Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




WATER WORLD
Tiny sea creatures are heading for extinction, and could take local fisheries with them
by Staff Writers
Melbourne, Australia (SPX) Oct 22, 2013


Calanoid copepods are a plankton species that are a vital food source for fish larvae and therefore important for all commercial fisheries. Photo credit: Paul Jones, Deakin University.

A species of one of the world's tiniest creatures, ocean plankton, is heading for extinction as it struggles to adapt to changes in sea temperature. And it may take local fisheries with it.

Research led by Deakin University (Warrnambool, Australia) and Swansea University (UK) has found that a species of cold water plankton in the North Atlantic, that is a vital food source for fish such as cod and hake, is in decline as the oceans warm. This will put pressure on the fisheries that rely on abundant supplies of these fish.

"There is overwhelming evidence that the oceans are warming and it will be the response of animals and plants to this warming that will shape how the oceans look in future years and the nature of global fisheries," explained Deakin's professor of marine science, Graeme Hays.

"We know that warm water species are expanding their ranges as warming occurs, and vice versa. What is not known is whether species are able to adapt to new temperatures. Will, for example, cold water species gradually adapt so they can withstand warming seas and not continually contract their ranges. From the results of our study, it is looking like the answer is no."

Answering the question of adaptation is not easy as it requires long-term observations spanning multiple generations. For this study, the research team examined a 50-year time series from the North Atlantic on the distribution and abundance of two very common but contrasting species of ocean plankton, Calanus helgolandicus that lives in warmer water and Calanus finmarchicus that lives in cold water. These crustaceans are vital food for fish and underpin many commercial fisheries in the North Atlantic region.

The researchers were surprised to find that the cold water C. finmarchicus has continued to contract its range over 50 years of warming.

"In other words, even over 50 generations (each plankton lives for one year or less) there is no evidence of adaptation to the warmer water," Professor Hays said.

"The consequences of this study are profound. It suggests that cold water plankton will continue to become scarcer as their ranges contract to the poles, and ultimately disappear. So certainly for these animals, thermal adaptation appears unlikely to limit the impact of climate change.

"C. finmarchicus is a key food source for fish such as cod and hake. So continued declines in abundance will have a negative impact on the long-term viability of cold water fisheries in the North Sea and other areas in the southern part of their range. At the same time the continued increase in abundance of the warm water plankton, C. helgolandicus, will likely play a role in the emergence of new fisheries for warm water species."

Professor Hays said that the impact of ocean warming was not confined to the North Atlantic region.

"Ocean warming is occurring globally and so these findings are likely to apply to other areas around the world including southern hemisphere locations such as Australia, South Africa and South America that support important fisheries dependant on plankton," Professor Hays said.

"Plankton recorders deployed in the southern hemisphere, for example as part of the Australian Continuous Plankton Recorder Project (a joint project of CSIRO Marine and Atmospheric Research and the Australian Antarctic Division), will continue to document these changes."

The results of the study will be published in the journal Global Change Biology.

.


Related Links
Deakin University
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




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





WATER WORLD
A bad break for fake pearls
Zurich, Switzerland (SPX) Oct 22, 2013
For a long time, it was thought impossible to isolate a pearl's genetic material. Now, a Swiss research team has achieved this elusive goal. Scientists Joana Meyer, from the ETH Institute of Integrative Biology group headed by Prof. Bruce McDonald, and Laurent Cartier of the Swiss Gemmological Institute (SSEF), under the direction of Michael Krzemnicki, succeeded for the first time in extr ... read more


WATER WORLD
Australia's political parties claim asylum seeker success

Groundwater radiation spikes at crippled Fukushima

Japan typhoon rescue effort goes into 2nd night

U.S. businesses warned against Sandy-like disasters

WATER WORLD
Students creating satellite with self-healing material

Out-of-fuel European satellite to come crashing down

Satellite's gravity-mapping mission is over: ESA

Electrically powered in a geostationary orbit

WATER WORLD
Tiny sea creatures are heading for extinction, and could take local fisheries with them

13 Vietnamese arrested in Philippines over sea turtles

Jellyfish energy consumption inspires robotic designs for Navy

Next-gen gene sequencing tech can identify invasive carp species in Chicago area waterways

WATER WORLD
Dutch take Russia to maritime court over Greenpeace ship

Glacial history affects shape and growth habit of alpine plants

Nobel laureates call on Putin to drop piracy charges against Greenpeace

Nobel winners urge Russia to drop Greenpeace piracy charges

WATER WORLD
Maths study of photosynthesis clears the path to developing new super-crops

Nitrate from fertilizer lingers in soil for decades: study

Urban soil quality and compost

Paraguay's Cartes vetoes grain export tax

WATER WORLD
Tropical storm Raymond heads toward Mexico's west coast

Death toll in Philippine quake nearing 200

Hundreds flee homes in typhoon-hit Japan island

Hurricane Raymond threatens Mexico coast

WATER WORLD
UN urges DR Congo to prosecute soldiers for rape in east

Angola frees 55 Congolese troops captured during incursion

Zimbabwe man jailed for 15 years for poisoning elephants

France to keep 2,000 troops in Mali until end of year

WATER WORLD
Genetics suggests early human relatives made impressive migrations

Young apes manage emotions like humans

1.8-million-year-old skull find creates debate over human origins

New theory of synapse formation in the brain




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal 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. 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