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390 news posts in Life sciences

Life sciences

11 Jun 2024

How older people explore new spaces could suggest cognitive decline and dementia

Aging people commonly show a decline in navigation ability, and this has generally been attributed to worsening spatial memory. But now, researchers from the US have shown for the first time that this decline is partly driven by changes in typical exploration behavior by middle age. In a maze learning task, middle-aged people were less efficient explorers than young people. This discovery could have applications in the clinical diagnosis and therapy of cognitive decline and dementia.

USNM 23792, Mammuthus primigenius, or Woolly Mammoth (composite), Department of Paleobiology, Smithsonian Institution. Photo by Gary Mulcahey.

Life sciences

31 May 2024

Clues to mysterious disappearance of North America’s large mammals 50,000 years ago found within ancient bone collagen

Dr Mariya Antonosyan, Dr Torben Rick, and Prof Nicole Boivin are co-authors of a new Frontiers in Mammal Science article in which they used new methods to identify fossil bone fragments housed at the Smithsonian’s National Museum of Natural History. The insights they gained could help scientists better understand the causes and consequences of large mammal extinction.

Newborns whose mother spoke in a mix of languages during pregnancy are more sensitive to a range of sound pitches

Life sciences

22 May 2024

Babies in the womb exposed to two languages hear speech differently when born

Researchers have shown for the first time that newborns of monolingual mothers respond differently to playback of a carefully selected sound stimulus than newborns of bilingual mothers. The findings suggest that bilingual newborns are sensitive to a wider range of acoustic variation of speech, at the cost of being less selectively tuned in to any single language. These results underscore the importance of prenatal exposure for learning about speech.

Male chicks play more than females. Image credit: Rebecca Oscarsson

Life sciences

02 May 2024

Why do male chicks play more than females? Study finds answers in distant ancestor

Researchers observed the frequency of play by aged chicks between six and 53 days old. Males engaged more frequently in social and object play than females, but there was no difference in the frequency of locomotor play. The researchers concluded that these patterns can be explained by the strong sexual dimorphism of adult junglefowl, the ancestors of domestic chickens. This means that male chicks benefit more from practicing skills related to physical ability and social tactics.

The caterpillar of another species of moth, the yellow-striped oakworm (Anisota peigleri). Image credit: Konstantin Kornev

Life sciences

27 Mar 2024

Scientists discover how caterpillars can stop their bleeding in seconds

Materials scientists have now shown how the blood-like hemolymph of tobacco hornworm caterpillars forms clots to stop bleeding. They show that outside the body, hemolymph can instantaneously change from water-like behavior to become ‘viscoelastic’ like saliva, that is, combining viscosity with elasticity. This discovery could have medical applications, if drugs can be designed that induce a similar change in human blood, to make it clot faster.

A Hylaeus navai female from Viti Levu, Fiji. Image credit: James Dorey Photography

Life sciences

26 Feb 2024

How did a tiny bee get to French Polynesia? Eight new species help solve a scientific mystery

Scientists discovered eight new species of masked bee in Fiji, Micronesia, and Polynesia: relatives of Tuamotu’s masked bee from Tuamotu. For 59 years, this bee had been considered by experts to be a mysterious anomaly since its closest relatives, as far as was known at the time, lived 3,000 km further west. With the new species, discovered by sampling from the tree canopy, the mystery is solved: ancestors of Tuamotu’s masked bee reached Polynesia by island-hopping across Fiji and the southwestern Pacific. Many more new species are expected to be discovered in the canopy of islands along this route soon.

The pink helmet jellyfish, a hydrozoan

Life sciences

14 Feb 2024

Tiny crustaceans discovered preying on live jellyfish during harsh Arctic night

Scientists used DNA metabarcoding to show for the first time that jellyfish are an important food for amphipods during the Arctic polar night in waters off Svalbard, at a time of year when other food resources are scarce. Amphipods were not only observed to feast on ‘jelly-falls’ of dead jellyfish, but also to prey on live jellyfish. These results corroborate an ongoing ‘paradigm shift’ which recognizes that jellyfish aren’t a trophic dead-end but an important food for many marine organisms.