Sentences with phrase «sand tiger sharks»
When the scientists recovered the tags from two male sand tiger sharks in 2013, the downloaded data told an unexpected story.
sciencedaily.com
In contrast, modern sand tiger sharks living today in the Atlantic Ocean are very intolerant of low salinity, requiring three times the saltiness of the Eocene sharks in order to survive.
«Through an analysis of fossil sand tiger shark teeth from the western Arctic Ocean, this study offers new evidence for a less salty Arctic Ocean during an ancient «greenhouse period,»» says Yusheng «Chris» Liu, program director in the NSF's Division of Earth Sciences, which co-funded the research with NSF's Division of Polar Programs.
The findings, published in the Nature journal Scientific Reports, could help researchers in future efforts to improve the life cycle of sand tiger sharks.
Sibling rivalry takes a deadly turn with sand tiger sharks.
Researchers gathered this data by using a novel tagging procedure to collect tens of thousands of interactions between 300 or so tagged sand tiger sharks along the Eastern Seaboard.
In the past, his group has scanned gars, an eel, a bowhead whale fetus, and even a 2.5 - meter bigeye sand tiger shark (which didn't completely fit inside the scanner).
The study indicates the Eocene Arctic sand tiger shark, a member of the lamniform group of sharks that includes today's great white, thresher and mako sharks, was thriving in the brackish water of the western Arctic Ocean back then.
In addition to encountering over 50 percent of all the other tagged sand tiger sharks on the East Coast, the sand tigers came in contact with Atlantic sturgeons, white sharks, sand bar and spiny dogfish sharks, and even southern species like the lemon shark and bull shark.
According to National Geographic, Bradley M. Wetherbee, who studies shark behavior and ecology at the University of Rhode Island, is conducting a Delaware - based study on what happens to sand tiger sharks when they are caught and released.
The salinity gradient across the Eocene Arctic Ocean that provided habitat for the ancient sand tiger sharks also was found to be much larger than the salinity gradient tolerated by modern sand tiger sharks living in the Atlantic Ocean, said Eberle.
Sand tiger sharks are a vulnerable species due to their inherently low reproduction rates (they produce only 1 - 2 pups every other year) and historic overfishing.
The team analyzed 30 fossil sand tiger shark teeth exhumed from Banks Island and 19 modern sand tiger shark teeth from specimens caught in Delaware Bay bordered by Delaware and New Jersey.
The paleo - salinity estimate for the modern sand tiger sharks is consistent with the continental shelf salinity present from Delaware south to Florida and from the coastline to roughly six miles offshore, known hunting grounds for modern sand tiger sharks, which have formidable teeth and can reach a length of nearly 10 feet.
«If we only studied them in the Delaware Bay, we would think the sand tiger shark population is always mixed, with male and female juveniles and adults together throughout the year.
The project began in summer 2012, when UD researchers tagged 20 sand tiger sharks with implanted acoustic transceivers to study their interactions and movements.
«The ancient sand tiger sharks that lived in the Arctic during the Eocene were very different than sand tiger sharks living in the Atlantic Ocean today.»
Rima Jabado, a PhD student at United Arab Emirates University, was contacted by a fisherman who found an unusual looking shark, which resulted in the first scientific record of a sand tiger shark in United Arab Emirates waters.
Pet stingrays as they glide past you in the touch tank, or dive in and snorkle or scuba alongside giant groupers, Moray eels, guitar fish, sand tiger sharks and green sea turtles.
Sand tiger sharks are fierce even before they're born; in the womb the sharks fight their siblings, consume them for nourishment, and only the strongest of the brood survives to hit the open water.