Frontiers in Feeding-Trace Fossil Research
- Why focus on damage made while the plant was alive?
- We focus on feeding traces made while a plant was alive because only herbivory affects plant survival and reproduction, driving coevolution between plants and herbivores, whereas damage after death (detritivory) usually has no evolutionary consequence for the plant.
When animals feed on living plant tissue, the interaction is called herbivory. When dead plant material (such as fallen leaves) is eaten, it is generally called detritivory, or decomposition-based feeding. This distinction matters because only herbivory can directly affect a plant’s survival and reproduction. That means herbivory can drive evolutionary change in plants (such as tougher leaves or chemical defenses) and in herbivores (such as new feeding strategies)—a long-term process of coevolution. In contrast, feeding that occurs after a leaf has died usually does not influence the evolution of that individual plant, because the damage happens too late to affect its fitness. For this reason, researchers often focus on traces that formed while the plant was still alive, especially when they want to understand how plants and herbivores shaped each other’s evolution over deep time.
What Can We Learn from Fossil Feeding Traces?
Fossil feeding traces are more than just “bite marks.” They help scientists answer big questions about the history of life on land. Fossil feeding traces are more than just “bite marks.” They are key clues for understanding the history of terrestrial ecosystems. Past research has used feeding-trace fossils to investigate questions such as the following.
How insect herbivory responds to climate change
By comparing damage before and after warming or cooling events, researchers can see how plant–insect interactions shifted under changing climates.
When specific plant–insect relationships began
Some feeding styles (Damage Types) are linked to particular groups of plants. Fossils can show when these associations first appeared.
How mass extinctions affected ecosystems
Changes in feeding diversity across extinction events reveal how insect–plant interactions collapsed, survived, or recovered.
When insect herbivory itself originated
The earliest feeding traces provide evidence for when insects first began eating plants on land.
By studying these traces, scientists reconstruct not only who ate what—but how entire ecosystems evolved through hundreds of millions of years.