Ecosystems are an assembly of a wide range of species that interact with one another, and with their environment, at relatively local scales. They exhibit self-organized patterns and maintain stability at much larger spatiotemporal scales. We are interested in understanding the patterns and dynamics of ecosystems, what causes them, how they are influenced by variations (seasonal/stochastic) in external drivers [1,2] and to device predictive tools [3,4]. We do this by employing/extending simple theoretical tools from statistical physics and applied mathematics, and by suitably testing those with empirical/laboratory data.
Ecosystems are naturally exposed to gradual changes in their external conditions and these typically results in a proportionate smooth response in their state. Occasionally, ecosystems can undergo abrupt and irreversible changes. Well studied examples include algal blooms in lakes or oceans, coral bleaching, or desertification in semi-arid forests. Many of these dramatic changes can happen by small changes in external drivers. Such abrupt changes, also referred to as catastrophic regime shifts/critical transitions, can lead to enormous loss of ecosystem services to humans. In this context, we are interested in devising early warning signals, or leading indicators, of abrupt transitions, using mathematical models [3,4,14,15], developing statistical methods [5,7,12], and testing in the real world [9,10,11].
 Majumder, Sabiha, Krishnapriya Tamma, Sriram Ramaswamy, and Vishwesha Guttal.Inferring critical points of ecosystem transitions from spatial data. bioRxiv
 Sumithra Sankaran, Sabiha Majumder, Ashwin Viswanathan and Vishwesha Guttal, Patchiness and scale-free correlations: characterising criticality in ecosystems, bioRxiv.
 Alexandre Génin*, Sabiha Majumder*, Sumithra Sankaran*, Florian D Schneider, Alain Danet, Miguel Berdugo, Vishwesha Guttal, Sonia Kefi, 2018, Indicators of regime shifts in ecological systems with spatially heterogeneous stressors, In Press, Ecological Indicators, (*These authors contributed equally to this work).
 Sumithra Sankaran*, Sabiha Majumder*, Sonia Kefi, Vishwesha Guttal, 2018, Implications of being discrete and spatial for detecting early warning signals of regime shifts, Ecological Indicators (*These authors contributed equally to this work).
 Chen Ning, Kailiang Yu, C Jayaprakash, Vishwesha Guttal, 2018, Rising variability, not slowing down, as a leading indicator of a stochastically driven abrupt transition in a dryland ecosystem, The American Naturalist, 191: E1 E14, Data and Codes via Dryad. There is also a Lay summary.
 Stephanie Eby*, Amit Agrawal*, Sabiha Majumder, Andew Dobson and Vishwesha Guttal, 2017, Alternative stable states and spatial indicators of critical slowing down along a spatial gradient in a savanna ecosystem, Global Ecology and Biogeography, DOI: http://dx.doi.org/10.1111/geb.12570. Codes and Data. PDF (*These authors contributed equally to this work).
 Vishwesha Guttal, Srinivas Raghavendran, Nikunj Goel, and Quentin Hoarau. Lack of Critical Slowing Down Suggests that Financial Meltdowns Are Not Critical Transitions, yet Rising Variability Could Signal Systemic Risk, PLoS ONE, 11(1): e0144198. PDF
 Amit Badhuri, Srinivas Raghavendra, Vishwesha Guttal, 2015, On the Systemic Fragility of Finance Led Growth, Metroeconomica, 66: 158-186. PDF
 Sonia Kefi*, Vishwesha Guttal*, William A Brock, Stephen R Carpenter, Aaron M Ellison, Valerie N Livina, David A Seekel, Marten Scheffer, Egbert H van Nes, Vasilis Dakos, 2014, Early warning signals of ecological transitions: Methods for spatial patterns, PLoS ONE 9(3): e92097. doi:10.1371/journal.pone.0092097 (*These authors contributed equally to this work).(*These authors contributed equally to this work).
 Vishwesha Guttal*, C. Jayaprakash*, Omar P. Tabbaa*, 2013, Robustness of early warning signals of regime shifts in time-delayed ecological models, Theoretical Ecology, Online Early (*All authors contributed equally to this manuscript and the names are listed in alphabetical order).
 Vasilis Dakos, Stephen R. Carpenter, William A. Brock, Aaron M. Ellison, Vishwesha Guttal, Anthony R. Ives, Sonia Kefi, Valerie Livina, David A. Seekell, Egbert H. van Nes, Marten Scheffer, 2012, Methods for detecting early warnings of critical transitions in time series: Illustrated using simulated ecological data. PLoS ONE. 7(7): e41010. PDF
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