The unknown known - A review of local ecological knowledge in relation to forest biodiversity conservation

Local ecological knowledge and the land use practices of forest resource users who rely on this form of knowledge play a crucial role for biodiversity conservation in managed forests. The understandings of, and approaches taken to analyze, such knowledge are diverse. To systematize the available knowledge, we conduct a review of 51 studies addressing local ecological knowledge (LEK) and forest biodiversity conservation practice. We analyze what specific kind of knowledge is considered, who holds the knowledge, how this knowledge is actively applied in practice and how it relates to biodiversity conservation. The review shows that local ecological knowledge and forest biodiversity conservation are linked through various socially shared aspects, such as values and norms, spiritual beliefs and perceptions of ecosystem functions and benefits as well as operational conditions, including livelihood strategies and economic constraints. While many of the reviewed studies evaluate local knowledge as holding great promise for biodiversity conservation, the conclusions regarding practical implications of including this knowledge into forest and conservation management are mixed. In particular, the interaction of traditional conservation paradigms rooted in local ecological knowledge and science-based modern paradigms is not thoroughly addressed. This applies especially to European countries, where research on local ecological knowledge is scattered. Drawing on these observations, we conclude that a greater focus on the ways in which societies in these countries can (re)generate, transform and apply local ecological knowledge can play a crucial role in integrating conservation objectives into forest management under changing environmental conditions.