Diachronic changes in local food heritage: the ethnobiology of wild foods in central Tuscany

Abstract Background Ethnobiological and gastronomic knowledge of wild foods has long-shaped rural traditions in Italy. In Valdera, Central Tuscany, foraging has been especially important among older generations. This study explores shifts in wild food knowledge and practices over two decades, comparing data collected in 2024 with findings from a 2004 study. Methods The study was conducted in Valdera, Central Tuscany, through structured interviews with local residents. Using the same methodological framework as a 2004 survey, participants were asked about wild food plants, mushrooms, and wild animals they recognized, used, and how they incorporated them into traditional dishes. This approach enabled a diachronic comparison of taxa diversity, plant families, and culinary applications. Special attention was given to how social and ecological dynamics, such as aging populations, urbanization, and changing educational backgrounds, influenced the retention or erosion of local traditional knowledge over the past two decades. Results A total of 86 folk taxa of wild plants were documented. The findings reveal a decline in the number of recorded taxa, from 59 folk taxa and 28 botanical families in 2004 to 57 folk taxa and 26 families in 2024. Despite the samples including a similar number of informants, the decrease in used folk taxa is significant, with several species absent in 2024, including notable wild greens taxa such as Capsella, Coleostephus, Clematis, Daucus, Epilobium, Helosciadium, Lactuca, Muscari, Rubus, Scabiosa, Potentilla, and Viola spp., as well as a few wild seasoning plants such as Allium roseum, Ammi, Juniperus, and Thymus spp. and wild snack species (Gladiolus, Sulla, Oxalis, Lamium spp.). Shifts in plant family diversity and culinary applications were observed, with a decline in the use of wild leafy plants, wild seasoning plants, and wild plant snacks, possibly associated with a reduced role of women in foraging wild greens and less exposure to nature, i.e., fewer activities done into natural environments such as shepherding and/or collection of wild snacks by children and teenagers. A similar trend was observed in mushroom and animal foraging and hunting, where the interviewees could recall details about 24 taxa of food mushrooms and 62 taxa of wild animals, as well as their culinary transformations, which were often related to the past and their younger lives. The analysis revealed that the age group affects knowledge about local wild plants, mushrooms, and animals. While higher education was linked to better systematization of botanical knowledge, individuals with an agricultural background showed significantly greater practical familiarity with plant uses. Conclusions These findings emphasize how traditional plant knowledge is increasingly threatened by social and ecological changes, underscoring the importance of developing conservation strategies that combine both cultural heritage and environmental sustainability.