Analyzing shark teeth hints that the two ocean hunters competed for food.
long . This giant began menacing the oceans around 23 million years ago. When — and why — it went extinct isn’t clear. The species may have lingered until about 2.6 million years ago. Or it may have vanishedTo figure out if the two sharks dined on similar food, the researchers turned to zinc, which has two main forms: zinc-66 and zinc-64. The relative abundances of those isotopes, preserved in tooth enamel, can indicate an animal’s position in a food web.
Still, that the sharks consumed similar prey isn’t proof they were in competition, the researchers say. And there are many . Those factors include ocean circulation changes, collapsing prey populations and competition for food with other ocean creatures, like orcas.
Österreich Neuesten Nachrichten, Österreich Schlagzeilen
Similar News:Sie können auch ähnliche Nachrichten wie diese lesen, die wir aus anderen Nachrichtenquellen gesammelt haben.
Full-service restaurant chains bring barbecue to the great indoorsBlack Angus, Golden Corral and Norms are among the chains with meaty menu additions.
Weiterlesen »
Rolex worn by prisoner during WWII 'Great Escape' up for auctionRolex watch worn by a British prisoner during the real-life 'Great Escape' from the Nazi Stalag Luft III concentration camp is set to go on sale in New York
Weiterlesen »
Great Lakes cruises return, with stops in ClevelandGreat Lakes cruising has returned to the Port of Cleveland with the first ships dropping anchor in Northeast Ohio last month.
Weiterlesen »
Great Outfits in Fashion History: Garcelle Beauvais Pulling Off Nighttime Sunglasses in 1999This look is all about the tinted lenses — then and now.
Weiterlesen »
Ohio State Great Nick Mangold Selected for New York Jets Ring of HonorFormer Ohio State center Nick Mangold, who made seven Pro Bowls in 11 seasons with the New York Jets, will be inducted into the Jets’ Ring of Honor this fall.
Weiterlesen »