Ayyappan Narayanan

Ayyappan Narayanan
French Institute of Pondicherry | FIP · Department of Ecology

Dr

About

72
Publications
48,836
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,635
Citations
Citations since 2016
52 Research Items
1435 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
Additional affiliations
May 2005 - present
French Institute of Pondicherry
Position
  • BIOTIK
Description
  • interactive key for tree species of Western Ghats
November 1997 - December 2001
Pondicherry University
Position
  • Senior Researcher
Education
June 1994 - May 1996
The American College, Madurai
Field of study
  • Botany

Publications

Publications (72)
Article
Calophyllum pascalianum, a medium sized tree occuring along the riverbanks in the southern Western Ghats of India, is described and illustrated. The species is different from the other allied species by its linear-oblong to linear-lanceolate leaves that are c. 7 times longer than broad. The population of the species in the type locality is threaten...
Article
Within a 30-ha permanent plot of a tropical evergreen forest in the Anamalais, Indian Western Ghats, all the 13?415 trees =30?cm?gbh (belonging to 153 species) were identified and tagged during 1997–1998. This communication reports the results of tree population changes based on two annual censuses (1999 and 2000) of the plot after the initial cens...
Article
A permanent plot of 30 ha (600 500 m2) was established for long-term ecological research on biodiversity and forest functioning in a tropical evergreen forest at Varagalaiar, Anamalais, Western Ghats. This paper gives the results of the first census of trees in the 30 ha plot. All trees 30 cm gbh were permanently tagged with sequentially numbered a...
Article
Full-text available
Selective logging disrupts forests, changing their structure and species composition. Long-term monitoring helps in identifying the factors influencing it and aids in designing management plans. We conducted a quantitative re-assessment of trees ≥ 30 cm girth at breast height in four 1 ha plots in logged and two 1 ha plots in adjacent unlogged comp...
Article
Full-text available
Tropical forest ecosystems are among the most essential habitats on Earth for conserving biological diversity and short-term climate regulation. For this reason, they are key areas of conservation policies in the world. In this paper, we aim to investigate the dynamics of forest cover and their changes in primary productivity by empowering informat...
Article
The use of remote sensing for examining phenological variation in tropical forests is scarce. The major objectives of the study were to characterize the intra-annual variability of phenological cycle of the Biligiri Ranganathaswamy Temple Tiger Reserve (BRT) and the potentiality of these phenological metrices in defining species assemblages by clas...
Article
Full-text available
Data capturing multiple axes of tree size and shape, such as a tree's stem diameter, height and crown size, underpin a wide range of ecological research - from developing and testing theory on forest structure and dynamics, to estimating forest carbon stocks and their uncertainties, and integrating remote sensing imagery into forest monitoring prog...
Article
Litsea keralana Kosterm. (Lauraceae), an endemic and threatened species is newly reported from Biligiri Ranganathaswamy Temple Tiger Reserve (BRTTR), Karnataka state. Hitherto, this species is known from Kerala and Tamil Nadu of the southern Western Ghats. The present study confirms the range extension of the species to further north towards Karnat...
Chapter
Full-text available
Forests across the globe have been exploited for resouces, and over the years the demand has increased, and forests are rather exploited instead of sustainable use. Focussed research on vegetation and forerst dynamics is necessary to preserve biodiversity and functioning of forests for sustanence of human life on Earth.This article emphasis that th...
Conference Paper
Full-text available
Lantana camara, one of the major invasive alien species, affects the native biodiversity directly by occupying suitable niches or indirectly by increasing the fire risk. It has been suggested that climate change may increase the likelihood of invasion via modification of species ranges and invasibility in some regions. This study aims at providing...
Article
Full-text available
When ordinating plots of tropical rain forests using stand-level structural attributes such as biomass, basal area and the number of trees in different size classes, two patterns often emerge: a gradient from poorly to highly stocked plots and high positive correlations between biomass, basal area and the number of large trees. These patterns are i...
Article
Full-text available
Documenting the biodiversity of protected areas and reserve forests is important to researchers, academicians and forest departments in their efforts to establish policies to protect regional biodiversity. Shettihalli Wildlife Sanctuary (SWS) is an important protected area located in the central Western Ghats of Karnataka state known for its divers...
Article
Full-text available
Documenting the biodiversity of protected areas and reserve forests is important to researchers, academicians and forest departments in their efforts to establish policies to protect regional biodiversity. Shettihalli Wildlife Sanctuary (SWS) is an important protected area located in the central Western Ghats of Karnataka state known for its divers...
Technical Report
Full-text available
The increasing spatial, spectral and temporal resolution of satellite images create a potential for producing accurate datasets on community level biodiversity and more widely, as an alternative to monitor individual species. This project is aimed to develop community level vegetation database for regional landscapes and describe vegetation charact...
Conference Paper
Full-text available
Fire is considered by many to be the most critical management concern in the ecologically sensitive zones such as the Western Ghats. The recurrent forest fires between December and May are challenging to the forest departments in mitigation. Hence, characterizing and predicting the fire vulnerable areas are of great importance in protected area ma...
Article
Full-text available
• Questions. Changes in the functional composition of tree communities along resource availability gradients have received attention, but it is unclear whether or not understory and canopy guilds respond similarly to different light, biomechanical, and hydraulic constraints. • Location. An anthropically-undisturbed, old-growth wet evergreen Diptero...
Conference Paper
Full-text available
I created an algorithm to processing a Multiple Time Series Analysis on Dry Matter Productivity, FAPAR and NDVI Satellite Products. I selected from 8 to 6 years of time resolution of an Indian Western Ghat Region to detect the forest changes. After I have been set the method I reproduce the model with higher Spatial Resolution Images (10m Sentinel...
Thesis
Full-text available
The principal aim of this thesis is to investigate a method and standardize it through an algorithm, to analyze with a remote sensing approach, the vegetation properties and indices trend, as well as their dynamics connected to the forest structures. My focus is to link the classic research fieldwork with remote sensing vegetation monitoring techni...
Article
Full-text available
The strong contribution of remote sensing has led to the development of the concept of the Remote Sensing enabled Essential Biodiversity Variables which represents a set of variables that can be monitored from space. This work synthesizes current state of research and technological development in use of remote sensing enabled essential biodiversity...
Article
Full-text available
Wetland ecosystems hold an important part of the world’s biodiversity and are complex social-ecological systems. Aiming to understand interdependencies among their components and to define management policies, the social-ecological trajectory of Oussudu lake – a wetland of Pondicherry region in South India – was reconstructed and analysed. During t...
Article
Full-text available
Aim Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large‐scale variation and...
Article
Full-text available
Aim: Tree crowns determine light interception, carbon and water exchange. Thus, understanding the factors causing tree crown allometry to vary at the tree and stand level matters greatly for the development of future vegetation modelling and for the calibration of remote sensing products. Nevertheless, we know little about large‐scale variation and...
Article
Full-text available
A lack of spatial congruence between carbon storage and biodiversity in intact forests suggests limited cobenefits of carbon‐focused policies for conserving tropical biodiversity. However, whether the same applies in tropical human‐dominated landscapes (HDLs) is unclear. In India's Western Ghats Biodiversity Hotspot, we found that while HDL forests...
Article
Full-text available
Plant traits—the morphological, anatomical, physiological, biochemical and phenological characteristics of plants—determine how plants respond to environmental factors, affect other trophic levels, and influence ecosystem properties and their benefits and detriments to people. Plant trait data thus represent the basis for a vast area of research sp...
Article
Full-text available
Roadways are inevitable components in any human managed landscape across the world, with the sole objective to facilitate transportation. Reserve forests are not an exception to this situation. A roadway being a potential factor in influencing biodiversity, this study checks the possibility of relationship between the distance of tree communities f...
Article
Full-text available
Aim Large tropical trees form the interface between ground and airborne observations, offering a unique opportunity to capture forest properties remotely and to investigate their variations on broad scales. However, despite rapid development of metrics to characterize the forest canopy from remotely sensed data, a gap remains between aerial and fie...
Article
Full-text available
Aim: Large tropical trees form the interface between ground and airborne observations, offering a unique opportunity to capture forest properties remotely and to investigate their variations on broad scales. However, despite rapid development of metrics to characterize the forest canopy from remotely sensed data, a gap remains between aerial and fi...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
Full-text available
Aim: Large tropical trees form the interface between ground and airborne observations, offering a unique opportunity to capture forest properties remotely and to investigate their variations on broad scales. However, despite rapid development of metrics to characterize the forest canopy from remotely sensed data, a gap remains between aerial and fi...
Article
Full-text available
Aim: Large tropical trees form the interface between ground and airborne observations, offering a unique opportunity to capture forest properties remotely and to investigate their variations on broad scales. However, despite rapid development of metrics to characterize the forest canopy from remotely sensed data, a gap remains between aerial and fi...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community led open-source database of biodiversity time se...
Article
Full-text available
Motivation: The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time se...
Article
Full-text available
The flora of Laos remains one of the least known within the Indo-Burma biodiversity hotspot. A floristic inventory was carried out in Phou Hin Poun National Biodiversity Conservation Area, an under-explored area of the Khammouane Limestone. This study provides a list of 27 taxa that are additions to the most recent country checklists. The Ebenaceae...
Data
TreeGhatsData is a compilation of lists of tree taxa found in Western Ghats, South India: taxa for which the word "tree" appears in habit description in the book Flowering plants of the Western Ghats edited by the Tropical Botanic Garden Research Institute (TBGRI), including planted or cultivated taxa (Nayar, Beegam, and Sibi. 2014); tree taxa des...
Article
Full-text available
The effects of fragmentation and overstorey tree diversity on tree regeneration were assessed in tropical rain forests of the Western Ghats, India. Ninety plots were sampled for saplings (1–5 cm diameter at breast height (dbh); 5×5-m plots) and overstorey trees (>9.55 cm dbh; 20×20-m plots) within two fragments (32 ha and 18 ha) and two continuous...
Article
Very high spatial resolution (VHSR) optical satellite imagery has shown good potential to provide non-saturating proxies of tropical forest aboveground biomass (AGB) from the analysis of canopy texture, for instance through the Fourier Transform Textural Ordination method. Empirical case studies however showed that the relationship between Fourier...
Presentation
Full-text available
The Western Ghats (WG), one of the main biodiversity hotspots of the world, shelter highly diverse forests in heterogeneous environments. The composition of these forests reflects a long and complex evolutionary and biogeographical history. Understanding the combined signatures of current and past biodiversity dynamics is needed to forecast the res...
Article
Full-text available
Studies on the residual impact of logging on the diversity and composition of tropical forests are scarce in India. We examined the impact of selective logging on tree species richness, composition and structure prevalent after 27 years. Trees ≥ 30 cm girth at breast height were inventoried in four 1 ha plots in selectively logged patches and two 1...
Article
Full-text available
Background: The Western Ghats of India contain the westernmost dipterocarp forests of Asia. However, only a few dipterocarp tree species actually coexist in the forest canopy among which Vateria indica and Dipterocarpus indicus are the most common. The mechanisms contributing to the coexistence of these phylogenetically closely related species have...
Research
Full-text available
In a survey of endophytic fungi associated with endemic plant Cinnamomum malabatrum leaves harbored a bioactive endophytic isolate CMS 3 was identified as Colletotrichum gloeosporioides through morphological and phylogenetic analysis based on ITS-rDNA. The ethyl acetate extract of fermentation broth of Colletotrichum gloeosporioides CMS 3 displayed...
Article
Full-text available
Growing pressures on mangroves throughout the world, highlight the need for studies of vegetation across spatio-temporal scales even in relict patches for ecosystem conservation. Mangroves experience human pressure due to coastal development and are also subjected to environmental stress such as cyclones, tsunami, floods, and sea-level rise, often...
Technical Report
Google apps to identify the tree species in the evergreen forests of the Western Ghats Download link: https://play.google.com/store/apps/details?id=com.ifp.biotik&hl=en OR in iTunes https://itunes.apple.com/fj/app/western-ghats-tree-id-biotik/id1085561257?mt=8
Chapter
Full-text available
The present study was aimed to investigate the diversity and functional traits of lianas in four tropical forest types of peninsular India. The work also intended to study the variation in the proportion of lianas with trees along an altitudinal gradient and to compare the functional traits of lianas and trees sharing similar environmental conditio...
Book
Full-text available
Lianas are woody climbers rooted in soil and are incapable of autonomous vertical growth above a certain height and rely on external support to reach forest canopy (Wyka et al. 2013). Lianas have long attracted the interest of botanists because of the peculiar characteristics associated with this life-form including their climbing mechanisms (Darwi...
Chapter
This chapter describes variation in species composition, density, climbing mechanisms and dispersal syndromes of lianas across four principal forest types of peninsular India. The forest types include: wet evergreen forest (WEF), semi-evergreen forest (SEF), seasonal dry forest (SDF), and dry evergreen forest (DEF). The chapter compares the charact...
Article
Full-text available
Medicinal plants are a world treasure to be natured for the benefit of mankind. About 85% of the world's population depends on traditional medical treatments based on plants remedies and ~ 25% of the world's pharmaceutical medicines are derived from plants. The resurgence of public interest in plant-based medicine coupled with rapid expansion of ph...