C.V.S. Gunatilleke's research while affiliated with University of Peradeniya and other places

Publications (86)

Article
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Resource allocation within trees is a zero-sum game. Unavoidable trade-offs dictate that allocation to growth-promoting functions curtails other functions, generating a gradient of investment in growth versus survival along which tree species align, known as the interspecific growth–mortality trade-off. This paradigm is widely accepted but not well...
Article
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ForestGEO is a network of scientists and long-term forest dynamics plots (FDPs) spanning the Earth's major forest types. ForestGEO's mission is to advance understanding of the diversity and dynamics of forests and to strengthen global capacity for forest science research. ForestGEO is unique among forest plot networks in its large-scale plot dimens...
Conference Paper
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Lower montane forest in "Knuckles Forest Reserve" is important due to harbouring of high biodiversity and provision of watershed services to Sri Lanka. In the British colonial era, these forests were cleared for coffee and tea plantations. However, some of these lands were abandoned due to low yield. Presently, these abandoned lands are dominated w...
Article
Little work has examined the spatial and temporal changes of a tropical rain forest for long time periods. Here, we present an analysis of long-term plot data from a Sri Lankan Mixed-Dipterocarp forest (MDF). The plots were established in 1978 at three different elevations (low - 335m, medium - 560 m, and high - 915 m). At each site we measured all...
Article
Mangroves are highly adapted to extreme environmental conditions that occur at the interface of salt and fresh water. Adaptations to the saline environment during germination are a key to mangrove survival, and thereby, its distribution. The main objective of this research was to study the effect of salinity on seed germination of selected mangrove...
Article
Rural communities have traditionally valued forests for a diversity of products and services, with timber serving a minor role. No-where has this diversity been greater than in tropical South Asia, and in particular south India and Sri Lanka. As economies advance towards full development and populations become increasingly urbanized, forests become...
Conference Paper
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No: 333 Plant Science and Forestry The steep slopes covered with lower montane forests of the Knuckles Forest Reserve (KFR), were exploited for plantation of coffee and tea during the colonial era. At present, the lower montane forest patches on the eastern slopes are highly fragmented. These isolated forest patches are frequently interspersed with...
Conference Paper
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Mangroves are salt tolerant evergreen forests, consisting of woody plants that have highly developed morphological and physiological adaptations to extreme conditions. However, information on the germination ecology of most mangroves is scant. Aegiceras corniculatum (L.) Blanco (Myrsinaceae) is an ecologically important mangrove tree producing cryp...
Article
Long-term surveys of entire communities of species are needed to measure fluctuations in natural populations and elucidate the mechanisms driving population dynamics and community assembly. We analysed changes in abundance of over 4000 tree species in 12 forests across the world over periods of 6–28 years. Abundance fluctuations in all forests are...
Article
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Neutral and niche theories give contrasting explanations for the maintenance of tropical tree species diversity. Both have some empirical support, but methods to disentangle their effects have not yet been developed. We applied a statistical measure of spatial structure to data from 14 large tropical forest plots to test a prediction of niche theor...
Conference Paper
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Termites (Order Euisoptera) are an integral part of forest ecosystems playing a key role in the decomposition of plant matter. Lowland rain forests in particular are known to harbour the greatest diversity of termites. This study was conducted in two Lowland forest types in the Knuckles region to examine the species composition, abundance and feedi...
Article
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Thrips of Sri Lanka have been poorly studied despite their significance to agriculture and horticulture of the country. A survey of thrips and their host plants was conducted in several parts of Sri Lanka during 2005-2008, with a view to record the species present, their distribution, host plant relationships and damage caused. Over 1,000 plant spe...
Conference Paper
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The Knuckle Forest Region has been subjected to heavy logging and land clearing resulting in several fragmented natural forests in montane and lowland regions. Termites are an integral part of tropical forests as decomposers of plant matter into useful humus. Forest termites of Sri Lanka have not been well documented despite their importance in for...
Conference Paper
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Natural forests in the Gannoruwa hills have been subjected to many disturbances: slopes (518-670 m) converted into cocoa plantations, which are much degraded now and parts of the summit planted with mahogany (712 m). Only the rest (>700 m) remains less disturbed. The impact of the mahogany plantation on forest termite fauna (an indicator taxon) was...
Article
The density of colonising tree seedlings is often very low in degraded human-induced tropical grass-lands. To investigate the mechanisms that constrain seedling establishment in grasslands on former tea plantations in Sri Lanka we planted seedlings of the native tree speciesDimocarpus longanLour., Macaranga indicaWight,Symplocos cochinchinensis(Lou...
Article
Doi: 10.4038/jnsfsr.v31i1-2.3023 J. Natn. Sci. Foundation Sri Lanka 2003 31(1&2): 57-71 Proceedings of the South and Central Asian MAB Meeting of Experts on Environmental Conservation, Management and Research, Hikkaduwa, Sri Lanka 15-18 October 2002
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This study was carried out to document some ecological aspects of weeds in an irrigated rice field ecosystem in Bathalagoda, Sri Lanka. The study was conducted from November 1995 to August 1997 in two rice fields which differed in weed management practices. A total of 89 vascular plant species of rice-weeds belonging to 21 families, 31 genera of al...
Article
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This study compares the termite assemblages in a natural and a secondary forest located at two different elevations in the Hantane hills, a tropical evergreen forest in mid country Sri Lanka, with a view to identify their distinctiveness. To sample the termites in the two forest types the belt transect method was used supplemented by random collect...
Article
Edaphic factors may determine the habitat associations shown by some tropical trees. In Sinharaja, a tropical rainforest in Sri Lanka, about 79% of tree species show habitat preferences. The present study attempted to investigate the role of edaphic factors in determining habitat specialization, using a reciprocal pot experiment with four edaphic s...
Book
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Invasive alien species (IAS) are considered to be a main and a direct driver of biodiversity loss across the globe, and Sri Lanka is not an exception. These IAS have been estimated to cost our economies enormously every year and is a major threat to sustainable development. All alien species will not become invasive or threaten the environment, how...
Article
1. Colonization by woody plants is often very slow or absent on grasslands occupying degraded land in the tropics. Seed dispersal limitation is widely reported, but the constraints to forest succession imposed by barriers to seedling establishment are poorly understood. We tested the hypotheses that seedling emergence of woody plants is limited by...
Article
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Above ground biomass production was estimated in a 25 year-old Pinus caribaea stand in the land belonging to the University of Peradeniya, in lower Hantana in the Central Province. Twenty four pine trees felled were used to collect data for developing allometric biomass equations and to estimate the above ground biomass. Empirical formulae were der...
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Summary • This article reviews the application of some summary statistics from current theory of spatial point processes for extracting information from spatial patterns of plants. Theoretical measures and issues connected with their estimation are described. Results are illustrated in the context of specific ecological questions about spatial patt...
Article
Most of the world's forest has been cleared, cultivated, and then often abandoned. In many instances these areas have changed to successionally arrested grasslands, shrublands, or fernlands maintained by frequent fires and high herbivore populations. Many studies have shown that various herbaceous, nitrogen-fixing legumes can protect soil surfaces,...
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Most ecological hypotheses about species coexistence hinge on species differences, but quantifying trait differences across species in diverse communities is often unfeasible. We examined the variation of demographic traits using a global tropical forest data set covering 4500 species in 10 large-scale tree inventories. With a hierarchical Bayesian...
Article
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Forest structure and species distribution patterns were examined among eight topographically defined habitats for the 205 species with stems [greater-than-or-equal] 1 cm dbh inhabiting a 25-ha plot in the Sinharaja rain forest, Sri Lanka. The habitats were steep spurs, less-steep spurs, steep gullies and less-steep gullies, all at either lower or u...
Data
The Western Ghats of India and Sri Lanka biodiversity hotspot is often regarded as one unit because of shared biogeographical history. However, recent studies sug-gest that certain faunal components, particularly in the wet zones are distinct. This article looks at the ex-isting information on species richness and endemicity of taxa in both regions...
Article
The angiosperm flora of Sri Lanka, which has been comparatively well studied by many eminent botanists for over two centuries, has a rich endemic component and also exhibits strong affinities to that of peninsular India Some of the 15 floristic regions recognized in the island have exceptionally rich, highly localized floras. But increased forest d...
Article
The purpose of our study was to examine whether the degree of ectomycorrhizal (EM) colonization was associated with amount of shade for potted seedlings of five rain forest tree species. Seedlings were exposed to a range of shade treatments—from the open to that emulating the degree of shade beneath a deep-canopied forest. The experiment was carrie...
Article
The south-western hill forests of Sri Lanka, harbouring a relict of the Deccan-Gondwana biota, represent an important element of the Sri Lanka-Western Ghats Biodiversity Hotspot. The tree vegetation of five of these forests along an altitudinal gradient from 300-1250 m a.s.l was quantitatively analysed. While tree density over 30 cm gbh increased w...
Conference Paper
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This study examined the adaptability of two non-timber Iiana species Coscinium fenestratum Colebr. (Menispennaceae) and Calamus ovoideus Thw. (Arecaceae) grown under different light intensities in a forest restoration trial established in 1991 in the Pinus caribaea buffer zone in Sinharaja. Enrichment species have been introduced to different tree...
Article
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Irrigated rice fields are temporary wetland agro-ecosystems, managed with a variable degree of intensity. A survey was carried out in Sri Lanka to document the overall biodiversity associated with this unique agro-ecosystem, using a combination of sampling techniques to document different groups of fauna and flora. The total number of biota recorde...
Article
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"Calamus ovoideus Thw. And Coscinium fenestratum Coebr. are economically important, naturally growing liana species in the disturbed habitats of lowland rain forests in Sri Lanka. Harvesting their mature stems has jeopardized their survival and led to dwindling populations. Growth performance, population sizes and the eco-physiology of these specie...
Article
We examine the financial aspects of three silvicultural systems to encourage the sustainability of valuable hardwood species in mixed-dipterocarp forests of southwest Sri Lanka. We compare the net present value (NPV) of the current forest management approach (diameter limit harvests) with shelterwood harvests that promote light hardwood timber spec...
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In the last 10 years the Sri Lankan government has changed its policy regarding its remaining rain forest from one that promoted commercial exploitation to one of conservation. The growing importance of uplands as catchments for water production, biodiversity conservation and other downstream services has been recognized by the Sri Lankan governmen...
Article
Our study tested the potential for establishing shade-tolerant tree species within different canopy removal treatments of an 18-year-old Pinus caribaea (Caribbean pine) plantation. We investigated whether planting within a Pinus plantation can be a solution to the dispersal, weed competition, and pathogen/insect problems rain forest tree species ha...
Article
Performance of seedlings of seven rain forest, canopy dominant Shorea species was studied in a transplant experiment in forest sites at three different elevations (low, mid and high) within the humid zone of southwest Sri Lanka. Five species generally inhabit low- to mid-elevations, one at mid- and lower montane elevations, and one exclusively at l...
Article
1. In the moist tropics, studies have demonstrated poor seedling establishment of late-successional trees on lands cleared of forest. Our study examined the potential for establishing late-successional tree species that dominate the canopy of rainforest by planting within and adjacent to experimental openings that were created within a Pinus cariba...
Article
1 Responses to the addition of P and Mg are described for eight species of Shorea section Doona (Dipterocarpaceae) which vary in their adult distribution across a topographic/soils gradient at Sinharaja Forest Reserve, Sri Lanka. 2 All combinations of the two nutrients resulted in increased dry mass yield, seedling height and leaf number after 24 m...
Article
1. Responses to the addition of P and Mg are described for eight species of Shorea section Doona (Dipterocarpaceae) which vary in their adult distribution across a topographic/soils gradient at Sinharaja Forest Reserve, Sri Lanka. 2. All combinations of the two nutrients resulted in increased dry mass yield, seedling height and leaf number after 24...
Article
In this study four species of the genus Shorea section Doom were investigated. All occur together as canopy trees in the Sinaraja rainforest of south-west Sri Lanka. Partitioning of the regeneration niche can be one explanation for the co-existence of ecologically similar canopy tree species within a forest. Seedlings were planted in plots located...