Subscribe free to our newsletters via your
. Earth Science News .




Subscribe free to our newsletters via your




















WATER WORLD
Australian scientists say shark cull could wreck marine ecosystems
by Brooks Hays
Washington DC (UPI) May 8, 2017


Scientists are speaking out against a proposed shark cull in Australia. Killing large numbers of sharks won't limit shark attacks and could severely damage marine ecosystems, researchers argue.

"If there is a lack of sharks, then fish and other ocean creatures that would otherwise be consumed by sharks will become too numerous and eat too many smaller creatures and so on, meaning that the whole ecosystem changes massively," Robert Day, a marine biologist at the University of Melbourne, said in a news release.

Because sharks often target weak or sick prey, they protect fish species' gene pool and curb the spread of disease. Sharks also scavenge, which keeps ocean waters clear of rotting carcasses.

Even when not actively feeding, sharks' presence helps protect habitats. Grazers don't graze as ravenously when sharks are nearby, which ensures sea grasses and kelp forests aren't mowed down.

A number of studies have made the ecological benefits offered by large predators increasingly clear. But there is little to no scientific evidence showing shark culls work to reduce attacks.

Shark culls can have devastating effects on shark populations. Many shark species are already vulnerable or endangered.

"It doesn't take too much fishing to make their populations unsustainable," Day said.

Most sharks aren't prolific reproducers. Offspring are produced slowly. Because fishermen often catch the youngest sharks, a cull can quickly shrink a local shark population.

Australia's senate is currently considering a cull as one option for curbing shark attacks on the country's beaches.

WATER WORLD
Decades of data on world's oceans reveal a troubling oxygen decline
Atlanta GA (SPX) May 08, 2017
A new analysis of decades of data on oceans across the globe has revealed that the amount of dissolved oxygen contained in the water - an important measure of ocean health - has been declining for more than 20 years. Researchers at Georgia Institute of Technology looked at a historic dataset of ocean information stretching back more than 50 years and searched for long term trends and patte ... read more

Related Links
Water News - Science, Technology and Politics

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

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

WATER WORLD
Marine Le Pen: far-right firebrand who has shaken up French politics

New fiber-based sensor could quickly detect structural problems in bridges and dams

20 sentenced to prison for deadly 2015 China landslide

Affluent countries contribute less to wildlife conservation than the rest of the world

WATER WORLD
Researchers develop eco-friendly 4-in-1 catalyst

Fabrication technology in the fourth dimension

First result from Jefferson Lab's upgraded CEBAF opens door to exploring universal glue

Researchers develop recycling for carbon fiber composites

WATER WORLD
New method can selectively remove micropollutants from water

Puerto Rico drinking water is worst in US: report

Lake water recharged by atmospheric precipitation in the Badain Jaran Desert

Australian scientists say shark cull could wreck marine ecosystems

WATER WORLD
Montana's glaciers are disappearing

Russia and climate change follow Tillerson to Arctic

Scientists find rare 'dragon skin' ice in Antarctica

Satellites track Antarctic ice loss over decades

WATER WORLD
Tillage farming damaging earthworm populations

Syngenta shareholders accept ChemChina offer

Conservation agriculture offers tired soil remedies

Can edible insects help curb global warming?

WATER WORLD
Canada's army rolls in after devastating floods

Strong quake hits southern Japan, no tsunami risk

Earthquake kills eight in western China: report

Climate change, tornadoes and mobile homes: A dangerous mix

WATER WORLD
Former rebels block entrance to I. Coast's second city

Army to protect Tunisia economy from protests: president

UN chief condemns attack that killed four peacekeepers in C. Africa

Mozambique's opposition extends truce indefinitely

WATER WORLD
Modern DNA reveals ancient origins of Indian population

Homo naledi's surprisingly young age opens up more questions on where we come from

Population growth, spread responsible for human advancement

Brazil's indigenous leader Raoni: youths losing their culture




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