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Nocturnal in Biological News

When every photon counts

... is available in German . The eyes of nocturnal mammals contain particularly large numbers of the ... Laboratory Cambridge have now shown that the nocturnal lifestyle and its visual challenges had a unique ... With this unique arrangement, the rod nuclei of nocturnal mammals act as micro-lenses that focus the ...

Texas A&M anthropologist discovers long-lost primate in Indonesia

... graduate students, Nanda Grow, and a team of locals trapped three of the nocturnal creatures in Indonesia in late August. The pygmy tarsiers possess fingers ... of 7,000 to 8,000 above sea level proved tricky to navigate, and the nocturnal nature of the animals added another element of danger. "It was always ...

Otters reveal their identity

... witness the following morning to the otters feeding habits. Since these nocturnal and dawn-active animals are particularly demanding to their habitat, Lutra ... method has helped us considerably in finding out more about this majestic nocturnal swimmer in the ponds of the Lausitz. ...

Migrating squid drove evolution of sonar in whales and dolphins, researchers argue

... of convergent evolution to take advantage of unexploited food resources: nocturnal insects, in the case of non-migrating insectivorous bats, and nocturnal cephalopods, in the case of whales. And just as predominately migrating ...

Venomous sea snakes play heads or tails with their predators

... deadly venom. Apart from the Yellow-lipped Sea Krait the ecology of sea snakes has largely gone understudied, due mainly to their off-shore and nocturnal behaviour. Yet, despite the number of behavioural studies devoted to this species, the discovery of this false-head-behaviour is a hitherto ...

Wildlife Conservation Society supports world's first study of egg-laying mammal

... their dens and other signs. The study, published in a recent of the Journal of Mammalogy , chronicles the first solid data on the animal's nocturnal foraging behaviors, movement patterns, and home-range sizes for the species. The long-beaked echidna is found only in New Guinea and is a member ...

First jaguar photo taken at Smithsonian Research Station in Panama

... forest," said William Laurance, staff scientist at the Institute. The Willis' began using camera traps in 1994 as a tool to record elusive and nocturnal species. This proved exceptionally helpful in gathering data about species that were poorly represented in their past censuses of the island. A ...

Aussie meat ants may be invasive cane toad's Achilles' heel

... cane toads opt to live in open microhabitats and are active during the day, patterns that match those of meat ants. By contrast, native frogs are nocturnal and are safely ensconced in vegetation or other shelters during the day, when meat ants are on the hunt. Cane toads are also less well equipped to ...

Single gene lets bacteria jump from host to host

... from disease." In the Pacific, a species of bacteria known as Vibrio fischeri lives in luminescent harmony with two distinct hosts: the diminutive nocturnal bobtail squid and the reef-dwelling pinecone fish. In the squid, which feeds at night near the ocean surface, one strain of the bacterium forms a ...

Study sheds new light on dolphin coordination during predation

... Foundation and the Office of Naval Research. Much of the knowledge about spinner dolphin feeding has been anecdotal because they are primarily nocturnal in their feeding, Benoit-Bird pointed out. However, acoustical eavesdropping allowed the scientists to "view" the dolphins' behavior without ...

Migratory moths may hitch their rides, but they're anything but drifters

... He calls the two studies a "big advance in the field of insect migration," noting that there had been no conclusive evidence for a compass sense in nocturnal moths used to guide their migrations. A similar mechanism had been discovered in butterflies that fly low to the ground during the day, he added, but ...

Lightweight and long-legged males go the distance for sex

... Finding a mate can take considerable legwork as recently illustrated by the flightless and nocturnal Cook Strait giant weta Deinacrida rugosa. This cricket relative is found in New Zealand and is one of the world's heaviest insects with females ...

Feats of strength begin a lizard's day

... at daybreak and for about two hours afterward, and again just before dark. Anoles leave their daytime perches at night to find safe shelter from nocturnal predators. Scientists disagree on why birds chorus at dawn and dusk: competing ideas range from territorial defense to manifestations of circadian ...

Let the cat keep chasing the mouse

... still threatened by the destruction and fragmentation of its habitat as well as through interbreeding with the domestic cat. Furthermore, their long nocturnal wanderings often mean that they become victims of increased road traffic. German and Spanish researchers from the Helmholtz Center for ...

A bee's future as queen or worker may rest with parasitic fly

... Strange things are happening in the lowland tropical forests of Panama and Costa Rica. A tiny parasitic fly is affecting the social behavior of a nocturnal bee, helping to determine which individuals become queens and which become workers. The finding by researchers from the University of Washington ...

Do birds have a good sense of smell?

... are at the tip of the bill. When kiwis probe the forest floor in search of food, they are guided by smell rather than sight. Indeed the snuffling, nocturnal kiwis are sometimes considered to be New Zealand's equivalent of a hedgehog! Besides the total number of OR genes, the researchers estimated which ...

Birds migrate together at night in dispersed flocks, new study indicates

... the first to confirm with statistical data what many ornithologists and observers had long suspected: Birds fly together in loose flocks during their nocturnal migration. Researchers have spent decades trying to determine how birds migrate at night, when most bird migration occurs. But nighttime tracking ...

'Early bird' project really gets the worm

... on the ocean or open seas) evolved several times. For example, contrary to conventional thinking, colorful, daytime hummingbirds evolved from drab nocturnal nightjars; falcons are not closely related to hawks and eagles; and tropicbirds (white, swift-flying ocean birds) are not closely related to pelicans ...

Killer whales, blind bats, discriminating dolphins, mating birds

... in order to map the patterns of bird calls as a function of time and location. His presentation will show that acoustic data results from vocal nocturnal migrants correspond with the more traditional methods of bird banding and ground observations and can be an effective and complimentary method of ...

Female concave-eared frogs draw mates with ultrasonic calls

... frogs also emit a call that spans audible and ultrasonic frequencies. The team has not observed females vocalizing in the wild (these frogs are nocturnal and can leap up to 30 times their body length), but in laboratory settings the females emitted calls only when they were carrying eggs. Male O. ...

Lemurs' evolutionary history may shed light on our own

... primate species. Their analysis confirmed that the first to branch off from the rest of the lemurs, some 66 million years ago, was the aye-aye--a nocturnal primate that taps on trees with its fingers to listen for insects inside, making it Madagascars version of a woodpecker. They also resolved the ...

Accelerometer backpacks aid study of gliding behavior in the 'flying' lemur

... membrane, haul through the leaves and then open up and glide some more. Obstacles are not much of an issue for them." Its shyness, camouflage and nocturnal habits, however, make the colugo difficult to study, even though it lives comfortably in forested areas of big cities like Singapore. Laboratory ...

Researchers studying how singing bats communicate

... COLLEGE STATION, Oct. 18, 2007 Bats are the most vocal mammals other than humans, and understanding how they communicate during their nocturnal outings could lead to better treatments for human speech disorders, say researchers at Texas A&M University. Thousands of bats native to Central ...

Expecting an afternoon nap can reduce blood pressure

... for the lower cardiovascular mortality that some studies have found among people who habitually take siestas. On the other hand, some studies of nocturnal sleep have shown that blood pressure rises when we awake and that more cardiac deaths occur in the mornings. So the John Moores team will next look ...

Bats prey on nocturnally migrating songbirds

... into long-distance, north-south or south-north nocturnal movements. The danger seems especially acute ... stalking unwary songbirds during their massive nocturnal passes? The foraging habits of these rare bats ... at night; the forces of a skilled, almost silent nocturnal hunter patrolling the infinite dark space await ...

'Night owls' report more insomnia-related symptoms

... to insomnia, despite many having the opportunity to compensate for their nocturnal sleeplessness by extending their time in bed and being able to gain more ... Composite Scale. Group comparisons were made on self-report measures of nocturnal sleep, sleep period variability and waking correlates and consequences of ...

Negative effects of caffeine are stronger on daytime sleep than on nocturnal sleep

... de Montréal. "We already knew that caffeine has important effects on nocturnal sleep. It increases the time taken to fall asleep, it increases the amount ... prior to a daytime recovery sleep episode than in the evening before a nocturnal sleep episode." "Caffeine makes daytime sleep episodes too shallow ...

Does missing gene point to nocturnal existence for early mammals?

... and fits with the suggestion that early mammals were at one time wholly nocturnal creatures. "The classical view of how the eye sees is through ... why this might have happened ?perhaps the early mammals were at one stage nocturnal and had no need for the second gene, for instance. We also want to find ...

Plants tell caterpillars when it's safe to forage

... To test this hypothesis, Shiojiri et al. exposed larvae of a corn-munching nocturnal caterpillar, Mythimna separata , to volatile compounds from corn and ... demonstrate that it is not light that's controlling larval diurnal and nocturnal activity but volatiles released by the corn. Volatile compounds released ...

Ancient anthropoid origins discovered in Africa

... of the creatures appears to have been nocturnal, the first example of a nocturnal early anthropoid. The researchers published their discovery of the two ... indicating that it had to make room for the larger eyesocket of a nocturnal animal. "These finds seem to indicate that Biretia megalopsis must have ...

Discovery of an American salamander where it shouldn't be: Korea

... Plethodontidae have no lungs and breathe through moist skin. Because these nocturnal animals live, breed and lay their eggs on land, they typically are found ... there still are a lot of surprises to come in, especially with respect to nocturnal organisms that do not have breeding congregations, where they don't come ...

Old memory traces in brain may trigger chronic pain

... their physical pain. While the physical pain appeared to be reduced 30 percent – their emotional suffering completely disappeared. Rat are nocturnal animals that prefer to be in the dark and are averse to bright light. Researchers placed the rats in a two-compartment chamber –- one side light, one ...

To sleep, perchance to dream: New insight into melatonin production

... the transcript, through binding of another protein, called hnRNP Q. In fact, siRNA knock-down of hnRNP Q reduced AANAT and melatonin production under nocturnal conditions. ...

In young mice, gregariousness seems to reside in the genes

... the UW School of Medicine and Public Health and the senior author of the new study. Performing under the dim glow of red lights to simulate the nocturnal environment when mice are most active, the sociability of test mice was assessed when they were reunited with their former cage mates. At the same ...

Male owls pitch their hoots to advertise body weight to competitors

... (France) and the University of Sussex (UK) have studied the vocal communication of male European Scops owls, one of the smallest living species of nocturnal raptors. The study, published in the April issue of the American Naturalist, was conducted between June 2003 and June 2005 on the isle of Oléron, off ...

Tracking sperm whales and jumbo squid

... alter their diving pattern at night. Instead, they continued to spend about three-fourths of their time at depths of 600 to 1,300 feet, according to nocturnal tagging data. "These data show that sperm whales don’t change their feeding behavior, day or night," Davis explained. "Instead, they keep going ...

Scripps research team discovers a chemical pathway that causes mice to overeat and gain weight

... of temperature and motor activity, the researchers realized that the mice without the EP3 receptors were more active during the light hours-the nocturnal mice's "night"-and, more importantly, were eating during this time. The increased activity led to higher body temperatures, but this did not burn ...

Chimpanzees found to use tools to hunt mammalian prey

... motions in an apparent effort to obtain lesser bushbabies (Galago senegalensis) from cavities in hollow branches or tree trunks. Bushbabies are nocturnal prosimians that retire to such hidden cavities during the day. Although there was only one successful attempt in 22 recorded instances of the ...

To elude bats, a moth keeps its hearing in tune

... It has been known for over 50 years that moths can hear the ultrasonic hunting calls of their nocturnal predator, the bat. Moth ears are among the simplest in the insect world—they have only two or four vibration-sensitive neurons attached to a small ...
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