All plants and animals carry a natural chemical signature shaped by the environment in which they grow and feed. This signature comes from stable isotopes – naturally occurring forms of elements that differ slightly in mass but do not decay over time. The relative abundance of these isotopes varies predictably with factors such as climate, geography, and diet. Stable Isotope Ratio Analysis (SIRA) is a powerful analytical technique based on this principle. It measures these subtle differences in isotope ratios, allowing samples to be “fingerprinted” according to their origin. Over the past several decades, SIRA has been widely used to trace the production and movement of biological materials. This presentation introduces the principles behind stable isotopes and SIRA, and explores how the technique can be applied to identify insect pest pathways. Case studies include house flies and wood-boring beetles, such as the invasive Asian longhorn beetle and Ips typographus.
Tag Archives: insect invasions
An ‘Alien’ in Antarctica
A tiny flightless midge, Eretmoptera murphyi, accidentally introduced to Antarctica in the 1960s, has spread across Signy Island and now dominates the soil ecosystem. Its larvae feed on dead plant material, enriching the soil with nitrogen and changing conditions in ways that could help other species invade. Octavia’s research reveals these midge-altered soils also release more greenhouse gases, meaning this small insect could be quietly accelerating climate change in one of the planet’s most fragile environments.
Biological Recording 