Excoecaria agallocha

About: Excoecaria agallocha is a research topic. Over the lifetime, 362 publications have been published within this topic receiving 5042 citations. The topic is also known as: Gewa.

The effect of salinity on organic components of Excoecaria agallocha L.

Abstract: The present report is about the growth of the seedlings of Excoecaria agallocha in different concentration of NaCl. The observation shows that the accumulation of ions and organic components such as starch and protein increased with increasing salt concentration upto optimal level (200 mM NaCl) and decreased at higher concentration. Aminoacids and total sugar decreased with increasing concentrations of NaCl upto optimal level and increased at higher concentrations. NaCl promoted chlorophyll and carotenoid synthesis upto the optimal concentrations of 200 mM. The plant can able to tolerate upto 300 mM NaCl concentration but the optimal growth of the seedlings were observed in 200 mM NaCl concentrations.

Distribution of Mangrove Species in the Islands of Jaffna Peninsula, Sri Lanka

Abstract: Mangroves are a group of halophytic, evergreen, woody plants and shrubs that occupy the intertidal zone. The Jaffna peninsula has some of the major mangrove sites in Sri Lanka with large extents of undisturbed mangroves. As a result of the three-decade long armed conflict that prevailed in the entire northern part of the Island, mangrove diversity and distribution has never been evaluated since 1969. The objective of the present study was to identify the mangrove species and their distribution in the Jaffna peninsula. Five locations were selected based on the distribution of mangrove vegetation. These are Mandaitivu (East and West), Sirudivu, Kuruchidivu, Kurikadduwan, and Kaluthaipiddi. Random quadrat method was used to assess the abundance of mangrove species in the area. A total of 21 species of true mangrove plants have been recorded in Sri Lanka and the present study identified seven (07) species in the Jaffna peninsula. These are Bruguiera cylindrica, Avicennia marina, Avicennia officinalis, Rhizophora mucronata, Excoecaria agallocha, Lumnitzera racemosa, and Ceriops tagal. A mangrove associate, Acanthus ilicifolius was also recorded. Of these, Bruguiera cylindrica is a species with restricted distribution. In the present study it was recorded only from Sirudivu (density 169/km2). Avicennia marina is the dominant species on the Islands and Southern coastal line. The island of Mandaitivu had a high density of this species (293/km2 on East and 1208/km2 on West Mandaitivu). Kuruchidivu also had a higher density (2571/km2) of this species compared to other island areas. Avicennia officinalis was restricted to Sirudivu and Kuruchidivu (density 246/km2 and 100/km2 respectively). Mangroves are one of the most diverse ecosystems and they provide suitable habitats for a large number of migratory bird species and other aquatic species such as fishes, shrimps, crabs, etc. which are important to marine fisheries in Sri Lanka. They are one of the most productive ecosystems on the earth. The mangroves also protect the coasts from the impacts of storms. The study area has large extents of relatively undisturbed mangroves, found mainly on the Eastern side of the Jaffna peninsula along with the lagoon line and the Southern part of the peninsula along the coastal line. Hence the present area has a considerable conservation value. Keywords: True mangroves, Mangrove associates, Distribution, Islands, Jaffna Peninsula

Seed Germination and Seedling Growth of Mangrove Excoecaria agallocha Under Different Salinities

Abstract: Salinity is one of the most important factors influencing the distribution of mangrove plant Excoecaria agallocha.Under different salinities,rooting rate,germination index,seedling establishment rate of E.agallocha seed were investigated and also the situation of stem height,base diameter,leaf number,maximum leaf area of E.agallocha seedlings.Results showed that under the low salinity 5,seed germination was similar to that under salinity 0,significantly higher than those under the middle salinity,15.Under high salinities(25 and 35),seed germination was very low.Only half of the seeds can root,but can't grow,and nearly all the roots were burnt by the high salt.The seedlings growth showed nearly the same condition.Under high salinities(25 and 35),the seedlings were successively dead in the first 2 months.

Kajian kesesuaian ekowisata mangrove di pantai bali desa mesjid lama kecamatan talawi kabupaten batu bara provinsi sumatera utara

Abstract: Bali Beach is a located in Batu Bara with an area of approximately 637.22 ha which is a coastal area about 30.6% of the total area.This study aims to determine the potential of mangrove ecosystem for ecotourism, calculate the suitability and mangrove ecotourism carrying capacity. This research was conducted in March to April 2014. Research method used was Purposive Sampling for potential mangrove. Using three stations consisted of the first station (located at the eastern area of Bali Beach), second station (located at the middle area of Bali Beach), and the third station (located at the west coast of Bali Beach). The mangrove species found are: Excoecaria agallocha, Avicennia marina, A.lanata, Bruguiera sexangula, B.cylindrica, Rhizophora mucronata, Aegiceras corniculatum, A.Officinalis, R. stylosa, Ceriops tagal with a population density values exceeding 1000 trees / ha. Suitability index tour of mangrove is 69,23%at the first station is with under unconditional category, and at the second station and third station are 94,87% with suitability category. The carrying capacity (DDK) at first station is 12 persons/day, 37 persons/day at second station and 16 persons/day at third station. Keywords : Ecotourism, Mangrove, Bali Beach