Browsing by Author "Panagoda, P.A.B.G."

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Are human-modified land-uses important for avifaunal conservation or not? An example from Karanketiya, Rakwana, Sri Lanka
(Department of Zoology and Environmental Management, University of Kelaniya, Sri Lanka, 2017) Weerasinghe, H.W.G.A.S.; Panagoda, P.A.B.G.; Panagoda, P.A.S.U.
Improving conservation value of human-altered landscapes would be of massive importance, in years to come. The present study intended to assess the contribution of such landscapes in aid of conservation of avifauna. Abundance, species richness, species heterogeneity, evenness and composition of bird communities were analyzed on line transects during three months, including the migratory season, in three different land-use types namely, proposed reserved forest, tea estate and home gardens in Karanketiya, Rakwana. Total of 87 bird species including 79 residents with 15 endemics and 8 migrants were recorded. Species richness and total abundance per transect of three types of land-uses are significantly different (p<0.05, ANOVA). Species richness (n=68) was highest in tea estate while species heterogeneity (H’=3.612) and evenness (J’=0.872) were highest in home gardens. Percentage of endemic birds (25.6%) and percentage of migrant birds (12.8%) were highest in the forest and percentage of resident birds (74.6%) was highest in home gardens. The bird species composition in tea estate was highly comparable to that of home gardens (Cj=0.58). Percentage of openland birds (23.5%) was highest in tea estate whereas percentage of forest birds (59%) was highest in forest reserve. In addition, certain specialists were found exclusively within the forest. The higher diversity recorded, in human-modified landscapes has caused by its location in a closer proximity to forested areas and the wider array of different habitat types present. Therefore, such human-modified land-uses contribute for avifaunal conservation in the country. Yet, the long term impacts of such landscapes should be studied further.
A census of diurnal primates in the villages located between Labugama-Kalatuwawa and Indikada forest reserves in Colombo District of Sri Lanka.
(International Research Symposium on Pure and Applied Sciences, 2017 Faculty of Science, University of Kelaniya, Sri Lanka., 2017) Panagoda, P.A.B.G.; Weerasinghe, V.P.A.
The diurnal primate populations which inhabit the villages, located between Labugama-Kalatuwawa and Indikada Forest Reserves in Colombo District of Sri Lanka, has a high conservation value due to the presence of critically endangered Semnophithecus vetulus nestor (Western purple-faced langur). In addition, these diurnal primate populations consisting of S. vetulus nestor and Macaca sinica (Toque macaque have caused many human-monkey conflict incidents within the area. No studies have assessed the local populations of diurnal primates within this area in spite of its importance in both above perspectives: conservation and conflict. Therefore, this study was aimed to assess the relative density and group size of diurnal primates and to statistically compare above two estimations between the two primate species. The census was carried out within a selected stripe of villages located between the two forests. Using reconnaissance walks, five trails (2 km each) were established to represent the study area, with a systematic sampling design. The trails were walked simultaneously, by five independent trained teams each consisting of five persons, in the morning and afternoon on 3rd of December, 2016. In addition, group counts of monkeys were made during 10 opportunistic field visits, from April to December 2016. For each species, the average group size and group and individual encounter rates (as a measure of relative density) were calculated. The group sizes and encounter rates of the two species were then statistically compared using Mann-Whitney U test. Group size of S. vetulus nestor (mean ± SE) was lower (4.46 ± 0.40 individuals) than that of M. sinica (8.29 ± 2.19 individuals), even though the median group sizes of the two species were not significantly different (p=0.1893). On the other hand, S. vetulus nestor was found to be more abundant in the area compared to M. sinica. The number of encounters of S. vetulus nestor and M. sinica during the census was 10 and 4 respectively. Further, the average group encounter rates (mean ± SE) of S. vetulus nestor and M. sinica, were 0.95 ± 0.31 and 0.33 ± 0.23 respectively (no. of groups/km) whereas the average individual encounter rates (mean ± SE) of S. vetulus nestor and M. sinica, were 4.23 ± 1.38 and 2.71 ± 1.89 (no. of individuals/km) respectively. However, no significant difference was found between the median group (p=0.470) and individual (p=0.4647) encounter rates of the two species. Yet, the higher abundance of S. vetulus nestor over M. sinica, could also be observed during the opportunistic observations made throughout the whole study period (opportunistic group encounters; 22 for S. vetulus nestor and 9 for M. sinica). The reliability of the results can further be improved by censusing at different times of the year. As this study sets a baseline, future studies are recommended to identify any growth or decline of this crucial population of primates.
A potential habitat corridor for Western Purple-faced Langur between Forest Reserves in Sri Lanka: GIS as a tool in connectivity modelling
(Acta Ecologica Sinica, 2019) Panagoda, P.A.B.G.; Weerasinghe, V.P.A.
Endemic Western purple-faced langur (Semnophithecus vetulus nestor) of Sri Lanka, is an exclusively arboreal, critically endangered primate whose habitats are severely fragmented with the human population expansion. Labugama-Kalatuwawa Forest Reserve (LKFR) which is identified as the last strongholds for maintaining viable populations of the species over the long-run and Indikada Mukalana Forest Reserve (IMFR) which is located in a closer proximity to LKFR have no connection with each other at the current status. As there is no assertion of regional habitat connectivity at a metapopulation context, the study aimed to identify a potential habitat corridor for S. v. nestor between LKFR and IMFR by using GIS as a tool in connectivity modelling. Study area was first divided into 0.04 km2 grids using ‘fishnet’ tool. Fivemain resistance criteria for S. v. nestor movementwere selected namely; land use, road density, canopy cover, human tolerance and Feeding Plant Species Richness and Density (FPSRD). Each grid was assigned with resistance values for above criteria ranging from 1 to 6. Overall resistance layer for S. v. nestor movement was created using ‘weighted overlay’ in GIS environment. The best potential habitat corridorwas identified via least-costmodelling. The resultant corridor fallswithin an areawhichmainly comprises of forest and rubber (Hevea brasiliensis) monoculture. It further accounts for the highest human tolerance, canopy continuity, FPSRD and least road density. Resultant corridor can be improved by bridging existing gaps and enriching the corridor habitatswhichwould play an important role in conservation of S. v. nestor by minimizing the isolation of local populations, ensuring the gene flow and maintaining the minimum viable metapopulation in the long run. This study further demonstrates that GIS can be used as an effective tool for least-cost modelling which helps to identify potential wildlife movement corridors at minimum cost.
Sustainable tourism development in Negombo coastline: An option for co-management
(Faculty of Science, University of Kelaniya, Sri Lanka, 2016) Panagoda, P.A.B.G.; Dissanayake, D.M.S.N.; Nawalage, N.M.S.K.; Silva, H.K.A.D.; Tharaka, L.K.D.N.; Weerasinghe, H.W.G.A.S.; Bellanthudawa, B.K.A.; Kawshalyani, P.; Subanky, S.; de Silva, P.K.S.; Chandrasekara, W.U.
The Negombo coastline is a highly populous area on the west coast of Sri Lanka, and its northern sandy extremity is very popular among the local and foreign tourists. A field survey based on face-to-face interviews with the stakeholder segments was conducted in August 2015 to assess their role and contribution to the management, utilization and governance of this coastline and, to propose suitable management options. In this survey, information from the local stakeholder coastal community (n = 15) including a leading tourist hotel in the area was collected. In addition, information from the chief executive officers of Regional office of the Coast Conservation and Coastal Resources Management Department (CC & CRMD), Negombo Municipal Council (MC) and the Police Station (PS) were collected. The information from the survey were analysed and a SWOT analysis was carried out. The major strengths of the coastline were the presence of an extensive sandy beach and fish resources (78%) and utilization of these resource for income generation (98%), involvement of a large proportion of the local population in tourism (75%), high income gained by tourism (73%), frequent beach cleaning programmes performed the stakeholders (69%), high cleanliness of the beach (75%), high level of education of the local community (63%) and community participation in beach cleaning programmes (62%). The local government authorities are responsible for managing the beach; the CC & CRMD is responsible for preventing coastal erosion and illegal constructions within the beach façade; the MC regularly monitors the sewage discharges and cleanliness of the coastline; the local PS strictly ensures law and peace in the area. The major weaknesses were inadequate government involvement in beach maintenance (69%), lack of awareness and commitment (58%) and willingness (24%) of the local community in community based management (24%). Lack of coordination among CC & CRMD, MC and police over the governance of the coastline was another major weakness. The major opportunities were the possibility expand tourism related activities (25%) and improve cleanliness of the beach (25%). The major threats were the improper solid waste disposal in the coastline (48%), and high taxes against tourism related income generation activities (70%). In addition, child abuse by tourists, drug and liquor trafficking, high coliform count in sea water and coastal erosion were other the major threats. This survey highlights the importance of reinforcing an understanding between the local community and local government authorities over the management and governance of coastal resources in Negombo coastline. Therefore, formulating and strengthening a genuine co-management strategy is highly recommended for the sustainable tourism in this coastline.