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The environmental challenges of declining mangroves: an analytical survey in Puttalam District in Sri Lanka

100%
Kaleel M. I. M., Nijamir K.
World News of Natural Sciences
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2017
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vol. 14
106-115
EN
This study under the title of “the environmental challenges of declining mangroves: a study based on Puttalam District in Sri Lanka” was undertaken to attain the primary objective ‘to identify the factors for the declining of the mangroves in the study area’ and the secondary objectives ‘identify the environmental challenges due to the mangroves declining in the study area and to suggest was to control the decline and to provide awareness of this problem among the inhabitants’. Both, primary and secondary data were collected for this study. As primary data, questionnaire survey, direct observation and constructed discussion were used. As secondary data, statistic reports, previous researches, books and magazines were employed. According to the analysis, major environmental challenges were encountered. These included ‘land fragmentation, biodiversity destruction, decreasing endemism in mangrove, loss of herbs and coastal soil erosion’. To overcome these challenges, many recommendations were put forward.
2
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Rediscovery of Critically Endangered Mangrove Lumnitzera littorea (Jack) Voigt (Combreataceae) from Bentota Estuary, Sri Lanka

88%
Madhushanka S., Ranawana K. B.
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EN
Lumnitzera littorea is a critically endangered true mangrove species in Sri Lanka. Although this species was observed in several localities in the past, it was only found in Madu Ganga Ramsar site. Even there, the population is considerably low with low regeneration potential. We have recorded a new population of L. littorea from Bentota estuary which was believed to be disappeared a long ago. This population is a considerably large and young. Hence, this new population would be the key to the future conservation of this highly threatened species in Sri Lanka. However, it is currently facing numerous threats from people thus proper conservation actions should immediately be taken.
3
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Success Rate of Mangrove Planting based on Mangrove Morphology at Pramuka Island, Kepulauan Seribu National Park, Indonesia

75%
Palufi G. E., Hamdani H., Pratama R. I., Sahidin A.
World News of Natural Sciences
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2019
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vol. 27
73-84
EN
Planting mangroves on Pramuka Island is done in a monoculture way and usually fails. However, the planting managed by the Kepulauan Seribu National Park has become more successful. The specific objective of the research was to quantify the success rate of mangrove planting in Pramuka Island based on survival, growth and benthos levels in Pramuka Island mangroves. The mangrove planting area that was used as the research sample was an area wherein the planting are 14, 12 and 6 years old. The type of mangrove that planted is Rhizophora stylosa. The number of plots was determined based on the area. Data was collected in the form of primary data, namely, the number of living trees, tree heights, number of leaves and leaf dimensions. The success of mangrove planting reached 52%, 66.43% and 57.5% at stations 1, 2 and 3. The highest success rate was at station 2, while stations 1 and 3 are considered failures. This indicates that Pramuka Island has a low success rate of mangrove planting.
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