小龙虾跑到大湖了？# Joke - 肚皮舞运动
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Red swamp crayfish could be the next invasive species to take up residence
in the Great Lakes, researchers say.
While the red-hued crayfish are considered a culinary delight in places like
New Orleans, they can wreak havoc on freshwater ecosystems.
They can grow up to 5 inches long and eat native fish, aquatic plants,
amphibians and even other crayfish, which could be detrimental for the Great
Lakes if they become established.
“We’ve been worried about the red swamp crayfish, which is kind of the
most globally widespread and harmful of invasive crayfish,” Eric Larson, an
assistant professor in the Natural Resources and Environmental Sciences
Department at the University of Illinois, told the Great Lakes Echo.
Females can carry up to 900 eggs and reproduce several times a year, which
means once they are established it becomes very difficult to get rid of them.
“I think crayfish are very difficult to remove after they’ve established a
population,” Larson said.
“You don’t have to miss a lot of individuals in a lake or a pond for that
population to bounce back. It’s not impossible, but it can be costly and
time consuming, and where we can, we’d really like to prevent invasions
from happening.”
The hardy crayfish aggressively competes for food and habitat with native
crayfish and other species.
“Most ecosystems have crayfish in them, and when red swamp crayfish come in
, they can compete with these existing native crayfish for food or shelter
and displace them,” Rachel Egly, a research associate at the Institute of
Environmental Sustainability at Loyola University Chicago, told the Echo. “
This can really change food webs and how other organisms interact with this
new species.”
Native to the Gulf Coast region of the United States and Mexico, the
crayfish have been spotted in Michigan inland waters and in Lake Erie's
Sandusky Bay in Ohio.
It is believed the introduction of the crayfish to Sandusky Bay may have
been intentional in an attempt to get a harvestable population established
for human consumption, the U.S. Geological Survey says.
Alternative theories suggest anglers bought the crayfish to use as bait or
they were introduced through classroom releases or the aquaculture industry,
according to Michigan State University.
To prevent the spread of the invasive species, some states, including
Michigan, have made it illegal to transport live red swamp crayfish for
whatever reason. Other efforts include education and public outreach.
According to the U.S. Environmental Protection Agency, at least 25 invasive
species have taken up residence in the Great Lakes since the 1800s,
including zebra mussels, round gobies and the Asian carp.
in the Great Lakes, researchers say.
While the red-hued crayfish are considered a culinary delight in places like
New Orleans, they can wreak havoc on freshwater ecosystems.
They can grow up to 5 inches long and eat native fish, aquatic plants,
amphibians and even other crayfish, which could be detrimental for the Great
Lakes if they become established.
“We’ve been worried about the red swamp crayfish, which is kind of the
most globally widespread and harmful of invasive crayfish,” Eric Larson, an
assistant professor in the Natural Resources and Environmental Sciences
Department at the University of Illinois, told the Great Lakes Echo.
Females can carry up to 900 eggs and reproduce several times a year, which
means once they are established it becomes very difficult to get rid of them.
“I think crayfish are very difficult to remove after they’ve established a
population,” Larson said.
“You don’t have to miss a lot of individuals in a lake or a pond for that
population to bounce back. It’s not impossible, but it can be costly and
time consuming, and where we can, we’d really like to prevent invasions
from happening.”
The hardy crayfish aggressively competes for food and habitat with native
crayfish and other species.
“Most ecosystems have crayfish in them, and when red swamp crayfish come in
, they can compete with these existing native crayfish for food or shelter
and displace them,” Rachel Egly, a research associate at the Institute of
Environmental Sustainability at Loyola University Chicago, told the Echo. “
This can really change food webs and how other organisms interact with this
new species.”
Native to the Gulf Coast region of the United States and Mexico, the
crayfish have been spotted in Michigan inland waters and in Lake Erie's
Sandusky Bay in Ohio.
It is believed the introduction of the crayfish to Sandusky Bay may have
been intentional in an attempt to get a harvestable population established
for human consumption, the U.S. Geological Survey says.
Alternative theories suggest anglers bought the crayfish to use as bait or
they were introduced through classroom releases or the aquaculture industry,
according to Michigan State University.
To prevent the spread of the invasive species, some states, including
Michigan, have made it illegal to transport live red swamp crayfish for
whatever reason. Other efforts include education and public outreach.
According to the U.S. Environmental Protection Agency, at least 25 invasive
species have taken up residence in the Great Lakes since the 1800s,
including zebra mussels, round gobies and the Asian carp.
