Researchers were sequencing DNA from a collection of hundreds of bones excavated years before in Southeast Alaska by researchers including Timothy Heaton, PhD, professor of earth sciences at the University of South Dakota when they discovered a dog bone. Charlotte Lindqvist, an evolutionary biologist from University at Buffalo, was studying how Ice Age climatic changes impacted animals’ survival and movements in Southeast Alaska.

Lindqvist originally thought that the bone was from a bear but quickly realized that it was a dog bone. This gave them evidence about early human migration through that area and possibly how dogs first arrived in America.

Researchers analyzed the dog’s mitochondrial genome and concluded that the animal belonged to a lineage of dogs whose evolutionary history diverged from that of Siberian dogs as early as 16,700 years ago.

This discovery showed the the dog had a marine diet and supports the hypothesis that the first dog and human migration occurred through the Northwest Pacific coastal route.

Journal Reference:

1. Flavio Augusto da Silva Coelho, Stephanie Gill, Crystal M. Tomlin, Timothy H. Heaton, Charlotte Lindqvist. An early dog from southeast Alaska supports a coastal route for the first dog migration into the Americas. Proceedings of the Royal Society B: Biological Sciences, 2021; 288 (1945): 20203103 DOI: 10.1098/rspb.2020.3103

Cite This Page:

University at Buffalo. “How did dogs get to the Americas? An ancient bone fragment holds clues.” ScienceDaily. ScienceDaily, 23 February 2021. <www.sciencedaily.com/releases/2021/02/210223192442.htm>.