Ptilochronology as a non-invasive tool for evaluating nutritional condition in a wild population of Griffon Vultures (Gyps fulvus) in La Rioja, Spain.

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Presentation transcript:

Ptilochronology as a non-invasive tool for evaluating nutritional condition in a wild population of Griffon Vultures (Gyps fulvus) in La Rioja, Spain Alvaro Camina Apartado de Correos 339, 28220 Majadahonda, Madrid, SPAIN Reuven Yosef International Birding & Research Center in Eilat, P. O. Box 774, Eilat 88000, ISRAEL

Chelo Atencia & Saturnino Moreno * Ignacio Gamez Carmona Centro de Recuperacion de fauna silvestre la fombera, gobierno de La Rioja * Marti Surroca Centro de Recuperacion Forn del Vidre C/Juan Ricart Miralles Vinaros * Jose Rafael Garrido Dept. Biodiversidad Animal, CES Marcelo Spinola-Univ. of Wales, Umbrete Chelo Atencia & Saturnino Moreno Centro de Recuperacion El Boticario FAADN Malaga

PTILOCHRONOLOGY (the study of feather time) Michener, H., & J. R. Michener. 1938. Bars in flight feathers. Condor 60:149-160. Grubb, T. C. Jr. 1989. Ptilochronology: feather growth bars as indicators of nutritional status. Auk 106:314-320.

Graceful Warbler Prinia gracilis Eilat, Israel 24 h growth Fault bars Optimal, consistent growth Irregular Sub-optimal

Griffon Vultures La Rioja, Spain 4 caged adults (3-4 yrs) 16 free-living adults 11 free-living sub-adults 63 fledglings mean width of 10 growth bars centered on 2/3 of the distance from the proximal end of the feather total length number of fault bars

Nutritional condition of Griffon Vultures in Spain 9.0+1.2 7.7+1.0 7.7+0.9 5.0+0.8 5.3+3.7 1.9+4.4 0+0 (N=4) (N=14) (N=25)

Nutritional condition of Griffon Vultures in Spain Nestlings significantly better nutritional condition than free-living adults (Wilcoxon signed rank test z = -2.197, P = 0.02) BUT not different from caged adults (z = -1.461, P = 0.14). Simple regression analyses no relationship between juvenile growth and faults bars (y = -0.024x + 2.13, r2 = 0.004) which is in contrast to adults (y = -2.165x + 17.77, r2 = 0.374).

CONCLUSIONS Free-living adults are the most adversely affected Parents buffer young from fluctuating food availability by supplying food even if not enough for themselves Ptilochronology can help evaluate the nutritional condition of wild populations of Griffon Vultures