Earth Science News  





.
WATER WORLD
The Pacific Oyster Is In Sweden To Stay

This is the Pacific oyster (Crassostrea gigas) in shallow water. Credit: Åsa Strand
by Staff Writers
Gothenburg, Sweden (SPX) Mar 25, 2011
The Pacific oyster was discovered in large numbers along the west coast of Sweden in 2007. The mortality rate in some places during the past two winters has been 100%, but researchers at the University of Gothenburg who have studied the Pacific oyster can now say that the species copes with cold winters and is here to stay.

The Pacific oyster has proved to be tolerant of low temperatures. Large populations of the oyster remained after the harsh winter of 2009/2010.

In 18 locations studied along the Bohuslan coast, the mortality rate ranged between 32% and 100%, and averaged 84%.

he survival rate for the oysters increased with increasing depth. Some oyster sites consequently still have large populations of living oysters.

"Pacific oysters that were exposed to low air temperatures by low water levels or were frozen in ice died during the first winter (this could refer to the winter 2007, change to the first of the two latest winters, or something similar?), while those that were beneath the ice coped well," says the researcher Åsa Strand of the Department of Marine Ecology at the University of Gothenburg.

This year's winter (December to February) was warmer than last year, and the water level was generally higher. No major mortality can therefore be expected this winter, as those oysters that would be in the risk zone already died last winter.

However, Pacific oysters born in 2010 are at great risk of dying during the winter if they have settled in shallow water.

Strand and her colleagues will therefore study morality after this year's winter at the end of May and beginning of June.

The fact that the Pacific oyster survived the winter of 2009/2010 means that it is, in all probability, here to stay.




Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
University of Gothenburg
Water News - Science, Technology and Politics



Tempur-Pedic Mattress Comparison

Newsletters :: SpaceDaily Express :: SpaceWar Express :: TerraDaily Express :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News
WATER WORLD
Ancient Trash Heaps Gave Rise To Everglades Tree Islands
Santa Fe NM (SPX) Mar 23, 2011
Garbage mounds left by prehistoric humans might have driven the formation of many of the Florida Everglades' tree islands, distinctive havens of exceptional ecological richness in the sprawling marsh that are threatened by human development. Tree islands are patches of relatively high and dry ground that dot the marshes of the Everglades. Typically a meter (3.3 feet) or so high, many of th ... read more

.
Get Our Free Newsletters Via Email
  


WATER WORLD
Rescuers struggle in quake-hit Myanmar

Tsunami batters Japan's tourism industry

US experts unsure about Fukushima situation

Japan's tsunami orphans face uncertain future

WATER WORLD
Japan says people should leave 30km nuke plant zone

Researchers Devise Model For Stronger Self-Healing Materials By Adding More Give

Cheap Catalyst Made Easy

Seeing In Stereo: Engineers Invent Lens For 3-D Microscope

WATER WORLD
The Pacific Oyster Is In Sweden To Stay

Developing Strategies In A Desert Watershed That Sustain Regional Water Supplies

Report Uncovers Key Trends In Water Resources Research

Iraqi Kurdistan building 11 dams, 28 more planned

WATER WORLD
Study: 2011 arctic ice extent is down

Wheels Up for Extensive Survey of Arctic Ice

Arctic-Wide Measurements Verify Rapid Ozone Depletion In Recent Days

Pace of polar ice melt 'accelerating rapidly': study

WATER WORLD
Egypt seeks food and water security in Sudan

Global food scare widens from Japan nuclear plant

Japan finds contaminated lettuce shipment

Tree Resin The Key Evidence Of Current And Historic Insect Invasions

WATER WORLD
Japan death toll tops 10,000: Kyodo

Over 25 killed in Myanmar quake: officials

Reactor fear at Japan plant as toll tops 10,000

Survivors struggle in remote Myanmar quake areas

WATER WORLD
Burkina Faso soldiers freed from prison after protests

Passions stirred, Gbagbo backers "ready to die" for I.Coast

African Union demands 'immediate' halt to Libya attacks

War clouds gather over Sudan again

WATER WORLD
Rare gene defect affects both pain, smell

A New Evolutionary History Of Primates

Study: More immigrant families are intact

Study: Neanderthals had control of fire


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. 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 SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement