USA Today reports:
A final mystery surrounding the work of film legend Alfred Hitchcock— what triggered the crazed bird flocks that helped inspire his 1963 thriller The Birds— appears solved by scientists.
Dying and disoriented seabirds rammed themselves into homes across California’s Monterey Bay in the summer of 1961, sparking a long-standing mystery about the cause among marine biologists. The avian incidents sparked local visitor Hitchcock’s interest, along with a story about spooky bird behavior by British writer Daphne du Maurier.
“I am pretty convinced that the birds were poisoned,” says ocean environmentalist Sibel Bargu of Louisiana State University in Baton Rouge. She led a team finding that naturally occurring toxins appear to have been the culprit.
Call it the Case of the Poisoned Plankton. Looking at the stomach contents of turtles and seabirds gathered in 1961 Monterey Bay ship surveys, Bargu and colleagues have now found toxin-making algae were present in 79% of the plankton that the creatures ate. In particular, the team finds in the current Nature Geoscience journal that the leading toxin inside the plankton was a nerve-damaging acid, which causes confusion, seizures and death in birds.
Medical Xpress reports:
In a study to be published Sept. 1 in Nature, Stanford University School of Medicine scientists have found substances in the blood of old mice that makes young brains act older. These substances, whose levels rise with increasing age, appear to inhibit the brain’s ability to produce new nerve cells critical to memory and learning.
The findings raise the question of whether it might be possible to shield the brain from aging by eliminating or mitigating the effects of these apparently detrimental blood-borne substances, or perhaps by identifying other blood-borne substances that exert rejuvenating effects on the brain but whose levels decline with age…
The Nature article is available here (free preview, subscription required for full paper).
Discovery News reports:
Wild blonde capuchin [monkeys] have invented a new and tool-conserving method to fish for termites, researchers have just discovered.
The technique, reported in the latest Royal Society Biology Letters, has never been documented before for primates, including humans. In fact, people who recently tried out the new five-step termite fishing method found that it worked better than anything else at retrieving the nutritious, yet pesky, insects, which some human cultures eat too.
The BBC reports:
Monkeys trained to play computer games have helped to show that it is not just humans that feel self-doubt and uncertainty, a study says.
US-based scientists found that macaques will “pass” rather than risk choosing the wrong answer in a brainteaser task.
Awareness of our own thinking was believed to be a uniquely human trait.
But the study, presented at the AAAS meeting in Washington DC, suggests that our more primitive primate relatives are capable of such self-awareness.
Duke University’s Canine Cognition Center in Durham, North Carolina, is one of the few labs in the country focused on how dogs think.
“We’re excited about describing the psychology of our dogs,” says professor Brian Hare, the lab’s director. “Different dogs solve different problems differently. And what we want to understand is: What is it that either makes dogs remarkable as a species or what is it that constrains the ability of dogs to solve problems?”
Hare has been analyzing our four-legged friends for about 15 years. He says dogs have figured out how to read human behavior and human gestures better than any other species has, even chimpanzees.
“The way they think about their world is that people are superimportant and they can solve almost any problem if they rely on people,” says Hare.
Wired reports on the new field of optogentics. This research takes light-sensitive plant cells and implants them in animals, allowing light to activate specific neurons in a way not previously possible.