Winter mortality & temperature variations and Varroa mites

 

Science updates:

Winter mortality & temperature variations and Varroa mites

 

The study examines the causal relationship between honey bee (Apis mellifera) winter mortality and environmental factors such as temperature variations and Varroa mite density. The research, conducted in a Central European apiary from 1991 to 2023, reveals consistent mortality patterns across years, with four distinct clusters of year-specific mortality trajectories identified. However, no significant differences were found in seasonal temperatures or Varroa destructor density among these clusters.

 

The study employs generalized additive mixed models (GAMM) to analyze individual bee mortality rates and structural equation models (SEM) to explore the causal network linking environmental conditions to bee mortality and honey production.

 

The results indicate that increased winter mortality is associated with lower winter temperatures and higher autumn infestations of Varroa mites. Spring and autumn temperatures, along with the abundance of bees and brood, influence the density of Varroa mites. While winter mortality does not significantly affect honey yields in subsequent seasons, spring bee abundance is a critical determinant of both spring brood abundance and honey production.

 

The research underscores the importance of seasonal temperatures and Varroa mite density in predicting winter mortality and colony productivity. It suggests that beekeepers can use these factors as indicators to implement protective measures during critical winter periods. The study's findings contribute to the understanding of honey bee colony resilience and the broader impacts of climate change on pollinator health and agricultural services.

 

Reference:

Smoliński, S., & Glazaczow, A. (2024). Causal network linking honey bee (Apis mellifera) winter mortality to temperature variations and Varroa mite density. Science of The Total Environment, 176245..

 

 

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