Tag: invasives

Invasives Leave Parasites Behind

Plants and animals that come from overseas sometimes out-compete species that are native to the region. Scientists have long debated what makes the invaders so successful. One hypothesis is that invasive species have fewer natural enemies. New research supports this idea. The Great Lakes Radio Consortium’s Rebecca Williams has details:

Transcript

Plants and animals that come from overseas sometimes out-compete species that are native to the
region. Scientists have long debated what makes the invaders so successful. One hypothesis is
that invasive species have fewer natural enemies. New research supports this idea. The Great
Lakes Radio Consortium’s Rebecca Williams has details:


Invasive animals and plants have fewer parasites and diseases than their native competitors.


That’s according to two new studies published in the journal Nature. In one study, researchers
analyzed parasites of 26 invasive species, including the zebra mussel.


Kevin Lafferty is an author of the study. He says when a foreign species invades a new area, it
leaves most of its parasites behind. He says importing those natural enemies might be a good
way to control invasives.


“There’s still several species, on average, about 13 parasite species back in the introduced
species’ home range, that we could consider for biological control, and of course an important
part of that process is to determine which ones might be safe, in terms of not infecting our native
species.”


A second study looked at nearly 500 plants that have been brought into the U.S. Researchers
found that plants that leave behind the most pathogens are the most likely to become invasive.


For the Great Lakes Radio Consortium, I’m Rebecca Williams.

Radio Waves Zap Zebra Mussels

Researchers say low frequency radio waves may be a more effective way of controlling zebra mussels. The Great Lakes Radio Consortium’s Tom Scheck has the story:

Transcript

Researchers say low frequency radio waves may be a more effective way of controlling zebra mussels. The Great Lakes Radio Consortium’s Tom Scheck reports.

Zebra mussels have caused millions of dollars of damage to power plants, boats and intake pipes. They’ve also seriously hurt native species in the Great Lakes and other inland waterways. Purdue University chemistry professor Matthew Ryan says he may have found a way to control the zebra mussels without harming fish or other aquatic wildlife. In the laboratory, he says low frequency electromagnetic radio waves were found to cause the zebra mussels to lose critical minerals at a much faster rate than they can acquire them.


“It ultimately kills them. There’s a stress response after a day or so. They stop feeding and begin to close their shells and after about 19 days about 50 percent of the mussels in a given population will be dead.”


Ryan says native fish and clams were not harmed when exposed to the same technique. If it’s proven effective in the wild, he says electrical barriers could block mussels from infesting other lakes and streams. For the Great Lake Radio Consortium, I’m Tom Scheck in Saint Paul.