The spectral species concept: lights and shadows of a challenging idea

Duccio Rocchini1, Maria J. Santos2, Susan Ustin3, Jean-Baptiste Feret4, Greg Asner5, Carl Beierkuhnlein6, Michele Dalponte7, Hannes Feilhauer8, Giles M Foody9, Gary N Geller10, Thomas W Gillespie11, Kate S. He12, David Kleijn13, Pedro J. Leitão14, Marco Malavasi15, Jana Müllerová16, Vı́tězslav Moudrý17, Harini Nagendra18, Signe Normand19, Carlo Ricotta20, Michael E Schaepman21, Sebastian Schmidtlein22, Andrew K Skidmore23, Petra Šímová17, Michele Torresani24, Philip A Townsend25, Woody Turner26, Petteri Vihervaara27, Martin Wegmann28 and Jonathan Lenoir29, (1)Organization Not Listed, Washington, DC, United States, (2)University of Zurich, Department of Geography, Zurich, Switzerland, (3)Univ California Davis, Davis, CA, United States, (4)IRSTEA, Antony Cedex, France, (5)Arizona State University, Center for Global Discovery and Conservation Science, Tempe, United States, (6)University of Bayreuth, Bayreuth, Germany, (7)Research and Innovation Centre - Fondazione Edmund Mach, Sustainable Agro-ecosystems and Bioresources Department, San Michele all'Adige, Italy, (8)University of Erlangen-Nuremberg, Erlangen, Germany, (9)University of Nottingham, School of Geography, Nottingham, United Kingdom, (10)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (11)University of California Los Angeles, Geography, Los Angeles, CA, United States, (12)Murray State University, Murray, United States, (13)Wageningen University, Wageningen, Netherlands, (14)University of Leipzig, Leipzig, Germany, (15)Czech University of Life Sciences Prague, Prague, Czech Republic, (16)The Czech Acad. Sciences, Pruhonice, Czech Republic, (17)Czech University of Life Sciences, Prague, Czech Republic, (18)Azim Premji University, Centre for Climate Change and Sustainability, Bangalore, India, (19)Aarhus University, Aarhus, Denmark, (20)University of Rome "La Sapeinza", Rome, Italy, (21)University of Zurich, Department of Geography, Remote Sensing Laboratories, Zurich, Switzerland, (22)Karlsruhe Institute of Technology, Karlsruhe, Germany, (23)University of Twente, Faculty of Geo-Information Science and Earth Observation (ITC), Enschede, Netherlands, (24)Università Libera di Bolzano, Bolzano, Italy, (25)University of Wisconsin Madison, Forest and Wildlife Ecology, Madison, United States, (26)NASA Headquarters, Washington, DC, United States, (27)Finnish Environment Institute, Biodiversity Centre, Helsinki, Finland, (28)EPFL, Lausanne, Switzerland, (29)Université de Picardie Jules Verne, Amiens, France