An Assessment of the Status of Biodiversity in the ... - IUCN

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Therefore, with a view to contributing towards safeguarding the ecological functions, resourcesand values of the Maduganga estuary for conservation and future sustenance of biodiversity,IUCN Sri Lanka undertook a systematic survey to document the status of biodiversity in thiscoastal wetland. This paper intends to highlight the biodiversity of Maduganga, and providescientific knowledge in a simplified manner to facilitate future initiatives to conserve thisvaluable coastal wetland ecosystem.Figure 1.Location of the Maduganga mangrove estuary(Source: CEA/Euroconsult, 1997)3
2. MethodologyPeriod of field survey, sampling frequency and timeA six-month field survey commenced at the beginning of May, 2000 and was completed by theend of October, 2000. Field sampling was carried out at fortnightly intervals; each samplingsession spanning over six continuous days. In order to avoid a time bias for a particularsampling site when recording fauna, each selected sampling site was covered at different timesof the day during the above survey period. Nocturnal visits were also made to all samplingsites, during each sampling session.Sampling sitesAfter an initial reconnaissance survey, the Maduganga ecosystem was divided into six majorstrata (Table 1; Figure 2), based on the occurrence of different plant communities and ahypothetical salinity gradient (Upper reaches of estuary - lower salinity; Lower reaches ofestuary - higher salinity). These strata were sampled for fauna and flora at 2-3 randomsampling sites. Apart from the islands, the mainland area around the estuary was surveyed upto a maximum of 50m from the edge of water.Table 1Sampling sites in Maduganga estuaryRegion Strata & Physical features Major vegetation Community1. Upper areas 1.1. Streams, Marshland Cerbera-Syzygium-Bruguiera(Low salinity) 1.2. Kothduwa & Dikduwa islands Rhizophora-Bruguiera-Exoecaria2. Mid areas 2.1. Honduwa, Erawanaduwa, Mixed vegetation(Moderate salinity) Dimiduwa, Maduwa &Mimaduwa islands.2.2. Miraladuwa, Naiduwa & Rhizophora-Bruguiera-Muwanduwa islands. Exoecaria-mixed vegetation.3. Lower areas 3.1. Katuduwa, Thiniyaduwa, Rhizophora dominant,(High salinity) Mahaladuwa, Galmanduwa, Bruguiera- Exoecaria-Gonaduwa & Madaduwa Dolichandron mixed vegetationIslands3.2. Rivermouth, Randombe lake Rhizophora dominant mangrovesystem4
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Page 4 and 5: SummaryThe Maduganga estuary and ma
Page 8 and 9: 1.11.22.12.23.13.2Figure 2Sampling
Page 10 and 11: Identification of ecologically impo
Page 12 and 13: plots, while Excoecaria agallocha a
Page 14 and 15: 4. Fauna of MadugangaSpecies compos
Page 16 and 17: from these mammals, a few species o
Page 18 and 19: 6. Major Threats to Biodiversity in
Page 20 and 21: alien faunal species affect the nat
Page 22 and 23: 7. Recommendations for Conservation
Page 24 and 25: AcknowledgementsIUCN Sri Lanka wish
Page 26 and 27: No. Family Botanical name Status Li
Page 34 and 35: No. Family Botanical name Common na
Page 36 and 37: No. Family Botanical name Common na
Page 38 and 39: Family Species Status Abundance Hab
Page 40 and 41: Appendix 4List of Amphibians record
Page 42 and 43: Appendix 6List of Avifauna recorded
Page 44 and 45: Family Species Status RelativeAbund
Page 46 and 47: Appendix 7List of Mammals recorded
Page 48 and 49: Family Species Status AbundanceLemo
Page 50 and 51: Appendix 10List of terrestrial moll
Page 52 and 53: Pinto, M. L. (1986). Mangroves of S
Page 54 and 55: Notes51

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