Sea Life sharks help scientists probe mysteries of ancient seas

Oct 18, 2011

Sea Life Centre sharks are set to help University of Birmingham scientists unravel the mysteries of ancient seas. That will be the goal of a major research project announced as the centres prepare to host special Shark Weeks in October, to promote shark conservation.

Clues to marine over millions of years may be locked up in sharks’ teeth, researchers believe. Oxygen isotopes which are incorporated into sharks’ teeth as they develop can reveal the temperature of the seawater the shark lived in at the time.

Now a research team led by Dr Ivan Sansom, a Senior Lecturer in Palaeobiology at the University of Birmingham, hopes Sea Life centre sharks will establish whether this applies to all shark teeth or just certain species.

“That will validate the study of age-old fossil shark teeth as a technique to learn more about sea conditions in prehistoric times,” he said.

“Other work in the field has suggested that cooling waters were a factor in driving major evolutionary changes whilst warming waters led to extinctions.

“With the current evidence for warming oceans the evidence from the past suggests we are going to see a major extinction in our oceans.

“Reconstructing past climate systems using evidence such as that we hope to find in shark teeth may help us understand what happened in the past, and what may happen in the future.”

The initial research (funded by the EU’s Marie Curie Fellowship scheme) involving teeth collected from the bed of centre ocean tanks will take two years to complete.

Centres across Europe will collect discarded shark teeth from the beds of their ocean tanks and send them to Birmingham along with regular water samples from their shark tanks.

The Birmingham-based research may ultimately provide more clues as to what caused the extinction of major marine predators such as the Megalodon, a 60 foot long shark that suddenly disappeared after a 14-million year reign at the top of the ocean food chain.

Fossil remains show that it was once found almost worldwide, yet it vanished forever about 1.6 million years ago, and no-one really knows why although a cooling of the world’s oceans has been cited as one possible cause.

Dr Sansom added that the work with shark teeth might later be extended to include studying deposits in the ear-bones of a wide range of fish, which can also reveal details of water chemistry.

While Dr Sansom’s work could help in forecasting climatic impact on the oceans, the planned Shark Weeks will focus more on man’s impact and in particular on the world’s shark species.

Between 70 and 100 million sharks are killed annually as by-catch or to provide fins for shark fin soup. Many species are already teetering on the brink of oblivion, and Shark Weeks will feature a host of activities highlighting their plight and seeking to persuade visitors of the need to protect rather than persecute .

Explore further: Spain defends Canaries oil drilling plan

Provided by University of Birmingham

not rated yet
add to favorites email to friend print save as pdf

Related Stories

As sharks dwindle, new laws enacted

May 28, 2007

Shark fisheries in Mexico and throughout the world are dealing with proposed rules to curb shark hunting in the interest of preserving these predators.

Extinct giant shark nursery discovered in Panama

May 17, 2010

The six-foot-long babies of the world's biggest shark species, Carcharocles megalodon, frolicked in the warm shallow waters of an ancient shark nursery in what is now Panama, report paleontologists workin ...

Ocean's fiercest predators now vulnerable to extinction

Feb 17, 2008

The numbers of many large shark species have declined by more than half due to increased demand for shark fins and meat, recreational shark fisheries, as well as tuna and swordfish fisheries, where millions of sharks are ...

Bahamas bans shark fishing

Jul 05, 2011

The Bahamas on Tuesday announced a ban on shark fishing, becoming the latest country to protect the ancient sea predator which is considered at risk due to demand for its fins in Chinese cuisine.

Study: Oceans 70 percent shark-free

Feb 22, 2006

An international team of scientists says the absence of sharks from abyssal regions of the world's oceans may mean some species are in danger of extinction.

Recommended for you

Study shows no lead pollution in oilsands region

Oct 24, 2014

New research from a world-renowned soil and water expert at the University of Alberta reveals that there's no atmospheric lead pollution in Alberta's oilsands region—a finding that contradicts current scientific ...

User comments : 0