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Ecosystems are often under threat by invasive species which, through theirinvasion dynamics, create ecological networks to spread. We present preliminaryresults using a technique of GIS coupled with complex network analysis to modelthe movement and spread of Lantana Camara in Rajaji Tiger Reserve, India, whereprey species are being affected because of habitat degradation due to Lantanainvasion. Understanding spatio-temporal aspects of the spread mechanism areessential for better management in the region. The objective of the presentstudy is to develop insight into some key characteristics of the regulatorymechanism for lantana spread inside RTR. Lantana mapping was carried out byfield observations along multiple transects and plots and the data generatedwas used as input for MaxEnt modelling to identify land patches in the studyarea that are favourable for lantana growth. The patch information so obtainedis integrated with a raster map generated by identifying differenttopographical features in the study area which are favourable for lantanagrowth. The integrated data is analysed with a complex network perspective,where relatively dense potential lantana distribution patches are considered asvertices, connected by relatively sparse lantana continuities, identified asedges. The network centrality analysis reveal key patches in the study areathat play specialized roles in the spread of lantana in a large region. Hubs inthe lantana network are primarily identified as dry seasonal river beds andtheir management is proposed as a vital strategy to contain lantana invasion.The lantana network is found to exhibit small-world architecture with a wellformed community structure. We infer that the above properties of the lantananetwork have major contribution in regulating the rapid infestation and evenspread of the plant through the entire region of study.

A network theoretic study of potential movement and spread of Lantana camara in Rajaji Tiger Reserve, India