1er CHAPITRE - African Wildlife Foundation
1er CHAPITRE - African Wildlife Foundation
1er CHAPITRE - African Wildlife Foundation
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LES DEFENSES<br />
chapitre -Encadré 18.1, Georgiadis 1990). D’un autre<br />
côté, le coût de l’analyse isotopique est très élevé,<br />
allant d’environ US$50/échantillon pour le carbone<br />
et nitrogène, à US$ 150/échantillon pour le plomb et<br />
le strontium (Koch & Behrensmeyer 1992). Van der<br />
Merwe (1993) à estimé qu’une base de données<br />
continentale de la composition isotopique de l’ivoire<br />
pourrait revenir à US$400.000, à condition que<br />
l’équipement nécessaire soit disponible. Pour inclure<br />
des oligo-éléments supplémentaires, les techniques<br />
microchimiques disponibles seront probablement trop<br />
chères pour un usage de routine (Wyckoff 1972).<br />
14.6 CONCLUSION<br />
Il est possible que les défenses des éléphants puissent<br />
fournir des informations utiles sur les individus et les<br />
populations. Elles peuvent nous donner divers<br />
renseignements dans des circonstances différentes et<br />
quelquefois elles sont la seule source d’information<br />
sur des éléphants marts. Des recherches<br />
supplémentaires doivent être faites pour se rendre<br />
compte de tout le potentiel des informations foumnies<br />
par les défenses. Il faut en mÍme temps, tenir compte<br />
du coût d’une telle recherche et de ses applications<br />
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