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" ... Analysis of the relationships between the mtDNA yielded a starlike haplotype network (Figure 2), which shows low levels of sequence divergence and a high frequency of unique mutations. This analysis reflects an 80% decline in overall genetic diversity (or unique haplotypes) from the historical population through the genetic bottleneck in 1987. Most of this genetic diversity was lost after 1900 (black = proportion of historic haplotypes, grey = proportion of post-genetic bottleneck haplotypes; figure 2), although there were so few museum samples from the 20th century that it is impossible to narrow down this estimate to a more precise date. ... "