- Author: Kathy Keatley Garvey
Everyone from scientists to environmentalists to beekeepers are clamoring for more research on the effects of neonicotinoids on honey bees.
How do neonics affect queen bees?
Newly published research led by Geoffrey Williams of the Institute of Bee Health, Vetsuisse Faculty, University of Bern, Switzerland, indicates that neonics severely affect queen bees.
They published the article, Neonicotinoid Pesticides Severely Affect Honey Bee Queens, on Oct. 13 in the "Scientific Reports" section of Nature. The abstract:
"Queen health is crucial to colony survival of social bees. Recently, queen failure has been proposed to be a major driver of managed honey bee colony losses, yet few data exist concerning effects of environmental stressors on queens. Here we demonstrate for the first time that exposure to field-realistic concentrations of neonicotinoid pesticides during development can severely affect queens of western honey bees (Apis mellifera). In pesticide-exposed queens, reproductive anatomy (ovaries) and physiology (spermathecal-stored sperm quality and quantity), rather than flight behaviour, were compromised and likely corresponded to reduced queen success (alive and producing worker offspring). This study highlights the detriments of neonicotinoids to queens of environmentally and economically important social bees, and further strengthens the need for stringent risk assessments to safeguard biodiversity and ecosystem services that are vulnerable to these substances."
Williams and his research team correctly noted that "a plethora of literature has demonstrated lethal and sub-lethal effects of neonicotinoid pesticides on social bees in the field and laboratory" but that much of that research was done on worker bees.
"In this study, we hypothesised that exposure to field-realistic concentrations of neonicotinoid pesticides would significantly reduce honey bee queen performance due to possible changes in behaviour, and reproductive anatomy and physiology," they wrote. "To test this, we exposed developing honey bee queens to environmentally-relevant concentrations of the common neonicotinoid pesticides thiamethoxam and clothianidin. Both pesticides are widely applied in global agro-ecosystems and are accessible to pollinators such as social bees, but are currently subjected to two years of restricted use in the European Union because of concerns over their safety. Upon eclosion, queens were allowed to sexually mature. Flight behaviour was observed daily for 14 days, whereas production of worker offspring was observed weekly for 4 weeks. Surviving queens were sacrificed to examine their reproductive systems."
They called for more research on the effects of the pesticides on queen bee reproduction:
"Current regulatory requirements for evaluating safety of pesticides to bees fail to directly address effects on reproduction. This is troubling given the key importance of queens to colony survival and their frailty in adjusting to environmental conditions. Our findings highlight the apparent vulnerability of queen anatomy and physiology to common neonicotinoid pesticides, and demonstrate the need for future studies to identify appropriate measures of queen stress response, including vitellogenin expression. They additionally highlight the general lack of knowledge concerning both lethal and sub-lethal effects of these substances on queen bees, and the importance of proper evaluation of pesticide safety to insect reproduction, particularly for environmentally and economically important social bee species." Read the full report.
Meanwhile, the University of California, Davis, just held a sold-out conference on neonics. The speakers' presentations (slide shows) are posted on the California Center for Urban Horticulture's website.
Everyone agrees on this: more research is needed.
- Author: Kathy Keatley Garvey
Everyone's talking about the drones.
You know, the unmanned aerial vehicles (UAV). Those flying robots cruising over our heads--some with cameras for journalistic and research purposes and others with "need-to-know" purposes.
But in the entomological world, the word "drone" usually means a male honey bee. Or a fly. A drone fly.
To the untrained eye, the common drone fly (Eristalis tenax) looks somewhat like a honey bee, and flies somewhat like a honey bee. It feeds off pollen and nectar.
But the larva is known as a rattailed maggot and feeds off bacteria in drainage ditches, manure or cess pools, sewers and the like.
Like a worker honey bee, the adult drone fly is a pollinator and is often mistaken for a honey bee. Unlike a honey bee, however, it has one set of wings, large eyes, stubby antennae, and a distinguishing "H" on its abdomen.
Coming soon to a field near you--a drone (flying robot) and a drone fly (flying fly). Neither causes diseases nor sucks blood.
- Author: Kathy Keatley Garvey
And that it is. It's designed to alert people to a problem that needs fixing.
And that's good news for the monarch butterflies.
California Gov. Jerry Brown has just signed Assembly Bill 559, which gives authority to the Department of Fish and Wildlife to take actions to conserve monarch butterflies and their habit in California.
“In recent years California has seen a drastic decrease in the Monarch Butterfly population partly due to climate change," said Assemblywoman Patty López (D-San Fernando), author of the bill.
"Conserving this butterfly will have positive impacts on the environment and overall economy for tourism to continue to flourish in cities that the butterfly migrates to,” she said in a news release. "For decades these majestic creatures have called our state home and are an inspiring symbol to many of our communities because of its yearly migration.”
López noted--and correctly so--that monarch butterflies "have been on the verge of being endangered" in their natural habitat (the caterpillars feed only on milkweed) and that their food source has "slowly diminished in the state due to climate change and the use of herbicide among other factors."
The federal government, she said, "committed to conserve the butterfly by expanding public-private partnerships with state and local governments."
The bill is a big step toward California's commitment.
The Xerces Society for Invertebrate Conservation, headquartered in Portland, Ore., helped develop the bill. "The significant thing about this bill is that it clarifies that the California state agency charged with wildlife conservation should, in fact, be working on the conservation of monarch butterflies," said Xerces communication director Matthew Shepherd. "This may not seem a big step, but until now, because of the way that the California state endangered species act was written with respect to invertebrates, it has been unclear whether or not California Department of Fish and Wildlife actually had the authority to work on monarchs. Now they, which allows the department to invest resources and staff time on monarch conservation."
Indeed, saving the monarchs begins with you and me. Get free milkweed seeds (Google "free milkweed seeds" or plant milkweeds obtained from local nurseries.
And why not forgo or cut back on Halloween candy and instead hand out milkweed seeds to the trick or treaters?
Now that's a real treat for monarchs!
- Author: Kathy Keatley Garvey
Professor Walter Leal of the University of California, Davis, is co-chairing the 2016 International Congress of Entomology (ICE) conference, themed "Entomology Without Borders," to be held Sept. 25-30 in Orlando, Fla. Some 7000 entomologists from all over the world are expected to attend.
But he himself could be considered an "entomologist without borders."
Leal has achieved international, national and state recognition and stature for his work in insect communication and his leadership achievements.
Leal, a professor in the UC Davis Department of Molecular and Cellular Biology, and former professor and chair of the UC Davis Department of Entomology. was just named an honorary fellow of the Royal Society of Entomology at a conference held in Dublin, Ireland. He was recognized for his lifetime contributions to entomological science at the global level. He earlier was named a fellow of the society.
And, on Oct. 13, Leal will be inducted as a fellow of the California Academy of Sciences, "a governing group of more than 400 distinguished scientists who have made notable contributions to one or more of the natural sciences." Leal joins Lynne A. Isbell, a UC Davis professor in the Department of Anthropology, as the two UC Davis inductees this year.
Leal, born in Brazil and educated in Brazil and Japan, joined the UC Davis faculty in 2000. He is a fellow of the American Association for the Advancement of Science and the Entomological Society of America and is a member of the Brazilian Academy of Sciences.
A chemical ecologist, Leal is a past president of the International Society of Chemical Ecology and received the silver, medal, the society's highest honor, in 2012. He was the first non-Japanese scientist to earn tenure in the Japan Ministry of Agriculture.
Leal investigates the molecular basis of olfaction in insects and insect chemical communication. (See the Leal lab's work on DEET in Entomology Today.) He researches environmentally friendly alternatives to control insects of medical importance, and also targets agricultural pests. (See research projects.)
Leal is truly an entomologist without borders. In addition to his many global accomplishments and achievements, he is a citizen of the world, speaking his native Portuguese, as well as Japanese, and English.
- Author: Kathy Keatley Garvey
Last Dec. 27 at the Natural Bridges State Park, we saw dozens of monarchs about 80 feet up in the eucalyptus trees. When the sun broke through the trees, assorted birds targeted them, scattering them like mosaic paper kites, much to the awe and aahs of the crowd below.
"Monarch butterflies are among the largest members of the family Nymphalidae in North America. Their caterpillars store toxic chemicals called cardiac glycosides in their bodies from the milkweed they eat. Cardiac glycosides make vertebrates like us quite sick, so don't eat a monarch butterfly or caterpillar if you can help it. The chemicals remain in the adult butterfly bodies as well but tend to be concentrated more in the wings than in the body. Interestingly, cardiac glycosides seem to have very little effect on insect predators and parasites."
"The annual North American migration begins as early as August. Populations west of the Rockies migrate to the Pacific Coast with overwintering roosts along the central California coast. One of the best known of these is in Pacific Grove, California. Populations east of the Rockies migrate to central Mexico. Adult monarchs typically only live a couple of months, although they can live up to 5 or 6 months so the individuals that emerge in early summer do not migrate. Each generation takes between 5 and 6 weeks from egg to adult. The last generation of the summer goes into migratory mode. They stop reproducing and fly in a linear fashion to one of the overwintering sites. These individuals generally do not begin reproducing until the following spring in February or March when they leave these sites and move north from the Mexican site or north and east from the Pacific Coast."
Welcome back, monarchs! You're now fueling up for mass migration.
