scholarly journals Morphological Diversity of Complex Thalloid Liverwort Genera of Sri Lanka

2016 ◽  
Vol 44 (2) ◽  
pp. 27 ◽  
Author(s):  
N. C. S Ruklani ◽  
S. C. K Rubasinghe ◽  
D. G Long
Keyword(s):  
Sri Lanka ◽  
Morphological Diversity

scholarly journals Morphometric analysis of the genus Monochoria (Pontederiaceae) in Sri Lanka

2017 ◽  
Vol 24 (1) ◽  
pp. 13-22
Author(s):  
Savithri Sarojani Udage ◽  
Deepthi Yakandawala
Keyword(s):  
Sri Lanka ◽  
Morphometric Analysis ◽  
Species Complex ◽  
Morphological Diversity ◽  
Morphological Data ◽  
Sri Lankan ◽  
The Family ◽  
Plant Taxon ◽  
Reproductive Characters ◽  
Informative Character

The genus Monochoria is represented in Sri Lanka by only two species, M. hastata and M. vaginalis. Of the two species M. vaginalis exhibits a high morphological diversity. A morphometric analysis was performed on the Sri Lankan members of the genus Monochoria to evaluate the morphological diversity exhibited by comparing 34 vegetative, anatomical and reproductive characters. Both cluster and principal coordinate analyses resulted in four clusters of which one corresponded to M. hastata, while M. vaginalis was divided into three phenetic groups indicating that the Sri Lankan M. vaginalis is a species complex involving more than one taxon. The length ratio of the lower spathe petiole to inflorescence stalk was identified as an informative character in delimiting the phenetic groups, a character that has not been considered before. Further, the occurrence of sub-palisade cavities that are filled with a red colored liquid in the leaves of two phenetic groups was a novel character for the genus as well as the family Pontederiaceae.Keywords: Monochoria vaginalis; Morphological data; Sub-palisade cavities; Principal coordinate anaysis.Bangladesh J. Plant Taxon. 24(1): 13–22, 2017 (June)

scholarly journals Evaluation of Morphological Diversity of Conserved Tall Coconut (Cocos nucifera L.) germplasm in Sri Lanka

2016 ◽  
Vol 27 (4) ◽  
pp. 350
Author(s):  
K. N. S. Perera ◽  
H. M. N. B. Herath ◽  
D. P. S. T. G. Attanayaka ◽  
S. A. C. N. Perera
Keyword(s):  
Sri Lanka ◽  
Cocos Nucifera ◽  
Morphological Diversity

scholarly journals Eco-geographic variation of common wild rice - Oryza ru?pogon Griff. in Sri Lanka

2018 ◽  
Vol 1 (02) ◽  
pp. 36-43
Author(s):  
S Sandamal ◽  
A Tennakoon ◽  
D Ratnasekera ◽  
DABN Amarasekera ◽  
B Marambe
Keyword(s):  
Sri Lanka ◽  
Phenotypic Diversity ◽  
Flag Leaf ◽  
Morphological Diversity ◽  
Population Based ◽  
Leaf Length ◽  
Oryza Rufipogon ◽  
Conservation Strategies ◽  
Leaf Angle ◽  
Flag Leaf Length

Wild species of rice (Oryza) have superior agronomic characteristics to be incorporated in rice breeding programs worldwide.  Population studies of wild relatives of rice in Sri Lanka has not being well documented despite a few of attempts. In the present study, phenotypic diversity of Oryza rufipogon populations exist in Sri Lanka were characterized based on nine quantitative morphological traits. Populations (P1, P2, P3, P4 and P5) were established in a common-garden and were characterized. The results revealed moderate phenotypic diversity among O. rufipogon populations studied. However, flag leaf length and awn length were the most variable traits while plant height, flag leaf angle, flag leaf panicle neck length and spikelet angle were the least variable traits. O. rufipogon can be simply distinguished using flag leaf length and width, panicle branching type and distance from panicle base to lowest spikelet insertion. The dendrogram results indicated that four main clusters are at a similarity level of 98.73, showing the diversely related populations with a high identity based on higher similarity values. P1 and P2 populations grouped together by forming the first cluster. The second, third and fourth clusters consisted of P3, P5 and P4 populations, respectively. One population from first cluster and P3, P5 and P4 populations can be used for conservation. This study highlights the phenotypic diversity of O. rufipogon populations existing in Sri Lanka across the geographic locations and Knowledge on such morphological diversity provides opportunities to design conservation strategies and the potentials of using particular population based on breeding objectives.  

scholarly journals The morpho-genetic and ecological niche analyses reveal the existence of climatically restricted Cycas zeylanica complex in Sri Lanka

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Asanka Mudannayake ◽  
Lahiru Ranaweera ◽  
Preminda Samaraweera ◽  
Suneth Sooriyapathirana ◽  
Anoma Perera
Keyword(s):  
Sri Lanka ◽  
Ecological Niche ◽  
Ecological Niche Modeling ◽  
Principal Component ◽  
Morphological Diversity ◽  
Sri Lankan ◽  
Long Distance ◽  
Multiple Introductions ◽  
Reproductive Structures ◽  
Other World

AbstractTaxonomy and phylogenesis of Sri Lankan cycad species of the subsection Rumphiae has not been fully resolved and therefore, we conducted an island-wide survey of cycads of the subsection to assess their morphological or genetic variations while exploring the phylogenetic relationship between Sri Lankan Rumphiae and other world cycad species. Further, we assessed the possible distribution of the species in the region through climatic profiling, using maximum entropy modeling approach. We analyzed 21 variable morphological features in collected specimens and used the polymorphism of trnH-psbA locus to understand the phylogeny. The distance tree drawn from the principal component analysis revealed a significant variation in female reproductive structures. The maximum likelihood tree separated Sri Lankan Cycas zeylanica to a well-supported unigeneric clade (bootstrap = 96, posterior probability = 100) with shallow divergence. Ecological niche modeling supported the existence of Cycas zeylanica in South East Asia and in southern Western Ghats in India in addition to the Wet Zone of Sri Lanka. We rename the taxa as Cycas zeylanica complex based on the observed high morphological diversity of female reproductive structures which might have ascended due to multiple introductions of South East Asian cycads by long distance dispersal of seeds through sea currents.

scholarly journals Molecular phylogeny and phylogeography of the freshwater-fish genus Pethia (Teleostei: Cyprinidae) in Sri Lanka

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Hiranya Sudasinghe ◽  
Tharindu Ranasinghe ◽  
Jayampathi Herath ◽  
Kumudu Wijesooriya ◽  
Rohan Pethiyagoda ◽  
...  
Keyword(s):  
Sri Lanka ◽  
Incomplete Lineage Sorting ◽  
Phylogenetic Analyses ◽  
Morphological Diversity ◽  
Phylogeographic Structure ◽  
Sri Lankan ◽  
Lineage Sorting ◽  
Multiple Sources ◽  
Reciprocal Monophyly ◽  
Wet Zone

Abstract Background Sri Lanka is a continental island separated from India by the Palk Strait, a shallow-shelf sea, which was emergent during periods of lowered sea level. Its biodiversity is concentrated in its perhumid south-western ‘wet zone’. The island’s freshwater fishes are dominated by the Cyprinidae, characterized by small diversifications of species derived from dispersals from India. These include five diminutive, endemic species of Pethia (P. bandula, P. cumingii, P. melanomaculata, P. nigrofasciata, P. reval), whose evolutionary history remains poorly understood. Here, based on comprehensive geographic sampling, we explore the phylogeny, phylogeography and morphological diversity of the genus in Sri Lanka. Results The phylogenetic analyses, based on mitochondrial and nuclear loci, recover Sri Lankan Pethia as polyphyletic. The reciprocal monophyly of P. bandula and P. nigrofasciata, and P. cumingii and P. reval, is not supported. Pethia nigrofasciata, P. cumingii, and P. reval show strong phylogeographic structure in the wet zone, compared with P. melanomaculata, which ranges across the dry and intermediate zones. Translocated populations of P. nigrofasciata and P. reval in the Central Hills likely originate from multiple sources. Morphological analyses reveal populations of P. nigrofasciata proximal to P. bandula, a narrow-range endemic, to have a mix of characters between the two species. Similarly, populations of P. cumingii in the Kalu basin possess orange fins, a state between the red-finned P. reval from Kelani to Deduru and yellow-finned P. cumingii from Bentara to Gin basins. Conclusions Polyphyly in Sri Lankan Pethia suggests two or three colonizations from mainland India. Strong phylogeographic structure in P. nigrofasciata, P. cumingii and P. reval, compared with P. melanomaculata, supports a model wherein the topographically complex wet zone harbors greater genetic diversity than the topographically uniform dry-zone. Mixed morphological characters between P. bandula and P. nigrofasciata, and P. cumingii and P. reval, and their unresolved phylogenies, may suggest recent speciation scenarios with incomplete lineage sorting, or hybridization.

Author response for "Morphological diversity of acoustic and electric communication systems of mochokid catfish"

2020 ◽  
Author(s):  
L. Kéver ◽  
E. Parmentier ◽  
A.H. Bass ◽  
B.P. Chagnaud
Keyword(s):  
Communication Systems ◽  
Morphological Diversity ◽  
Author Response

Author response for "Morphological diversity of acoustic and electric communication systems of mochokid catfish"

2020 ◽  
Author(s):  
L. Kéver ◽  
E. Parmentier ◽  
A.H. Bass ◽  
B.P. Chagnaud
Keyword(s):  
Communication Systems ◽  
Morphological Diversity ◽  
Author Response

Abstract #604: Detection of Cardiovascular Risk Factors by Anthropometric Measures in Adults Living in an Urban Setting in Sri Lanka

2015 ◽  
Vol 21 ◽  
pp. 114-115
Author(s):  
Kavinga Gunawardane ◽  
Noel Somasundaram ◽  
Neil Thalagala ◽  
Pubudu Chulasiri ◽  
Sudath Fernando
Keyword(s):  
Risk Factors ◽  
Cardiovascular Risk ◽  
Sri Lanka ◽  
Cardiovascular Risk Factors ◽  
Urban Setting ◽  
Anthropometric Measures

Prevalence of Suicidal Ideation in Sri Lanka

Crisis ◽  
2010 ◽  
Vol 31 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Sudath Samaraweera ◽  
Athula Sumathipala ◽  
Sisira Siribaddana ◽  
S. Sivayogan ◽  
Dinesh Bhugra
Keyword(s):  
Suicidal Ideation ◽  
Sri Lanka ◽  
General Population ◽  
Suicide Attempts ◽  
National Average ◽  
The West ◽  
Suicide Methods ◽  
Suicide Rates ◽  
Completed Suicide ◽  
The World

Background: Suicidal ideation can often lead to suicide attempts and completed suicide. Studies have shown that Sri Lanka has one of the highest rates of suicide in the world but so far no studies have looked at prevalence of suicidal ideation in a general population in Sri Lanka. Aims: We wanted to determine the prevalence of suicidal ideation by randomly selecting six Divisional Secretariats (Dss) out of 17 in one district. This district is known to have higher than national average rates of suicide. Methods: 808 participants were interviewed using Sinhala versions of GHQ-30 and Beck’s Scale for Suicidal Ideation. Of these, 387 (48%) were males, and 421 (52%) were female. Results: On Beck’s Scale for Suicidal Ideation, 29 individuals (4%) had active suicidal ideation and 23 (3%) had passive suicidal ideation. The active suicidal ideators were young, physically ill and had higher levels of helplessness and hopelessness. Conclusions: The prevalence of suicidal ideation in Sri Lanka is lower than reported from the West and yet suicide rates are higher. Further work must explore cultural and religious factors.

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