
Biodiversity, including the diversity of pollinators such as honeybees, is crucial for ecosystem stability and sustainable development. This review highlights the complex factors contributing to Colony Collapse Disorder (CCD), focusing on inadequate bee management practices, pesticide exposure, biotic stressors, nutritional deficiencies, electromagnetic fields, and climate change. These stressors are shown to interact in ways that impair honeybee health and behavior, leading to colony declines. The paper details the biological consequences of CCD, including the absence of adult worker bees, the persistence of the queen, and the lack of dead bees within the hive. The economic impact of declining honeybee populations is significant, with losses affecting crop yields, food prices, and global trade. This decline threatens agriculture, particularly in regions dependent on pollination services. The review emphasizes the interconnectedness of honeybee health with broader ecological and economic systems, calling for urgent conservation measures, improved management practices, and sustainable agricultural strategies to mitigate the negative effects of CCD. Key recommendations for future research focus on the need for regional studies, long-term monitoring, and public education on the importance of honeybee conservation.
Electromagnetic fields and bee disappearance
One intriguing theory posits that the proliferation of telecommunications technology and the increasing prevalence of electromagnetic fields (EMFs) may play a role in CCD (Fig. 3) (Wyszkowska et al. 2019; Sahib 2011; Hill & Bartomeus 2016). Adult honeybees possess a magnetoreception sense akin to other animals, including birds, microbes, fishes, whales, dolphins, and insects. Like other organisms such as birds, microbes, fishes, whales, dolphins, and insects, adult honeybees are equipped with an impressive magnetoreception sense. This sense aids in navigation during migrations and long-distance travel (Ferrari 2014). It is postulated that magnetic fields, electromagnetic field fluctuations, and geomagnetic disturbances disrupt bees’ navigation systems, preventing their return to their hives (Ferrari 2014). In CCD the vanished bees never recover but are believed to die individually, far from their hives (Sahib 2011). Honeybees are known to detect Earth’s magnetic field, possibly using organized magnetic nanoparticles within their bodies (Liang et al. 2016; Lambinet et al. 2017). Thielens et al. conducted a study on the effects of radio-frequency electromagnetic fields (RF-EMFs) on Western honeybees (Thielens et al. 2020). Their study suggested that a modest transition in environmental incident power density, moving from frequencies below 3 GHz to higher frequencies, resulted in a notable rise in absorbed power. Active mobile phone handsets were found to have a profound impact on bee behaviour, inducing worker piping signals. Subsequent experiments confirmed these initial observations with controlled RF-EMF signal enhancements (Favre 2017). Mall and Kumar (2014) reported that radiofrequency and electromagnetic radiations can negatively impact biomolecular cells, ultimately impairing the biological structure and functions of organisms. Honeybees possess magnetic crystals in their fat bodies, and the effect of cell phone tower electromagnetic radiation on the foraging behaviour of Asiatic honeybees was observed (Taye et al. 2017). Observations included changes in returning ability, flight activity, and pollen foraging efficiency. Results revealed that colonies close to mobile phone towers were most affected, with flight activity and returning ability decreasing as proximity to the towers increased. RF-EMF from wireless devices and cell towers can cause changes in neurotransmitter functions, blood–brain barrier, morphology, calcium efflux, electrophysiology, cellular metabolism, and gene and protein expression in certain types of cells, even at low intensities (Sivani & Sudarsanam 2012). Exposure to mobile phone radiation has been shown to cause decay and damage to the internal plasma membranes of honeybee stomach cells, which in turn affect the levels of Mg, Ca, Zn, and Fe elements in the cells (Mahmoud & Gabarty 2021). Mobile phone radiation has been found to significantly reduce the hatching ratio of honeybee queens, but it did not adversely affect mating success. However, surviving queens were not negatively impacted after the exposure (Odemer & Odemer 2019).
Microwave radiation from mobile phones has been shown to cause adverse effects on different cell functions, including histological alterations in various visceral organs and changes in blood parameters in mice models (Yousif Al-Fatlawi 2022). Although Pollen foraging behavior did not show any significant difference, these findings underscore the potential harm of cell phone radiation on honeybee populations, which could have far-reaching consequences for ecosystems.
https://link.springer.com/article/10.1007/s43538-025-00399-x#Sec5
pdf: https://link.springer.com/content/pdf/10.1007/s43538-025-00399-x.pdf
Alfonso Balmori. Electromagnetic radiation as an emerging driver factor for the decline of insects. Sci Total Environ. 767:144913. https://doi.org/10.1016/j.scitotenv.2020.144913.
Highlights
• Biodiversity of insects is threatened worldwide
• This reductions is mainly attributed to agricultural practice and pesticide use
• There is sufficient evidence on the damage caused by electromagnetic radiation
• Electromagnetic radiation may be a complementary driver in this decline
• The precautionary principle should be applied before any new deployment (e.g. 5G)
Abstract
Highlights
• There are various indicators of microwave radiation impact on herbaceous vegetation.
• The best indicators are some parameters of vegetation canopy or individual plants.
Abstract
Environmental exposure to radiofrequency electromagnetic fields (RF-EMFs) from mobile telephony has rapidly increased in the last two decades and this trend is expected to continue. The effects of this exposure at plant community level are unknown and difficult to assess in a scientifically appropriate manner. Such an assessment can be scientifically adequate if a studied plant community is completely new and control-impact radiation treatment is used.
In this review we aimed to predict ecological effects and identify indicators of the impact of bioactive RF-EMFs at the mobile telephony frequency range on plant communities. We considered the scenario where a plant community was exposed to radiation generated by a base transmitting station antenna mounted on a nearby mast. This plant community can be represented by mesic meadow, ruderal or arable weed community, or other herbaceous, moderately productive vegetation type. We concentrated primarily on radiation effects that can be recorded for a year since the exposure started. To predict them we used physical theories of radiowave propagation in vegetation and the knowledge on plants physiological responses to RF-EMF. Our indicators can be used for the detection of the impact of RF-EMFs on vegetation in a control-impact experiment.
The identified indicators can be classified into the following groups: (1) canopy parameters; (2) plant characteristics to be measured in the field or laboratory in a number of individuals that represent the populations of selected species; (3) community weighted means/medians (CWMs) of plant traits and strategies; (4) the abundance of other organisms that interact with plants and can influence their fitness or population size. The group of canopy parameters includes mean height, vertical vegetation structure and dry weight of above-ground standing phytomass. Plant characteristics requiring biometric sampling in the field are plant height, the number of fruits and seeds, as well as seed viability. The group of plant traits that are calculated as CWMs covers seed releasing height, seed dispersal mode, SLA, leaf orientation, month of germination and flowering, Ellenberg’s light indicator value, and the proportion of individuals in the classes of competitors and stress tolerators according to Grime's CSR strategy scheme. The group of “non-plant” indicators includes primarily the frequency of flower visits by beetles, wasps, hoverflies, and bees that have their nests over ground. To detect ecological responses that occur for the first year since a herbaceous community has been exposed to potentially bioactive RF-EMF, the first two indicators groups should be used.
Aug 1, 2019 (Updated Nov 1, 2019)
Selected Studies that Reported Adverse Effects of Electromagnetic Field (EMF) Exposure
on Plants, Animals and Insects
Shepherd S, Hollands G, Godley VC, Sharkh SM, Jackson CW, Newland PL. Increased aggression and reduced aversive learning in honey bees exposed to extremely low frequency electromagnetic fields. PLoS One. 2019 Oct 10;14(10):e0223614. doi: 10.1371/journal.pone.0223614.
Southern WE. 1975. Orientation of gull chicks exposed to project Sanguine's electromagnetic field. Science. 189 (4197): 143–145.
Increased aggression and reduced aversive learning in honey bees exposed to extremely low frequency electromagnetic fields
Shepherd S, Hollands G, Godley VC, Sharkh SM, Jackson CW, Newland PL. Increased aggression and reduced aversive learning in honey bees exposed to extremely low frequency electromagnetic fields. PLoS One. 2019 Oct 10;14(10):e0223614. doi: 10.1371/journal.pone.0223614.
Abstract
Honey bees, Apis mellifera, are a globally significant pollinator species and are currently in decline, with losses attributed to an array of interacting environmental stressors. Extremely low frequency electromagnetic fields (ELF EMFs) are a lesser-known abiotic environmental factor that are emitted from a variety of anthropogenic sources, including power lines, and have recently been shown to have a significant impact on the cognitive abilities and behaviour of honey bees. Here we have investigated the effects of field-realistic levels of ELF EMFs on aversive learning and aggression levels, which are critical factors for bees to maintain colony strength. Bees were exposed for 17 h to 100 μT or 1000 μT ELF EMFs, or a sham control. A sting extension response (SER) assay was conducted to determine the effects of ELF EMFs on aversive learning, while an intruder assay was conducted to determine the effects of ELF EMFs on aggression levels. Exposure to both 100 μT and 1000 μT ELF EMF reduced aversive learning performance by over 20%. Exposure to 100 μT ELF EMFs also increased aggression scores by 60%, in response to intruder bees from foreign hives. These results indicate that short-term exposure to ELF EMFs, at levels that could be encountered in bee hives placed under power lines, reduced aversive learning and increased aggression levels. These behavioural changes could have wider ecological implications in terms of the ability of bees to interact with, and respond appropriately to, threats and negative environmental stimuli.
Open access paper: https://journals.plos.org/
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Letter to the National Park Service from the Environmental Health Trust
This well-documented letter (81 references) can be downloaded from the following link:
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A Briefing Memo by Dr. Albert Manville
Also see:
Cell Tower Radiation Affects Wildlife: Dept. of Interior Attacks FCC
Cell Tower Health Effects