Dulan Jayasekara

Dulan Jayasekara
University of Sri Jayewardenepura · Department of Zoology

PhD

About

45
Publications
26,988
Reads
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38
Citations
Citations since 2016
45 Research Items
38 Citations
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2016201720182019202020212022051015
Introduction
My research areas focus on Mammalogy, Population Ecology, Spatial Ecology, Remote Sensing, Habitat Modeling and SDM.
Additional affiliations
October 2021 - present
University of Sri Jayewardenepura
Position
  • Lecturer
December 2017 - October 2021
University of Sri Jayewardenepura
Position
  • Research Assistant
Education
October 2018 - October 2021

Publications

Publications (45)
Article
Full-text available
Garlic (Allium sativum L.) botanically a member of the Lillaceae family and Allium genus, is considered to be rich in medicinal properties. The undamaged bulbs contain allin which will be enzymatically converted to allicin during cutting. Allicin, is the major bioactive compound found in garlic followed by other organosulfur compounds. Preparation...
Article
Full-text available
Horton Plains National Park is home for three endemic and threatened agamid species in Sri Lanka; Ceratophora stoddartii, Cophotis ceylanica and Calotes nigrilabris. This study was conducted to estimate the population densities of these lizard species within HPNP in 2016 and 2017. Line transect surveys were carried out following the "Distance" meth...
Article
Full-text available
Alien invasive species are a significant threat to biodiversity and ecosystems in nonnative geographical ranges. Ulex europaeus is one such shrub introduced to the montane grasslands of Sri Lanka. We conducted this study with the objective of evaluating the U. europaeus removal programs focusing on both positive and negative impacts that arose. Thr...
Article
Full-text available
Reliable population estimates are crucial for the conservation and management of faunal species. Population data of meso-mammal carnivores in Sri Lanka, as well as elsewhere in the world, is scarce. We estimated population densities of meso-mammal carnivores in Maduru Oya National Park (MONP) using Random Encounter Model (REM) and Camera Trap Dista...
Article
Full-text available
Animals have developed different survival strategies to mitigate the threats and dangers arising from predators. In addition to the physiological challenges, dealing with multiple predators is one of the common survival requirements of animal species at most trophic levels. Survival in such scenarios depends on the detection of the predator, predat...
Article
Full-text available
Background: Sparganosis is a zoonotic disease caused by Plerocercoid larvae (spargana) of the genus Spirometra. We aimed to provide molecular evidence for the infection of amphibians with Spirometra sp. in the inside and outside of Horton Plains National Park (HPNP), Sri Lanka. Methods: The prevalence of sparganum infection in wild frogs (Truga...
Article
Full-text available
The Indian pangolin (Manis crassicaudata) is a solitary, medium–sized mammal native to South Asia. In this study we used camera trap data recorded during a meso–mammal survey conducted from January 2019 to January 2021 to assess the occupancy, habitat associations, population density and activity patterns of Indian pangolins in Maduru Oya National...
Article
Full-text available
The use of remotely triggered cameras for studies of bird ecology is uncommon. We used camera trap data from a survey conducted from January 2018 to April 2021, to analyze the habitat use and activity patterns of Sri Lanka Spurfowl Galloperdix bicalcarata which is known as a shy and secretive forest bird endemic to Sri Lanka. Study sites included p...
Article
Full-text available
Habitat suitability modeling and identification of spatiotemporal niches helps in understanding the ecological requirements of faunal guilds. Small and medium sized felids of wild Sri Lanka include three cat species; fishing cat (Prionailurus viverrinus), jungle cat (Felis chaus) and, rusty-spotted cat (Prionailurus rubiginosus). These felids are h...
Article
Full-text available
The butterflies are an extremely diverse group of enticing insects in Sri Lanka, comprising 248 known species, of which 26 are endemic species. Present study was conducted from January 2019 to December 2019 in the Maduru Oya National Park with the main objectives of estimating the butterfly diversity and its temporal variation throughout the year....
Conference Paper
Full-text available
Conservation of rare and secretive forest species depends on appropriate prediction of habitat variability effects on their distribution patterns. Use of remotely triggered cameras for studies of bird ecology is uncommon. We used camera trap bi-catch data, recorded during a meso-mammal survey conducted from January 2018 to January 2021, to analyze...
Article
Full-text available
Availability of accurate and detailed vegetation and habitat maps is an essential requirement in the modern ecological studies. Geo-referenced vegetation maps of Sri Lanka's protected areas are scarce and only a handful of maps are available with detailed vegetation patterns. Since majority of the current ecological research work takes place within...
Article
Full-text available
Butterflies are very fascinating flying insects among lepidopterans and essential bio indicators of ecology and evolutionary studies. There are about 19000 species of butterflies has distributed around the world. The Western Ghats – Sri Lanka region is a global biodiversity hot spot characterized by a large number of endemic species. With respect t...
Conference Paper
Full-text available
Mesomammals of Order: Canivora represent an influential guild of forest vertebrates in the dry zone forests of Sri Lanka. This study was conducted to investigate the carnivorous mesomammal species assemblage and activity patterns in Maduru Oya National Park (MONP). Camera traps are increasingly used to study species activity patterns and temporal o...
Presentation
Full-text available
The present study was conducted from January 2019 to December 2019 around the Maduru Oya Reservoir in the Maduru Oya National Park with the main objectives of estimating the butterfly diversity and its temporal variation throughout the year.
Conference Paper
Full-text available
The butterflies are an extremely diverse group of enticing insects in Sri Lanka, comprising 248 known species, of which 26 are endemic species. Present study was conducted from January 2019 to December 2019 around the Maduru Oya Reservoir in the Maduru Oya National Park with the main objectives of estimating the butterfly diversity and its temporal...
Conference Paper
Full-text available
Meso-mammal carnivores represent an important guild of forest vertebrates that have not attracted much research attention. This study was conducted to investigate the meso-mammal carnivore abundance and activity patterns in Horton Plains National Park (HPNP). Camera trap surveys were conducted from January 2019 to June 2020 establishing 40 camera s...
Technical Report
Full-text available
In September 2019, the IUCN/CI Biodiversity Assessment Unit held a workshop to complete IUCN Red List assessments for 169 species of snakes and lizards of the 230 currently (September 2019) described reptile species known from Sri Lanka, as part of the Global Reptile Assessment. Additionally, a preliminary Key Biodiversity Area (KBA) assessment was...
Article
Full-text available
Four species of mongooses; Brown mongoose (Herpestes fuscus), Grey mongoose (H. edwardsii), Black-tipped/Ruddy mongoose (H. smithii) and Stripe-necked/Badger mongoose (H. vitticollis) belonging to the family Herpestidae are found in Sri Lanka. The distribution, abundance, activity and habitat characteristics of family Herpestidae was studied using...
Article
Full-text available
Sri Lanka is a bird paradise. The island supports a rich avifaunal diversity that stands at 453 species at present. At least 240 species of birds are breeding residents and 189 species are non-breeding visitors to this country. Among them 33 resident species are endemic to Sri Lanka. Mixed species flocking behavior is a common phenomenon in tropica...
Conference Paper
Full-text available
Breeding ecology of Indian Blackbird (Turdus merula kinnisii) was studied at the tropical montane cloud forests of Horton Plains National Park, situated in the highland plateau of the central highlands, from September 2015 to August 2018 within three consecutive days per month. This sub species is endemic to montane forests of Sri Lanka. There are...
Conference Paper
Full-text available
Indian pitta (Pitta brachyura) is a remarkable winter visitor in Sri Lanka. It breeds in Northern parts of India and migrates to South India and Sri Lanka in the winter. Although this species is included in folktales from centuries ago, there is inadequate data on ecological aspects as its foraging ecology. The objectives of this study were to dete...
Conference Paper
Full-text available
Avian frugivory of three Bramble species: Rubus ellipticus, Rubus indicus and Rubus leucocarpus was studied in the tropical montane cloud forests (TMCF) of Horton Plains National Park (HPNP), in Nuwara Eliya district of Sri Lanka, from September 2016 to August 2018. Brambles of the Genus Rubus are common in high elevations above 1500m and many spec...
Conference Paper
Full-text available
Maduru Oya (588 km2; is the third largest national park in Sri Lanka.. Since its establishment in 1983, the park has become a sanctuary for a rich faunal assemblage including many important mammalian species. This research was carried out with the objective of updating existing knowledge on the occurrence of medium and large sized terrestrial mamma...
Article
Full-text available
The endemic endangered agamid lizard Calotes nigrilabris inhabits the grasslands of Horton Plains National Park (HPNP) and it is restricted to a few localities in the central highlands of Sri Lanka. In this study, the microhabitat utilisation of Calotes nigrilabris was investigated utilising line transects and quadrate method. The comparison of ava...
Conference Paper
Full-text available
The current study was conducted in and around five selected lentic waterbodies at the Horton Plains National park (HPNP), in Sri Lanka from January 2016 to December 2016 for three consecutive days per month with the objective of studying the utilization of lentic waterbodies by inhabiting herpetofauna. Amphibian and agamid survey was conducted in t...
Presentation
Full-text available
The current study was conducted in and around five selected lentic water bodies at the Horton Plains National park; Sri Lanka from January 2016 to December 2016, with the objective of studying the utilization of lentic water bodies by inhabiting herpetofauna.
Conference Paper
Full-text available
Horton Plains National Park (HPNP) is home to three endemic and threatened agamid species in Sri Lanka; Ceratophora stoddartii, Cophotis ceylanica and Calotes nigrilabris. This study was carried out from January 2016 to November 2017 in selected months to estimate the population densities of these 3 lizard species within HPNP. The area of the park...
Conference Paper
Full-text available
Calotes nigrilahris and Calotes versicolor are two allopatric lizard species of the genus Calotes. C nigrilahris is restricted to montane habitats over 1000 m a.s.l. while C. versicolor is more widely distributed and occurs below 1000 m a.s.l. Due to this elevation difference in distribution, significant differences can be observed in the habitat a...
Article
Full-text available
The present study was conducted in tropical montane cloud forests of Horton Plains National Park in Sri Lanka, from January 2016 to December 2016, focusing on Fejervarya greenii which is an endemic, endangered and a rare species, in order to study its habitat preference in and around lentic and lotic water bodies with the purpose of providing infor...
Conference Paper
Rhino-horned lizard (Ceratophora stoddartii) is an endemic endangered agamid restricted to the high altitude montane forests of Sri Lanka. The temporal relationship between the life history of C. stoddartii and the life cycles of understory plants of Montane Cloud Forests was investigated for two consecutive years (January 2016 to January 2018) wit...
Article
Full-text available
The habitat utilization of Ceratophora stoddartii at the Horton Plains National Park was investigated using transect and quadrate sampling methods from September 2015 to September 2017. The results from 124 sightings of C. stoddartii, indicated that a major percentage (67.7%) of 84 sightings inhabited the montane cloud forests. This was followed by...
Article
Full-text available
The reason for the Calotes nigrilabris adult males to have black-cheek/lips was investigated from August 2016 to August 2017 in the grasslands of the Horton Plains National Park, which is located on the southern plateau of the central highlands of Sri Lanka. Line transects and visual encounter surveys were carried out to find individual lizards and...
Conference Paper
Full-text available
The microhabitat selection of endemic endangered frog species, Fejerverya greenii was studied in randomly placed plots in and around five lentic water bodies of the Horton Plains National park (HPNP), situated in the highland plateau of the Nuwara Eliya District from January 2016 to December 2016. Sampling was conducted once a month using plot samp...
Conference Paper
Full-text available
With the objective of providing important data through studying diurnal behavioral patterns and substrate use for the conservation of endemic endangered frog Fejervarya greenii the study was conducted in and around five lentic waterbodies in HPNP for three consecutive days per month from January to December 2016. Time periods were selected as 06:00...
Conference Paper
Full-text available
Behavioural adaptations and related utilization of habitat by the endemic lizard Calotes nigrilabris was studied utilising line transects and quadrates for a period of one year from January to December 2016 in the grasslands of Horton Plains National Park (HPNP), Nuwara Eliya District. A total of 108 transects, each 200 meters in length, were laid...
Article
Full-text available
Morphometric parameters of endemic endangered highland lizard Calotes nigrilabris were obtained utilizing three fixed length 200m line transects in the grassland habitat of Horton Plains National Park (HPNP). The PCA analysis of mophometric data revealed five discrete clusters which were categorized into five maturity stages as Adult male, Adult Fe...

Questions

Questions (9)
Question
I have downloaded L2A granules from NASA GEDI database in H5 file format. Even though the file can be opened in Arc GIS desktop version it's hard to work with the large amount of data without clipping it. I tried rGEDI package in R. However, the newer versions of R do not support the package anymore and it is not currently available in CRAN database. Thank you in advance for anyone who can provide a solution.
Question
The general, formula says cv=sd/mean. However, some people have used SE/mean for the same. Can someone clarify this and say what is more accurate.
Question
I have seen maxent modelling being applied to a range of distribution types from small scale to large scale. Is it effective to use maxent for small areas like Protected areas and National Parks (<1000 km2 area) . In my opinion macroscale covariates like the bioclimatic variables make little impact in small ranges. Therefore, using finer scale covariates that make an impact within the study area would make a better impact on the model. I am looking for ideas and suggestions.
Question
I am new to the software package and currently going through a learning curve.
The above file is not included in the data files associated with the version I am using. In an earlier software manual, I came across this Example: Example 3: Multiple and non-linear covariates, and producing species occurrence maps which use the file: Single-season example.xls.Can someone help me find it?
Question
I have been trying all the possible links for sci-hub today and none of them seem to be working. Would be glad if anyone can provide a working link. Thank you.

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