Subscribe to our free daily newsletters
. Earth Science News .

Subscribe to our free daily newsletters

Study: Sharks have personalities
by Brooks Hays
Sydney (UPI) May 27, 2016

disclaimer: image is for illustration purposes only

For the first time, scientists have documented unique individual personalities in Port Jackson sharks, a nocturnal, egg-laying species of bullhead shark found along the coast of southern Australia.

Biologists from the Macquarie University observed measurable and consistent differences in the way individual Port Jackson sharks responded to various stressors and foreign environs.

They detailed these individual personality differences in the Journal of Fish Biology.

"Over the past few decades, personality research has shown that nearly 200 species of animals demonstrate individual personality," lead study author Evan Byrnes said in a news release. "Personality is no longer considered a strictly human characteristic, rather it is a characteristic deeply engrained in our evolutionary past."

Researchers introduced individual sharks to new habitat, measuring how quickly individual sharks emerged from the dens and into foreign territory. They also subjected each shark to handling stress and measured how quickly they recovered once released back into the water.

The sharks that best managed the stress of relocation also recovered the quickest from handling stress.

"We are excited about these results because they demonstrate that sharks are not just mindless machines," said Culum Brown, associate professor of biology at Macquarie. "Just like humans, each shark is an individual with its unique preferences and behaviors."

Researchers say their findings may have implications for wildlife managers and conservationists.

"If each shark is an individual and doing its own thing, then clearly managing shark populations is much more complicated than we previously thought," Brown said.

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only


Related Links
Water News - Science, Technology and Politics

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Previous Report
Europe's beaches getting cleaner: study
Copenhagen (AFP) May 25, 2016
Europe's beaches are getting cleaner and the vast majority of them last year met the EU's minimum requirements for water quality, according to a report released on Wednesday. The European Environment Agency (EEA) said that water quality at 96.1 percent of the 21,000 bathing spots covered by its 2015 bathing water survey was at acceptable levels, which was a rise of 0.9 percentage points from ... read more

Rescue drama all in a day's work for Italy's navy heroes

UN reaches out to China to build peacekeeping force

Sri Lanka appeals for up to $2 billion in foreign flood aid

The Lessons of Chernobyl and Fukushima

How solids dissolve in space may enable better tablets and pills on Earth

Clue for efficient usage of low-cost nickel catalysts

India's Indigenous IT: New Supercomputer to be Built in 2017

How the giant magnetoelectric effect occurs in bismuth ferrite

Thailand closes dive sites over coral bleaching crisis

Hongkongers pooh-pooh waste treatment plant, despite free spa

In changing oceans, cephalopods are booming

Inland waterways emit more CO2 than previously thought

Current atmospheric models underestimate the dirtiness of Arctic air

Northern invaders threaten Antarctic marine life

McDonald's in 'historic' agreement to contain Arctic cod fishing

Study Helps Explain Sea Ice Differences at Earth's Poles

Bayer-Monsanto tie-up fuels anti-GM debate in Germany

Study: Farm-raised salmon suffer from depression

New confidence in China wine market at Hong Kong's Vinexpo

Cambodia's royal oxen predict 'bountiful' harvest despite severe drought

Lava-loving tourists flock to active Nicaragua volcano

A warning system for tsunamis

Thousands homeless in cyclone-hit Bangladesh

Sri Lanka rain death toll hits 101 as waters recede

DR Congo denies getting pistols from North Korea

Senegal's child beggars show limits of 'apptivism'

S.Africa may re-consider regulated rhino horn trade in future

Climate-exodus expected in the Middle East and North Africa

Migration back to Africa took place during the Paleolithic

Did human-like intelligence evolve to care for helpless babies

Archaeologists say they've discovered Aristotle's tomb

French cave sheds new light on the Neanderthals

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement