Subscribe to our free daily newsletters
. Earth Science News .




Subscribe to our free daily newsletters



WATER WORLD
Squids on the rise as oceans change
by Staff Writers
Adelaide, Australia (SPX) May 24, 2016


Giant Australian cuttlefish (Sepia apama), Spencer Gulf, South Australia. Image courtesy David Wiltshire. For a larger version of this image please go here.

Unlike the declining populations of many fish species, the number of cephalopods (octopus, cuttlefish and squid) has increased in the world's oceans over the past 60 years, a University of Adelaide study has found. The international team, led by researchers from the University's Environment Institute, compiled a global database of cephalopod catch rates to investigate long-term trends in abundance, published in Cell Press journal Current Biology.

"Our analyses showed that cephalopod abundance has increased since the 1950s, a result that was remarkably consistent across three distinct groups," says lead author Dr Zoe Doubleday, Research Fellow in the Environment Institute and School of Biological Sciences.

"Cephalopods are often called 'weeds of the sea' as they have a unique set of biological traits, including rapid growth, short lifespans and flexible development. These allow them to adapt to changing environmental conditions (such as temperature) more quickly than many other marine species, which suggests that they may be benefiting from a changing ocean environment."

Dr Doubleday says the research stemmed from an investigation of declining numbers of the iconic Giant Australian cuttlefish.

"There has been a lot of concern over declining numbers of the iconic Giant Australian cuttlefish at the world-renowned breeding ground in South Australia's Spencer Gulf," Dr Doubleday says. "To determine if similar patterns were occurring elsewhere, we compiled this global-scale database. Surprisingly, analyses revealed that cephalopods, as a whole, are in fact increasing; and since this study, cuttlefish numbers from this iconic population near Whyalla are luckily bouncing back."

Project leader Professor Bronwyn Gillanders says large-scale changes to the marine environment, brought about by human activities, may be driving the global increase in cephalopods.

"Cephalopods are an ecologically and commercially important group of invertebrates that are highly sensitive to changes in the environment," Professor Gillanders says. "We're currently investigating what may be causing them to proliferate - global warming and overfishing of fish species are two theories. It is a difficult, but important question to answer, as it may tell us an even bigger story about how human activities are changing the ocean."

Cephalopods are found in all marine habitats and, as well as being voracious predators, they are also an important source of food for many marine species, as well as humans. "As such, the increase in abundance has significant and complex implications for both the marine food web and us," says Dr Doubleday.


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
University of Adelaide
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
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
WATER WORLD
Parasite helps sea snails survive ocean acidification
Dunedin, New Zealand (UPI) May 18, 2016
For most species, a stressor like a parasitic infection compounds the threat of environmental change. But not for sea snails. Researchers at the University of Otago in New Zealand found sea snails infected by parasitic flatworms were better able to survive acidified seawater. The discovery was unexpected. Scientists were mostly interested in understanding the affects of pH levels ... read more


WATER WORLD
Orbita, a ghost of Chernobyl in the heart of Ukraine

Libya coastguard intercepts 850 migrants: navy

Artist Ai Weiwei says Gaza key part of refugee crisis

Belgian prisons 'like North Korea' as strike crisis hits

WATER WORLD
Combining nanotextures with Leidenfrost effect for water repellency

Printing metal in midair

Dynamic dazzle distorts speed

Scientists create 'rewritable magnetic charge ice'

WATER WORLD
Tiny ocean organism has big role in climate regulation

Parasite helps sea snails survive ocean acidification

New model could predict sudden shifts in river deltas

California eases water restrictions, but drought continues

WATER WORLD
Increased vegetation in the Arctic region may counteract global warming

Evidence of repeated rapid retreat of the East Antarctic ice sheet

Will more snow over Antarctica offset rising seas

Retreat of the ice followed by millennia of methane release

WATER WORLD
Genetically engineered crops: Experiences and prospects

EU delays re-approval for weedkiller glyphosate

Farms have become a major air-pollution source

Illinois River water quality improvement linked to more efficient corn production

WATER WORLD
Thousands homeless in cyclone-hit Bangladesh

Sri Lanka president flies to flood-hit area, toll hits 37

New study finds major earthquake

Sri Lanka flood toll hits 11, thousands more homeless

WATER WORLD
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

WATER WORLD
From Israel's army to Hollywood: the meteoric rise of Krav Maga

New evidence that humans settled in southeastern US far earlier than previously believed

Climate change may have contributed to extinction of Neanderthals

Drawing the genetic history of Ice Age Eurasian populations




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