Lag times for ivory originating in East Africa are shorter, on average, than the lag times for ivory originating in the Tridom region (Cameroon–Gabon–Congo). 90%) was derived from animals that had died less than 3 y before ivory was confiscated.
This indicates that the assumption of recent elephant death for mortality estimates of African elephants is correct: Very little “old” ivory is included in large ivory shipments from Africa.
The bomb curve has a “rising” and a “falling” limb: rapidly increasing in the late 1950s, peaking in the early 1960s with the crest in the SH occurring after that in the NH, then gradually diminishing to the current F.
19), one with the outer dentine on the rising limb (between 19) and the inner dentine on the falling limb (between 1965 and the present), and one entirely on the falling limb (both after 1965).
Savanna elephants have also experienced massive population declines, particularly in Tanzania and northern Mozambique.
Forest elephants are particularly vulnerable to poaching because of their slow population growth rates compared with their savanna counterparts (6).Carbon-14 is an important tool in understanding patterns of movement of illegal wildlife products.The illegal trade in elephant ivory has increased significantly in the past decade (1, 2), with studies estimating the current rate of decline of regional African elephant populations to be as high as 8%, primarily due to poaching (3, 4).For ivory entirely on the rising limb, the innermost dentine should have a higher FC value than the outermost dentine; data from Table S2 show that this is not the case.For the second case, the outermost dentine would have formed between 19 and the innermost dentine would have formed in the last decade, giving unreasonably slow growth rates for ivory ( All tusks with multiple samples are on the falling limb of the bomb curve, and we thus assume that all other specimens analyzed in this study are on the falling limb.