| Local extinctions of native species may occur at the invading species' own trophic level or at different trophic levels. |
| These data sets often consist of biomarker responses covering all the levels of biological organization in a vast array of bioindicator organisms representing different trophic levels. |
| Ground beetles were divided into predatory and phytophagous trophic levels. |
| For both acute toxicity and chronic toxicity, a minimum of two species must be included to address different trophic levels. |
| This high interannual variability at the base of the food chain influences organisms at all trophic levels. |
| Those effects are exacerbated in piscivorous species, because of the tendency of PCBs to biomagnify at upper trophic levels. |
