Bumblebees Facing Existential Threat from Rising Temperatures, New Study Finds

A Threat to Survival

rising temperatures. A new study by University of Guelph environmental science professor Peter Kevan and his team has found that excessive heat is a significant factor in bumblebee decline.

Bumblebees, like humans, have an optimal temperature range for survival and development. This range varies by species, but generally falls between 30 and 32 degrees Celsius (86 and 89.6 degrees Fahrenheit). While bumblebees can thermoregulate to some extent, their nests and developing larvae are particularly vulnerable to heat stress.

The study found that nest temperatures above 35 degrees Celsius (95 degrees Fahrenheit) become lethal for bumblebee larvae. This is concerning, given the recent record-breaking temperatures and the projected rise in global temperatures due to climate change.

Excessive heat is detrimental to most organisms, including bumblebees. When temperatures exceed their tolerance, metabolic processes break down, leading to death. This is in contrast to cool temperatures, where organisms can simply slow down their activity.

The study also highlights the interconnectedness of bumblebee colonies. As "superorganisms," their survival depends on the collective ability to produce offspring. Even if some bumblebees can withstand the heat, the death of others, particularly larvae, can jeopardize the entire colony's future.

The findings underscore the urgency of addressing climate change and its impact on bumblebees and other pollinators. Protecting these vital creatures is crucial for maintaining healthy ecosystems and ensuring food security.