Male age structure influences females` mass change during rut in a polygynous ungulate : the reindeer ( Rangifer tarandus ). - Holand, O.; Weladji, R.B.; Røed, K.H.; Gjøstein, H.; Kumpula, J.; Gaillard, J.-M.; Smith, M.E.; Nieminen, M. (CCSD, 2006)