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Ecology and Evolution

D-Index
34
Citations
4350
World Ranking
7638
National Ranking
471

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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