Using molecular tools, biologist Joe Roman, conducting research at Harvard University's Department of Organismic and Evolutionary Biology, found that it was the injection of new lineages in northern Nova Scotia that was responsible for the crab's success in the north.
Roman's article, "Diluting the founder effect: Cryptic invasions expand a marine invader's range" will be published in the online edition of Proceedings of the Royal Society B: Biological Sciences on June 21, 2006.
The green crab has long been a resident of North America. A native of Europe, it was probably released among the ballast rocks of ships crossing the Atlantic around the time of the American Revolution. Since the 1950s, its spread has stalled in Nova Scotia; the waters off Cape Breton and the Gulf of Saint Lawrence were thought to be too cold for the species' survival.
In recent years, however, a rapid expansion around Cape Breton and north to Prince Edward Island and the Magdalen Islands of Quebec had fish and wildlife managers concerned about impacts on local fisheries and native crabs.
The DNA used to track this invasion suggests that these northern crabs constitute a new invasion front, which may have arrived in the waters around the Strait of Canso through shipping from the North Sea. The new invasion has been surprisingly successful in the Gulf of Saint Lawrence.
"These multiple invasions are happening all over the world," Roman says, "and many of them go undetected."
Using DNA, biologists have uncovered cryptic invasions among such prominent invaders as zebra mussels and the brown algae Undaria. According to Roman, "It's clear that the pressure of these multiple invasions is having a devastating effect on our waterways." Invasive aquatic species can be released through ballast water, aquaculture, aquaria, and even live seafood.
Joe Roman | EurekAlert!
The birth of a new protein
20.10.2017 | University of Arizona
Building New Moss Factories
20.10.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
20.10.2017 | Information Technology
20.10.2017 | Materials Sciences
20.10.2017 | Interdisciplinary Research