Academics from the Archaeology Department at the University of York have discovered that North Atlantic right whale (Eubalaena glacialis) and Atlantic gray whale (Eschrichtius robustus) populations both inhabited the waters of the mediterranean two thousand years ago.
Up until now it was assumed that the Mediterranean Sea was outside of the historical range of the right and gray whale, however the discovery of whale bones in the ruins of a Roman fish processing factory located at the strait of Gibraltar has revealed that these species were once part of the Mediterranean marine ecosystem.
The study was an international collaboration between scientists at the universities of York, Montpellier (France), Cadiz (Spain), Oviedo (Spain) and the Centre for Fishery Studies in Asturias, Spain.
The team of researchers used ancient DNA barcoding and collagen fingerprinting methods to taxonomically identify this rare set of 10 whale bones, identifying three right whales, and three grey whales. Both species of whale are migratory, and their presence east of Gibraltar is a strong indication that they previously entered the Mediterranean Sea to give birth.
After centuries of whaling, the right whale currently occurs as a very threatened population off eastern North America and the gray whale has completely disappeared from the North Atlantic and is now restricted to the North Pacific.
Co-author of the study Dr Camilla Speller, from the University of York, said: “These new molecular methods are opening whole new windows into past ecosystems. Whales are often neglected in Archaeological studies, because their bones are frequently too fragmented to be identifiable by their shape.
“Our study shows that these two species were once part of the Mediterranean marine ecosystem and probably used the sheltered basin as a calving ground.
“The findings contribute to the debate on whether, alongside catching large fish such as tuna, the Romans had a form of whaling industry or if perhaps the bones are evidence of opportunistic scavenging from beached whales along the coast line.”
The Gibraltar region was at the centre of a massive fish-processing industry during Roman times, with products exported across the entire Roman Empire. The ruins of hundreds of factories with large salting tanks can still be seen today in the region.
Lead author of the study Dr Ana Rodrigues, from the French National Centre for Scientific Research, said: “Romans did not have the necessary technology to capture the types of large whales currently found in the Mediterranean, which are high-seas species. But right and gray whales and their calves would have come very close to shore, making them tempting targets for local fishermen.”
It is possible that both species could have been captured using small rowing boats and hand harpoons, methods used by medieval Basque whalers centuries later.
The knowledge that coastal whales were once present in the Mediterranean also sheds new light on ancient historical sources.
Anne Charpentier, lecturer at the University of Montpellier and co-author in the study, said: “We can finally understand a 1st-Century description by the famous Roman naturalist Pliny the Elder, of killer whales attacking whales and their new-born calves in the Cadiz bay.
“It doesn’t match anything that can be seen there today, but it fits perfectly with the ecology if right and gray whales used to be present.“
The study authors are now calling for historians and archaeologists to re-examine their material in the light of the knowledge that coastal whales where once part of the Mediterranean marine ecosystem.
Dr Rodriguez added: “It seems incredible that we could have lost and then forgotten two large whale species in a region as well-studied as the Mediterranean. It makes you wonder what else we have forgotten“.
Forgotten Mediterranean calving grounds of gray and North Atlantic right whales: evidence from Roman archaeological records is published in the journal Proceedings of the Royal Society of London B.
Proc. R. Soc. B 2018 285 20180961; DOI: 10.1098/rspb.2018.0961. Published 11 July 2018