invasive species

March 5, 2011

Non-native species can help ecosystems

Dov Sax

photo: Piotr Ciuchta

Sax

When new plants and animals enter an environment, they often damage it, but Dov Sax (2009) points out the many ignored benefits of certain invasive species, such as honeybees in the Americas. In his paper, Sax says non-native species can fill in gaps left by extinct species and could help ecosystems adapt in a future of rapid changes in climate and land use.

Jake Vander Zanden

University of Wisconsin-Madison, Professor, Center for Limnology

January 13, 2011

Study validates tool for detecting marine life

David Lodge

photo: Kate Gardiner, render: Michael Ströck

A new study validated the environmental DNA (eDNA) method for detecting even small populations of marine animals. The study specifically validated the use of eDNA by David Lodge and his colleagues to find invasive Asian carp in Lake Michigan. Scientists could also use the method for detecting the presence of endangered species thought to have gone extinct.

 

September 14, 2010

Action sought on Asian carp

David Lodge

photo: U.S. Army Corps of Engineers

Five states have filed a lawsuit seeking to close the connection between Lake Michigan and the Mississippi River system, where invasive Asian carp have already decimated local ecosystems. In the first full day of the trial, David Lodge testified that there is "a very imminent risk" of an Asian carp invasion into Lake Michigan that could cause irreversible damage.

June 28, 2010

Confirmation catch

David Lodge

photo: Tdk

Invasive Asian carp were caught in Lake Calumet beyond the electric barrier that was supposed to stop them, validating David Lodge's (1999) eDNA analysis that months ago found the Asian carp crossed the barrier. Several U.S. senators responded by urging President Obama to take action. One senator is pushing the Army Corps of Engineers to look into separating Lake Michigan from the Mississippi River system to protect the former from the carp, while another senator asked Illinois officials to poison Lake Calumet.

March 29, 2010

Lionfish threaten Bahamian reefs and economy

Mark Hixon

Non-native lionfish in the Bahamas are decimating populations of fish that coral reefs depend on, potentially ruining tourism and fishing industries. According to Mark Hixon (1999), whose group studies lionfish, lionfish can kill up to 80% of small fish on a reef in a few weeks. Dr. Hixon hopes to encourage fishing of the lionfish, which reportedly tastes similar to snapper, to control its explosive population growth.

 

February 13, 2010

Solution to Asian carp invasion proposed

David Lodge

photo: Mark Pellegrini

The Obama administration proposed a $78.6 million package of measures designed to stop Asian carp from invading the Great Lakes. This invasion threatens the region's $7 billion fishing industry. However, the only sure way to stop the invasion is to sever the link between Lake Michigan and the Mississippi River Basin, experts, including David Lodge (1999), testified before Congress on Tuesday. The carp, weighing up to 100 pounds, are known to hurl themselves from the water into fishermen, sometimes breaking bones. The proposal comes on the heels of a Supreme Court ruling against Michigan's suit to close the locks and protect its economy and ecology.

December 15, 2009

Carp found in Lake Michigan

David Lodge

The remains of an Asian carp, an invasive species, found in Lake Michigan confirm David Lodge's (1999) research this summer indicating that the fish have gone beyond barriers set up to keep them out. While the fish's numbers have not been confirmed, there is concern that the carp, which can grow to 50 pounds and eat 20% of their weight, will threaten other fish populations. Lodge's latest DNA samples provide evidence of the fish six miles from the lake. Read recent coverage in the Milwaukee Journal Sentinel article.

August 28, 2009

Methods for controlling lionfish sought

Mark Hixon

Mark Hixon (1999) is looking for strategies to control lionfish in the Caribbean, an invasive fish that threatens coral reef species and the local economy. Learn more from coverage at NPR.

 

July 30, 2009

Effects of grazing reassessed

Thomas Sisk

Source: USDA

Research by Tom Sisk (2001) is helping to resolve long-standing questions about whether cattle-grazing harms land. Duration and intensity of the grazing are important, but climate plays a bigger role, Sisk has found. Read the article in the Arizona Daily Sun about his work.