Tropical rainforest bird community structure in relation to altitude, tree species composition, and null models in the Western Ghats, India

Studies of species distributions on elevational gradients are essential to understand principles of community organisation as well as to conserve species in montane regions. This study examined the patterns of species richness, abundance, composition, range sizes, and distribution of rainforest birds at 14 sites along an elevational gradient (500-1400 m) in the Kalakad-Mundanthurai Tiger Reserve (KMTR) of the Western Ghats, India. In contrast to theoretical expectation, resident bird species richness did not change significantly with elevation although the species composition changed substantially (<10% similarity) between the lowest and highest elevation sites. Constancy in species richness was possibly due to relative constancy in productivity and lack of elevational trends in vegetation structure. Elevational range size of birds, expected to increase with elevation according to Rapoport's rule, was found to show a contrasting inverse U-shaped pattern because species with narrow elevational distributions, including endemics, occurred at both ends of the gradient (below 800 m and above 1,200 m). Bird species composition also did not vary randomly along the gradient as assessed using a hierarchy of null models of community assembly, from completely unconstrained models to ones with species richness and range-size distribution restrictions. Instead, bird community composition was significantly correlated with elevation and tree species composition of sites, indicating the influence of deterministic factors on bird community structure. Conservation of low- and high-elevation areas and maintenance of tree species composition against habitat alteration are important for bird conservation in the southern Western Ghats rainforests.Comment: 36 pages, 5 figures, two tables (including one in the appendix) Submitted to the Journal of the Bombay Natural History Society (JBNHS

Modeling the effects of high strain rate loading on RC columns using Arbitrary Lagrangian Eulerian (ALE) technique

In recent years, many studies have been conducted by governmental and nongovernmental organizations across the world in an attempt to better understand the effect of explosive loads on buildings in order to better design against specific threats. This study is intended to contribute to increase the knowledge about how explosions affect reinforced concrete (RC) columns. In this study, a nonlinear model is developed to study the blast response of RC columns subjected to explosive loads. Numerical modeling of RC column under explosive load is presented using advanced finite element code LS DYNA. The obtained numerical model is validated with the experimental test and the results are in substantial agreement with the experimental data. ALE method for blast analysis is presented in the current research. The effects of scaled distance on the damage profile of RC columns are investigated. The results demonstrate that the level of damage increased with describing the scaled distance. Also the results shown duration for the blast loading, and hence the impulse, varies with charge masses at the specified scaled distance. Higher magnitude charge masses produced longer blast loading durations than lower magnitude charge masses. This means that at the same scaled distance, a charge mass of higher magnitude produced a higher impulse than the lower magnitude charge mass. The findings of this research represent the scaled distance is an important parameter that should be taken into account when analyzing the behavior of RC columns under explosive effects. The data collected from this research are being used to improve the knowledge of how structures will respond to a blast event, and improve finite element models for predicting the blast performance of concrete structures.Peer Reviewe

Design and Development of Bamboo Information System

Bamboo with thousands of species in the world, growing in a wide variety of soil and climatic conditions, plays an important role in providing livelihood, and ecological and food securities to mankind. The fastest-growing capacity of bamboo makes it a valuable sink for carbon storage. It prevents soil erosion and creates an effective watershed by binding soil along fragile riverbanks, deforested areas and in places prone to landslides. Recognizing the immense potential of bamboo and its socio-economic values, a number of international and nation agencies worldwide have came forward to support bamboo research and development. For the success of such programmes, information is a vital input. The availability of the right type of information at right time can trigger new directions in research, development and managerial action. But data on prior research are now widely scattered in different systems, formats and languages. The coordination and integration of information sources and systems have become a priority for bamboo research and development. The present study attempts to evaluate the present status and to prepare a plan for developing an international bamboo information system to integrate research and development in the sector. A prototype of web based bamboo information system also is developed and tested as part of the study

Design and Development of Bamboo Information System

Bamboo with thousands of species in the world, growing in a wide variety of soil and climatic conditions, plays an important role in providing livelihood, and ecological and food securities to mankind. The fastest-growing capacity of bamboo makes it a valuable sink for carbon storage. It prevents soil erosion and creates an effective watershed by binding soil along fragile riverbanks, deforested areas and in places prone to landslides. Recognizing the immense potential of bamboo and its socio-economic values, a number of international and nation agencies worldwide have came forward to support bamboo research and development. For the success of such programmes, information is a vital input. The availability of the right type of information at right time can trigger new directions in research, development and managerial action. But data on prior research are now widely scattered in different systems, formats and languages. The coordination and integration of information sources and systems have become a priority for bamboo research and development. The present study attempts to evaluate the present status and to prepare a plan for developing an international bamboo information system to integrate research and development in the sector. A prototype of web based bamboo information system also is developed and tested as part of the study

On the developmental morphology of the rosette galls of Acacia leucophloea Willd., (Mimosaceae) induced by Thilakothrips hablu Ramk. (Thysanoptera: Insecta)

Thilakothrips babuli induces rosette (artichoke) galls on the axillary buds of Acacia leucophloea. As a result of feeding by the building populations of thrips, axillary shoot meristems are destroyed, and primordial palisade tissues of the leaflets and cortical tissues of the shoot axis are transformed into nutritive cells of specialised morphology. Very similar to the galls induced by mites, midges, chalcids, and chloropids, Thilakothrips-induced Acacia galls also have a characteristic morphology, involving the inhibition of elongation of the shoot axis and crowding of maldeveloped leaflets. While describing the cecidogenesis in relation to the biology of the gall maker, an attempt has been made to discuss the morphological convergence among shoot apex galls