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18 September 2019Animals
Prehistoric and historic walrus skulls, tusks and bone fragments often wash ashore on the southern coast of Snæfellsnes peninsula in Iceland. Hilmar J. Malmquist
A unique subpopulation of ancient walrus in Iceland was likely hunted to extinction by Vikings shortly after arrival to the region, according to new research.
<p>Two subspecies of walrus (<a href="https://www.iucnredlist.org/species/15106/45228501" target="_blank"><em>Odobenus rosmarus</em></a>) occur throughout the <a href="http://www.ecowatch.com/tag/arctic">Arctic</a> in both Pacific and Atlantic waters, the latter having a population of around 30,000 individuals throughout northeastern Canada, Greenland and parts of Russia. However, walruses are no longer found in Iceland despite ancient skeletal remains and centuries-old written documents indicating they once thrived in the region.</p><p>An international team of scientists analyzed the prehistoric remains of walruses found within the region by extracting DNA and compared this information against modern walruses. They further conducted radiocarbon dating in coordination with a review of studies related to walruses in the region. They found that walruses had inhabited the area for thousands of years, but disappeared mid-14th century just five centuries after the Norse settlers arrived, reports <a href="https://www.newscientist.com/article/2216471-vikings-probably-hunted-icelands-walruses-to-extinction-for-ivory/" target="_blank">New Scientist</a>.</p>
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<p>"Our study provides one of the earliest examples of local extinction of a <a href="https://www.ecowatch.com/tag/marine-life">marine species</a> following human arrival and overexploitation. It further adds to the debate about the role of humans in the extinction of megafauna, supporting a growing body of evidence that wherever humans turn up, the local environment and ecosystem suffers," <a href="https://healthsciences.ku.dk/newsfaculty-news/2019/09/extinction-of-icelandic-walrus-coincides-with-norse-settlement/" target="_blank">said</a> Morten Tange Olsen, assistant professor at Globe Institute, University of Copenhagen.</p><p>Writing in the journal <a href="https://academic.oup.com/mbe/advance-article/doi/10.1093/molbev/msz196/5564176" target="_blank"><em>Molecular Biology and Evolution</em></a>, the researchers note that <a href="http://www.ecowatch.com/tag/ivory">ivory</a> from walrus tusk was a luxury good in high demand and was traded across the Viking Age and Medieval Europe as far as the Middle East and India. A 2018 study reported by <a href="https://www.nationalgeographic.com/science/2018/08/norse-greenland-walrus-ivory-news/" target="_blank">National Geographic</a> similarly found that Norse hunters had indeed established a steady ivory trade, but the source of the tusks and ivory remained a mystery.</p><p>The work highlights the impact of human arrival in "pristine" environments and provides one of the earliest examples of trade and human exploitation resulting in the extinction of a marine resource.</p><p>"We show that already in the Viking Age, more than 1000 years ago, commercial hunting, economic incentives and trade networks were of sufficient scale and intensity to result in significant, irreversible ecological impacts on the marine environment, potentially exacerbated by a warming climate and volcanism," explained lead author Xénia Keighley. "The reliance on marine mammal resources for both consumption and trade has so far been underestimated."</p><p>The lineage of Icelandic walruses also proved to be a genetically unique species that is distinct from historic and contemporary walrus populations now found in the North Atlantic. The subspecies had existed in western Iceland for about 7,500 years, which the authors say suggests a "stable, long-term presence" up until 1213 to 1330 AD. </p>
<blockquote class="twitter-tweet"><p lang="en" dir="ltr">Loss of Arctic Sea Ice Causes Earliest Pacific Walrus Haul Out Ever <a href="https://t.co/v7oWjBwNwo">https://t.co/v7oWjBwNwo</a> <a href="https://t.co/hRt7rnuP2m">pic.twitter.com/hRt7rnuP2m</a></p>— Svein T veitdal (@tveitdal) <a href="https://twitter.com/tveitdal/status/898558412279230465?ref_src=twsrc%5Etfw">August 18, 2017</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
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