Estimates of whale population size based on genetics versus² historical records diverge³ greatly, making it difficult to fully⁴ understand the ecological⁵ implications of the large-scale commercial whaling of the 19th and early 20th centuries, but a comparison of DNA⁶ samples from modern and prehistoric⁷ gray whales supports the idea that the population was substantially larger pre-whaling and saw a sharp, recent decrease that is consistent with whaling as the cause. The full results are reported May 9 in the open access journal PLoS ONE.

Previous estimates of pre-whaling population size in gray whales using historic records and census⁸ modeling suggest there used to be about 15,000 to 35,500 eastern Pacific gray whales. In contrast, estimates from genetic¹ data suggest a much higher original population size of about 78,000 to 116,000 individuals. This discrepancy⁹, though, could be explained by a pre-whaling decrease in population. The authors of the current study, led by Elizabeth Alter of City University of New York (York College), set out to test this hypothesis.

They isolated¹⁰ DNA from whale bones excavated¹¹ from archaeological sites, ranging from about 150 to 2,500 years old. By comparing these sequences with sequences from modern whales, they determined¹² that a severe decline in whale population occurred recently, suggesting that the original population size was indeed larger than estimated based on historical record and arguing against population decline caused by any pre-whaling forces.

"Retrieving¹³ DNA from ancient whales allows more direct insights into their population histories than using modern DNA alone. In this case, we were able to look at pre-whaling specimens¹⁴ of gray whales, and found that the genetic data are consistent with a sharp and recent bottleneck¹⁵ -- very likely the result of commercial whaling. As methods for retrieval（检索，恢复） and analysis of ancient DNA improve, we'll be able to increasingly refine population histories for heavily exploited species like whales."