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The ‘Near Threatened’ Bearded Screech-owlMegascops barbarus: diet pattern and trophic assessment using δ13C and δ15N stable-isotopes
| Content Provider | Scilit |
|---|---|
| Author | Enríquez, Paula L. Cheng, Kimberly M. Elliott, John E. |
| Copyright Year | 2009 |
| Description | Summary: The diet patterns and trophic relationships are poorly understood for most tropical owl species. We used stable isotopes of carbon $(δ^{13}$C) and nitrogen $(δ^{15}$N) in 24 feather samples of the rare, endemic, and ‘Near Threatened’ Bearded Screech-owlMegascops barbarusto determine the trophic level of their prey and evaluate whether diet patterns vary (1) among individuals, (2) spatially along the species's range in the highlands of Chiapas, Mexico, and (3) temporally during the short- and long-term. Our results indicated that there was diet variation among individuals during the period of feather growth and there was a high positive correlation between stable isotopes in body and rectrices. The stable isotopes showed significant temporal differences in $δ^{15}$N signature values, but not in $δ^{13}$C values, with no obviously interpretable temporal pattern. Spatially, values of $δ^{13}$C and $δ^{15}$N did not vary across all nine sampled locations. The observed lower $δ^{13}$C values suggested that this owl lives in humid forests. More long-term studies and spatial dietary and prey analysis will be necessary to increase our understanding of how habitat conditions determine the distribution, abundance and quality of food for the Bearded Screech-owl. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/07983F1A60A95415FCCE28A91B849025/S095927090999013Xa.pdf/div-class-title-the-near-threatened-bearded-screech-owl-span-class-italic-megascops-barbarus-span-diet-pattern-and-trophic-assessment-using-span-class-sup-13-span-c-and-span-class-sup-15-span-n-stable-isotopes-div.pdf |
| Ending Page | 33 |
| Page Count | 9 |
| Starting Page | 25 |
| ISSN | 09592709 |
| e-ISSN | 14740001 |
| DOI | 10.1017/s095927090999013x |
| Journal | Bird Conservation International |
| Issue Number | 1 |
| Volume Number | 20 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2010-03-01 |
| Access Restriction | Open |
| Subject Keyword | Bird Conservation International Stable Isotope |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecology Animal Science and Zoology Nature and Landscape Conservation |
