Ora E. Johannsson

University of British Columbia — Canada

Environmental Science · Physical Sciences

34h-index3.6kcitations101works1.42yr avg
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Research Topics

Fish Ecology and Management Studies(66), Aquatic Invertebrate Ecology and Behavior(52), Aquatic Ecosystems and Phytoplankton Dynamics(37), Physiological and biochemical adaptations(16), Aquaculture Nutrition and Growth(12)

Publications101 total

Gill ionocytes of the Lake Magadi tilapia (Alcolapia grahami), an extremophilic teleost native to a highly alkaline environment
2026Open Access
Amazonian drought of 2023: Environmental conditions relevant to fishes
Journal of Fish Biology·2026Open Access
Joint effects of elevated copper and temperature in juvenile Tambaqui exposed in black and white waters of the Amazon
Journal of Fish Biology·2025· 2 citedOpen Access
The acute osmoregulatory effects of low <scp>pH</scp> and Cu, alone and in combination, on the dwarf cichlid (<scp><i>Apistogramma agassizii</i></scp>) in Rio Negro blackwater and Rio Solimões whitewater: Flux rates of ions, nitrogenous wastes and water
Journal of Fish Biology·2025· 2 cited
Climate change: temperature and oxygen impacts on the photooxidation of dissolved organic carbon (DOC)
Journal of Photochemistry and Photobiology·2025· 1 citedOpen Access
The effect of environmental factors on transepithelial potential in a model Amazonian teleost, the tambaqui (<scp><i>Colossoma macropomum</i></scp>): Implications for sodium balance in harsh environments
Journal of Fish Biology·2025· 3 citedOpen Access
Dissolved Organic Carbon (DOC) of the Rio Negro, Amazonia: Importance, Processes and Potential Anthropogenic Impacts
2024· 2 cited
Emersion and recovery alter oxygen consumption, ammonia and urea excretion, and oxidative stress parameters, but not diffusive water exchange or transepithelial potential in the green crab (<i>Carcinus maenas</i>)
Journal of Experimental Biology·2023Open Access
Changes in zooplankton biomass in the Bay of Quinte with the arrival of the Mussels, Dreissena polymorpha and D. rostiformis bugensis, and the predatory cladoceran, Cercopagis pengoi:
Michigan State University Press eBooks·2022· 1 cited
Larval Lake Whitefish abundance, diet and growth and their zooplankton prey abundance during a period of ecosystem change on the Bay of Quinte, Lake Ontario
Michigan State University Press eBooks·2022
A chronicle of nonindigenous species in the Bay of Quinte, Lake Ontario
Michigan State University Press eBooks·2022
(Canada) Photo-oxidation of Dissolved Organic Carbon: Studies from the Rio Negro
2021
Interplay of oxygen and light in the photo-oxidation of dissolved organic carbon
Water Research·2021· 20 cited
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
The Science of The Total Environment·2020· 12 citedOpen Access
Understanding the gastrointestinal physiology and responses to feeding in air‐breathing Anabantiform fishes
Journal of Fish Biology·2020· 15 citedOpen Access
Sizes, condition factors and sex ratios of the scattered populations of the small cichlid fish, Alcolapia grahami, that inhabits the lagoons and sites of Lake Magadi (Kenya), one of the most extreme aquatic habitat on Earth
Environmental Biology of Fishes·2019· 7 cited
Fasting in the ureotelic Lake Magadi tilapia, Alcolapia grahami, does not reduce its high metabolic demand, increasing its vulnerability to siltation events
Conservation Physiology·2019· 5 citedOpen Access
Does hypoxia or different rates of re-oxygenation after hypoxia induce an oxidative stress response in Cyphocharax abramoides (Kner 1858), a Characid fish of the Rio Negro?
Comparative Biochemistry and Physiology Part A Molecular & Integrative Physiology·2018· 45 cited
Stomach contents and stable isotopes analysis indicate Hemimysis anomala in Lake Ontario are broadly omnivorous
Journal of Great Lakes Research·2018· 15 cited
Investigating copper toxicity in the tropical fish cardinal tetra ( Paracheirodon axelrodi ) in natural Amazonian waters: Measurements, modeling, and reality
Aquatic Toxicology·2016· 40 cited
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Frequent Co-authors

Lars G. Rudstam(12), Chris M. Wood(10), Éric Millard(9), Edward L. Mills(8), Gideon Gal(8), Robert O’Gorman(8), Kristen T. Holeck(5), Adalberto Luís Val(5), Kelly L. Bowen(5), D D Myles(4), Harold L. Bergman(4), James A. Hoyle(3), Brian F. Lantry(3), Ted Schaner(3), M F Leggett(3), Mark R. Servos(3), David M. Warner(3), William D. Taylor(3), Michael T. Arts(3), Adalto Bianchini(3)