The shell of a Biggenden Banded Snail at Coalstoun Lakes National Park.
Photo Credit: The University of Queensland
Scientific Frontline: Extended "At a Glance" Summary: Snail Shells as Weather Time Capsules
The Core Concept: Researchers have discovered that the growth bands on snail shells can act as a natural archive of extreme weather events.
Key Distinction/Mechanism: By analyzing the oxygen and carbon stable isotopes within tiny samples of shell taken at millimeter intervals, scientists can track periods of rapid shell growth, which correspond to extreme rainfall events, rather than just annual wetness.
Origin/History: A 2026 study led by University of Queensland researchers examined a Biggenden banded snail (Figuladra bayensis) shell. The shell contained elevated radiocarbon from 1960s nuclear tests, allowing researchers to date its growth bands to a 4.5-year lifespan.
Major Frameworks/Components:
- High-Resolution Radiocarbon Dating: Used to determine the age of the shell and its individual growth bands.
- Stable Isotope Analysis: Measuring oxygen and carbon stable isotopes within the bands to understand the rainfall conditions the snail experienced.
- Growth Spurt Correlation: Linking periods of rapid shell growth to the extreme rainfall immediately following specific cyclones (e.g., Cyclone Marcia in 2015 and Cyclone Debbie in 2017).
Branch of Science: Earth Science, Environmental Science, Paleoclimatology.
Future Application: Scientists plan to analyze shells found in different sediment layers to reconstruct the paths and frequencies of prehistoric cyclones, extending meteorological data further back in time.
Why It Matters: This method provides a novel, biological tool for mapping extreme weather events prior to modern meteorological records, offering valuable insights into historical climate patterns.
A University of Queensland study has shown that snails carry weather records on their shells that could be used to map prehistoric cyclones.
A project led by School of the Environment researchers examined the rings on the shell of a Biggenden banded snail (Figuladra bayensis) collected from Coalstoun Lakes National Park in southeast Queensland, linking its bands to weather records.
Dr. Nicholas Patton said tiny samples of the shell taken at millimeter intervals revealed the age of the snail, when it lived, and the weather during its lifetime.
“We used high-resolution radiocarbon dating to determine the age of the growth bands in the shell,” Dr. Patton said.
“It contained elevated levels of radiocarbon from the nuclear tests in Australia in the 1960s, meaning we could date the growth bands and reveal that the snail had lived for about 4.5 years.
“Analyzing the oxygen and carbon stable isotopes of the different bands revealed insights into the rainfall the snail experienced.
“What we saw was that the shell did not grow continuously during the snail’s life; there were periods of rapid growth separated by periods of little or no growth.”
Honorary Professor Jamie Shulmeister said the team initially expected the rapid growth phases to correspond to years with heavier rainfall, which would make more food available for the snail.
“But the results showed the snail was responding to extreme rainfall events rather than annual wetness,” Honorary Professor Shulmeister said.
“Because we knew when the snail lived, the growth spurts could be linked to periods immediately following cyclones in 2015 and 2017.
“Severe Tropical Cyclone Marcia and Tropical Cyclone Debbie both caused extreme rainfall within Coalstoun Lakes National Park.
“It shows that snail shells could be used to map extreme weather events for periods before modern meteorological records.
“It was surprising and quite exciting that the humble snail could be a tool to reconstruct the paths of past cyclones, even in prehistoric times.”
The researchers' next step is to test the approach.
“If we are able to find shells within different layers of sediment deposits, we can combine the individual shell records to extend this information further back in time,” Dr. Patton said.
Collaboration and Acknowledgments: Collaboration and Acknowledgments The research was completed with Professor Melanie Leng of the British Geological Survey and the University of Nottingham, and Dr. Quan Hua from the Australian Nuclear Science and Technology Organisation (ANSTO).
Published in journal: The Holocene
Authors: Nicholas R. Patto, James Shulmeister, Melanie J. Leng, Matthew Jones, Quan Hua, and Jennifer R. Kielhofer
Source/Credit: University of Queensland
Edited by: Scientific Frontline
Reference Number: es091426_02
