Universidade Ben-Gurion researchers from Negev, in Israel, published a critical analysis that challenges the interpretation of a previous study on electrical signals in trees during a partial solar eclipse. Ariel Novoplansky and Hezi Yizhaq argue that the activity observed in Norway spruce trees (Picea abies) in
The recorded phenomenon involved synchronized bioelectrical variations between a few monitored trees. The new assessment points out that a lightning storm and a drop in temperature occurred in the same period and explains the patterns detected in a simpler and more consistent way with established knowledge about plant responses.
The criticism highlights that common environmental factors trigger electrical reactions in plants. Esses natural events offer a more grounded interpretation than hypotheses about anticipatory coordination.
- Monitoring was limited to three live trees and five stumps.
- Peak activity was recorded 14 hours before the maximum eclipse.
- Light reduction was only 10.5% for two hours.
- Light intensity remained twice above that required for photosynthesis.
Phenomenon recorded in the Dolomites
A previous study monitored trees in a Dolomites forest, northeast of Itália, during the partial solar eclipse of October 25, 2022. Sensores attached to trunks, roots and branches detected a synchronized increase in bioelectrical activity, with older trees showing more intense variations.
The original authors suggested that the pattern indicated transmission of accumulated experience between individuals in the forest. Essa coordination would have allowed collective preparation for the temporary environmental change caused by the eclipse.
Criticisms of the original interpretation
Novoplansky and Yizhaq question the causality attributed to the eclipse on several points. Eles note that partial solar eclipses vary in trajectory, magnitude, and duration, making the use of memory of past events for accurate prediction unlikely.
Gravitational variations associated with the phenomenon are minimal and comparable to those of a common new moon. Não there is a known mechanism that allows trees to detect such changes early enough to coordinate responses.
The recorded luminous reduction would not justify a significant collective reaction. The event lasted a few hours and did not substantially interfere with the trees’ physiological processes.
Influence of meteorological conditions
A passing storm with nearby electrical discharges temporally coincided with the increase in signaling. Pesquisas previous studies demonstrate that lightning and sudden changes in temperature provoke rapid electrical responses in plants.
Luminosity drop due to cloud cover in the region occurs with a frequency and amplitude greater than that of the observed eclipse. Essas natural fluctuations already trigger similar physiological adjustments without the need for anticipatory coordination.
Known electrical responses in plants
Plants present electrical signals in response to various environmental stimuli. Mechanical Ferimentos, herbivore attack and drought signals in the soil activate action potentials that propagate quickly.
These mechanisms serve to adjust processes such as stomatal closure or release of defensive compounds. Transmission can occur via vascular tissues or mycorrhizal networks in the soil.
- Response to touch in Mimosa pudica causes immediate leaf closure.
- Attack by caterpillars on tomato plants generates signals that activate defense genes in distant leaves.
- Initial soil drought causes adjustments before visible symptoms of water stress.
- Nearby atmospheric discharges induce measurable variations in electrical potential.
Limitations of original monitoring
The initial study was based on a small sample of individuals in the forest. Apenas three live trees and five stumps provided data, which restricts generalizations about collective behavior.
Recorded variations may reflect individual responses to local stimuli rather than coordinated communication. The lack of simultaneous control of meteorological variables makes it difficult to isolate the eclipse as a single cause.
Field study on plant signals
The investigation of electrical signals in plants remains in the early stages of development. Descobertas recent studies reveal greater complexity than previously imagined in plant physiological interactions.
Controversies such as the present one highlight the need for caution in interpreting correlations. Explicações based on known mechanisms gain priority over hypotheses that require extraordinary conceptual leaps.
Environmental factors on the day of the eclipse
Meteorological records indicate the passage of a cold front with intense rain in the Dolomites region on October 25, 2022. Descargas electrical strikes occurred at distances compatible with influence on local vegetation.
Ambient temperatures dropped significantly hours before the eclipse maximum. Ambas conditions have already demonstrated the ability to change electrical potentials in tree species.
The combination of high humidity, wind and proximity to lightning offers a coherent explanation for the observed spikes. Esses elements act more directly and immediately than moderate light variations.
Implications for future research
The controversy reinforces the importance of considering multiple environmental variables in field studies. Simultaneous Monitoramento of local climatic conditions becomes essential to distinguish real causes.
The field of plant electrophysiology remains promising for understanding adaptive responses. Descobertas futures will depend on robust methodologies that avoid speculative interpretations.
