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Blobrana


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Megalodon
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Monster shark 'kept whales in check'

The extinction of the biggest shark known to science may have triggered whales to grow to their current hefty sizes, a study suggests.
Megalodon, an ancient 14-18m-long predator that resembled a super-sized Great White, may have preyed on primitive baleen whales.
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Blobrana


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RE: Great White Shark
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Great whites 'not evolved from megashark'

A new fossil discovery has helped quell 150 years of debate over the origin of great white sharks.
Carcharodon hubbelli, which has been described by US scientists, shows intermediate features between the present-day predators and smaller, prehistoric mako sharks.
The find supports the theory that great white sharks did not evolve from huge megatooth sharks.
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Blobrana


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Great white shark washes up on New England beach

A great white shark has washed up on a beach in Rhode Island. The animal was 13 ft long and weighed around 700kg.
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Blobrana


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Greenland sharks
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Slowest Greenland sharks hunts sleeping prey

Researchers have measured the swimming speed of the ocean's slowest shark.
Data-logging tags revealed that Greenland sharks "cruise" at 0.34m per second - less than 1mph.
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Blobrana


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Carcharodon carcharias
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Title: Population genetics of Australian white sharks reveals fine-scale spatial structure, transoceanic dispersal events and low effective population sizes
Authors: Dean C. Blower, John M. Pandolfi, Barry D. Bruce, Maria del C. Gomez-Cabrera, Jennifer R. Ovenden

Despite international protection of white sharks Carcharodon carcharias, important conservation parameters such as abundance, population structure and genetic diversity are largely unknown. The tissue of 97 predominately juvenile white sharks sampled from spatially distant eastern and southwestern Australian coastlines was sequenced for the mitochondrial DNA (mtDNA) control region and genotyped with 6 nuclear-encoded microsatellite loci. MtDNA population structure was found between the eastern and southwestern coasts (FST = 0.142, p < 0.0001), implying female reproductive philopatry.

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Blobrana


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Ampullae of Lorenzini
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  Shark attacks: A magnetic solution?

An American chemist says he's found a substance - several, in fact - that can repel some of the most fearsome predators in the ocean. He wants to use his discovery to protect them, and us.
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Blobrana


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Carcharocles megalodon
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Title: Ancient Nursery Area for the Extinct Giant Shark Megalodon from the Miocene of Panama
Authors: Catalina Pimiento, Dana J. Ehret, Bruce J. MacFadden, Gordon Hubbell

As we know from modern species, nursery areas are essential shark habitats for vulnerable young. Nurseries are typically highly productive, shallow-water habitats that are characterised by the presence of juveniles and neonates. It has been suggested that in these areas, sharks can find ample food resources and protection from predators. Based on the fossil record, we know that the extinct Carcharocles megalodon was the biggest shark that ever lived. Previous proposed paleo-nursery areas for this species were based on the anecdotal presence of juvenile fossil teeth accompanied by fossil marine mammals. We now present the first definitive evidence of ancient nurseries for C. megalodon from the late Miocene of Panama, about 10 million years ago.

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Blobrana


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RE: Great White Shark
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The fossilised remains of a gigantic 10m-long predatory shark have been unearthed in Kansas, US.
Scientists dug up a gigantic jawbone, teeth and scales belonging to the shark which lived 89 million years ago.
The bottom-dwelling predator had huge tooth plates, which it likely used to crush large shelled animals such as giant clams.
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Blobrana


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Sharks
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Florida Atlantic University researchers say they have determined the wide heads of hammerhead sharks give the animal exceptional stereo vision.
University researchers Michelle McComb, Stephen Kajiura and Timothy Tricas said they wanted to discover how wide a hammerhead's field of view is and whether they could have binocular vision.
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Blobrana


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RE: Great White Shark
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Great white sharks do not aimlessly wander the ocean waiting to stumble upon their next meal.
Instead, the biggest sharks identify a location from which to strike, and then search the surrounding killing zone for their next victim.
That suggests that the sharks use a premeditated hunting strategy akin to that used by some human serial killers.

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