6 (1997) 175-179
    • (1997) Funct. Ecol. , vol.6 , pp. 175-179
    • Masters, G.J.1    Brown, V.K.2
  • 44
    • 0013312349 scopus 로고    scopus 로고
    • Biodiversity, ecosystem functioning and soil decomposer food webs
    • Loreau M., Naeem S., and Inchausti P. (Eds), Oxford University Press, Oxford
    • Mikola J., Bardgett R.D., and Hedlund K. Biodiversity, ecosystem functioning and soil decomposer food webs. In: Loreau M., Naeem S., and Inchausti P. (Eds). Biodiversity and Ecosystem Functioning (2002), Oxford University Press, Oxford 169-180
    • (2002) Biodiversity and Ecosystem Functioning , pp. 169-180
    • Mikola, J.1    Bardgett, R.D.2    Hedlund, K.3
  • 45
    • 0034823663 scopus 로고    scopus 로고
    • Detritivory, coprophagy and the evolution of digestive mutualisms in Dictyoptera
    • Nalepa C.A., Bignell D.E., and Bandi C. Detritivory, coprophagy and the evolution of digestive mutualisms in Dictyoptera. Insectes soc. 48 (2001) 194-201
    • (2001) Insectes soc. , vol.48 , pp. 194-201
    • Nalepa, C.A.1    Bignell, D.E.2    Bandi, C.3
  • 47
    • 0003799786 scopus 로고    scopus 로고
    • Sinauer Assoicates, Sunderland, MA (424 pp)
    • Roff D.A. Life History Evolution (2002), Sinauer Assoicates, Sunderland, MA (424 pp)
    • (2002) Life History Evolution
    • Roff, D.A.1
  • 49
    • 0034025216 scopus 로고    scopus 로고
    • The soil food web of two beech forests (Fagus sylvatica) of contrasting humus type: stable isotope analysis of a macro- and a mesofauna-dominated community
    • Scheu S., and Falca M. The soil food web of two beech forests (Fagus sylvatica) of contrasting humus type: stable isotope analysis of a macro- and a mesofauna-dominated community. Oecologia 123 (2000) 285-296
    • (2000) Oecologia , vol.123 , pp. 285-296
    • Scheu, S.1    Falca, M.2
  • 50
    • 1342332790 scopus 로고    scopus 로고
    • Single and mixed diets in Collembola: effects on reproduction and stable isotope fractionation
    • Scheu S., and Folger M. Single and mixed diets in Collembola: effects on reproduction and stable isotope fractionation. Funct. Ecol. 18 (2004) 94-102
    • (2004) Funct. Ecol. , vol.18 , pp. 94-102
    • Scheu, S.1    Folger, M.2
  • 51
    • 0002968796 scopus 로고    scopus 로고
    • Multitrophic interactions in decomposer communities
    • Tscharntke T., and Hawkins B.A. (Eds), Cambridge University Press, Cambridge
    • Scheu S., and Setälä H. Multitrophic interactions in decomposer communities. In: Tscharntke T., and Hawkins B.A. (Eds). Multitrophic Level Interactions (2002), Cambridge University Press, Cambridge 223-264
    • (2002) Multitrophic Level Interactions , pp. 223-264
    • Scheu, S.1    Setälä, H.2
  • 52
    • 19244381026 scopus 로고    scopus 로고
    • C and N mineralisation in the decomposer food webs of a European forest transect
    • Schröter D., Wolters V., and De Ruiter P.C. C and N mineralisation in the decomposer food webs of a European forest transect. Oikos 102 (2003) 294-308
    • (2003) Oikos , vol.102 , pp. 294-308
    • Schröter, D.1    Wolters, V.2    De Ruiter, P.C.3
  • 54
    • 4544324291 scopus 로고    scopus 로고
    • Decomposition rate of organic substrates in relation to the species diversity of soil saprophytic fungi
    • Setälä H., and McLean M.A. Decomposition rate of organic substrates in relation to the species diversity of soil saprophytic fungi. Oecologia 139 (2004) 98-107
    • (2004) Oecologia , vol.139 , pp. 98-107
    • Setälä, H.1    McLean, M.A.2
  • 56
    • 0004287950 scopus 로고
    • Princeton University Press, Princeton (247 pp)
    • Stephens D.W., and Krebs J.R. Foraging Theory (1986), Princeton University Press, Princeton (247 pp)
    • (1986) Foraging Theory
    • Stephens, D.W.1    Krebs, J.R.2
  • 59
    • 1842833415 scopus 로고    scopus 로고
    • Foraging behaviour of Armadillidium vulgare (Isopoda: Oniscidea) in heterogeneous environments
    • Tuck J.M., and Hassall M. Foraging behaviour of Armadillidium vulgare (Isopoda: Oniscidea) in heterogeneous environments. Behaviour 141 (2004) 233-244
    • (2004) Behaviour , vol.141 , pp. 233-244
    • Tuck, J.M.1    Hassall, M.2
  • 60
    • 0034958474 scopus 로고    scopus 로고
    • Parasites of mutualisms
    • Yu D.W. Parasites of mutualisms. Biol. J. Linnean Soc. 72 (2001) 529-546
    • (2001) Biol. J. Linnean Soc. , vol.72 , pp. 529-546
    • Yu, D.W.1
  • 62
    • 0344585335 scopus 로고    scopus 로고
    • Plant defense belowground and spatiotemporal processes in natural vegetation
    • Van der Putten W.H. Plant defense belowground and spatiotemporal processes in natural vegetation. Ecology 84 (2003) 2269-2280
    • (2003) Ecology , vol.84 , pp. 2269-2280
    • Van der Putten, W.H.1
  • 63
    • 0027029789 scopus 로고
    • Ecology of infochemical use by natural enemies in a tritrophic context
    • Vet L.E.M., and Dicke M. Ecology of infochemical use by natural enemies in a tritrophic context. Annu. Rev. Entomol. 37 (1992) 141-172
    • (1992) Annu. Rev. Entomol. , vol.37 , pp. 141-172
    • Vet, L.E.M.1    Dicke, M.2
  • 65
    • 0033006997 scopus 로고    scopus 로고
    • Interactions underground: soil biodiversity, mutualism and ecosystem processes
    • Wall D.H., and Moore J.C. Interactions underground: soil biodiversity, mutualism and ecosystem processes. Bioscience 49 (1999) 109-117
    • (1999) Bioscience , vol.49 , pp. 109-117
    • Wall, D.H.1    Moore, J.C.2
  • 66
    • 33845194613 scopus 로고    scopus 로고
    • Community assembly of terrestrial testate amoebae-is there any succession at all?
    • (in press)
    • Wanner M., and Xylander W.E.R. Community assembly of terrestrial testate amoebae-is there any succession at all?. Eur. J. Soil Biol. (2006) (in press)
    • (2006) Eur. J. Soil Biol.
    • Wanner, M.1    Xylander, W.E.R.2
  • 67
    • 0030437774 scopus 로고    scopus 로고
    • The quest for a contemporary ecological dimension to soil biology
    • Wardle D.A., and Giller K.E. The quest for a contemporary ecological dimension to soil biology. Soil Biol. Biochem. 28 (1997) 1549-1554
    • (1997) Soil Biol. Biochem. , vol.28 , pp. 1549-1554
    • Wardle, D.A.1    Giller, K.E.2
  • 68
    • 0030620268 scopus 로고    scopus 로고
    • Biodiversity and plant litter: experimental evidence which does not support the view that enhanced species richness improves ecosystem function
    • Wardle D.A., Bonner K.I., and Nicholson K.S. Biodiversity and plant litter: experimental evidence which does not support the view that enhanced species richness improves ecosystem function. Oikos 79 (1997) 247-258
    • (1997) Oikos , vol.79 , pp. 247-258
    • Wardle, D.A.1    Bonner, K.I.2    Nicholson, K.S.3
  • 71
    • 0036417904 scopus 로고    scopus 로고
    • The consequences of volatile organic compound mediated bacterial and fungal interactions
    • Wheatley R.E. The consequences of volatile organic compound mediated bacterial and fungal interactions. Antonie Van Leeuwenhoek 81 (2002) 357-364
    • (2002) Antonie Van Leeuwenhoek , vol.81 , pp. 357-364
    • Wheatley, R.E.1
  • 73
    • 3042529821 scopus 로고    scopus 로고
    • Earthworms and litter distribution affect plant defensive chemistry
    • Wurst S., Dugassa-Gobena D., and Scheu S. Earthworms and litter distribution affect plant defensive chemistry. J. Chem. Ecol. 30 (2004) 691-701
    • (2004) J. Chem. Ecol. , vol.30 , pp. 691-701
    • Wurst, S.1    Dugassa-Gobena, D.2    Scheu, S.3


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