No, really not!
Don't be a credulous sucker, the more as this shit can kill you!
Blog about "The World's best Shark Dive" by Beqa Adventure Divers. Featuring up to eight regular species of Sharks and over 400 different species of fish, Shark diving doesn't get any better!
Rubbish.
Never even heard of that journal. What's the point??? I don't get it. Ritter must be a lot smarter than me.
Since nearly 59% prefer to swim very near—less than 1 m—from the sea floor when approaching the test-subjects, we suggest that the ocean floor is used as a form of camouflage, allowing the sharks to better blend in, whereas a mid-water approach may make them more visible against the lighter background, illuminated by the sky. Approaching close to the bottom to reduce visibility reflects a typical stealth behavior.
Such an observation could imply that sharks might categorize humans as a potential form of prey. However, if the shark’s idiosphere does indeed reflect a flight initiation distance, then humans can rather be categorized as some form of predator. Nevertheless, there is also the possibility that sharks assume humans to be neither a prey nor a predator and simply accept them as unfamiliar objects. It, therefore, remains unclear whether and how humans are categorized by sharks, but considering the low yearly incident rates between sharks and humans, there must be some factors that hold sharks back from biting more frequently during encounters with humans.
Five of the putative parthenogens were heterozygous at one or two loci (involving Ppe-8 and Ppe-114), which demonstrates that they are diploid. This indicates that they were most likely produced by automictic parthenogenesis with the heterozygous loci being close to the telomere and undergoing recombination prior to fusion of the ovum and the sister polar body.
Critically endangered ocean giant is reproducing without sex in the wildAbout 3 percent of smalltooth sawfish from Florida estuary are products of “virgin birth.”STONY BROOK, NY, (Embargoed until 12 NOON ET on June 1, 2015) –Are males truly essential for reproduction?Female birds, reptiles and sharks living in captivity have sometimes surprised their keepers by giving birth even though, as far as anyone can remember, they have never been housed with a male. Scientists used DNA analysis to solve this mystery some time ago, showing that these offspring were produced by asexual reproduction, a process called parthenogenesis, or “virgin birth.” Although these events have captured tremendous public interest, it was unknown if this ever occurred in wild populations of these animals.Scientists at Stony Brook University, Florida Fish and Wildlife Conservation Commission, and The Field Museum have discovered that around 3 percent of the sawfish living in a Florida estuary are apparently the products of this type of reproduction, the first evidence of this in the wild for any vertebrate animal. These outwardly normal “parthenogens” live alongside other sawfish produced through normal sexual reproduction, suggesting that occasional virgin births may be more common in natural populations than ever suspected. The discovery, reported in a paper entitled “Facultative parthenogenesis in a critically endangered wild vertebrate” is published in the June 1, 2015 issue of the Cell Press journal Current Biology.The smalltooth sawfish (Pristis pectinata) is one of five species of sawfish, a group of large rays known for their long, tooth-studded rostrum that is used to subdue small fish.Sawfish may be the first entire family of marine animals to become extinct because they are all critically endangered as a result of overfishing and coastal habitat loss. The race is on to save this species, which has disappeared from most of the places in the Atlantic where it was common a century ago and is now listed as endangered under the U.S. Endangered Species Act.Today, smalltooth sawfish are mainly found in a handful of locations in southern Florida, including the Caloosahatchee and Peace rivers. It was here that scientists have discovered that these critically endangered ocean giants are sometimes breeding without sex. “We were conducting routine DNA fingerprinting of the sawfish found in this area in order to see if relatives were often reproducing with relatives because of their small population size,” said the study’s lead author, Andrew Fields, a Ph.D. candidate at the Stony Brook University’s School of Marine and Atmospheric Science. “What the DNA fingerprints told us was altogether more surprising; female sawfish are sometimes reproducing without even mating.”
Parthenogenesis is common in invertebrates but relatively rare in vertebrates.
Among the birds, reptiles, sharks, and now rays, parthenogenesis is thought to be triggered by an unfertilized egg absorbing a sister cell called the polar body that is nearly genetically identical to the egg. This results in an offspring that has roughly half the genetic diversity of its mother. In many cases these offspring are malformed or die early. “There was a general feeling that vertebrate parthenogenesis was a curiosity that didn’t usually lead to viable offspring,” said Dr. Gregg Poulakis of the Florida Fish and Wildlife Conservation Commission, who led field collections of the sawfish. “The seven parthenogens we found looked to be in perfect health and were normal size for their age. This suggests parthenogenesis is not a reproductive dead end, assuming they grow to maturity and reproduce.” The parthenogen sawfish were all tagged and released back into the wild as part of an ongoing study of sawfish biology and ecology.The researchers are now encouraging others conducting similar studies to take a few moments to screen their DNA databases from other animals to see if there are hidden parthenogens living in other wild populations. “This could rewrite the biology textbooks,” said Dr. Kevin Feldheim of the Pritzker Laboratory at The Field Museum in Chicago, where the DNA fingerprinting was conducted. “Occasional parthenogenesis may be much more routine in the wild than previously thought.”The research team speculates that since smalltooth sawfish are so rare, females might sometimes fail to find a male during the mating season, inducing the parthenogenetic process. “It is possible that parthenogenesis is most often expressed in wild vertebrates when the population is at very low levels and the animals have difficulty finding one another,” said Fields. “Parthenogenesis could help endangered species like sawfish dodge extinction for a little while, but it should also serve as a wake up call that we need serious global efforts to save these animals.”For more information on the plight of sawfish and efforts to save them see here.
It stopped actually being "about sharks" a long time ago.
It's about the individual and what the sharks as a vehicle to notoriety can do for them.
One of the main counter-arguments I hear from scienceyness advocates is, “Not everyone has the time or expertise to read original journal papers; isn’t it better that we support from the sidelines than not at all?”I’m not saying you have to read the original journal paper.I’m not saying you have to understand all the technical jargon.
I’m saying that you need to take ten goddamn seconds to run a Google search and determine whether the story is legitimate, untrue, or just plain blown out of all proportion to the actual evidence.Here’s the litmus test:Before you click that “Share” button, ask yourself why you’re sharing the story. Is it because you’re genuinely interested in the project? Or is it because you think the headline and the picture look cool? Or is it — be really honest — because you want your friends to think of you as a smart person who’s plugged into the latest research news?There’s nothing inherently wrong with the second two motivations — as long as they’re backed up by the first one.
Shark attacks around the world are generally on the rise, thanks to shark conservation efforts that began in the early 1990s combined with increasing numbers of people enjoying saltwater recreation.
"So let's look at the real problems, which is this loophole of encouraging fishers to get back their hooks when they catch sharks... that loophole that allows them to bring it on board, kill it and throw it back and not count it."
FWC enforcement officers in the Keys are aware of the nocturnal shark-fishing activity at Sea Oats Beach and pay special attention to it during the shark pupping season, agency spokesman Officer Bobby Dube said.
"Fishermen are allowed to catch sharks," Dube said. "Finning is illegal but catching sharks is not."