Plate Nº 76 · recorded October 10, 2026
Biology & EvolutionReported finding
Aurochs Went Extinct in Scandinavia Under Multiple Pressures at Once, DNA Shows
Ancient DNA shows Scandinavian aurochs declined under a genetic bottleneck, rising seas, hunting and habitat loss — not one single cause, Lund-led researchers report.
By James Calloway4 min read826 words
In brief
- Aurochs colonized Scandinavia 11,700 years ago after the last ice age.
- A population bottleneck during migration left Scandinavian aurochs with low genetic diversity.
- Flooding of the land bridge around 8,000 years ago fully isolated the Scandinavian population.
- Aurochs persisted in southern Sweden until at least 6,500 years ago; the species' last stand was in Poland in the 17th century.
- The study appears in The Holocene (2026), led by Lund University.
The aurochs, the wild ancestor of modern cattle, took roughly 8,000 years to vanish completely — its final population died out in Poland in the 17th century. But in Scandinavia, one of the first regions where the species disappeared, the decline began far earlier and, according to new genetic research, no single cause can explain it.
An international team led by Lund University analyzed ancient DNA and found that the Scandinavian aurochs disappeared under the combined weight of several stressors: shrinking genetic diversity, isolation from the mainland, intense human hunting and the loss of open habitat. The study appears in the journal The Holocene.
"These ancient case studies reveal long-term patterns — which species are most vulnerable, how ecosystems shift and transform over time and when and how human activity began shaping these environments," said Erika Rosengren, a doctoral student in historical osteology at Lund University and lead author of the paper.
What happened to the Scandinavian aurochs?
Aurochs (Bos primigenius) once roamed large parts of Europe, Asia and northern Africa. They began colonizing Scandinavia about 11,700 years ago, right after the end of the last ice age.
Humans drove the species' global extinction, yet the much earlier disappearance of aurochs from Scandinavia had remained an open question. The new genetic data now fill in part of that timeline:
- During their northward migration, the aurochs likely passed through a sharp population drop — a "population bottleneck" — which left the Scandinavian animals with lower genetic diversity.
- Contrary to earlier beliefs that the population became isolated around 10,000 years ago, the researchers found genetic evidence of continued contact with the main European population beyond that date.
- Complete isolation came only when the land bridge connecting Scandinavia to the European mainland flooded, roughly 8,000 years ago.
"I found it incredibly interesting to see how the genetic diversity of the aurochs decreased as you moved north from mainland Europe up through Jutland and then dropped further across Zealand and Scania. It's a textbook example of a bottleneck in evolutionary genetics," said Mikkel-Holger S. Sinding, associate professor at the University of Copenhagen and a senior author of the study.
How did isolation and hunting interact?
The flooding that created the Danish–Swedish straits about 8,000 years ago cut the Scandinavian population off from the rest of Europe at a critical moment. That period also saw what the researchers describe as intense human hunting.
The two pressures compounded each other. The Swedish aurochs population declined sharply, and on the Danish island of Zealand the species disappeared completely.
In southern Sweden, aurochs hung on in low numbers until at least 6,500 years ago. Their eventual disappearance from Sweden likely followed a change in habitat: the once-open landscapes that aurochs favored gave way to dense forests, a shift the researchers believe was detrimental to the species.
A population bottleneck, in plain terms, means a species passes through a period when so few individuals survive that the gene pool shrinks. Reduced genetic diversity typically leaves a population less able to adapt to disease, climate shifts or environmental change — a vulnerability that the isolated Scandinavian aurochs apparently carried into the pressures that followed.
Why does this matter for conservation today?
The study paints a more complicated picture of the extinction than the traditional single-cause narrative. The researchers conclude that the aurochs' Scandinavian demise resulted from the combined effects of genetic depletion, human pressure, habitat fragmentation and habitat degradation — several forces acting simultaneously rather than one decisive blow.
Rosengren argues that this historical case carries a direct lesson for modern wildlife management.
"Our results add nuance to our understanding of human impact on animal populations. They confirm that species rarely disappear because of a single factor. Conservation plans must therefore be comprehensive and consider multiple stressors at the same time. Our results support the need to establish ecological corridors for threatened wildlife, rather than isolated nature reserves," she said.
Ecological corridors are connected stretches of habitat that allow animals to move between populations. The logic follows directly from the aurochs story: once rising seas isolated the Scandinavian population, it lost the genetic replenishment that comes from contact with larger herds — a fate that isolated reserves could recreate for threatened species today.
What are the study's limits?
The findings rest on ancient DNA, which is often fragmentary and comes from a limited number of specimens, so the picture of population sizes and timing carries uncertainty. The conclusions about hunting intensity and forest encroachment in Scandinavia are also inferences drawn from genetic and archaeological evidence rather than direct observation. Still, the geographic pattern the team uncovered — diversity dropping step by step from mainland Europe through Jutland, Zealand and Scania — offers a unusually clear genetic signature of how the species moved and dwindled.
The publication is listed as Erika Rosengren et al., "The immigration history and extinction dynamics of the Scandinavian aurochs (Bos primigenius)," The Holocene (2026), DOI: 10.1177/09596836261477271.
via Phys.org Biology (Source)
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Staff writer covering marketplaces and e-commerce at SciBeat.
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