Abstract
Click to increase image sizeClick to decrease image size ACKNOWLEDGMENTS P. Loubry (MNHN) took the photographs. We are much indebted to P. Baby, M. Benammi, S. Brusset, D. De Franceschi, and N. Espurt for their participation in field work. This research project was undertaken thanks to the IRD-Perupetro S.A. research agreement, and supported by IRD (UR 154), Devanlay Peru S.A., and the French INSU-CNRS programs DyETI and ECLIPSE II, headed by P. Baby and P.-O. Antoine, respectively. Constructive comments of E. Fitzgerald, an anonymous reviewer, and the editor J. Geisler considerably improved a previous version of this paper. The work of O. Lambert at the IRSNB is funded by a Return Grant of the Belgian Federal Science Policy Office. Handling editor: Jonathan Geisler.
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