1. Department of Mathematics, Indian Institute of Technology Ropar, Rupnagar 140 001, Punjab, India
2. Department of Evolutionary Biology and Environmental Studies, University of Zurich, 8057 Zurich, Switzerland
3. URPP Global Change and Biodiversity, University of Zurich, 8057 Zurich, Switzerland
4. Chaos and Complex Systems Research Laboratory, Department of Physics, University of Burdwan, Burdwan 713 104, West Bengal, India