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!
Closing in on advanced prostate cancer
13.12.2017 | Institute for Research in Biomedicine (IRB Barcelona)
Visualizing single molecules in whole cells with a new spin
13.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
13.12.2017 | Health and Medicine
13.12.2017 | Physics and Astronomy
13.12.2017 | Life Sciences