How did warmer climates change food sources during the Mesolithic Period?

During the Mesolithic Period, rising temperatures and increased humidity significantly altered the environment, leading to major shifts in available food sources as the climate transitioned from the extreme conditions of the last Pleistocene glaciation.1

As the climate warmed, the large animals of the Ice Age, such as mammoths and bison, either went extinct or migrated northward in search of colder conditions. In their place, European forests became dominated by smaller game, including wild cattle, pigs, and deer.12

The changing landscape also expanded the variety of plant and aquatic resources:
* Plant Life: Increased warmth and humidity fostered the growth of forests, providing nuts such as hazelnuts, as well as various berries.1
* Aquatic Resources: The retreat of ice sheets and rising sea levels created new coastal and wetland environments. Humans increasingly exploited a wide range of fish, such as salmon and carp, as well as shellfish and waterfowl.13

These environmental shifts necessitated more diverse subsistence strategies, leading Mesolithic groups to develop specialized tools—such as fishhooks, nets, and traps—to efficiently harvest these seasonally available resources.143