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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Ecology and Evolution 34 7634 7383 470 446 100 4350

Ora E. Johannsson publications per year

The chart shows the history of publications by Ora E. Johannsson between 1971 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ora E. Johannsson published across 56 years, from 1971 to 2026, averaging 1.8 papers a year. Output peaked at 6 publications in 2003. 6 of the 101 publications appeared in the last two years.

No. of publications
2 4 6
Bar chart. Horizontal axis: year, 1971 to 2026. Vertical axis: number of publications, 0 to 6. Peak 6 publications in 2003. 1971: 1 publication 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 0 publications 1980: 1 publication 1981: 0 publications 1982: 0 publications 1983: 1 publication 1984: 0 publications 1985: 1 publication 1986: 0 publications 1987: 2 publications 1988: 0 publications 1989: 0 publications 1990: 2 publications 1991: 3 publications 1992: 1 publication 1993: 0 publications 1994: 2 publications 1995: 3 publications 1996: 3 publications 1997: 4 publications 1998: 2 publications 1999: 3 publications 2000: 2 publications 2001: 3 publications 2002: 1 publication 2003: 6 publications 2004: 2 publications 2005: 2 publications 2006: 5 publications 2007: 3 publications 2008: 5 publications 2009: 2 publications 2010: 3 publications 2011: 5 publications 2012: 3 publications 2013: 2 publications 2014: 2 publications 2015: 0 publications 2016: 6 publications 2017: 1 publication 2018: 2 publications 2019: 2 publications 2020: 2 publications 2021: 2 publications 2022: 3 publications 2023: 1 publication 2024: 1 publication 2025: 4 publications 2026: 2 publications
1971 2026

101 publications in total across all disciplines

View publications per year as a table
Ora E. Johannsson: publications per year, 1971 to 2026
Year Publications
1971 1
1972 0
1973 0
1974 0
1975 0
1976 0
1977 0
1978 0
1979 0
1980 1
1981 0
1982 0
1983 1
1984 0
1985 1
1986 0
1987 2
1988 0
1989 0
1990 2
1991 3
1992 1
1993 0
1994 2
1995 3
1996 3
1997 4
1998 2
1999 3
2000 2
2001 3
2002 1
2003 6
2004 2
2005 2
2006 5
2007 3
2008 5
2009 2
2010 3
2011 5
2012 3
2013 2
2014 2
2015 0
2016 6
2017 1
2018 2
2019 2
2020 2
2021 2
2022 3
2023 1
2024 1
2025 4
2026 2
Total 101
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Ora E. Johannsson publication distribution in Ecology and Evolution in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Ecology and Evolution in 2026. The highlighted bar marks where Ora E. Johannsson sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 100 bars. Horizontal axis: publications, 37–41 to 531+. Vertical axis: number of scientists, 0 to 333. Most scientists, 333, have 97–101 publications. The last bar groups every scientist with 531 publications or more. The highlighted bar, 97–101 publications, is where this scientist sits. 37–41 publications: 2 scientists 42–46 publications: 9 scientists 47–51 publications: 10 scientists 52–56 publications: 31 scientists 57–61 publications: 56 scientists 62–66 publications: 91 scientists 67–71 publications: 92 scientists 72–76 publications: 127 scientists 77–81 publications: 173 scientists 82–86 publications: 236 scientists 87–91 publications: 227 scientists 92–96 publications: 240 scientists 97–101 publications: 333 scientists 102–106 publications: 280 scientists 107–111 publications: 300 scientists 112–116 publications: 285 scientists 117–121 publications: 305 scientists 122–126 publications: 287 scientists 127–131 publications: 278 scientists 132–136 publications: 289 scientists 137–141 publications: 273 scientists 142–146 publications: 262 scientists 147–151 publications: 246 scientists 152–156 publications: 235 scientists 157–161 publications: 205 scientists 162–166 publications: 199 scientists 167–171 publications: 174 scientists 172–176 publications: 164 scientists 177–181 publications: 173 scientists 182–186 publications: 189 scientists 187–191 publications: 170 scientists 192–196 publications: 139 scientists 197–201 publications: 128 scientists 202–206 publications: 117 scientists 207–211 publications: 115 scientists 212–216 publications: 107 scientists 217–221 publications: 124 scientists 222–226 publications: 81 scientists 227–231 publications: 82 scientists 232–236 publications: 85 scientists 237–241 publications: 75 scientists 242–246 publications: 66 scientists 247–251 publications: 81 scientists 252–256 publications: 69 scientists 257–261 publications: 70 scientists 262–266 publications: 55 scientists 267–271 publications: 64 scientists 272–276 publications: 49 scientists 277–281 publications: 48 scientists 282–286 publications: 44 scientists 287–291 publications: 45 scientists 292–296 publications: 36 scientists 297–301 publications: 39 scientists 302–306 publications: 38 scientists 307–311 publications: 30 scientists 312–316 publications: 34 scientists 317–321 publications: 25 scientists 322–326 publications: 22 scientists 327–331 publications: 28 scientists 332–336 publications: 30 scientists 337–341 publications: 22 scientists 342–346 publications: 30 scientists 347–351 publications: 26 scientists 352–356 publications: 22 scientists 357–361 publications: 29 scientists 362–366 publications: 21 scientists 367–371 publications: 12 scientists 372–376 publications: 18 scientists 377–381 publications: 17 scientists 382–386 publications: 13 scientists 387–391 publications: 21 scientists 392–396 publications: 13 scientists 397–401 publications: 10 scientists 402–406 publications: 15 scientists 407–411 publications: 8 scientists 412–416 publications: 9 scientists 417–421 publications: 8 scientists 422–426 publications: 4 scientists 427–431 publications: 10 scientists 432–436 publications: 10 scientists 437–441 publications: 5 scientists 442–446 publications: 4 scientists 447–451 publications: 10 scientists 452–456 publications: 2 scientists 457–461 publications: 4 scientists 462–466 publications: 7 scientists 467–471 publications: 7 scientists 472–476 publications: 6 scientists 477–481 publications: 6 scientists 482–486 publications: 3 scientists 487–491 publications: 3 scientists 492–496 publications: 4 scientists 497–501 publications: 4 scientists 502–506 publications: 8 scientists 507–511 publications: 5 scientists 512–516 publications: 4 scientists 517–521 publications: 5 scientists 522–526 publications: 4 scientists 527–530 publications: 5 scientists 531+ publications: 100 scientists
37–41 publications 531+

This scientist: 100 publications — 19th percentile

19% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 531 publications or more.

View publications distribution as a table
Number of Ecology and Evolution scientists by publication count, Research.com 2026 ranking edition. Based on 8,381 ranked scientists.
Publications Scientists This scientist
37–41 2
42–46 9
47–51 10
52–56 31
57–61 56
62–66 91
67–71 92
72–76 127
77–81 173
82–86 236
87–91 227
92–96 240
97–101 333 100
102–106 280
107–111 300
112–116 285
117–121 305
122–126 287
127–131 278
132–136 289
137–141 273
142–146 262
147–151 246
152–156 235
157–161 205
162–166 199
167–171 174
172–176 164
177–181 173
182–186 189
187–191 170
192–196 139
197–201 128
202–206 117
207–211 115
212–216 107
217–221 124
222–226 81
227–231 82
232–236 85
237–241 75
242–246 66
247–251 81
252–256 69
257–261 70
262–266 55
267–271 64
272–276 49
277–281 48
282–286 44
287–291 45
292–296 36
297–301 39
302–306 38
307–311 30
312–316 34
317–321 25
322–326 22
327–331 28
332–336 30
337–341 22
342–346 30
347–351 26
352–356 22
357–361 29
362–366 21
367–371 12
372–376 18
377–381 17
382–386 13
387–391 21
392–396 13
397–401 10
402–406 15
407–411 8
412–416 9
417–421 8
422–426 4
427–431 10
432–436 10
437–441 5
442–446 4
447–451 10
452–456 2
457–461 4
462–466 7
467–471 7
472–476 6
477–481 6
482–486 3
487–491 3
492–496 4
497–501 4
502–506 8
507–511 5
512–516 4
517–521 5
522–526 4
527–530 5
531+ 100
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Ora E. Johannsson D-index placement in Ecology and Evolution in 2026

The chart shows the D-index (discipline H-index) distribution of Ecology and Evolution scientists ranked by Research.com in 2026. The highlighted bar marks where Ora E. Johannsson sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 92 bars. Horizontal axis: D-Index, 30 to 121+. Vertical axis: number of scientists, 0 to 280. Most scientists, 280, have 40 D-Index. The last bar groups every scientist with 121 D-Index or more. The highlighted bar, 34 D-Index, is where this scientist sits. 30 D-Index: 95 scientists 31 D-Index: 123 scientists 32 D-Index: 191 scientists 33 D-Index: 245 scientists 34 D-Index: 252 scientists 35 D-Index: 244 scientists 36 D-Index: 249 scientists 37 D-Index: 244 scientists 38 D-Index: 254 scientists 39 D-Index: 254 scientists 40 D-Index: 280 scientists 41 D-Index: 274 scientists 42 D-Index: 266 scientists 43 D-Index: 233 scientists 44 D-Index: 248 scientists 45 D-Index: 208 scientists 46 D-Index: 201 scientists 47 D-Index: 213 scientists 48 D-Index: 207 scientists 49 D-Index: 172 scientists 50 D-Index: 209 scientists 51 D-Index: 199 scientists 52 D-Index: 153 scientists 53 D-Index: 169 scientists 54 D-Index: 163 scientists 55 D-Index: 148 scientists 56 D-Index: 120 scientists 57 D-Index: 146 scientists 58 D-Index: 137 scientists 59 D-Index: 140 scientists 60 D-Index: 104 scientists 61 D-Index: 119 scientists 62 D-Index: 118 scientists 63 D-Index: 99 scientists 64 D-Index: 77 scientists 65 D-Index: 100 scientists 66 D-Index: 86 scientists 67 D-Index: 83 scientists 68 D-Index: 75 scientists 69 D-Index: 94 scientists 70 D-Index: 57 scientists 71 D-Index: 68 scientists 72 D-Index: 59 scientists 73 D-Index: 63 scientists 74 D-Index: 66 scientists 75 D-Index: 60 scientists 76 D-Index: 42 scientists 77 D-Index: 49 scientists 78 D-Index: 39 scientists 79 D-Index: 37 scientists 80 D-Index: 43 scientists 81 D-Index: 41 scientists 82 D-Index: 45 scientists 83 D-Index: 34 scientists 84 D-Index: 40 scientists 85 D-Index: 35 scientists 86 D-Index: 55 scientists 87 D-Index: 24 scientists 88 D-Index: 24 scientists 89 D-Index: 30 scientists 90 D-Index: 23 scientists 91 D-Index: 25 scientists 92 D-Index: 27 scientists 93 D-Index: 27 scientists 94 D-Index: 13 scientists 95 D-Index: 23 scientists 96 D-Index: 12 scientists 97 D-Index: 14 scientists 98 D-Index: 19 scientists 99 D-Index: 16 scientists 100 D-Index: 14 scientists 101 D-Index: 5 scientists 102 D-Index: 21 scientists 103 D-Index: 16 scientists 104 D-Index: 10 scientists 105 D-Index: 7 scientists 106 D-Index: 7 scientists 107 D-Index: 7 scientists 108 D-Index: 6 scientists 109 D-Index: 9 scientists 110 D-Index: 11 scientists 111 D-Index: 12 scientists 112 D-Index: 9 scientists 113 D-Index: 7 scientists 114 D-Index: 3 scientists 115 D-Index: 8 scientists 116 D-Index: 5 scientists 117 D-Index: 11 scientists 118 D-Index: 4 scientists 119 D-Index: 2 scientists 120 D-Index: 5 scientists 121+ D-Index: 100 scientists
30 D-Index 121+

This scientist: 34 D-Index — 11th percentile

11% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 121 D-Index or more.

View D-Index distribution as a table
Number of Ecology and Evolution scientists by D-index, Research.com 2026 ranking edition. Based on 8,381 ranked scientists.
D-Index Scientists This scientist
30 95
31 123
32 191
33 245
34 252 34
35 244
36 249
37 244
38 254
39 254
40 280
41 274
42 266
43 233
44 248
45 208
46 201
47 213
48 207
49 172
50 209
51 199
52 153
53 169
54 163
55 148
56 120
57 146
58 137
59 140
60 104
61 119
62 118
63 99
64 77
65 100
66 86
67 83
68 75
69 94
70 57
71 68
72 59
73 63
74 66
75 60
76 42
77 49
78 39
79 37
80 43
81 41
82 45
83 34
84 40
85 35
86 55
87 24
88 24
89 30
90 23
91 25
92 27
93 27
94 13
95 23
96 12
97 14
98 19
99 16
100 14
101 5
102 21
103 16
104 10
105 7
106 7
107 7
108 6
109 9
110 11
111 12
112 9
113 7
114 3
115 8
116 5
117 11
118 4
119 2
120 5
121+ 100
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Overview

Ora E. Johannsson is affiliated with the University of British Columbia in Canada. Their research primarily spans the fields of Environmental Science, Earth and Planetary Sciences, and Agricultural and Biological Sciences. Within these areas, their work extends into several subfields including Ecology, Aquatic Science, Oceanography, Nature and Landscape Conservation, and Health, Toxicology and Mutagenesis.

The scientist's research topics cover Aquaculture Nutrition and Growth, Physiological and Biochemical Adaptations, Marine and Coastal Ecosystems, Fish Ecology and Management Studies, Aquatic Invertebrate Ecology and Behavior, Environmental Toxicology and Ecotoxicology, and Aquatic Ecosystems and Phytoplankton Dynamics.

Recent publications demonstrate a focus on environmental dynamics and aquatic organisms. Notable papers include:

  • Interplay of oxygen and light in the photo-oxidation of dissolved organic carbon (2021, Water Research)
  • Effects of natural light and depth on rates of photo-oxidation of dissolved organic carbon in a major black-water river, the Rio Negro, Brazil (2020, The Science of The Total Environment)

These papers address processes related to dissolved organic carbon and photochemical effects in aquatic environments. Although some recent works listing other authors were noted, Johannsson contributed to studies focusing directly on photo-oxidation and chemical interactions in water systems.

Frequent co-authors with whom Johannsson has conducted research include:

  • Chris M. Wood
  • Adalberto Luís Val
  • Anne Crémazy
  • M. S. Ferreira
  • Carolyn Morris

Their work has appeared in several publication venues, highlighting interdisciplinary aquatic and environmental science:

  • Journal of Fish Biology
  • Water Research
  • The Science of The Total Environment
  • Journal of Experimental Biology
  • Journal of Photochemistry and Photobiology

Multiple papers have addressed aquatic physiological processes and environmental effects on fish and aquatic ecosystems, supporting Johannsson's involvement in ecological and physiological adaptations research. The diversity of their publication record indicates work at the interface of environmental chemistry, aquatic biology, and ecosystem dynamics.

Best Publications

  • Lake Ontario: food web dynamics in a changing ecosystem (1970-2000)

    E L Mills;J M Casselman;R Dermott;J D Fitzsimons

  • Large nonlethal effects of an invasive invertebrate predator on zooplankton population growth rate.

    Kevin L. Pangle;Scott D. Peacor;Scott D. Peacor;Ora E. Johannsson

  • Benthic and Pelagic Secondary Production in Lake Erie after the Invasion of Dreissena spp. with Implications for Fish Production

    Ora E. Johannsson;Ron Dermott;Donna M. Graham;Julie A. Dahl

  • Changes in the Nearshore and Offshore Zooplankton Communities in Lake Ontario: 1981–88

    Ora E. Johannsson;Edward L. Mills;Robert O'Gorman

  • Diet of Mysis relicta in Lake Ontario as revealed by stable isotope and gut content analysis

    Ora E Johannsson;Mike F Leggett;Lars G Rudstam;Mark R Servos

  • Tribute to R. G. Boutilier: the effect of size on the physiological and behavioural responses of oscar, Astronotus ocellatus, to hypoxia.

    Katherine A. Sloman;Chris M. Wood;Graham R. Scott;Sylvia Wood

  • Temporal and Seasonal Trends in Nutrient Dynamics and Biomass Measures in Lakes Michigan and Ontario in Response to Phosphorus Control

    T. H. Johengen;Ora E. Johannsson;G. Laird Pernie;E. S. Millard

  • Assessing the impact of a recent predatory invader: The population dynamics, vertical distribution, and potential prey of Cercopagis pengoi in Lake Ontario

    Hugues P. BenoÍt;Ora E. Johannsson;David M. Warner;W. Gary Sprules

  • Effect of lake-wide planktivory by the pelagic prey fish community in Lakes Michigan and Ontario

    Peter S. Rand;Donald J. Stewart;Brian F. Lantry;Lars G. Rudstam

  • Mysis relicta: Assessment of Metalimnetic Feeding and Implications for Competition with Fish in Lakes Ontario and Michigan

    Ora E. Johannsson;Lars G. Rudstam;David C. Lasenby

  • Temperature-dependent allometric models to estimate zooplankton production in temperate freshwater lakes

    Jason D. Stockwell;Ora E. Johannsson

  • Biogeochemical influences on the carbon isotope signatures of Lake Ontario biota

    M F Leggett;M R Servos;R Hesslein;O Johannsson

  • The effects of silver on intestinal ion and acid-base regulation in the marine teleost fish, Parophrys vetulus.

    M. Grosell;G. De Boeck;O. Johannsson;C.M. Wood

  • The effects of temperature and predator—prey interactions on the migration behavior and vertical distribution of Mysis relicta

    Brent T. Boscarino;Lars G. Rudstam;Shylene Mata;Gideon Gal

  • Life History and Productivity of Mysis Relicta in Lake Ontario

    Ora Johannsson

  • Roles of Predation, Food, and Temperature in Structuring the Epilimnetic Zooplankton Populations in Lake Ontario, 1981–1986

    Ora E. Johannsson;Robert O'Gorman

  • Filtering Impacts of an Introduced Bivalve (Dreissena polymorpha) in a Shallow Lake: Application of a Hydrodynamic Model

    Hugh J. MacIsaac;Ora E. Johannsson;Jian Ye;W. Gary Sprules

  • Response of Mysis relicta population dynamics and productivity to spatial and seasonal gradients in Lake Ontario

    Ora E. Johannsson

  • Spatial and long-term temporal assessment of Lake Ontario water clarity, nutrients, chlorophyll a, and zooplankton

    Kristen T. Holeck;James M. Watkins;Edward L. Mills;Ora Johannsson

  • Phytoplankton photosynthesis at two index stations in Lake Ontario 1987-1992 : assessment of the long-term response to phosphorus control

    E S Millard;D D Myles;O E Johannsson;K M Ralph

  • Influence of inorganic nitrogen cycling on the δ15N of Lake Ontario biota

    M F Leggett;O Johannsson;R Hesslein;D G Dixon

Frequent Co-Authors

Chris M. Wood
Chris M. Wood University of British Columbia
Lars G. Rudstam
Lars G. Rudstam Cornell University
Edward L. Mills
Edward L. Mills Cornell University
Adalberto Luis Val
Adalberto Luis Val National Institute of Amazonian Research
Adalto Bianchini
Adalto Bianchini Federal University of Rio Grande
Michael T. Arts
Michael T. Arts Toronto Metropolitan University
W. Gary Sprules
W. Gary Sprules University of Toronto
William D. Taylor
William D. Taylor University of Waterloo
Scott D. Peacor
Scott D. Peacor Michigan State University
David R. Mount
David R. Mount Environmental Protection Agency

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