Table 3 % Marine-derived nitrogen (MDN) estimates in invertebrates collected above and below waterfall barriers to salmon migration on the Clatse and Neekas Rivers, British Columbia. Estimates of % MDN were made under conditions of no fractionation from the source and maximum fractionation of 4‰ from the source nitrogen by primary producers.
| Â | Clatse River | |
|---|---|---|
Invertebrate family(ies) | % MDN (No Fractionation) | %MDN (Max Fractionation) |
Curculionidae | 49.1% | 71.5% |
Parajulidae | 19.4% | 28.2% |
Carabidae | 30.6% | 44.6% |
Agelenidae/Antrodiaetidae | 30.4% | 44.3% |
| Â | Neekas River | |
Invertebrate family(ies) | %MDN (No Fractionation) | %MDN (Max Fractionation) |
Parajulidae | 45.8% | 62.3% |
Carabidae | 34.8% | 47.3% |
Agelenidae/Antrodiaetidae | 51.2% | 69.6% |