EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 9:15 AM - 9:30 AM | Nutrients, neonics and predators: lessons learned after a decade of mesocosm experiments. | 305B
Nutrients, neonics and predators: lessons learned after a decade of mesocosm experiments.
The ecological effects of neonicotinoid insecticides, or ‘neonics’, on field-collected, aquatic insect community structure and function were evaluated in a series of experiments that began in 2003. These experiments occurred in flow-through, outdoor mesocosms and investigated i) the effects of neonics in pulse/press study designs, ii) the potential for nutrient additions to attenuate pesticide effects, iii) the effect of neonics on food webs (e.g., predator-prey interactions), and iv) how neonic toxicity is affected by the presence of other pesticides. Mesocosms are particularly useful for interdisciplinary research and enable the teasing apart of confounding factors such as the interaction between nutrients and mixtures of contaminants to reveal underlying patterns of aquatic communities. Moreover, this mesocosm research has highlighted the limitations of our understanding of pesticide effects on stream invertebrates (e.g., effects of low concentrations of neonics on body size) by unveiling both the complexity and simplicity of relationships between organisms and the environment. How best to deploy these systems to incorporate the spatial and temporal variation of real streams and some common design issues (e.g., open vs. closed systems, pseudoreplication) will be discussed.
- C13 Ecotoxicology
- C03 Invertebrates
- S25 Do mesocosm experiments play a meaningful role in freshwater research
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Presenters/Authors
Alexa Alexander
(), Environment and Climate Change Canada, alexa.alexander-trusiak@canada.ca;
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Joseph M. Culp
(), Environment and Climate Change Canada and Canadian Rivers Institute, Department of Biology, Wilfrid Laurier University, Waterloo, Ontario, Canada, N2L 3C5, joseph.culp@canada.ca;
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Donald Baird
(), Environment and Climate Change Canada @ Canadian Rivers Institute, Department of Biology, University of New Brunswick, Fredericton, NB, Canada, djbaird@unb.ca;
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Allan Cessna
(), Agriculture Agri-Foods Canada, allan.cessna@agr.gc.ca ;
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