Inbreeding may have killed off woolly rhino: study

Abnormalities from inbreeding and difficult pregnancy may have played a role in the mysterious extinction of the woolly rhino that roamed the Earth during the last Ice Age, a study suggests.
Researchers from the Naturalis Biodiversity Center in The Netherlands examined woolly rhino and modern rhino neck vertebrae from several European and American museum collections.
They noticed that the remains of woolly rhinos from the North Sea often possess a 'cervical' (neck) rib - in contrast to modern rhinoceros.
The study, published in the journal PeerJ, on the incidence of abnormal cervical vertebrae in woolly rhinos, strongly suggests a vulnerable condition in the species.

Given the considerable birth defects that are associated with this condition, the researchers argue that it is very possible that developmental abnormalities contributed towards the eventual extinction of these late Pleistocene rhinos.
In modern animals, the presence of a 'cervical rib' (a rib attached to a cervical vertebra) is an unusual event, and is cause for further investigation, researchers said.

Though the rib itself is relatively harmless, this condition is often associated with inbreeding and adverse environmental conditions during pregnancy.
Frietson Galis, one of the authors of the study, has previously found a remarkably high percentage of these neck ribs in the woolly mammoth.

"This aroused our curiosity to also check the woolly rhino, a species that, like the woolly mammoth lived during the late Pleistocene and similarly died out," said Alexandra van der Geer, one of the authors of the study.
"Our work now shows that there was indeed a problem in the woolly rhino population," van der Geer said.
The absence of cervical ribs in the modern sample is by no means evidence that rhino populations today are healthy. Museum collections are based on rhino specimens that were collected at least five decades ago, researchers said.
Rhinoceros numbers are dwindling extremely fast, especially the last two decades, resulting in near extinction for some species and the total extinction of the western black rhinoceros, they said.

"Our study suggests that monitoring the health of the vertebrae in rhinos has the potential to timely detect developmental errors that indicate the level of extinction risk," said Galis.