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The Costs of Bat Decline

Can we afford to lose bats? A recent study by Eyal Frank of the University of Chicago reveals that the dramatic decline in U.S. bat populations due to white-nose syndrome (WNS) has led to significant economic and health consequences.

Key Findings:

  • Increased Pesticide Use: With bats serving as natural pest controllers, their decline forced farmers to increase chemical pesticide use by approximately 31%.
  • Rise in Infant Mortality: The heightened pesticide usage correlates with a 7.9% increase in infant mortality rates in affected counties, amounting to an estimated 1,334 additional infant deaths between 2006 and 2017.
  • Economic Impact: Farmers experienced nearly a 29% drop in crop revenue, and combined with health-related costs, the total societal loss is estimated at $39.3 billion.
A Brazilian free-tailed bat (Tadarida brasiliensis) eating a corn earworm moth (Helicoverpa zea) in Texas. Insect-eating bats save farmers approximately $23 billion in annual agricultural losses in the United States alone.
Brazilian free-tailed bats (Tadarida brasiliensis) emerging from Bracken Cave, Texas. These bats can consume 100 tons or more of insects in a single night!

Conclusion:

This study underscores the critical role bats play in agriculture and public health. Their decline not only disrupts ecosystems but also imposes substantial economic and human health costs. Conservation efforts to protect bat populations are not just about preserving biodiversity — they are essential investments in our economy and human health.

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Madelline Mathis

Madelline Mathis has a degree in environmental studies from Rollins College and a passion for wildlife conservation. She is an outstanding nature photographer who has worked extensively with Merlin and other MTBC staff studying and photographing bats in Mozambique, Cuba, Costa Rica, and Texas. Following college graduation, she was employed as an environmental specialist for the Florida Department of Environmental Protection. She subsequently founded the Florida chapter of the International DarkSky Association and currently serves on the board of DarkSky Texas. She also serves on the board of Houston Wilderness and was appointed to the Austin Water Resource Community Planning Task Force.

Michael Lazari Karapetian

Michael Lazari Karapetian has over twenty years of investment management experience. He has a degree in business management, is a certified NBA agent, and gained early experience as a money manager for the Bank of America where he established model portfolios for high-net-worth clients. In 2003 he founded Lazari Capital Management, Inc. and Lazari Asset Management, Inc.  He is President and CIO of both and manages over a half a billion in assets. In his personal time he champions philanthropic causes. He serves on the board of Moravian College and has a strong affinity for wildlife, both funding and volunteering on behalf of endangered species.