Abstract
The study was conducted in the Negombo estuarine lagoon locates in the Gampaha District of Sri Lanka. In this research, an investigation was carried out to identify and assess the distribution pattern of mangrove diversity across salinity gradient in the lagoon. A field survey was performed to collect primary data and vegetation sampling was carried out in two transects along the periphery of the lagoon. Located sample size is 5 m × 10 m. Fifteen samples were selected maintaining distribution of species heterogeneity. Only mangrove species were enumerated. In situ field-testing of salinity was carried out at monthly intervals during October 2012 to September 2013 for 15 samples. Shannon-Wiener diversity index was calculated to compare about the diversity of mangrove species. The Inverse Distance Weighted (IDW) interpolation technique in ArcGIS was performed to prepare spatial distribution maps. There are 18 mangrove species identified belonging to 14 genera and 12 families. Among them 14 species are “True” and 4 species are “Mangrove Associates”. Rhizophora mucronata, Rhizophora apiculata, Avicennia officinalis, Excoecaria agallocha and Acrostichum aureum are the most common species and Aegiceras corniculata, Aegiceras corniculata, Bruguiera sexangula and Xylocarpus granatom are the least common true mangrove species types found in the Negombo lagoon. Spatially the highest mangrove species diversity could be identified in the southern quarter and a small patch around the outlet of the lagoon. Relatively low species diversity is identified at the middle periphery of the lagoon. Spatial differences of the floristic composition and the diversity reflect the salinity tolerance ability of the different mangrove species.
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References
A field guide to the mangroves of Sri Lanka (2007) Biodiversity secretariat, Ministry of environment and natural resource, Battaramulla
Ashton M, Gunatilleke S, de Zoysa N, Dissanayake MD, Gunatilleke N, Wijesundara S (1997) A field guide to the common trees and shrubs of Sri Lanka. WHT publication, Colombo
Bernard S (1983) An introduction to the coastal geomorphology of Sri Lanka. National Museums of Sri Lanka, Colombo
Central Environmental Authority (CEA) (1994) Conservation management plan, Muthurajawela marsh and Negombo lagoon, Central Environmental Authority (Sri Lanka)/Euroconsult (Netherlands), Wetland conservation project-Sri Lanka
Chandrasekara CMKNK, Weerasinghe KDN, Ranjana PUK, Sumith P (2014) Colomboarts e-journal, Faculty of Arts, University of Colombo
Coastal Conversion Department (CCD) (1986) Master plan on coastal erosion management. Coastal Conversion Department and Danish Hydraulic Institute, Colombo
De Silva M, De Silva Padma K (1998) Status, diversity and conservation of the mangrove forests of Sri Lanka. J South Asian Nat Hist 3(1):79–102
Emerton Lucy and Kekulandala L.D.C.B. (2003). Assessment of the economic values of Muthurajawela wetland, Occasional papers of IUCN Sri Lanka, IUCN-World conservation union, Sri Lanka country office, No. 4
Environmental profile of Muturajawela and Negombo lagoon (1991) Grater Colombo economic commission, EUROCONSULT, The Netherlands
Forest department and Central Environment Authority (CEA) Sri Lanka (2000) Integrated resources management programme in wet land and forest department, Zoning plan for the mangrove areas of the Negombo lagoon, Technical Report, Project 417.44211.1, ARCAIDS-EUROCONSULT, The Netherlands
Hettiarachchi SSL, Samarawickrama SP (2011) Environmental management of lagoons for sustaining multiple uses – case study Negombo lagoon, engineer. J Inst Eng Sri Lanka 34(1):43–55
http://2.bp.blogspot.com/-F2NMutbhzo0/UqCIbGtgR5I/AAAAAAAAAIA/1mm2wpQWS3g/s1600/mangrove-forest1.jpg. Accessed 25 Jan 2015
Jayatissa LP (2012) Present status of mangroves in Sri Lanka, the national read data list of Sri Lanka: conservation status of fauna and flora, biodiversity secretariat of the ministry of environment and national herbarium. Department of National Botanic Gardens, Sri Lanka, pp 197–199
Kahawita DWR, Vaithialingam E (1954) Report on beach study in the vicinity of Negombo Lagoon. Report on beach study, Transactions of the engineering association of Ceylon, Part-1
Karunathilake KMBC (2003) Status of mangroves in Sri Lanka. J Coast Dev 7(1):5–9
Katupotha Jinadasa (2012) Anthropogenic impacts on urban coastal lagoons in the Western and North-western coastal zones of Sri Lanka. In: Proceeding of the international forestry and environment symposium, University of Sri Jayawardhanapura, p 58
Peeris CVS (1975) The ecology of the endemic tree species of Sri Lanka in relation to their conservation. PhD thesis, University of Aberdeen
Rajapaksha JK (1997) Low frequency tidal response and water exchange in a restricted lagoon: the Negombo lagoon-Sri Lanka. Thesis for master of science degree in physical oceanography at the University of Gothenburg, Oceanography Division, National Aquatic Resource and Development Agency (NARA), Colombo-15, pp 1–36
Silva EIL (1996) Negombo lagoon, water quality of Sri Lanka, a review on twelve water bodies. Institute of fundamental studies, Kandy, pp 44–63
Acknowledgement
National Herbarium, Peradeniya, Sri Lanka.
Ms. Samanmalie Matharaarchchi, Department of Geography, University of Colombo, Sri Lanka.
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Chandrasekara, C.M.K.N.K., Weerasinghe, K.D.N., Pathirana, S., Piyadasa, R.U.K. (2016). Mangrove Diversity Across Salinity Gradient in Negombo Estuary-Sri Lanka. In: Singh, R., Prokop, P. (eds) Environmental Geography of South Asia. Advances in Geographical and Environmental Sciences. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55741-8_17
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