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Patterns and Processes of Lantana Camara Persistence in South Indian Tropical Dry Forests

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Patterns and Processes of Lantana Camara Persistence in South Indian Tropical Dry Forests Patterns and processes of Lantana camara persistence in South Indian tropical dry forests Thesis submitted for the Degree of Doctor of Philosophy Thesis Submitted by Bharath Sundaram Reg No: 070900007 Thesis Submitted to Manipal University Manipal, 576104 Research carried out at The Academy for Conservation Science and Sustainability Science Ashoka Trust for Research in Ecology and the Environment (ATREE) Bangalore Acknowledgements I am privileged to have enjoyed the fellowship offered by many people during the course of my doctoral research. My endeavor would not have seen fruition but for the help provided by these people. Ankila Hiremath, my friend, philosopher, and guide. She has been a pillar of support throughout my studentship. Her constructive criticism and methodical thinking resulted in the improvement of all aspects of my work. Gladwin Joseph, member of my committee, for his unflagging encouragement. His keen eye for structure and detail has helped improve the way I write. Jagdish Krishnaswamy, member of my committee, for his valuable inputs at a stage when most of my ideas were half‐baked. His inputs on experimental design and data analyses are of great value to me. Siddhartha Krishnan, for his help in the development of the chapter on Soliga local knowledge. He piloted me through uncharted waters, right from the design and implementation stages to the writing of the chapter. The same chapter also saw considerable improvement due to Nitin Rai’s critical comments. Kavita Isvaran, for her patience and help with data analyses. My chapters on model selection to explain lantana invasions and on soil seed bank ecology would not be if not for her help. Devcharan Jathanna, black belt statistician and experiment designer, for his help and advice all the way through. M. C. Kiran, GIS analyst, for his help in assembling the GIS data that was the backbone of my work. R. Siddappa Setty, for sharing both his knowledge on BRT and his data on species distributions. His data set was invaluable in my research. Madhura Niphadkar, for making maps used in this thesis. N. A. Aravind’s substantial help during the thesis submission stage helped me jump successfully through many an administrative hoop. I greatly enjoyed the courses I took at ATREE, NCBS, and elsewhere, as part of my Ph.D. These courses provided much food for thought. Jagdish Krishnaswamy, Seema Purushothaman, Nitin Rai, Gladwin Joseph, Kartik Shanker, and Siddhartha Krishnan held courses at ATREE. Anindya Sinha and Mahesh Rangarajan taught courses at NCBS. I thank Ajith Kumar for letting me take these courses at NCBS. I also benefitted from the Statistics and Experimental design course conducted by Jason Tylianakis as part of the Association for Tropical Biology and Conservation meetings held in Malaysia and Thailand in 2007‐08. I thank Rhett Harrison and Tomasso Savini for helping me get to these meetings from Bangalore. My friends and colleagues at ATREE and elsewhere, Arundhati Das, Devcharan Jathanna, N. Samba Kumar, Robin Vijayan, Nandini Rajamani, Vivek Ramachandran, Kartik Shanker, Meera Anna Oommen, Nitin Rai, Mahesh Sankaran, Suhel Quader, Anirban Datta Roy, Ramesh Kannan, Ayesha Prasad, M. D. Madhusudan, Paramesha Mallegowda, Ravi Ramalingam, Dan Brockington, Ramesh Kannan, Samira Agnihotri, Muthatha Ramanathan, Pernille Sandemose, and C. Made Gowda were helpful in many ways during the course of my research. I enjoyed i their company, and enjoyed the many discussions I had with them about their research and mine. I offer my sincere apologies to Aarthi Sridhar, who has had to listen to first‐cut versions of almost all my conference presentations related to my lantana work. Whether she likes it or not, she now knows much more about lantana than she would like. The Writers’ Bloc was created during August 2010 by Nandini Rajamani as an emergency measure to provide space for jaded thesis writers to enjoy coffee and snacks, and maybe get some writing done on the side. The Bloc invigorated my thesis writing, and ignited thoughts of a post‐thesis‐submission life, which in turn pushed me to write more. When I was in New Delhi trying to get some writing done during May 2009, I came down with chicken pox, and was quarantined. Without Bansuri Taneja and Ankila’s help during this time— which largely involved providing company, meals, and reading material — I would have either gone mad due to boredom or starved to death. This thesis was written because I survived, and thanks to them. I would like to thank R. M Ray, Chief Wildlife Warden (retired) and R. Raju, Deputy Conservator of Forests (Chamrajnagar Wildlife Division), both of the Karnataka Forest Department, for facilitating my research in BRT. T. R. Gopi, Sindhu Damodaran, Saji Damodaran, Umesha, Sunil, Ramesh N., and Lakshmikanthaiah N. provided crucial administrative and logistical support at various times during my research. These individuals kept ATREE’s administrative machinery on a roll. The International Foundation for Science, Sweden, and the Department of Science and Technology, India funded my field research. Grants to ATREE from the Jamsetji Tata Trust and Noragric partly funded my fellowship. The BRT field station was my home for more than three years. Thanks to Renuka‐amma, D. Rajanna, and Made Gowda for making the BRT field station a pleasure to work from. Field work at BRT was always going to be a challenge because of the terrain, and because of the thick lantana growth in most places. I would not have made it through—literally and figuratively— without the help of D. Kethe Gowda, M. Jadeya, Jade Swamy, R. Madeva, Nanje Gowda, M. Kethe Gowda, Jadeya ‘Upendra’ Gowda, M. R. Made Gowda, and Kumbhe Gowda. I owe much to these individuals for their help and for their cheerfulness in the face of adversity. Much love to Amma, Appa, Sumi, Rakhi, and Chinna for all their love and support. ii Executive summary Invasive species have been recognized to be an important threat to biodiversity and ecosystem functioning. I examined the patterns of Lantana camara (hereafter, lantana) invasion and the effects of lantana invasion on native plant communities in a tropical dry forest in the Biligiri Rangaswamy Temple Wildlife Sanctuary (hereafter, BRT), Western Ghats, India. I then examined how patterns of lantana spread are related to factors such as disturbance (e.g., forest fires and historical habitat modification) and habitat structure. In order to link pattern with process, I investigated the role played by soil seed banks as a potential mechanism underlying lantana success in BRT. Lastly, I examined how local people perceive lantana invasions. I tabled results from both traditional ecological knowledge sources and scientific sources about the patterns and processes of lantana invasion and drew out implications for the future management of lantana-invaded landscapes. Data on the distribution of lantana and native species in 1997 came from an existing study. In 1997, the entire 540 km2 study area was overlaid with a 2-km grid to yield 134 cells, and an 80 m x 5 m plot was established in the centre of each grid cell. I re-visited the same set of plots in 2008 to arrive at the change in the density and distribution of lantana and native species. Additionally, I explored the effects of lantana density on the native woody species community, particularly diversity, abundance, evenness, size class distribution, and relative dominance. Over 11 years there was a tremendous increase in lantana abundance and density. Lantana was present in only 41% of plots inventoried in 1997, but by 2008 lantana had spread to 81 % of all plots. Lantana invasion was accompanied by a reduction in native species density and diversity. Lantana invasion was also accompanied by a reduction in evenness in the native community. In addition there was evidence for drastic reductions in the regenerating size classes of trees, suggesting that tree population declines may occur in the future. Lantana was found to be the most dominant species in BRT. The BRT landscape has experienced and is experiencing a variety of disturbances. Historical disturbance factors, such as selective- and clear-felling of trees, extraction of bamboo and grass iii resources, and slash-and-burn agriculture, could have created conditions favorable for lantana invasion. Contemporary disturbance factors, such as roads, and human-caused disturbance (e.g., collection of non-timber forest products or fuel-wood) may also play a role in driving lantana invasions. Lantana invasion could also be driven by an increase in fire frequency, since lantana resprouts in response to fire. Propagule pressure from sites already invaded by lantana could further enhance lantana invasion. Finally, lantana invasion would be influenced by the availability of suitable habitat. I modeled the rapid spread of lantana using explanatory variables such as historical habitat modification, current human disturbance, fire frequency, propagule pressure, and habitat suitability. Using an information-theoretic, model-selection approach, I focused the modeling exercise on the three distinct stages of biological invasion — arrival, establishment, and spread. Lantana arrival was best explained by propagule pressure, rather than disturbance factors or habitat suitability. Lantana establishment on the other hand, was limited by fire frequency. Lastly, I found that lantana spread was influenced largely by proximity to historical disturbance, such as old plantations. Management efforts aimed at controlling the invasion of lantana and of other potentially problematic invasives are limited by the lack of information on the mechanisms that may enhance their success. The ecology of soil seed banks is one such mechanism. I explore the role played by soil seed banks in enhancing the success of two common invasives in BRT — lantana and Chromolaena odorata (hereafter, Chromolaena). Results from this study indicate that the soil seed bank is saturated with seeds of lantana and Chromolaena vis-à-vis native species.
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