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Volumn 79, Issue 1, 1998, Pages 138-152

Trophic cascades and compensation: Differential responses of microzooplankton in whole-lake experiments

Author keywords

Ciliates; Daphnia; Ecosystem experiments; Flagellates; Lakes; Rotifers; Trophic cascades; Zooplankton

Indexed keywords

COMMUNITY STRUCTURE; FOOD WEB; LAKE ECOSYSTEM; NUTRIENT ENRICHMENT; TROPHIC CASCADE; ZOOPLANKTON;

EID: 0031656683     PISSN: 00129658     EISSN: None     Source Type: Journal    
DOI: 10.1890/0012-9658(1998)079[0138:TCACDR]2.0.CO;2     Document Type: Article
Times cited : (97)

References (60)
  • 1
    • 0001306830 scopus 로고    scopus 로고
    • The role of indirect effects in food webs
    • G. A. Polis and K. O. Winemiller, editors. Chapman and Hall, New York, New York, USA
    • Abrams, P. A., B. A. Menge, G. G. Miltelbach, D. A. Spiller, and P. Yodzis. 1996. The role of indirect effects in food webs. Pages 371-395 in G. A. Polis and K. O. Winemiller, editors. Food webs: integration of patterns and dynamics. Chapman and Hall, New York, New York, USA.
    • (1996) Food Webs: Integration of Patterns and Dynamics , pp. 371-395
    • Abrams, P.A.1    Menge, B.A.2    Miltelbach, G.G.3    Spiller, D.A.4    Yodzis, P.5
  • 2
    • 0001046863 scopus 로고
    • Empirical relationships between bacterial abundance and chlorophyll concentration in fresh and marine waters
    • Bird, D. F., and J. Kalff. 1984. Empirical relationships between bacterial abundance and chlorophyll concentration in fresh and marine waters. Canadian Journal of Fisheries and Aquatic Sciences 41:1015-1023.
    • (1984) Canadian Journal of Fisheries and Aquatic Sciences , vol.41 , pp. 1015-1023
    • Bird, D.F.1    Kalff, J.2
  • 3
    • 0002588548 scopus 로고
    • Experimental community ecology: The desert granivore system
    • J. Diamond and T. J. Case, editors. Harper and Row, New York, New York, USA
    • Brown, J. H., D. W. Davidson, J. C. Munger, and R. S. Inouye. 1986. Experimental community ecology: the desert granivore system. Pages 41-62 in J. Diamond and T. J. Case, editors. Community ecology. Harper and Row, New York, New York, USA.
    • (1986) Community Ecology , pp. 41-62
    • Brown, J.H.1    Davidson, D.W.2    Munger, J.C.3    Inouye, R.S.4
  • 4
    • 0029659783 scopus 로고    scopus 로고
    • Relative impacts of copepods, cladocerans, and nutrients on the microbial food web of a mesotrophic lake
    • Burns, C. W., and M. Schallenberg. 1996. Relative impacts of copepods, cladocerans, and nutrients on the microbial food web of a mesotrophic lake. Journal of Plankton Research 18:683-714
    • (1996) Journal of Plankton Research , vol.18 , pp. 683-714
    • Burns, C.W.1    Schallenberg, M.2
  • 6
    • 0024910707 scopus 로고
    • Randomized intervention analysis and the interpretation of whole ecosystem experiments
    • Carpenter, S. R., T. M. Frost, D. Heisey, and T. K. Kratz. 1989. Randomized intervention analysis and the interpretation of whole ecosystem experiments. Ecology 70:1142- 1152.
    • (1989) Ecology , vol.70 , pp. 1142-1152
    • Carpenter, S.R.1    Frost, T.M.2    Heisey, D.3    Kratz, T.K.4
  • 9
    • 0001488965 scopus 로고
    • Cascading trophic interactions and lake productivity
    • Carpenter, S. R., J. F. Kitchell, and J. R. Hodgson. 1985. Cascading trophic interactions and lake productivity. BioScience 35:634-639.
    • (1985) BioScience , vol.35 , pp. 634-639
    • Carpenter, S.R.1    Kitchell, J.F.2    Hodgson, J.R.3
  • 12
    • 0027423877 scopus 로고
    • Potential role of fish predation and natural populations of zooplankton in structuring a plankton community in eutrophic lake water
    • Christoffersen, K., B. Riemann, A. Klysner, and M. Søndergaard. 1993. Potential role of fish predation and natural populations of zooplankton in structuring a plankton community in eutrophic lake water. Limnology and Oceanography 38:561-573.
    • (1993) Limnology and Oceanography , vol.38 , pp. 561-573
    • Christoffersen, K.1    Riemann, B.2    Klysner, A.3    Søndergaard, M.4
  • 13
    • 0002381096 scopus 로고
    • Bacterial pro- Auction in fresh and saltwater: A cross-system overview
    • Cole, J. J., S. Findlay, and M. L. Pace 1988. Bacterial pro- auction in fresh and saltwater: a cross-system overview. Marine Ecology Progress Series 43:1-10.
    • (1988) Marine Ecology Progress Series , vol.43 , pp. 1-10
    • Cole, J.J.1    Findlay, S.2    Pace, M.L.3
  • 14
    • 0028976908 scopus 로고
    • Effects of food web compensation after manipulation of rainbow trout in an oligotrophic lake
    • Elser, J. J., C. Luecke, M. T. Brett, and C. R. Goldman. 1995. Effects of food web compensation after manipulation of rainbow trout in an oligotrophic lake. Ecology 76:52-69.
    • (1995) Ecology , vol.76 , pp. 52-69
    • Elser, J.J.1    Luecke, C.2    Brett, M.T.3    Goldman, C.R.4
  • 15
    • 0001936783 scopus 로고
    • Species compensation and complementarity in ecosystem function
    • C. G. Jones and J. H. Lawton, editors. Chapman and Hall, New York, New York, USA
    • Frost, T. M., S. R. Carpenter, A. R. Ives, and T. K. Kratz. 1995. Species compensation and complementarity in ecosystem function. Pages 224-239 in C. G. Jones and J. H. Lawton, editors. Linking species and ecosystems. Chapman and Hall, New York, New York, USA.
    • (1995) Linking Species and Ecosystems , pp. 224-239
    • Frost, T.M.1    Carpenter, S.R.2    Ives, A.R.3    Kratz, T.K.4
  • 16
    • 0028161558 scopus 로고
    • A framework for the assessment of topdown vs. bottom-up control of heterotrophic nanoflagellate abundance
    • Gasol, J. M. 1994. A framework for the assessment of topdown vs. bottom-up control of heterotrophic nanoflagellate abundance. Marine Ecology Progress Series 113:291-300.
    • (1994) Marine Ecology Progress Series , vol.113 , pp. 291-300
    • Gasol, J.M.1
  • 17
    • 0028983255 scopus 로고
    • Patterns in the top-down versus bottom-up regulation of heterotrophic nanoflagellates in temperate lakes
    • Gasol, J. M., and J. Kalff. 1995. Patterns in the top-down versus bottom-up regulation of heterotrophic nanoflagellates in temperate lakes. Journal of Plankton Research 17: 1879-1903.
    • (1995) Journal of Plankton Research , vol.17 , pp. 1879-1903
    • Gasol, J.M.1    Kalff, J.2
  • 18
    • 0027847777 scopus 로고
    • Lack of coupling between heterotrophic nanoflagellates and bacteria: A general phenomenon across aquatic systems?
    • Gasol, J. M., and D. Vaqué. 1993. Lack of coupling between heterotrophic nanoflagellates and bacteria: a general phenomenon across aquatic systems? Limnology and Oceanography 38:657-665.
    • (1993) Limnology and Oceanography , vol.38 , pp. 657-665
    • Gasol, J.M.1    Vaqué, D.2
  • 19
    • 0024181635 scopus 로고
    • Suppression of rotifer populations by Daphnia: A review of the evidence, the mechanisms, and the effects on zooplankton community structure
    • Gilbert, J. J. 1988a. Suppression of rotifer populations by Daphnia: A review of the evidence, the mechanisms, and the effects on zooplankton community structure. Limnology and Oceanography 33:1286-1303.
    • (1988) Limnology and Oceanography , vol.33 , pp. 1286-1303
    • Gilbert, J.J.1
  • 20
    • 0024187599 scopus 로고
    • Susceptibilities of ten rotifer species to interference from Daphnia pulex
    • _. 1988b. Susceptibilities of ten rotifer species to interference from Daphnia pulex. Ecology 69:1826-1838.
    • (1988) Ecology , vol.69 , pp. 1826-1838
  • 21
    • 51249173085 scopus 로고
    • Direct and indirect influences of crustacean Zooplankton on bacterioplankton of Lake Constance
    • Güde, H. 1988. Direct and indirect influences of crustacean Zooplankton on bacterioplankton of Lake Constance. Hydrobiologia 159:63-73.
    • (1988) Hydrobiologia , vol.159 , pp. 63-73
    • Güde, H.1
  • 22
    • 0026579951 scopus 로고
    • Playing chutes and ladders: Heterogeneity and the relative roles of bottom-up and top-down forces in natural communities
    • Hunter, M. D., and P. W. Price. 1992. Playing chutes and ladders: heterogeneity and the relative roles of bottom-up and top-down forces in natural communities. Ecology 73: 724-732.
    • (1992) Ecology , vol.73 , pp. 724-732
    • Hunter, M.D.1    Price, P.W.2
  • 23
    • 0027794991 scopus 로고
    • Susceptibilities of different-sized ciliates to direct suppression by small and large cladocerans
    • Jack, J. D., and J. J. Gilbert. 1993. Susceptibilities of different-sized ciliates to direct suppression by small and large cladocerans. Freshwater Biology 29:19-29.
    • (1993) Freshwater Biology , vol.29 , pp. 19-29
    • Jack, J.D.1    Gilbert, J.J.2
  • 24
    • 0344071642 scopus 로고
    • The impact of Daphnia on microbial food webs-a review
    • Jürgens, K. 1994. The impact of Daphnia on microbial food webs-a review. Marine Microbial Food Webs 5:27-37.
    • (1994) Marine Microbial Food Webs , vol.5 , pp. 27-37
    • Jürgens, K.1
  • 25
    • 0028084103 scopus 로고
    • Control of heterotrophic bacteria and protozoans by Daphnia pulex in the epilimnion of Lake Ciso
    • Jürgens, K., J. M. Gasol, R. Massana, and C. Pedrós-Aliö. 1994. Control of heterotrophic bacteria and protozoans by Daphnia pulex in the epilimnion of Lake Ciso. Archiv für Hydrobiologie 131:55-78.
    • (1994) Archiv Für Hydrobiologie , vol.131 , pp. 55-78
    • Jürgens, K.1    Gasol, J.M.2    Massana, R.3    Pedrós-Aliö, C.4
  • 26
    • 0001301249 scopus 로고
    • Redundancy in ecosystems
    • E. Detlef-Schulze and H. A. Mooney, editors. Springer-Verlag, New York, New York, USA
    • Lawton, J H., and V. K. Brown. 1993. Redundancy in ecosystems. Pages 255-270 in E. Detlef-Schulze and H. A. Mooney, editors. Biodiversity and ecosystem function. Springer-Verlag, New York, New York, USA.
    • (1993) Biodiversity and Ecosystem Function , pp. 255-270
    • Lawton, J.H.1    Brown, V.K.2
  • 27
    • 0024878191 scopus 로고
    • Resource edibility and the effects of predators and productivity on the outcome of trophic interactions
    • Leibold, M. A. 1989. Resource edibility and the effects of predators and productivity on the outcome of trophic interactions. American Naturalist 134:922-948.
    • (1989) American Naturalist , vol.134 , pp. 922-948
    • Leibold, M.A.1
  • 28
    • 85038535561 scopus 로고    scopus 로고
    • Grazer and nutrient impacts on epilimnetic ciliate communities
    • In press
    • Marchessault, P., and A. Mazumder. In press. Grazer and nutrient impacts on epilimnetic ciliate communities. Limnology and Oceanography.
    • Limnology and Oceanography
    • Marchessault, P.1    Mazumder, A.2
  • 29
    • 0028177850 scopus 로고
    • Patterns of algal biomass in dominant odd- Vs. even-link lake ecosystems
    • Mazumder, A. 1994. Patterns of algal biomass in dominant odd- vs. even-link lake ecosystems. Ecology 75:1141- 1149.
    • (1994) Ecology , vol.75 , pp. 1141-1149
    • Mazumder, A.1
  • 31
    • 0001689684 scopus 로고
    • The estimation of the abundance and biomass of Zooplankton in samples
    • J. A. Downing and F. H. Rigler. editors. Blackwell Scientific, Oxford, UK
    • McCauley, E. 1984. The estimation of the abundance and biomass of Zooplankton in samples. Pages 228-265 in J. A. Downing and F. H. Rigler. editors. A manual on methods for the assessment of secondary productivity in fresh waters. Blackwell Scientific, Oxford, UK.
    • (1984) A Manual on Methods for the Assessment of Secondary Productivity in Fresh Waters , pp. 228-265
    • McCauley, E.1
  • 32
    • 0024221764 scopus 로고
    • Competition between aquatic insects and vertebrates: Experimental measures of interaction strength and higher order interactions
    • Morin, P J., S. P. Lawler, and E. A. Johnson. 1988. Competition between aquatic insects and vertebrates: experimental measures of interaction strength and higher order interactions. Ecology 69:1401-1409.
    • (1988) Ecology , vol.69 , pp. 1401-1409
    • Morin, P.J.1    Lawler, S.P.2    Johnson, E.A.3
  • 33
    • 0021593773 scopus 로고
    • Zooplankton community structure, but not biomass, influences the phosphorus-chlorophyll a relationship
    • Pace, M. L. 1984. Zooplankton community structure, but not biomass, influences the phosphorus-chlorophyll a relationship. Canadian Journal of Fisheries and Aquatic Sciences 41:1089-1096.
    • (1984) Canadian Journal of Fisheries and Aquatic Sciences , vol.41 , pp. 1089-1096
    • Pace, M.L.1
  • 34
    • 0022836804 scopus 로고
    • An empirical analysis of zooplanklon community structure
    • _. 1986. An empirical analysis of zooplanklon community structure. Limnology and Oceanography 31:45-55.
    • (1986) Limnology and Oceanography , vol.31 , pp. 45-55
  • 35
    • 0000121756 scopus 로고
    • Comparative and experimental approaches to top-down and bottom-up regulation of bacteria
    • Pace, M. L., and J. J. Cole. 1994. Comparative and experimental approaches to top-down and bottom-up regulation of bacteria. Microbial Ecology 28:181-193.
    • (1994) Microbial Ecology , vol.28 , pp. 181-193
    • Pace, M.L.1    Cole, J.J.2
  • 36
    • 0001749018 scopus 로고    scopus 로고
    • Regulation of bacteria by resources and predation tested in whole lake experiments
    • Pace, M. L., and J. J. Cole. 1996. Regulation of bacteria by resources and predation tested in whole lake experiments, Limnology and Oceanography 42:1448-1459.
    • (1996) Limnology and Oceanography , vol.42 , pp. 1448-1459
    • Pace, M.L.1    Cole, J.J.2
  • 37
    • 0026005412 scopus 로고
    • Regulation of planktonic microbial communities by nutrients and herbivores
    • Pace, M. L., and E. Funke. 1991. Regulation of planktonic microbial communities by nutrients and herbivores. Ecology 72:904-914.
    • (1991) Ecology , vol.72 , pp. 904-914
    • Pace, M.L.1    Funke, E.2
  • 38
    • 0025526837 scopus 로고
    • Plankton community structure determines the fate of bacterial production in a temperate lake
    • Pace, M. L., G. B. McManus, and S. E. G. Findlay. 1990. Plankton community structure determines the fate of bacterial production in a temperate lake. Limnology and Oceanography 35:795-808
    • (1990) Limnology and Oceanography , vol.35 , pp. 795-808
    • Pace, M.L.1    McManus, G.B.2    Findlay, S.E.G.3
  • 39
    • 0028162578 scopus 로고
    • The importance of Daphnia in determining mortality rates of protozoans and rotifers in lakes
    • Pace, M. L., and D. Vaqué. 1994. The importance of Daphnia in determining mortality rates of protozoans and rotifers in lakes. Limnology and Oceanography 39:985-996.
    • (1994) Limnology and Oceanography , vol.39 , pp. 985-996
    • Pace, M.L.1    Vaqué, D.2
  • 40
    • 0000149002 scopus 로고
    • Food webs: Linkage, interaction strength and community infrastructure
    • Paine, R. T. 1980. Food webs: linkage, interaction strength and community infrastructure. Journal of Animal Ecology 49:667-685.
    • (1980) Journal of Animal Ecology , vol.49 , pp. 667-685
    • Paine, R.T.1
  • 41
    • 0004295054 scopus 로고
    • University of Chicago Press, Chicago. IIIinois, USA
    • Pimm, S. L. 1991. The balance of nature? University of Chicago Press, Chicago. IIIinois, USA.
    • (1991) The Balance of Nature?
    • Pimm, S.L.1
  • 42
    • 0003046332 scopus 로고    scopus 로고
    • Time, space, and life history: Influences on food webs
    • G. A. Polis and K. O. Winemiller. editors. Chapman and Hall. New York, New York, USA
    • Polis, G. A., R. D. Holt, B. A. Menge, and K. O. Winemiller. 1996. Time, space, and life history: influences on food webs. Pages 435-460 in G. A. Polis and K. O. Winemiller. editors. Food webs: integration of patterns and dynamics. Chapman and Hall. New York, New York, USA.
    • (1996) Food Webs: Integration of Patterns and Dynamics , pp. 435-460
    • Polis, G.A.1    Holt, R.D.2    Menge, B.A.3    Winemiller, K.O.4
  • 43
    • 0001872140 scopus 로고    scopus 로고
    • Integrating the microbial loop and the classic food chain into a realistic planktonic food web
    • G. A. Polis and K. O. Winemiller, editors. Chapman and Hall, New York, New York, USA
    • Porter, K. G. 1996. Integrating the microbial loop and the classic food chain into a realistic planktonic food web. Pages 51-59 in G. A. Polis and K. O. Winemiller, editors. Food webs: integration of patterns and dynamics. Chapman and Hall, New York, New York, USA.
    • (1996) Food Webs: Integration of Patterns and Dynamics , pp. 51-59
    • Porter, K.G.1
  • 44
    • 0022193254 scopus 로고
    • Potential importance of fish predation and zooplankton grazing on natural populations of freshwater bacteria
    • Riemann, B. 1985. Potential importance of fish predation and zooplankton grazing on natural populations of freshwater bacteria. Applied and Environmental Microbiology 50:187-193.
    • (1985) Applied and Environmental Microbiology , vol.50 , pp. 187-193
    • Riemann, B.1
  • 46
    • 0027091904 scopus 로고
    • Relationships between bacteria and heterotrophic nano- Plankton in marine and fresh waters: An inter-ecosystem comparison
    • Sanders, R. W., D. A. Caron, and U -G. Berninger. 1992. Relationships between bacteria and heterotrophic nano- plankton in marine and fresh waters: an inter-ecosystem comparison. Marine Ecology Progress Scries 86:1-14.
    • (1992) Marine Ecology Progress Scries , vol.86 , pp. 1-14
    • Sanders, R.W.1    Caron, D.A.2    Berninger, U.G.3
  • 47
    • 0028565169 scopus 로고
    • Grazing by rotifers and crustacean zooplankton on nanoplanktonic protists
    • Sanders, R. W., D. A. Leeper, C. H. King, and K. G. Porter. 1994. Grazing by rotifers and crustacean zooplankton on nanoplanktonic protists. Hydrobiologia 288:167-181.
    • (1994) Hydrobiologia , vol.288 , pp. 167-181
    • Sanders, R.W.1    Leeper, D.A.2    King, C.H.3    Porter, K.G.4
  • 48
    • 0003435437 scopus 로고
    • SAS Institute Incorporated, Cary, North Carolina, USA
    • SAS Institute. 1988. SAS/ETS user's guide. SAS Institute Incorporated, Cary, North Carolina, USA.
    • (1988) SAS/ETS User's Guide
  • 49
    • 15844367939 scopus 로고
    • Bacterivory and herbivory: Key roles of phagotrophic protists in pelagic food webs
    • Sherr, E. B., and B. F Sherr. 1994. Bacterivory and herbivory: key roles of phagotrophic protists in pelagic food webs. Microbial Ecology 28:223-235.
    • (1994) Microbial Ecology , vol.28 , pp. 223-235
    • Sherr, E.B.1    Sherr, B.F.2
  • 50
    • 0001489659 scopus 로고
    • Abundance and productivity of hcterotrophic nanoplankton in Georgia coastal waters
    • Sherr, B. F., E. B. Sherr, and S. Y. Newell. 1984. Abundance and productivity of hcterotrophic nanoplankton in Georgia coastal waters. Journal of Plankton Research 6:195-202.
    • (1984) Journal of Plankton Research , vol.6 , pp. 195-202
    • Sherr, B.F.1    Sherr, E.B.2    Newell, S.Y.3
  • 51
    • 0003055863 scopus 로고
    • Predators and prey lifestyles: An evolutionary and ecological overview
    • W. C. Kerfoot and A. Sih. editors. University Press of New England, Hanover, New Hampshire, USA
    • Sih, A. 1987. Predators and prey lifestyles: an evolutionary and ecological overview. Pages 203-224 in W. C. Kerfoot and A. Sih. editors. Predation: direct and indirect impacts on aquatic communities. University Press of New England, Hanover, New Hampshire, USA.
    • (1987) Predation: Direct and Indirect Impacts on Aquatic Communities , pp. 203-224
    • Sih, A.1
  • 52
    • 0002277541 scopus 로고
    • Microbial food webs in freshwater planktonic ecosystems
    • S. R. Carpenter, editor. Springer-Verlag, New York. New York, USA
    • Stockner, J. G., and K. G. Porter. 1988. Microbial food webs in freshwater planktonic ecosystems. Pages 69-83 in S. R. Carpenter, editor. Complex interactions in lake communities. Springer-Verlag, New York. New York, USA.
    • (1988) Complex Interactions in Lake Communities , pp. 69-83
    • Stockner, J.G.1    Porter, K.G.2
  • 53
    • 0026549291 scopus 로고
    • Are trophic cascades all wet? Differentiation and donor-control in speciose ecosystems
    • Strong, D. R. 1992. Are trophic cascades all wet? Differentiation and donor-control in speciose ecosystems. Ecology 73:747-754.
    • (1992) Ecology , vol.73 , pp. 747-754
    • Strong, D.R.1
  • 54
    • 0003828507 scopus 로고
    • Addison-Wesley. New York, New York, USA
    • Wei, W. W. S. 1990. Time series analysis. Addison-Wesley. New York, New York, USA.
    • (1990) Time Series Analysis
    • Wei, W.W.S.1
  • 55
    • 0026080294 scopus 로고
    • The annual cycle of heterotrophic freshwater nanoflagellates: Role of bottom-up and top-down control
    • Weisse, T. 1991. The annual cycle of heterotrophic freshwater nanoflagellates: role of bottom-up and top-down control. Journal of Plankton Research 13:167-185.
    • (1991) Journal of Plankton Research , vol.13 , pp. 167-185
    • Weisse, T.1
  • 57
    • 0026304608 scopus 로고
    • Relative vulnerabilities of natural rotifer and ciliate communities to cladocerans: Laboratory and field experiments
    • Wickham, S. A., and J. J. Gilbert. 1991. Relative vulnerabilities of natural rotifer and ciliate communities to cladocerans: laboratory and field experiments. Freshwater Biology 26:77-86.
    • (1991) Freshwater Biology , vol.26 , pp. 77-86
    • Wickham, S.A.1    Gilbert, J.J.2
  • 58
    • 0001561225 scopus 로고
    • The comparative importance of competition and predation by Daphnia on ciliated protists
    • Wickham, S. A., and J. J. Gilbert. 1993. The comparative importance of competition and predation by Daphnia on ciliated protists. Archiv für Hydrobiologie 126:289-313
    • (1993) Archiv Für Hydrobiologie , vol.126 , pp. 289-313
    • Wickham, S.A.1    Gilbert, J.J.2
  • 59
    • 0028176218 scopus 로고
    • Predicting direct and indirect effects: An integrated approach using experiments and path analysis
    • Wootton, J. T. 1994. Predicting direct and indirect effects: an integrated approach using experiments and path analysis. Ecology 75:151-165.
    • (1994) Ecology , vol.75 , pp. 151-165
    • Wootton, J.T.1
  • 60
    • 0024265688 scopus 로고
    • The indeterminancy of ecological interactions
    • Yodzis, P. 1988. The indeterminancy of ecological interactions. Ecology 69:508-515.
    • (1988) Ecology , vol.69 , pp. 508-515
    • Yodzis, P.1


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