دورية أكاديمية
From video recordings to whisker stable isotopes: a critical evaluation of timescale in assessing individual foraging specialisation in Australian fur seals
| العنوان: | From video recordings to whisker stable isotopes: a critical evaluation of timescale in assessing individual foraging specialisation in Australian fur seals |
|---|---|
| المؤلفون: | Kernaleguen, Laëtitia, Dorville, Nicole, Ierodiaconou, Daniel, Hoskins, Andrew J., Baylis, Alastair M. M., Hindell, Mark A, Semmens, Jayson, Abernathy, Kyler, Marshall, Greg J., Cherel, Yves, Arnould, John P. Y. |
| المساهمون: | School of Life and Environmental Sciences, Deakin University Burwood, Institute for Marine and Antarctic Studies Horbat (IMAS), University of Tasmania Hobart, Australia (UTAS), National Geographic, Remote Imaging Department, Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| المصدر: | ISSN: 0029-8549. |
| بيانات النشر: | HAL CCSD Springer Verlag Springer-Verlag |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Vibrissae, Diet, Nested network, Time aggregating, Arctocephalus pusillus, [SDE]Environmental Sciences, geo, envir |
| الوصف: | International audience ; Estimating the degree of individual specialisationis likely to be sensitive to the methods used, as theyrecord individuals’ resource use over different time-periods.We combined animal-borne video cameras, GPS/TDRloggers and stable isotope values of plasma, red cells andsub-sampled whiskers to investigate individual foragingspecialisation in female Australian fur seals (Arctocephaluspusillus doriferus) over various timescales. Combiningthese methods enabled us to (1) provide quantitative informationon individuals’ diet, allowing the identification ofprey, (2) infer the temporal consistency of individual specialisation,and (3) assess how different methods and timescalesaffect our estimation of the degree of specialisation.Short-term inter-individual variation in diet was observedin the video data (mean pairwise overlap = 0.60), with thesampled population being composed of both generalist andspecialist individuals (nested network). However, the brevityof the temporal window is likely to artificially increase the level of specialisation by not recording the entire dietof seals. Indeed, the correlation in isotopic values wastighter between the red cells and whiskers (mid- to longtermforaging ecology) than between plasma and red cells(short- to mid-term) (R2 = 0.93–0.73 vs. 0.55–0.41). δ13Cand δ15N values of whiskers confirmed the temporal consistencyof individual specialisation. Variation in isotopicniche was consistent across seasons and years, indicatinglong-term habitat (WIC/TNW = 0.28) and dietary (WIC/TNW = 0.39) specialisation. The results also highlighttime-averaging issues (under-estimation of the degree ofspecialisation) when calculating individual specialisationindices over long time-periods, so that no single timescalemay provide a complete and accurate picture, emphasisingthe benefits of using complementary methods. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://hal.archives-ouvertes.fr/hal-01292489Test |
| الإتاحة: | https://doi.org/10.1007/s00442-015-3407-2Test https://hal.archives-ouvertes.fr/hal-01292489Test |
| حقوق: | undefined |
| رقم الانضمام: | edsbas.465D87E6 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |