Neolithic pastoralism and plant community interactions at high altitudes of the Pyrenees, southern Europe Julián-Posada Irene Gil-Romera Graciela Garcés-Pastor Sandra Heintzman Peter D. Gómez Daniel Fillat Federico Moreno Ana Lara-Recuero Javier Bover Pere Montes Lourdes Universidad de Zaragoza Sierra Alejandro Valero-Garcés Blas Alsos Inger G. González-Sampériz Penélope 2025 research-article