Brazil nuts
Demographic Threats to the Sustainability of Brazil Nut Exploitation (Carlos A. Peres et al. Science Volume 302, Number 5653, Issue of 19 Dec 2003, pp. 2112-2114.)
The Future of the Brazilian Amazon William F. Laurance et al. Science Volume 291, Number 5503, Issue of 19 Jan 2001, pp. 438-439)