Imperial College London

Dr Samraat Pawar

Faculty of Natural SciencesDepartment of Life Sciences (Silwood Park)

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 2213s.pawar CV

 
 
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Location

 

2.4KennedySilwood Park

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Summary

 

Publications

Publication Type
Year
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37 results found

Pawar S, Dell AI, Lin T, Wieczynski DJ, Savage VMet al., Interaction dimensionality scales up to generate bimodal consumer-resource size-ratio distributions in ecological communities, Frontiers in Ecology and Evolution, ISSN: 2296-701X

JOURNAL ARTICLE

Rund SSC, Braak K, Cator L, Copas K, Emrich SJ, Giraldo-Calderón GI, Johansson MA, Heydari N, Hobern D, Kelly SA, Lawson D, Lord C, MacCallum RM, Roche DG, Ryan SJ, Schigel D, Vandegrift K, Watts M, Zaspel JM, Pawar Set al., 2019, MIReAD, a minimum information standard for reporting arthropod abundance data., Sci Data, Vol: 6

Arthropods play a dominant role in natural and human-modified terrestrial ecosystem dynamics. Spatially-explicit arthropod population time-series data are crucial for statistical or mathematical models of these dynamics and assessment of their veterinary, medical, agricultural, and ecological impacts. Such data have been collected world-wide for over a century, but remain scattered and largely inaccessible. In particular, with the ever-present and growing threat of arthropod pests and vectors of infectious diseases, there are numerous historical and ongoing surveillance efforts, but the data are not reported in consistent formats and typically lack sufficient metadata to make reuse and re-analysis possible. Here, we present the first-ever minimum information standard for arthropod abundance, Minimum Information for Reusable Arthropod Abundance Data (MIReAD). Developed with broad stakeholder collaboration, it balances sufficiency for reuse with the practicality of preparing the data for submission. It is designed to optimize data (re)usability from the "FAIR," (Findable, Accessible, Interoperable, and Reusable) principles of public data archiving (PDA). This standard will facilitate data unification across research initiatives and communities dedicated to surveillance for detection and control of vector-borne diseases and pests.

JOURNAL ARTICLE

Kontopoulos DG, van Sebille E, Lange M, Yvon-Durocher G, Barraclough T, Pawar Set al., 2018, Phytoplankton thermal responses adapt in the absence of hard thermodynamic constraints

To better predict how populations and communities respond to climatic temperature variation, it is necessary to understand how the shape of the response of fitness-related traits to temperature evolves (the thermal performance curve). Currently, there is disagreement about the extent to which the evolution of thermal performance curves is constrained. One school of thought has argued for the prevalence of thermodynamic constraints through enzyme kinetics, whereas another argues that adaptation can - at least partly - overcome such constraints. To shed further light on this debate, we perform a phylogenetic meta-analysis of the thermal performance curve of growth rate of phytoplankton - a globally important functional group -, controlling for potential environmental effects. We find that thermodynamic constraints have a minor influence on the shape of the curve. In particular, we detect a very weak increase of the maximum curve height with the temperature at which the curve peaks, suggesting a weak "hotter-is-better" constraint. Also, instead of a constant thermal sensitivity of growth across species, as might be expected from strong constraints, we detect phylogenetic signal in this as well as all other curve parameters. Our results suggest that phytoplankton thermal performance curves adapt to thermal environments largely in the absence of hard thermodynamic constraints.

WORKING PAPER

Kissling WD, Walls R, Bowser A, Jones MO, Kattge J, Agosti D, Amengual J, Basset A, van Bodegom PM, Cornelissen JHC, Denny EG, Deudero S, Egloff W, Elmendorf SC, Alonso Garcia E, Jones KD, Jones OR, Lavorel S, Lear D, Navarro LM, Pawar S, Pirzl R, Rueger N, Sal S, Salguero-Gomez R, Schigel D, Schulz K-S, Skidmore A, Guralnick RPet al., 2018, Towards global data products of Essential Biodiversity Variables on species traits, NATURE ECOLOGY & EVOLUTION, Vol: 2, Pages: 1531-1540, ISSN: 2397-334X

JOURNAL ARTICLE

Garcia-Carreras B, Sal S, Padfield D, Kontopoulos D-G, Bestion E, Schaum C-E, Yvon-Durocher G, Pawar Set al., 2018, Role of carbon allocation efficiency in the temperature dependence of autotroph growth rates, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 115, Pages: E7361-E7368, ISSN: 0027-8424

JOURNAL ARTICLE

Zheng JX-S, Pawar S, Goodman DFM, 2018, Graph Drawing by Stochastic Gradient Descent., IEEE Trans Vis Comput Graph

A popular method of force-directed graph drawing is multidimensional scaling using graph-theoretic distances as input. We present an algorithm to minimize its energy function, known as stress, by using stochastic gradient descent (SGD) to move a single pair of vertices at a time. Our results show that SGD can reach lower stress levels faster and more consistently than majorization, without needing help from a good initialization. We then show how the unique properties of SGD make it easier to produce constrained layouts than previous approaches. We also show how SGD can be directly applied within the sparse stress approximation of Ortmann et al. [1], making the algorithm scalable up to large graphs.

JOURNAL ARTICLE

Bestion E, Garcia-Carreras B, Schaum C-E, Pawar S, Yvon-Durocher Get al., 2018, Metabolic traits predict the effects of warming on phytoplankton competition, ECOLOGY LETTERS, Vol: 21, Pages: 655-664, ISSN: 1461-023X

JOURNAL ARTICLE

Kontopoulos D-G, Garcia-Carreras B, Sal S, Smith TP, Pawar Set al., 2018, Use and misuse of temperature normalisation in meta-analyses of thermal responses of biological traits, PEERJ, Vol: 6, ISSN: 2167-8359

JOURNAL ARTICLE

Rizzuto M, Carbone C, Pawar S, 2018, Foraging constraints reverse the scaling of activity time in carnivores, NATURE ECOLOGY & EVOLUTION, Vol: 2, Pages: 247-+, ISSN: 2397-334X

JOURNAL ARTICLE

Schaum C-E, Barton S, Bestion E, Buckling A, Garcia-Carreras B, Lopez P, Lowe C, Pawar S, Smirnoff N, Trimmer M, Yvon-Durocher Get al., 2017, Adaptation of phytoplankton to a decade of experimental warming linked to increased photosynthesis, NATURE ECOLOGY & EVOLUTION, Vol: 1, ISSN: 2397-334X

JOURNAL ARTICLE

Woodward G, Bonada N, Brown LE, Death RG, Durance I, Gray C, Hladyz S, Ledger ME, Milner AM, Ormerod SJ, Thompson RM, Pawar Set al., 2016, The effects of climatic fluctuations and extreme events on running water ecosystems, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 371, ISSN: 0962-8436

JOURNAL ARTICLE

Pawar S, Dell AI, Savage VM, Knies JLet al., 2016, Real versus Artificial Variation in the Thermal Sensitivity of Biological Traits, AMERICAN NATURALIST, Vol: 187, Pages: E41-E52, ISSN: 0003-0147

JOURNAL ARTICLE

Gibert JP, Dell AI, DeLong JP, Pawar Set al., 2015, Scaling-up Trait Variation from Individuals to Ecosystems, ADVANCES IN ECOLOGICAL RESEARCH, VOL 52: TRAIT-BASED ECOLOGY - FROM STRUCTURE TO FUNCTION, Editors: Pawar, Woodward, Dell, Publisher: ELSEVIER ACADEMIC PRESS INC, Pages: 1-17

BOOK CHAPTER

Pawar S, 2015, The Role of Body Size Variation in Community Assembly, ADVANCES IN ECOLOGICAL RESEARCH, VOL 52: TRAIT-BASED ECOLOGY - FROM STRUCTURE TO FUNCTION, Vol: 52, Pages: 201-248, ISSN: 0065-2504

JOURNAL ARTICLE

Johnson LR, Ben-Horin T, Lafferty KD, McNally A, Mordecai E, Paaijmans KP, Pawar S, Ryan SJet al., 2015, Understanding uncertainty in temperature effects on vector-borne disease: a Bayesian approach, ECOLOGY, Vol: 96, Pages: 203-213, ISSN: 0012-9658

JOURNAL ARTICLE

Pawar S, Dell AI, Savage VM, 2015, From metabolic constraints on individuals to the eco-evolutionary dynamics of ecosystems, Aquat. Funct. Biodivers. An Eco-Evolutionary Approach, Editors: Belgrano, Woodward, Jacob, Publisher: Elsevier, Pages: In Press-In Press

BOOK CHAPTER

Pawar S, 2015, The role of body size variation in community assembly, Adv. Ecol. Res., Vol: 52

JOURNAL ARTICLE

Tang S, Pawar S, Allesina S, 2014, Correlation between interaction strengths drives stability in large ecological networks, ECOLOGY LETTERS, Vol: 17, Pages: 1094-1100, ISSN: 1461-023X

JOURNAL ARTICLE

Pawar S, 2014, Why are plant-pollinator networks nested?, SCIENCE, Vol: 345, Pages: 383-383, ISSN: 0036-8075

JOURNAL ARTICLE

Dell AI, Pawar S, Savage VM, 2014, Temperature dependence of trophic interactions are driven by asymmetry of species responses and foraging strategy, JOURNAL OF ANIMAL ECOLOGY, Vol: 83, Pages: 70-84, ISSN: 0021-8790

JOURNAL ARTICLE

Dell AI, Pawar S, Savage VM, 2013, The thermal dependence of biological traits, Ecology, Vol: 94, Pages: 1205-1206, ISSN: 0012-9658

JOURNAL ARTICLE

Pawar S, Dell AI, Savage VM, 2013, Does consumption rate scale superlinearly? Reply, NATURE, Vol: 493, Pages: E2-E3, ISSN: 0028-0836

JOURNAL ARTICLE

Mordecai EA, Paaijmans KP, Johnson LR, Balzer C, Ben-Horin T, Moor E, McNally A, Pawar S, Ryan SJ, Smith TC, Lafferty KDet al., 2013, Optimal temperature for malaria transmission is dramatically lower than previously predicted, ECOLOGY LETTERS, Vol: 16, Pages: 22-30, ISSN: 1461-023X

JOURNAL ARTICLE

Johnson LR, Lafferty K, McNally A, Mordecai E, Paaijmans K, Pawar S, Ryan SJet al., 2013, Mapping the Distribution of Malaria: current methods and considerations, Infectious Disease Modelling, Hoboken, N.J., Publisher: Wiley-Interscience, Pages: In Press-In Press

BOOK CHAPTER

Pawar S, Dell AI, Savage VM, 2012, Dimensionality of consumer search space drives trophic interaction strengths, NATURE, Vol: 486, Pages: 485-489, ISSN: 0028-0836

JOURNAL ARTICLE

Dell AI, Pawar S, Savage VM, 2011, Systematic variation in the temperature dependence of physiological and ecological traits, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 108, Pages: 10591-10596, ISSN: 0027-8424

JOURNAL ARTICLE

Pawar S, 2009, Community assembly, stability and signatures of dynamical constraints on food web structure, JOURNAL OF THEORETICAL BIOLOGY, Vol: 259, Pages: 601-612, ISSN: 0022-5193

JOURNAL ARTICLE

Pawar S, Koo MS, Kelley C, Ahmed MF, Chaudhuri S, Sarkay Set al., 2007, Conservation assessment and prioritization of areas in Northeast India: Priorities for amphibians and reptiles, BIOLOGICAL CONSERVATION, Vol: 136, Pages: 346-361, ISSN: 0006-3207

JOURNAL ARTICLE

Pawar SS, Birand AC, Ahmed MF, Sengupta S, Raman TRSet al., 2007, Conservation biogeography in North-east India: hierarchical analysis of cross-taxon distributional congruence, DIVERSITY AND DISTRIBUTIONS, Vol: 13, Pages: 53-65, ISSN: 1366-9516

JOURNAL ARTICLE

Biswas S, Pawar SS, 2006, Phylogenetic tests of distribution patterns in South Asia: towards an integrative approach, JOURNAL OF BIOSCIENCES, Vol: 31, Pages: 95-113, ISSN: 0250-5991

JOURNAL ARTICLE

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