1. School of Mathematical Science, Yangzhou University, Si Wang Ting Road, Yangzhou 225002, People's Republic of China
2. Department of Mathematics and Mathematical Statistics, Umeå University, 90187 Umeå, Sweden
3. Center for Macroecology, Evolution and Climate, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen Ø, Denmark
4. Systemic Conservation Biology, J. F. Blumenbach Institute of Zoology and Anthropology, University of Göttingen, 37073 Göttingen, Germany
5. National Institute of Aquatic Resources, Technical University of Denmark, Building 202, 2800 Kgs. Lyngby, Denmark
6. Center for Ocean Life, Technical University of Denmark, Building 202, 2800 Kgs. Lyngby, Denmark