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| Content Provider | Springer Nature Link |
|---|---|
| Author | Paradis, Yves Bertolo, Andrea Magnan, Pierre |
| Copyright Year | 2008 |
| Abstract | The frequency of individuals with empty stomachs (FES) can vary greatly among northern pike populations. However, the FES has only seldom been analyzed in this species and its meaning is still not fully understood. It has been suggested that a high FES may reflect a strongly piscivorous behaviour while low FES could reflect a higher utilization of invertebrates. We compared the stomach contents and the trophic position of northern pike in 16 populations of individuals feeding mainly on fish or benthic invertebrates. We tested the hypothesis that northern pike with empty stomachs or with fish in their stomachs have a higher trophic position than individuals feeding on invertebrates. Carbon (δ13C) and nitrogen (δ15N) stable isotope signatures were used to estimate the trophic position of individuals. We found no significant difference in the trophic position among piscivores, invertebrate feeders, and northern pike with empty stomachs. The average trophic position of northern pike was high (mean ± SD = 4.3 ± 0.4, n = 66) and was correlated with total length. These results indicate that, although invertebrates could be an important part of the diet of northern pike in Canadian Shield lakes, fish are still the dominant prey. Hence, feeding on invertebrates in our study lakes would reflect an opportunistic rather than a specialized feeding strategy. |
| Starting Page | 441 |
| Ending Page | 448 |
| Page Count | 8 |
| File Format | |
| ISSN | 03781909 |
| Journal | Environmental Biology of Fishes |
| Volume Number | 83 |
| Issue Number | 4 |
| e-ISSN | 15735133 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2008-05-30 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Invertebrates Piscivory Diet Trophic position Stomach contents Nature Conservation Environment Animal Systematics/Taxonomy/Biogeography Zoology Freshwater & Marine Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Aquatic Science Ecology, Evolution, Behavior and Systematics |
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