| Food I | Food II | Food III | Food name | Country | Predator Stage |
|---|---|---|---|---|---|
| plants | other plants | terrestrial plants | plant materials | Canada | juv./adults |
| zoobenthos | insects | insects | aquatic insects | (not available) | juv./adults |
| zoobenthos | insects | insects | insects larvae | Canada | juv./adults |
| zooplankton | fish (early stages) | fish eggs/larvae | fish eggs | Canada | juv./adults |