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The urban decline of the house sparrow (Passer domesticus): A possible link with electromagnetic radiation

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Balmori A and O Hallberg · 2007

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The study found significantly lower sparrow densities in areas with higher electromagnetic field strength, supporting a hypothesis linking electromagnetic pollution to urban bird population decline.

Plain English Summary

Summary written for general audiences

This 2007 study examined house sparrow population decline in Valladolid, Spain between 2002-2006 by correlating bird density with electromagnetic field strength from radiofrequencies and microwaves (1 MHz-3 GHz). The researchers found a significant negative correlation (R = -0.87) between bird density and electric field strength, suggesting electromagnetic radiation from phone antennae may be associated with sparrow population decline.

Why This Matters

This observational study identifies a correlation between EMF exposure and sparrow population density, though correlation does not establish causation. The authors acknowledge that electromagnetic pollution may act independently or in combination with other factors in affecting bird populations, and recommend more controlled studies to test the hypothesis.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Balmori A and O Hallberg (2007). The urban decline of the house sparrow (Passer domesticus): A possible link with electromagnetic radiation.
Show BibTeX
@article{the_urban_decline_of_the_house_sparrow_passer_domesticus_a_possible_link_with_electromagnetic_radiation_ce4871,
  author = {Balmori A and O Hallberg},
  title = {The urban decline of the house sparrow (Passer domesticus): A possible link with electromagnetic radiation},
  year = {2007},
  doi = {10.1667/RR0553.1},
  
}
DOI: 10.1667/RR0553.1PubMed: 17613041

Quick Questions About This Study

The study analyzed 407,391 nuclear industry workers across 15 countries, making it the largest epidemiological study of low-dose radiation effects to date. This massive scale provides unprecedented statistical power to detect health effects.
Lung cancer showed the strongest association with radiation dose, with an 86% increased risk per unit exposure. Multiple myeloma and ill-defined cancers also showed significant or borderline significant increases among the 31 cancer types studied.
Yes, the study found a 97% increase in cancer mortality per unit of radiation dose. This demonstrates that even low-level exposures can accumulate into measurable increases in cancer deaths when sustained over decades.
The healthy worker survivor effect occurs when radiation-sensitive workers leave their jobs early due to health problems, leaving behind workers who appear more resistant to radiation effects. This can make radiation risks appear lower than they actually are.
The study included 5.2 million person-years of follow-up, meaning researchers tracked workers for many years to observe long-term health outcomes. This extended monitoring period was crucial for detecting cancer effects that develop slowly over time.