http://www.eurekalert.org/pub_releases/2010-10/eu-sfm100810.php
Public release date: 11-Oct-2010
[ Print | E-mail | Share ] [ Close Window ]
Contact: Beverly Clark
beverly.clark@emory.edu
404-712-8780
Emory University
Study finds monarch butterflies use medicinal plants to treat offspring
for disease
Monarch butterflies appear to use medicinal plants to treat their
offspring for disease, research by biologists at Emory University shows.
Their findings were published online Oct. 6 in the journal Ecology
Letters.
"We have shown that some species of milkweed, the larva's food plants,
can reduce parasite infection in the monarchs," says Jaap de Roode, the
evolutionary biologist who led the study. "And we have also found that
infected female butterflies prefer to lay their eggs on plants that will
make their offspring less sick, suggesting that monarchs have evolved
the ability to medicate their offspring." (See interview with de Roode
here: http://tinyurl.com/3995m3u )
Few studies have been done on self-medication by animals, but some
scientists have theorized that the practice may be more widespread than
we realize. "We believe that our experiments provide the best evidence
to date that animals use medication," de Roode says.
"The results are also exciting because the behavior is
trans-generational," says Thierry Lefevre, a post-doctoral fellow in de
Roode's lab. "While the mother is expressing the behavior, only her
offspring benefit. That finding is surprising for monarch butterflies."
The findings also may have implications for human health, says
University of Michigan chemical ecologist Mark Hunter, who collaborated
with de Roode's group on the research.
"When I walk around outside, I think of the plants I see as a great,
green pharmacy," Hunter says. "But what also strikes me is how little we
actually know about what that pharmacy has to offer. Studying organisms
engaged in self-medication gives us a clue as to what compounds might be
worth investigating for their potential as human medicines."
Monarch butterflies are known for their spectacular migration from the
United States to Mexico each year, and for the striking pattern of
orange, black and white on their wings. That bright coloration is a
warning sign to birds and other predators that the butterfly may be
poisonous.
Monarch caterpillars feed on any of dozens of species of milkweed
plants, including some species that contain high levels of cardenolides.
These chemicals do not harm the caterpillars, but make them toxic to
predators even after they emerge as adults from their chrysalises.
Previous research has focused on whether the butterflies choose more
toxic species of milkweed to ward off predators. De Roode wondered if
the choice could be related to the Ophryocystis elektroscirrha. The
parasites invade the gut of the caterpillars and then persist when they
become adult monarchs. An infected female passes on the parasites when
she lays her eggs. If the adult butterfly leaves the pupal stage with a
severe parasitic infection, it begins oozing fluids from its body and
dies. Even if the butterflies survive, they do not fly as well or live
as long as uninfected ones.
Experiments in de Roode's lab have shown that a female infected with the
parasites prefers to lay her eggs on a toxic species of milkweed, rather
than a non-toxic species. Uninfected female monarchs, however, showed no
preference.
Researchers have studied the kinds of leaves that primates eat in
forests, but this work with butterflies stresses the point that even
insects in our own back yard can be useful indicators of what might be
medicinally active, Hunter says.
###
De Roode recently received a $500,000 grant from the National Science
Foundation, which he will use to see if the lab results can be
replicated in nature, in different populations of monarchs in various
regions of the world. Hunter received $150,000 from the NSF to identify
the chemicals that account for the medicinal properties of the milkweed
plants.
More news from Emory: www.emory.edu/esciencecommons.
--
Bill S. Jersey USA zone 5 shade garden
http://www.informationisbeautiful.net/play/snake-oil-supplements/
http://www.lascaux.culture.fr/index.php?lng=fr&acc=true
b2forewagner@snip.net says...
> Researchers have studied the kinds of leaves that primates eat in
> forests, but this work with butterflies stresses the point that even
> insects in our own back yard can be useful indicators of what might be
> medicinally active, Hunter says.
Linnaeus named it Asclepias for a reason.
We now grow A. syriaca, A. incarnata, and A. tuberosa in our garden to
draw pollinators.
So far we've seen many monarch eggs laid on A. syriaca with none
hatched.
> b2forewagner@snip.net says...
>
>
> > Researchers have studied the kinds of leaves that primates eat in
> > forests, but this work with butterflies stresses the point that even
> > insects in our own back yard can be useful indicators of what might be
> > medicinally active, Hunter says.
>
> Linnaeus named it Asclepias for a reason.
>
> We now grow A. syriaca, A. incarnata, and A. tuberosa in our garden to
> draw pollinators.
>
> So far we've seen many monarch eggs laid on A. syriaca with none
> hatched.
My oldest daughter is named "Linnea". We have about 5 varieties of
milkweed about. One is covered with aphids I noticed yesterday. This
in a garden creeping towards fall with the promise of 80 F. today
--
Bill S. Jersey USA zone 5 shade garden
http://www.informationisbeautiful.net/play/snake-oil-supplements/
http://www.lascaux.culture.fr/index.php?lng=fr&acc=true
b2forewagner@snip.net says...
>
> > b2forewagner@snip.net says...
> >
> >
> > > Researchers have studied the kinds of leaves that primates eat in
> > > forests, but this work with butterflies stresses the point that even
> > > insects in our own back yard can be useful indicators of what might be
> > > medicinally active, Hunter says.
> >
> > Linnaeus named it Asclepias for a reason.
> >
> > We now grow A. syriaca, A. incarnata, and A. tuberosa in our garden to
> > draw pollinators.
> >
> > So far we've seen many monarch eggs laid on A. syriaca with none
> > hatched.
>
> My oldest daughter is named "Linnea". We have about 5 varieties of
> milkweed about. One is covered with aphids I noticed yesterday. This
> in a garden creeping towards fall with the promise of 80 F. today
Linnea ...After the linden tree, twinflower or the botanist?
Do you see many monarch caterpillars on your milkweeds?
On Mon, 11 Oct 2010 07:19:58 -0400, Bill who putters
>http://www.eurekalert.org/pub_releases/2010-10/eu-sfm100810.php
>Public release date: 11-Oct-2010
>[ Print | E-mail | Share ] [ Close Window ]
>Contact: Beverly Clark
>beverly.clark@emory.edu
>404-712-8780
>Emory University
>Study finds monarch butterflies use medicinal plants to treat offspring
>for disease
>Monarch butterflies appear to use medicinal plants to treat their
>offspring for disease, research by biologists at Emory University shows.
>Their findings were published online Oct. 6 in the journal Ecology
>Letters.
>"We have shown that some species of milkweed, the larva's food plants,
>can reduce parasite infection in the monarchs," says Jaap de Roode, the
>evolutionary biologist who led the study. "And we have also found that
>infected female butterflies prefer to lay their eggs on plants that will
>make their offspring less sick, suggesting that monarchs have evolved
>the ability to medicate their offspring." (See interview with de Roode
>here: http://tinyurl.com/3995m3u )
>Few studies have been done on self-medication by animals, but some
>scientists have theorized that the practice may be more widespread than
>we realize. "We believe that our experiments provide the best evidence
>to date that animals use medication," de Roode says.
>"The results are also exciting because the behavior is
>trans-generational," says Thierry Lefevre, a post-doctoral fellow in de
>Roode's lab. "While the mother is expressing the behavior, only her
>offspring benefit. That finding is surprising for monarch butterflies."
>The findings also may have implications for human health, says
>University of Michigan chemical ecologist Mark Hunter, who collaborated
>with de Roode's group on the research.
>"When I walk around outside, I think of the plants I see as a great,
>green pharmacy," Hunter says. "But what also strikes me is how little we
>actually know about what that pharmacy has to offer. Studying organisms
>engaged in self-medication gives us a clue as to what compounds might be
>worth investigating for their potential as human medicines."
>Monarch butterflies are known for their spectacular migration from the
>United States to Mexico each year, and for the striking pattern of
>orange, black and white on their wings. That bright coloration is a
>warning sign to birds and other predators that the butterfly may be
>poisonous.
>Monarch caterpillars feed on any of dozens of species of milkweed
>plants, including some species that contain high levels of cardenolides.
>These chemicals do not harm the caterpillars, but make them toxic to
>predators even after they emerge as adults from their chrysalises.
>Previous research has focused on whether the butterflies choose more
>toxic species of milkweed to ward off predators. De Roode wondered if
>the choice could be related to the Ophryocystis elektroscirrha. The
>parasites invade the gut of the caterpillars and then persist when they
>become adult monarchs. An infected female passes on the parasites when
>she lays her eggs. If the adult butterfly leaves the pupal stage with a
>severe parasitic infection, it begins oozing fluids from its body and
>dies. Even if the butterflies survive, they do not fly as well or live
>as long as uninfected ones.
>Experiments in de Roode's lab have shown that a female infected with the
>parasites prefers to lay her eggs on a toxic species of milkweed, rather
>than a non-toxic species. Uninfected female monarchs, however, showed no
>preference.
>Researchers have studied the kinds of leaves that primates eat in
>forests, but this work with butterflies stresses the point that even
>insects in our own back yard can be useful indicators of what might be
>medicinally active, Hunter says.
>###
>De Roode recently received a $500,000 grant from the National Science
>Foundation, which he will use to see if the lab results can be
>replicated in nature, in different populations of monarchs in various
>regions of the world. Hunter received $150,000 from the NSF to identify
>the chemicals that account for the medicinal properties of the milkweed
>plants.
>More news from Emory: www.emory.edu/esciencecommons.
This gets a "gee, duh" from me. Scientists are just now figuring out
that other species besides humans use medicinal herbs?
Kate, who bottled up astragalus and kava kava today
XML site map
> forests, but this work with butterflies stresses the point that even
> insects in our own back yard can be useful indicators of what might be
> medicinally active, Hunter says.