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Tag: "fins" at biology news

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 pinpoi...

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. ...

Genome Sequence for Haemophilus Influenzae Completed

...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. ...

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...

Fossil find: 'Godzilla' crocodile had head of a dinosaur, fins like a fish

...s andiniensis lived entirely in the water, and had fins instead of legs. But that's not all that made it unusual. Two other features ?its hefty size and T. rex-like snout ?have earned it a unique place in history ?and the nickname “Godzilla.?/p> Diego Pol, a postdoctoral researcher at the Mathematical...

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...gues. Hopefully Müller's findings about pectoral fins and swimbladders can be used to reduce fish mortality rates. "Fish breeding programs cannot offer th...

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...

How does a zebrafish grow a new tail?

...a signaling also promotes the regeneration of tail fins in zebrafish. Another, distinct signaling pathway activated by a different kind of Wnt protein called Wnt5b, turns down the genes that are turned on by Wnt/Beta-catenin, impairs cell proliferation, and inhibits fin regeneration. Fish that have a muta...

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 thou...

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 ...

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...

Overfishing large sharks impacts entire marine ecosystem, shrinks shellfish supply

...des to meet the growing worldwide demand for shark fins and meat." Sharks are targeted in numerous fisheries, and they also are snagged as bycatch in fisheries targeting tunas and swordfish in both U.S. and high seas fisheries. As many as 73 million sharks are killed worldwide each year for the finni...

The price of vanity: Mating with showy males may reduce offspring's ability to fight off pathogens

...wy traits ?such as bright colors or long tails and fins ?results in higher testosterone levels in males over many generations. Because male and female testosterone levels are correlated, female choice also results in an increase in female testosterone levels. Testosterone is an immune suppressor, and ...

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