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Latest Demian Chapman Stories

Unborn Sand Tiger Sharks Cannibalize One Another To Become Sole Survivor
2013-05-01 15:25:41

Brett Smith for redOrbit.com - Your Universe Online In some sexually reproducing species, the competition between males to pass on their genetic material ends with conception. However, for sand tiger sharks that competition extends into the female´s uteri where baby sharks cannibalize one another until only one remains. According to a new study in Biology Letters, a female sand tiger shark typically mates with multiple males, but the results of in utero cannibalism could result in...

2011-04-29 08:15:00

Studies show that coastal sharks have "DNA zip codes" that can reveal where they were born; underscores potential of DNA testing to monitor fin trade STONY BROOK, N.Y., April 29, 2011 /PRNewswire-USNewswire/ -- An international team of scientists, led by the Institute for Ocean Conservation Science at Stony Brook University, has used DNA to determine that groups of dusky sharks (Carcharhinus obscurus) and copper sharks (Carcharhinus brachyurus) living in different coastal regions across...

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2011-04-28 06:35:00

An international team of scientists have used DNA to determine that groups of dusky sharks and copper sharks living in different coastal regions across the globe are in fact separate populations of each species. Both groups are heavily exploited for the shark fin trade, which claims tens of millions of animals every year to produce the Asian delicacy: shark fin soup. Many of these fish are declining rapidly as a result of pressures of fishing for their fins. The dusky shark is classified by...

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2009-12-01 07:50:00

These breakthrough findings provide strong evidence for enacting international trade protection for hammerhead sharks at the March 2010 CITES meeting in Qatar Millions of shark fins are sold at market each year to satisfy the demand for shark fin soup, a Chinese delicacy, but it has been impossible to pinpoint which sharks from which regions are most threatened by this trade. Now, groundbreaking new DNA research has, for the first time, traced scalloped hammerhead shark fins from the...

2009-08-24 15:07:44

Study May Prove Useful in Conservation Efforts for Over-Fished Sharks A long-term field and DNA study by the Institute for Ocean Conservation Science at Stony Brook University, University of Miami, Field Museum of Chicago and others has shown that young lemon sharks born at the Bimini islands, Bahamas, tend to stay near their coastal birthplace for many years. While shark research and conservation typically focuses on baby sharks confined to shallow habitats, or ocean-roaming adults, less is...

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2008-10-10 15:25:00

The second-known instance of "virgin birth" in a shark has been confirmed through DNA testing, scientists said. A pup carried by a female Atlantic blacktip shark named Tidbit in the Virginia Aquarium & Marine Science Center contained no genetic material from a male. Beth Firchau, the curator of fish at the Virginia Aquarium & Marine Science Center in Virginia Beach said Tidbit was born in the wild and lived there for eight years with no males of the same species. The first documented...


Word of the Day
tesla
  • The unit of magnetic flux density in the International System of Units, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second. It is equivalent to one weber per square meter.
This word is named for Nikola Tesla, the inventor, engineer, and futurist.