News
Study identifies distinct frog species not belonging to generic ‘hourglass’ classification
by Ifham Nizam
A study on the abnormalities and polymorphisms of amphibians found within and outside the Horton Plains National Park has identified a distinct frog species that does not belong to its generic “hourglass frog” classification.
The study was conducted by graduate research assistant Praneeth Silva of Sri Jayewardenepura University’s Department of Zoology under the supervision of Prof. W. A. D. Mahaulpatha, senior lecturer and head, Department of Zoology.
“Our study on amphibian abnormalities and causes found that Taruga eques species is faced with bigger threats in both localities in comparison to other amphibian species”, Silva told The Sunday Island.
Within and outside regions of the Sri Lankan Plains, habitat modifications due to human activities were the main threat on Taruga eques. The study also found that natural predators were the main cause for formation of amphibian abnormalities found within the Plains.
The study revealed a novel pattern polymorphism of Taruga eques in that a variety of the species without the hourglass was identified within and outside the Plains, indicating that the common name Taruga eques cannot be broadly classified as an “hour-glass frog”. At the end of the study, new six dorsal colour variations and five dorsal pigment patterns of Taruga eques could be newly introduced to the science.
Amphibian body colouration and pigment patterns play a vital role for their survival in the environment. Polymorp-hism (happening together in the same habitat of two or more distinct species results in rarest of them getting mutated to be like the main species) has probably led Taruga eques to be seen as hourglass tree frog though in reality the situation is likely to be rather different.
Silva said that a total of 694 amphibians belonging to four families and 11 species were recorded in five lentic water bodies which were studied. Five hundred and eleven (511) individuals were examined inside the Plains and 183 outside the region. Of the 511 individuals, only 4.5 percent of the amphibians had abnormalities. Of the 183 individuals examined outside the Plains, 80.87 percent had abnormalities.
Of the 511 inspected amphibians within the Plains, 0.59 percent suffered from ectromelia and four percent had cysts. Of the 183 amphibians examined outside the Plains, 80.33 percent had cysts and 0.55 percent had femoral projections. Cysts accounted for most of the abnormalities in both environments. Most of the infections (60 percent) recorded in the amphibians inside the Plains were mild. In contrast 77.55 percent of the infections recorded in the amphibians outside the Plains were moderate.
A research associate attached to the University of Indonesia Research Centre for Climate Change Thasun Amarasinghe said that not only hourglass tree frogs but almost all amphibians in Sri Lanka are under threat.
“They are called hourglass tree frogs as they have a colour pattern like an hour glass mark on their dorsum (back). They are highland species, and are very sensitive to temperature and humidity so in addition to habitat loss and forest fragmentation, there will be a future threat to them due to climate change”, he warned.
The major conclusion of the study was the natural selection results in the ‘polymorphisms’ to face the threat of predation. Moreover, colour and pattern polymorphisms manifest due to strong selection by visually oriented predators and the polymorphisms are highly valuable for the species to ensure their survival in the environment, while helping them to avoid abnormalities.
(Pix courtesy Praneeth Silva)
News
‘Vision’ Programme Marks Two Years
Marking the completion of two years of the ‘Vision’ Programme, students from Pinnawala Central College and Matale Siri Seevali College were given an opportunity on Thursday (24) to visit the Presidential Secretariat.
The ‘Vision’ Programme was launched for schoolchildren jointly by the Presidential Secretariat, the Ministry of Education and the Department of Communication of the Parliament of Sri Lanka.
Following a visit to the former Parliament building at the Presidential Secretariat, the students were also briefed on the history of Parliament.
The role of the President’s Fund and its importance to schoolchildren were explained by Senior Additional Secretary to the President Roshan Gamage.
The ‘Vision’ commemorative book, featuring the two-year journey of the ‘Vision’ Programme and its special activities, was also presented to the participating schools.
As part of the programme, valuable plants were also presented to the schools as a symbolic gesture underscoring the importance of environmental conservation.
Director General of Public Relations Dharmasiri Gamage, the Director and Assistant Director of the Tri-Services Security Coordination Unit, the principals and teaching staff of Pinnawala Central College and Matale Siri Seevali College, and students were among those present on the occasion.
President’s Media Division (PMD)
News
Sajith vows to scrap 22A under future govt.
Opposition and SJB Leader Sajith Premadasa yesterday vowed that an SJB government would repeal the 22nd Amendment (22A) to the Constitution.Premadasa made the pledge while addressing thousands of SJB supporters who gathered near Parliament to protest against 22A.
Addressing the rally at Polduwa Junction, Battaramulla, Premadasa said the proposed constitutional amendment would undermine democracy and judicial independence and enable the concentration of political power in the Executive.
“Even if they pass it, under an SJB government we will scrap it,” Premadasa told the gathering, claiming that 22A was aimed at paving the way for a one-party state and placing the State under the control of a single political party.
Braving the rain, Premadasa said they had gathered there peacefully and had no intention of resorting to violence.
“We have gathered here to protect democracy,” he said, challenging the government to hold Provincial Council elections if it was confident of facing the people.
Premadasa said the SJB was prepared to work with any democratic and clean political force committed to the country’s progress and public welfare, amid ongoing discussions on cooperation among Opposition parties, including the United National Party.
Premadasa also accused groups aligned with the government of attempting to discourage people from attending the protest through statements and other measures.
SJB General Secretary Ranjith Madduma Bandara said the protest had been organised against the proposed amendment, which the party had opposed on the grounds that it could pave the way for authoritarianism.
The demonstration began around 9 a.m. at Polduwa Junction and coincided with Parliament taking up the proposed 22nd Amendment for debate. Proceedings on the Bill are scheduled to continue today (25).
The Supreme Court has determined that the proposed amendment does not require approval at a referendum and could be passed with a special majority in Parliament.
Meanwhile, traffic congestion was reported on roads surrounding Parliament and Polduwa Junction following the demonstration.
Security was also tightened in and around the Parliamentary complex, with a heavy police presence observed at Polduwa Junction and near the main entrance to Parliament.
News
Two retired female Navy officers remanded over disappearance of two women during war
Two retired female Navy petty officers were ordered to be remanded until October 5 over their alleged involvement in the abduction and disappearance of two women in Trincomalee during the war.
Trincomalee Chief Magistrate M.S.M. Samsudeen yesterday ordered that the two suspects be remanded and directed that they be produced for an identification parade on October 5.
The suspects, residents of Chilaw and Haputale, were arrested after appearing before the CID in connection with another court case. They were subsequently produced before the Trincomalee Magistrate’s Court.
The court was informed that the investigation concerned the alleged abduction of Sasikumar Thenmoli and Mary Delsia, residents of Paalaiyootru, Trincomalee, on or around May 13, 2008.
The CID told court that information uncovered during its investigations indicated that the two women had allegedly been detained at an underground location known as the “Gun Site” at the Trincomalee Naval Base while the two suspects were serving in the Navy. The women were subsequently reported missing.
Further investigations into the alleged abduction and disappearance of the two women are continuing.
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