V S Ramachandran

RESEARCH, TEACHING, or OTHER INTERESTS

Forestry, Plant Science, Ecology, Evolution, Behavior and Systematics, Multidisciplinary

Scopus Publications

Potential Geographical Distribution of the Wheat Streak Mosaic Virus and its Impact on Food Security: Prediction Based on Modelling Using Climatic Factor
Emmanuel Der Tambile, Raji Pushpalatha, and Vilayannur Subramanian Ramachandran
IEEE
Climate change has a major effect on the world's food production systems through outbreaks and spread of vector-borne and non-vector-borne crop diseases that affect farmer's incomes and national economies. This study predicts the distribution of Wheat Streak Mosaic Virus (WSMV) from 2021-2040 using historical and future climate data and WSMV species data. Using a maxent species distribution model with a Training AUC of 0.899, Test AUC of 0.884, and a True Skill Statistic of 0.697, potential regions for WSMV distribution are identified. Isothermality of 15-33, precipitation in driest month between 10mm-300mm, mean diurnal temperature of 11°C and above; annual temperature range of 25°C-34°C; precipitation seasonality not exceeding 7; precipitation in coldest quarter of 50mm–250mm; and precipitation of driest quarter of 25mm-250mm will influence WSMV distribution. We recommend strict enforcement of cross-border plant protection regulations, empowerment of local farmers, and integration of national-level response in risk's preparedness plans.


Selective logging intensity alters the population stand structure of cullenia-mesua-palaquium dominated tropical wet evergreen forest of the western ghats, South India
V S RAMACHANDRAN
ALOKI Ltd
The present study was conducted in a population structure of selectively logged tropical wet evergreen forest, Cullenia-Mesua-Palaquium (CMP) forest series in the tropical wet evergreen forests of the Nelliampathy Hills, Western Ghats. The study was aimed to focus on how selectively logged treatment influences the density and basal area of CMP forest series stand structure. We sampled the number of individual trees (≥ 1 cm dbh, diameter at breast height) of CMP at 30 sites (20 × 50 m quadrat size), covering an area of 30.8 hectare (ha) in total. A total of 5936 tree individuals sampled had a mean density of 246 ha-1 and basal area of 20.73 metre square (m2) ha-1 from an area of 0.1 to 2.5 ha. Tree density per hectare and basal area differed significantly among plots with different logging treatments. Tree density and basal area were significantly lower in highly logged plots as compared to moderately logged and unlogged plots. The density of smaller trees was significantly higher in moderately logged plots. We suggest that heavy logging treatments might be a serious threat to the CMP forest series and may possibly alter its population structure and that the moderately logged treatments showed positive impacts on CMP stand structure and regeneration.


Multiple facets of rarity among rain forest trees in the Western Ghats of India
Priya Davidar, François Munoz, Jean-Philippe Puyravaud, D. Mohandass, and V.S. Ramachandran
Elsevier BV



First record of Elytraria acaulis (L.F.) Lindau (acanthaceae) from the Kerala state and its distribution extension in India
V. S. Ramachandran and M. Remesh
Pensoft Publishers
Elytraria acaulis (L.f.) Lindau (family Acanthaceae) is a perennial herb that is distributed in tropical Africa and Peninsular India. In India, this plant has been recorded from Northern Circar, Deccan, and Carnatic regions, on the eastern side of Peninsular India. We present here a new record from the Walayar Reserve Forest in Palakkad District, Kerala, which is the first known occurrence of this species from the western side of the peninsula. This species is added to the flora of Kerala state.


Status and distribution of Humboldtia bourdillonii (Leguminosae), an endangered tree species of the Western Ghats, India




Structure and floristic composition of old-growth wet evergreen forests of Nelliampathy Hills, Southern Western Ghats
V. S. Ramachandran and K. Swarupanandan
Springer Science and Business Media LLC



Socio-cultural perspectives to the sacred groves and serpentine worship in Palakkad district, Kerala




Dispelling the myth of tropical dry evergreen forests of India




Conservation planning for the Western Ghats of Kerala: I. A GIS approach for location of biodiversity hot spots