The bivalve effect

May 03, 2010
Sea stars (Pisaster ochraceous) are predators that can control local population abundance within rocky intertidal communities by consuming the dominant mussel (Mytilus californianus). Credit: Dr. Tarik C. Gouhier

McGill biologist Dr. Frederic Guichard says marine life can communicate over thousands of kilometers, calling into question current fishery management and marine preservation practices. "If I kill mussels in San Diego, it will have an impact in Seattle. We now know that populations are connected," he said.

Explaining and understanding life cycles is on many people's minds in spring, and McGill Biologist Dr. Frédéric Guichard is no exception - in fact, he's made a fascinating discovery relating to the life, death, reproduction and communication... of mussels. Guichard says can communicate over thousands of kilometres, calling into question current and marine preservation practices. "If I kill in San Diego, it will have an impact in Seattle. We now know that populations are connected," he said.

Using mathematical modeling and data from natural populations, Guichard and his colleagues, Dr. Tarik Gouhier and Dr. Bruce A. Menge at Oregon State University, found a phenomenon similar to the "butterfly effect," whereby the actions of one individual can cause a series of chain reactions. Mussel populations communicate by actions such as releasing larvae or dying. "Current practices are based on the knowledge that a mussel can travel no further than 100 km in its lifespan, so efforts are focused on local areas in the belief that we can control local populations," Guichard explains. "But this 'fence approach' only looks at the life history of an animal, which isn't enough to predict how it will affect its environment and other marine life.

"We can now see what we normally don't look for in the wild, so we can use this model to better manage their numbers. Scientists have long theorized about this, but this is the proof," Guichard said.

The principles of their discovery should be applicable to many species and will have important ramifications in the short term for the design of marine reserves and in the longer term for fisheries management. Frédéric Guichard was funded by the James McDonnell Foundation and the research was published in the .

Explore further: US charges safari owners with illegal rhino hunts

add to favorites email to friend print save as pdf

Related Stories

New System Traces Origins of Marine Creatures

Mar 22, 2007

Tracing the origins of marine animals can be extremely difficult, especially in the free-flowing, soup-like conditions of the ocean, but obtaining this information is vital not only for understanding these ...

Brand new species of bacterium found in Sweden

Apr 19, 2010

Researchers at the Sven Lovén Centre for Marine Sciences at the University of Gothenburg, Sweden, have discovered a brand new species of bacterium found only in the Gullmarsfjord north of Gothenburg. ...

Recommended for you

How can we help endangered vultures?

11 hours ago

Zoologists from the School of Natural Sciences at Trinity College Dublin are proposing an ingenious idea to help conserve populations of African white-backed vultures. The iconic birds, which play a critical ...

Scientists work to save endangered desert mammal

12 hours ago

Amargosa voles, small rodents that inhabit rare marshes of the Mojave Desert, have faced dire circumstances in recent years. Loss of habitat, extreme drought and climate change brought this subspecies of ...

User comments : 0