Weapon of Mass Wildlife Destruction: Neonicotinoid Pesticides “At the Root of Global Wildlife Declines”

Real Farmacy
By Justin Gardener

If massive bee die-offs are not enough, neonicotinoid pesticides are causing millions of bat deaths and are contributing to many other wildlife declines. Researchers conducted an in-depth review of existing literature and report their findings in the Journal of Environmental Immunology and Toxicology.

Strong correlations are found in the rise of neonicotinoid pesticides and Colony Collapse Disorder, as well as plummeting wildlife populations in areas where the chemicals are heavily used. Outbreaks of infectious diseases in many wildlife populations, including fish, amphibians, bats, and birds, coincide on a temporal and geographic scale with the emerging use of the pesticides. Non-target insects are also being wiped out, depriving wildlife of a food source.

How could this new class of pesticide have such a devastating effect on so many types of wildlife? Neonicotinoid pesticides are designed to disrupt the central nervous system. While very effective on pests, they are not specific to pests and appear to work on all animal life forms from invertebrates to mammals. In the case of honey bees, for example, the neurotoxins can kill them outright or cause “sublethal” effects such as disrupting their ability to forage.

The researchers hypothesize that neonicotinoid pesticides have another sublethal effect by damaging the immune system of a variety of wildlife, making them more susceptible to infectious disease outbreaks that correlate with use of the pesticide. This is thought to be a contributing factor in the bees’ inability to ward off the Varrea mite that is a factor in Colony Collapse Disorder. Even after treatment for the mite, honey bees still cannot fight off the mites enough to prevent collapse.

Is this the new DDT?

Unlike some other biocides, neonicotinoids are persistent in the environment, meaning that they do not break down quickly. These pesticides are typically applied to crop seeds. The chemical is ingested into the plant and travels to the growing shoots and flowers, where it is toxic to anything that eats any part of it. Honey bees take toxic pollen back to their hives where it wreaks havoc. The chemicals are also applied as a soil treatment. When it rains, the chemicals get washed into aquatic ecosystems.

Here is where it damages amphibians and other aquatic organisms. New and devastating pathogens were discovered in frog species after the emergence of neonicotinoids. Another study found that exposure to low but constant concentrations of the pesticides has lethal effects on freshwater invertebrates. Experiments on native freshwater shrimps found that this type of exposure impaired their mobility and feeding behavior, leading to slow starvation. Invertebrates are critical links in aquatic ecosystems.

In 2012 it was reported that 6.7 million bats died in the U.S. due to a new pathogen called White Nose Syndrome. This fungal virus began decimating bat populations as the use of neonicotinoid pesticides ramped up in the early and mid-2000s. Bats feed on insects, and exposure to small cumulative doses of the chemicals reduces bats’ immune response, thereby leaving them susceptible to White Nose Syndrome.

Something so “effective” in the chemical agriculture system, as neonicotinoid pesticides are, is bound to have negative repercussions in the environment. The motivation is profit, and there is no profit in being concerned for wildlife. Producing chemical solutions and genetically-engineered, patented crops is the obsession of Bayer CropScience and its cohorts in the industry. And the U.S. government is a willing co-conspirator. While Europe has enacted a ban on neonicotinoid pesticides, the U.S. plows on as if nothing is wrong.

Pest Infestation-Reducing Bats Dying from Pesticide Exposure


We may need to teach ourselves about the ‘bats and the bees’ if we want to keep feeding ourselves. Research is now confirming what has been observed by many farmers: Bats are necessary for keeping many types of crop-eating insect populations from swarming, and their populations are becoming dramatically reduced due to the widespread use of pesticides on our crops.

Researchers from the University of Tennessee tracked populations, eating habits and migration patterns of Brazilian bats (Tadarida brasiliensis), and compared them to the patterns of corn earworm moths (Helicoverpa zea) through multiple seasons.

They determined that the bats tracked and migrated with the moth infestations, and fed off of the moths where they gathered – among corn crops. The bats were found to migrate to moth infestations, dramatically reducing their populations. The evidence provided confirmation that bats are lethal predators of these and other pests that threaten our crops.

The researchers confirmed with their conclusion the importance of bats to preventing pest infestations on cropland and urban areas: “Our results support growing evidence for the role of generalist predators, and bats specifically, as agents for biological control and speak to the value of conserving indigenous generalist predators.”

At least 70% of bats are insect-eaters. The type of insect eaten depends greatly upon the species. There are over 1,200 species of bats. They will typically eat the insects known to infest that particular geographical region, but many also migrate with the insects as determined in the Tennessee research. Some bat colonies have been observed eating tens of thousands of pounds of insects each night.

Bats are dying by the millions

The problem, however, is that bat populations are being reduced in many areas, and researchers are suspecting the involvement of pesticides. This is concerning numerous bat and environmental experts, who have connected insect infestations to bat population reductions.

According to the Bat Conservation International, a group committed to the conservation of bats, more than 5.7 million (and possibly up to 6.7 million) bats have died from a disease called the White-nose Syndrome. The disease appears to be connected to a fungus, but is also related to immunosuppression among the bats.

The link to pesticides

The syndrome is strikingly similar to the bee’s colony collapse disorder, which many have attributed to a virus, but more recent research is connecting the disorder to pesticides. The research on CCD among bees has increasingly indicated that pesticides weaken the immune system, allowing the infection to take hold. Now this connection is also being made among bats.

Researchers from the State University of New York and the New York State Department of Health with the Department of Environmental Health Sciences released a study that illustrated that bats were accumulating toxic chemicals from pesticides and these were connected with their subsequent immunosuppression as well as hormone disruption.

They found that little brown bats found diseased with the White-nose syndrome also had significantly high levels of several pesticide- and herbicide-related chemicals in their fat tissues. These included polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), polybrominated biphenyls (PBBs), organochlorine pesticides (OCPs which include DDT, chlordanes, HCB, and HCH). They found the highest levels of PCBs and PBDE concentrations in the bat fatty tissues were related to bats from regions with cropland spraying of pesticides.

The connection between declining bat populations and pesticides is also beginning to unfold among other research. Researchers from Germany’s University of Koblenz-Landau tested bats and bat activity among apple orchards before and after the orchards had been sprayed with pesticides. They found that bats were increasingly retaining pesticide residues and this was decreasing their activities and populations among the orchards.

Their research concluded a connection between pesticides and bat population loss: “The results emphasize the importance of adequately evaluating the risks of pesticides to bats, which, compared to other mammals, are potentially more sensitive due to their ecological traits.”

Bat populations are slow to rebound

Bats typically will have only one offspring, meaning that re-population of bats is a long and difficult process.

Bat experts have calculated that the loss of 5.7 million bats converts to nearly 4 billion pounds of additional insects. According to Bat Conservation International’s Executive Director Nina Fascione, losses in bat populations indicate a critical issue to come, as “the environmental and economic costs will be enormous.”

The loss of our bat populations will not only produce greater incidence of pest infestations. Many species of bats are important pollinators for many types of fruits. These species of bats prefer eating pollen to eating the insects that attack plants. The bats go from flower to flower eating pollen. Some of that pollen gets stuck in their fir, getting carried to other flowers. This effective pollination method is very similar to bees who transfer the sticky pollen from plant to plant as they harvest different flowers.

Most bat experts agree that bats are still somewhat mysterious due to their nocturnal activities. We are slowing realizing – and possibly too late – is that our widespread use of chemical pesticides is backfiring. Not only are we becoming poisoned by them: Those beneficial species that work alongside our food crops to assure their pollination and pest control are also becoming poisoned, and this may well threaten the future of our food supply.