Journal Article Research Support, U.S. Gov't, Non-P.H.S. hydroperiod Arctic amplification Cambio climático Rana sylvatica Research Support, Non-U.S. Gov't Subarctic adaptation amphibian amphibian decline climate change constructed ponds declinación de anfibios estanques construidos fragmentación fragmentation hidroperíodo human footprint index modelo estado-espacio monitoreo monitoring phenotypic plasticity restauración restoration state-space model temporary wetlands índice de huella ecológica humana