Tag: "fins" at biology news

Effort to control trade in great white sharks gets teeth from international community

...agement and monitoring of trade in jaws, teeth and fins from the world's largest predatory fish. Led by the governments of Madagascar and Australia, the proposal to list the great white shark on Appendix II--which will provide key data on trade and allow better management of the species--was approved by ...

Almost good enough to eat

...nsumption of fish and underwater creatures without fins or scales, among other dietary restrictions. Throughout the world in different cultures and religions, a variety of dietary restrictions exist. The origin of these rules is often debated. For Alpina Begossi, Natalia Hanazaki and Rossano Ramos (Univ...

Scientists advocate genomic sequencing of 'living fossil'

...ediate evolutionary stage in the transformation of fins to limbs. Lobe-finned relatives of the coelacanth underwent morphological alterations that enabled them to emerge from the sea and inhabit terrestrial environments. Both the coelacanth and the lungfish the only two living lobe-finned fishes are ...

Same mutation aided evolution in many fish species, Stanford study finds

...d that several species of stickleback lacking hind fins all shared an alteration in how a gene was turned on and off. The striking similarity is that in both studies evolution turned to the same genetic switch to work a visible change in the fish. However, in the fin study the group wasn't able to pinpoin...

PNAS highlights for the week of May 16 - 20

...fish cannot retract their gonopodia--modified anal fins through which males transfer sperm to females--and they often display or swing them during courtship. In laboratory experiments, females preferred to spend time with videos of males displaying digitally enlarged gonopodia rather than those with aver...

Otter adaptations: How do otters remain sleek and warm

...stinctively shaped to interlock, with wedge-shaped fins or petals fitting into wedge-shaped grooves between fins of adjacent hairs. Weisel and colleagues report their findings in the Canadian Journal of Zoology. ...

Satellite technology allows scientists to track warm sharks in cold polar seas

Electronic tags broadcasting from the dorsal fins of salmon sharks reveal that these top predators migrate from the glacial waters of Alaska to the warm seas off Hawaii, according to a new study in the journal Science. The salmon shark's ability to survive such a broad range of thermal conditions is...

Missing fossil link 'Dallasaurus' found

...ime researchers can clearly show mosasaurs evolved fins from limbs within the different lineages of mosasaurs. With the aid of computer science and SMU's visualization laboratory, Polcyn has been able to simulate what Dallasaurus looked like, and how, based on his skeletal remains, he would swim and move ...

Scientist uses dragonflies to better understand flight

...," said Wang. "Whether it's a fish which flips its fins or a bird, they're actually using the same principle. "The way paper or leaves fall, and how insects fly, may give us some ideas about why animals use these methods at all," she said....

Even fish don't swim well when they're young!

...ny fish larvae hatch without fully formed pectoral fins and all hatch without a swimbladder, so similar pr...argues. Hopefully Mller's findings about pectoral fins and swimbladders can be used to reduce fish mortality rates. "Fish breeding programs cannot offer th...

New Arctic fossils fill evolutionary gap between fish and limbed animals

...fin like the earliest limbed animals, but also has fins and scales like a fish. The new species, named Tiktaalik roseae, shows that the evolution from life in water to life on land happened gradually in fish living in shallow water. For about a century, scientists have been able to trace the broad outli...

Newly found species fills evolutionary gap between fish and land animals

...ell as fish-like features such as a primitive jaw, fins and scales. These fossils, found on Ellesmere Island in Arctic Canada, are the most compelling examples yet of an animal that was at the cusp of the fish-tetrapod transition. The new find is described in two related research articles highlighted on ...

New fossils fill the evolutionary gap between fish and land animals

...imals, called tetrapods. But the creature also has fins and scales like a fish. "This animal is both fish ...n." The back of the animal's skull, neck, ribs and fins "are particularly tetrapod-like while the snout, lower jaws, and scale-cover are similar to those se...

UF scientists discover evolutionary origin of fins, limbs

... fishes, not along the sides of the body where the fins that preceded human arms and legs sprouted, but at...This midline -- think of the dorsal, tail and anal fins of a fish - is where the genetic template to produce fins originated, about 100 million years before...

Cellular traffic backups implicated in skeletal malformations

...eletal abnormalities craniofacial defects, kinked fins and shortened body. The pathway affected by the crusher mutation is key to transporting proteins outside of the cell. All proteins are made in the endoplasmic reticulum (ER), a labyrinthine compartment just outside the cell's nucleus. Proteins are ...

Earth's most diverse marine life found off Indonesia's Papua Province

...h as the small epaulette shark that "walks" on its fins and colorful schools of reef fish populating abundant and healthy corals of all shapes and sizes. Threats from over-fishing with dynamite and cyanide, as well as deforestation and mining that degrade coastal waters, require immediate steps to prot...

Triple threat: World fin trade may harvest up to 73 million sharks per year

...-data study of sharks harvested for their valuable fins estimates as few as 26 million and as many as 73 m...ess dinners in Southeast Asia and the Pacific Rim, fins are the most valuable part of the shark, which typically are sliced off as the shark, sometimes stil...

West Australian fossil find rewrites land mammal evolution

...f the head but importantly also had muscular front fins with a well-formed humerus, ulna and radius the same bones are found in the human arm. "This new fossil proves that features of land-living tetrapods (four-legged vertebrates) evolved much earlier in their evolutionary history than previously thoug...

Starting over: Wnt reactivates dormant limb regeneration program

... excitatory agent, the ability to regenerate their fins was rescued, Belmonte says. Using an inhibitory agent on frogs before the regeneration-enabled developmental window closed resulted in loss of that ability, but treating them with the excitatory agent after they had lost their regenerative capacity ...

Science's breakthrough of the year -- The Poincar Theorem

...he discovery of a fossil fish with sturdy, jointed fins made a big splash in 2006. The fish is the closest known kin to limbed vertebrates and provides a window into how life left the oceans and ventured onto terra firma. The Science of Invisibility: Though it looks nothing like Harry Potters magical ca...

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(Date:10/14/2014)... scientists led by researchers at the University of ... Miami Miller School of Medicine (UMMSM) have identified ... bipolar (manic depressive) disorder, a breakthrough that could ... disorder, as well as depression and other related ... this week in Nature Molecular Psychiatry , ...
(Date:10/14/2014)... between 10 and 20 years to develop, providing ... intervention if detected early, which may be possible ... clinical researchers. , Dr Jeremy Humphris and ... Medical Research, analysed medical histories and tumour samples ... patients, operated on between 1994 and 20122. Roughly ...
(Date:10/14/2014)... from Stanford University School of Medicine have discovered a ... the activation of muscle stem cells. Cells use autophagy ... times of nutrient deprivation. The scientists report in ... is operational it also seems to assist in the ... stem cells emerge from a quiescent state there is ...
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