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For the Leopard

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The leopard is the most widespread of all the big cats. The typical form came from Egypt. Its present range extends from sub-Saharan Africa across the Arabian Peninsula into the Indian subcontinent, including Sri Lanka and further eastwards to China, Korea, Peninsular Malaysia and Java. It was the Swedish Botanist, Carl Linnaeus who first gave the leopard its scientific name, Panthers pardus in 1758. Given the leopard’s wide geographical distribution, a number of subspecies have been described since then.

Deraniyagala (1949) recognized the Sri Lankan leopard as a separate subspecies, Panthera pardus kotiya on the basis that it differed from the mainland form, Panthera pardus fusca by its smaller size and longer tail. Fernando (1964) found no justification for such a distinction, yet recent DNA based genetic studies by Miththapala and others. (1991,1992) have confirmed the genetic distinctness and validity of the Sri Lankan subspecies.

Sri Lankan leopards are characterized by decreased genetic variation in comparison to those in India. They are believed to have been isolated on the island for about 10,000 years. The confirmation of the Sri Lankan leopard as a distinct subspecies is important, as it makes it all the more imperative that proper measures are adopted to conserve it, and its habitat. As this is the only large, spotted felid in Sri Lanka, it cannot be confused with any other wild animal.

The pelage colour is usually golden-tawny or rufous-brown covered with open rosette-like black spots, whose size varies with the age of the animal: the spots are usually larger and farther apart as the animals get older. No two leopards have the same pattern of spots. Older animals often have lighter skin. The rosettes in leopards lack the additional black spots inside, which distinguish them from the Jaguar Panthers onca.

Unlike the tiger Panthers tigris, leopards frequently produce a black or melanistic variety, known as “Black Panther” which is rare in Sri Lanka. They are caused by a recessive gene and are more numerous than the conventionally coloured form in the humid rainforests of Peninsular Malaysia. Melanistic leopards are rare in East Africa, perhaps due to the limited extent of forests. Leopards from arid areas tend to be paler than those from humid forests.

Both melanistic and normal coloured young appear in the same litter. Although albinos among leopards are known, they are extremely rare. In Sri Lanka, at the turn of the century, the leopard was very common especially in the forests of the low country. It ranged from sea level to an altitude of over 2,000 m in the Horton Plains. More recently, a combination of forest conversion and poaching has substantially reduced both the number and range of the leopard in Sri Lanka, and today viable populations occur only within protected areas.

The key conservation areas where leopard are still found in Sri Lanka are: Gal Oya National Park, 62,936 ha; Hakgala Strict Nature Reserve, 1,142ha; Horton Plains National Park, 3,160ha; Hurulu Forest Reserve 26,012ha; Lahugala-Kitulana National Park, 1,554ha; Maduru Oya National Park,58,850 ha; Minneriya National Park, 8,889ha; Peak Wilderness Sanctuary, 22,380ha; Ritigala Strict Nature Reserve, 1,528ha; Ruhunu National Park, 126,782ha; Sinharaja National Heritage Wilderness Area, 8,864ha; Somawathiya Chaitiya National Park, 37,762ha; Thirukonamadu Nature Reserve, 25,019ha; Ude Walawe National Park, 30,812ha; Victoria-Randenigala-Rantambe Sanctuary, 42,087ha; Wasgomuwa National Park, 37,063ha; and Wilpattu National Park 132,317ha. Thus, the leopard’s range includes a total of 624,484 ha, 78% of the island’s protected area.

Leopards of the low country in Sri Lanka are in general larger than those found in the hills. The leopard is an extremely adaptable predator. It is a great wanderer over a given area, and like other forest animals that live a nomadic life, must remain inconspicuous while it sleeps as well as while it hunts. In Sri Lanka leopards occupy a variety of habitats, that range from the dry, semi-arid thorn scrub in the lowlands to the dense montane cloud forest at altitudes of over 2,000m. The only habitat which the leopard is unable to cope with is outright desert.

Today, in Sri Lanka, as human settlements and farming encroach into what used to be wilderness areas, the leopard finds itself with its back against the wall, except in protected areas, and in the hills. This ability to survive in higher altitudes is an advantage for the leopard as the human imprint becomes conspicuous in the lowlands. However, it is essentially a forest animal: even those adapted to semi-arid conditions appear to have a physiological need for shade during the heat of the day. This explains why it is not often encountered in the wild at mid-day. In areas where the leopard has learned to fear man, it becomes much more cautious and nocturnal.

Unless accompanied by dependent young the leopard is generally solitary: 81% of the observations made by Eisenberg & Lockhart (1972) in Wilpattu National Park were of solitary animals, while pairs accounted for only 19%. When undisturbed, the leopard spends a considerable part of its daily activity on the ground, seeking refuge in trees at times. In Ruhunu National Park, it often uses the rocky outcrops of Kotigala and Jamburagala in Block I as vantage points. Much of the daytime is spent dozing, either in the dense scrub, or draped over a stout branch of a tree.

Leopards Crossing the Buttala Kataragama Road Milinda Wattegedera
of the Yala Leopard Diary

Leopards have excellent night vision, and hunt relying very largely on sight. Although the leopard is often considered to be a nocturnal predator, this generalization may not be strictly valid across the range of the species. In areas where poaching is intense, the leopard is certainly more active at night and becomes highly secretive. It becomes more nocturnal only in areas where it feels insecure by day, as a result of human harassment or disturbance by other carnivores. But within many of the protected areas in Sri Lanka, the leopard appears to be the least nocturnal of all the worlds big cats.

The leopard is a more opportunistic predator than any other felid and will attempt to kill any prey it comes across. Despite its relatively small body size, the Sri Lankan leopard is capable of taking large prey, and is extremely adaptable to changes in prey availability. In general, female leopards with cubs are more successful in killing their prey than males. Larger prey is taken predominantly by the females when they are lactating.

Leopards sometimes carry their kill and rest it on a branch of tall tree in order to avoid the unwelcome attention of other predators such as jackals and crocodiles. In the Serengeti National Park in East Africa, leopards are known to climb trees with a 150 kg Grant’s gazelle clamped between their teeth. Leopards prefer prey in the 20-70kg size category, with an upper limit at about 150kg, two or three times the weight of the cat itself.

Females also use their slightly smaller home ranges more effectively in capturing prey. However, should the prey density become very low, they would range over a wider area, since the behaviour of female felids is usually more closely keyed to resources, given their responsibility of raising young. Both females and males spend a substantial part of their time locating and capturing prey, especially during the night.

The classic hunt consists of stalk, chase and kill. Stalking distances vary according to prey type, and as far as the male leopards are concerned, they increase as the prey size increases. In captivity, leopards are fed 1-1.2 kg of meat per day or 365-438 kg per year. On the assumption that on average 25% of a kill consists of inedible portions, Schaller (1972) suggests that a leopard may need 487-584 kg of meat per year to survive in the wild.

But according to Turnbull-Kemp (1967), a leopard can eat from between 8.1-17.6 kg of meat in a 12 hour period. This factor perhaps explains why the leopard is catholic in its food habits. Foraging effort per individual also varies seasonally, with prey being relatively easily captured during the dry season. Although the leopard’s principal prey in Sri Lanka is the Spotted deer Axis axis, several other herbivores may function as buffer prey items.

The leopard always kills its large quadruped prey by seizing it by the throat with its teeth and then grasping it firmly round the neck and shoulders with its strong forelegs, and commences feeding on the soft parts in the belly first. Unless disturbed, it will stay by its kill until all the edible portions have been consumed.

In a study of 183 leopards, Amerasinghe et al. (1990) found hair of 12 genera of mammals, highlighting the fact that the leopard is more diverse in its food preference than was presumed before. Their study shows that in addition to the spotted deer, other mammals such as the wild boar Sus scrofa, mouse deer Tragulus meminna, black-naped hare Lepus nigricollis and even water buffalo Bubalus bubalis are also eaten by the leopard.

It is especially interesting to note the capacity of the leopard in Sri Lanka to subsist at times on much smaller prey such as rodents, frogs, snakes, and birds, when its usual prey are scarce. According to Eisenberg & Lockhart (1972), buffalo calves are rarely taken because of the vigilance of the cows. Occasionally, the leopard may eat carrion. In one instance, two leopards were seen feeding on an elephant carcass in Ruhunu National Park. One of the more significant observations regarding the leopard’s diet is the almost complete absence of domestic livestock, even from areas close to human settlements.

CONSERVATION: Leopards are an integral part of the food chain, and an unobtrusive part of the ecosystem, valuable both for their ecological role and for their exquisite beauty. The greatest threat to any wild cat comes from the increasing use of poison in agricultural areas. Hoogerwerf (1970) considered the critical element in the decline of the Javan tiger to be poison, almost certainly the work of agricultural settlers, for whom the predator is an unwelcome visitor. As Myers (1976) points out, given its propensity for scavenging, the leopard is more susceptible to taking poisoned meat.

Leopards are also widely poached for their skins, even within protected areas. Poaching still continues to be a threat throughout the leopards’ range in Sri Lanka. A 100 years ago, Clark (1901) estimated the number of leopards in the island to be about 1,660. At the beginning of the twentieth century at least 50% of the land was forested. Since then forest cover has declined to less than 23% of the land area.

The leopard is seriously affected by deforestation and the consequent loss of habitat. Given the low overall population, the leopard may be among the most seriously endangered species of large mammal in Sri Lanka. Viable conservation areas that support the leopard in Sri Lanka, and the establishment of connecting corridors, must be of sufficient size to ensure that at least minimum populations exist within their boundaries.

The article by late Professor Charles Santiapillai is extracted from the publication “for the leopard’



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Retirement age for judges: Innovation and policy

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I. The Constitutional Context

Independence of the judiciary is, without question, an essential element of a functioning democracy. In recognition of this, ample provision is made in the highest law of our country, the Constitution, to engender an environment in which the courts are able to fulfil their public responsibility with total acceptance.

As part of this protective apparatus, judges of the Supreme Court and the Court of Appeal are assured of security of tenure by the provision that “they shall not be removed except by an order of the President made after an address of Parliament supported by a majority of the total number of members of Parliament, (including those not present), has been presented to the President for such removal on the ground of proved misbehaviour or incapacity”[Article 107(2)]. Since this assurance holds good for the entirety of tenure, it follows that the age of retirement should be defined with certainty. This is done by the Constitution itself by the provision that “the age of retirement of judges of the Supreme Court shall be 65 years and of judges of the Court of Appeal shall be 63 years”[Article 107(5)].

II. A Proposal for Reform

This provision has been in force ever since the commencement of the Constitution. Significant public interest, therefore, has been aroused by the lead story in a newspaper, Anidda of 13 March, that the government is proposing to extend the term of office of judges of the Supreme Court and the Court of Appeal by a period of two years.

This proposal, if indeed it reflects the thinking of the government, is deeply disturbing from the standpoint of policy, and gives rise to grave consequences. The courts operating at the apex of the judicial structure are called upon to do justice between citizens and also between the state and members of the public. It is an indispensable principle governing the administration of justice that not the slightest shadow of doubt should arise in the public mind regarding the absolute objectivity and impartiality with which the courts approach this task.

What is proposed, if the newspaper report is authentic, is to confer on judges of two particular courts, the Supreme Court and the Court of Appeal, a substantial benefit or advantage in the form of extension of their years of service. The question is whether the implications of this initiative are healthy for the administration of justice.

III. Governing Considerations of Policy

What is at stake is a principle intuitively identified as a pillar of justice.

Reflecting firm convictions, the legal antecedents reiterate the established position with remarkable emphasis. The classical exposition of the seminal standard is, of course, the pronouncement by Lord Hewart: “It is not merely of some importance, but is of fundamental importance that justice should not only be done, but should manifestly and undoubtedly be seen to be done”. (Rex v. Sussex Justices, ex parte McCarthy). The underlying principle is that perception is no less important than reality. The mere appearance of partiality has been held to vitiate proceedings: Dissanayake v. Kaleel. In particular, reasonableness of apprehension in the mind of the parties to litigation is critical: Ranjit Thakur v. Union of India, a reasonable likelihood of bias being necessarily fatal (Manak Lal v. Prem Chaud Singhvi).

The overriding factor is unshaken public confidence in the judiciary: State of West Bengal v. Shivananda Pathak. The decision must be “demonstrably” (Saleem Marsoof J.) fair. The Bar Association of Sri Lanka has rightly declared: “The authority of the judiciary ultimately depends on the trust reposed in it by the people, which is sustained only when justice is administered in a visibly fair manner”.

Credibility is paramount in this regard. “Justice has to be seen to be believed” (J.B. Morton). Legality of the outcome is not decisive; process is of equal consequence. Judicial decisions, then, must withstand public scrutiny, not merely legal technicality: Mark Fernando J. in the Jana Ghosha case. Conceived as continuing vitality of natural justice principles, these are integral to justice itself: Samarawickrema J. in Fernando v. Attorney General. Institutional integrity depends on eliminating even the appearance of partiality (Mandal Vikas Nigam Ltd. v. Girja Shankar Pant), and “open justice is the cornerstone of our judicial system”: (Sahara India Real Estate Corporation Ltd. v. SEBI).

IV. Practical Constraints

Apart from these compelling considerations of policy, there are practical aspects which call for serious consideration. The effect of the proposal is that, among all judges operating at different levels in the judicature of Sri Lanka, judges of the Supreme Court and the Court of Appeal only, to the exclusion of all other judges, are singled out as the beneficiaries of the proposal. An inevitable result is that High Court and District Judges and Magistrates will find their avenues of promotion seriously impeded by the unexpected lengthening of the periods of service of currently serving judges in the two apex courts. Consequently, they will be required to retire at a point of time appreciably earlier than they had anticipated to relinquish judicial office because the prospect of promotion to higher courts, entailing higher age limits for retirement, is precipitately withdrawn. Some degree of demotivation, arising from denial of legitimate expectation, is therefore to be expected.

A possible response to this obvious problem is a decision to make the two-year extension applicable to all judicial officers, rather than confining it to judges of the two highest courts. This would solve the problem of disillusionment at lower levels of the judiciary, but other issues, clearly serious in their impact, will naturally arise.

Public service structures, to be equitable and effective, must be founded on principles of non-discrimination in respect of service conditions and related matters. Arbitrary or invidious treatment is destructive of this purpose. In determining the age of retirement of judges of the Supreme Court and the Court of Appeal, some attention has been properly paid to balance and consistency. The age of retirement of a Supreme Court judge is on par with that applicable to university professors and academic staff in the higher education system. They all retire at 65 years. Members of the public service, generally, retire at 60. Medical specialists retire at 63, with the possibility of extension in special circumstances to 65. The age of retirement for High Court Judges is 61, and for Magistrates and District Judges 60. It may be noted that the policy change in 2022 aimed at specifically addressing the issue of uniformity and compatibility.

If, then, an attempt is made to carve out an ad hoc principle strictly limited to judicial officers, not admitting of a self-evident rationale, the question would inevitably arise whether this is fair by other categories of the public service and whether the latter would not entertain a justifiable sense of grievance.

This is not merely a moral or ethical issue relating to motivation and fulfillment within the public service, but it could potentially give rise to critical legal issues. It is certainly arguable that the proposed course of action represents an infringement of the postulate of equality of treatment, and non-discrimination, enshrined in Article 12(1) of the Constitution.

There would, as well, be the awkward situation that this issue, almost certain to be raised, would then have to be adjudicated upon by the Supreme Court, itself the direct and exclusive beneficiary of the impugned measure.

V. Piecemeal Amendment or an Overall Approach?

If innovation on these lines is contemplated, would it not be desirable to take up the issue as part of the new Constitution, which the government has pledged to formulate and enact, rather than as a piecemeal amendment at this moment to the existing Constitution? After all, Chapter XV, dealing with the Judiciary, contains provisions interlinked with other salient features of the Constitution, and an integrated approach would seem preferable.

VI. Conclusion

In sum, then, it is submitted that the proposed change is injurious to the institutional integrity of the judiciary and to the prestige and stature of judges, and that it should not be implemented without full consideration of all the issues involved.

By Professor G. L. Peiris
D. Phil. (Oxford), Ph. D. (Sri Lanka);
Former Minister of Justice, Constitutional Affairs and National Integration;
Quondam Visiting Fellow of the Universities of Oxford, Cambridge and London;
Former Vice-Chancellor and Emeritus Professor of Law of the University of Colombo.

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Ranked 134th in Happiness: Rethinking Sri Lanka’s development through happiness, youth wellbeing and resilience

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In recent years, Sri Lanka has experienced a succession of overlapping challenges that have tested its resilience. Cyclone Ditwah struck Sri Lanka in November last year, significantly disrupting the normal lives of its citizens. The infrastructure damage is much more serious than the tsunami. According to World Bank reports and preliminary estimates, the losses amounted to approximately US$ 4.1 billion, nearly 4 per cent of the country’s Gross Domestic Product. Before taking a break from that, the emerging crisis in the Middle East has once again raised concerns about potential economic repercussions. In particular, those already affected by disasters such as Cyclone Ditwah risk falling “from the frying pan into the fire,” facing multiple hardships simultaneously. Currently, we see fuel prices rising, four-day workweeks, a higher cost of living, increased pressure on household incomes, and a reduction in the overall standard of living for ordinary citizens. It would certainly affect people’s happiness. As human beings, we naturally aspire to live happy and fulfilling lives. At a time when the world is increasingly talking about happiness and wellbeing, the World Happiness Report provides a useful way of looking at how countries are doing. The World Happiness Report discusses global well-being and offers strategies to improve it. The report is produced annually with contributions from the University of Oxford’s Wellbeing Research Centre, Gallup, the UN Sustainable Development Solutions Network, and other stakeholders. There are many variables taken into consideration for the index, including the core measure (Cantril Ladder) and six explanatory variables (GDP per Capita ,Social Support,Healthy Life Expectancy,Freedom to Make Life Choices,Generosity,Perceptions of Corruption), with a final comparison.

According to the recently published World Happiness Report 2026, Sri Lanka ranks 134th out of 147 nations. As per the report, this is the first time that Sri Lanka has suffered such a decline. Sri Lanka currently trails behind most of its South Asian neighbours in the happiness index. The World Happiness Report 2026 attributes Sri Lanka’s low ranking (134th) to a combination of persistent economic struggles, social challenges, and modern pressures on younger generations. The 2026 report specifically noted that excessive social media use is a growing factor contributing to declining life satisfaction among young people globally, including in Sri Lanka. This calls for greater vigilance and careful reflection. These concerns should be examined alongside key observations, particularly in the context of education reforms in Sri Lanka, which must look beyond their immediate scope and engage more meaningfully with the country’s future.

In recent years, a series of events has triggered political upheaval in countries such as Nepal, characterised by widespread protests, government collapse, and the emergence of interim administration. Most reports and news outlets described this as “Gen Z protests.” First, we need to understand what Generation Z is and its key attributes. Born between 1997 and 2012, Generation Z represents the first truly “digital native” generation—raised not just with the internet, but immersed in it. Their lives revolve around digital ecosystems: TikTok sets cultural trends, Instagram fuels discovery, YouTube delivers learning, and WhatsApp sustains peer communities. This constant, feed-driven engagement shapes not only how they consume content but how they think, act, and spend. Tech-savvy and socially aware, Gen Z holds brands to a higher standard. For them, authenticity, transparency, and accountability—especially on environmental and ethical issues—aren’t marketing tools; they’re baseline expectations. We can also observe instances of them becoming unnecessarily arrogant in making quick decisions and becoming tools of some harmful anti-social ideological groups. However, we must understand that any generation should have proper education about certain aspects of the normal world, such as respecting others, listening to others, and living well. More interestingly, a global survey by the McKinsey Health Institute, covering 42,083 people across 26 countries, finds that Gen Z reports poorer mental health than older cohorts and is more likely to perceive social media as harmful.

Youth health behaviour in Sri Lanka reveals growing concerns in mental health and wellbeing. Around 18% of youth (here, school-going adolescents aged 13-17) experience depression, 22.4% feel lonely, and 11.9% struggle with sleep due to worry, with issues rising alongside digital exposure. Suicide-related risks are significant, with notable proportions reporting thoughts, plans, and attempts, particularly among females. Bullying remains a significant concern, particularly among males, with cyberbullying emerging as a notable issue. At the same time, substance use is increasing, including tobacco, smokeless tobacco, and e-cigarettes. These trends highlight the urgent need for targeted interventions to support youth mental health, resilience, and healthier behavioural outcomes in Sri Lanka. We need to create a forum in Sri Lanka to keep young people informed about this. Sri Lanka can designate a date (like April 25th) as a National Youth Empowerment Day to strengthen youth mental health and suicide prevention efforts. This should be supported by a comprehensive, multi-sectoral strategy aligned with basic global guidelines. Key priorities include school-based emotional learning, counselling services, and mental health training for teachers and parents. Strengthening data systems, reducing access to harmful means, and promoting responsible media reporting are essential. Empowering families and communities through awareness and digital tools will ensure this day becomes a meaningful national call to action.

As discussed earlier, Sri Lanka must carefully understand and respond to the challenges arising from its ongoing changes. Sri Lanka should establish an immediate task force comprising responsible stakeholders to engage in discussions on ongoing concerns. Recognising that it is not a comprehensive solution, the World Happiness Index can nevertheless act as an important indicator in guiding a paradigm shift in how we approach education and economic development. For a country seeking to reposition itself globally, Sri Lanka must adopt stronger, more effective strategies across multiple sectors. Building a resilient and prosperous future requires sound policymaking and clear strategic direction.

(The writer is a Professor in Management Studies at the Open University of Sri Lanka. You can reach Professor Abeysekera via nabey@ou.ac.lk)

by Prof. Nalin Abeysekera

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Hidden diversity in Sri Lanka’s killifish revealed: New study reshapes understanding of island’s freshwater biodiversity

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Aplocheilus parvus

A groundbreaking new study led by an international team of scientists, including Sri Lankan researcher Tharindu Ranasinghe, has uncovered striking genetic distinctions in two closely related killifish species—reshaping long-standing assumptions about freshwater biodiversity shared between Sri Lanka and India.

Published recently in Zootaxa, the research brings together leading ichthyologists such as Hiranya Sudasinghe, Madhava Meegaskumbura, Neelesh Dahanukar and Rajeev Raghavan, alongside other regional experts, highlighting a growing South Asian collaboration in biodiversity science.

For decades, scientists debated whether Aplocheilus blockii and Aplocheilus parvus were in fact the same species. But the new genetic analysis confirms they are “distinct, reciprocally monophyletic sister species,” providing long-awaited clarity to their taxonomic identity.

Speaking to The Island, Ranasinghe said the findings underscore the hidden complexity of Sri Lanka’s freshwater ecosystems.

“What appears superficially similar can be genetically very different,” he noted. “Our study shows that even widespread, common-looking species can hold deep evolutionary histories that we are only now beginning to understand.”

A tale of two fishes

The study reveals that Aplocheilus blockii is restricted to peninsular India, while Aplocheilus parvus occurs both in southern India and across Sri Lanka’s lowland wetlands.

Despite their close relationship, the two species show clear genetic separation, with a measurable “genetic gap” distinguishing them. Subtle physical differences—such as the pattern of iridescent scales—also help scientists tell them apart.

Co-author Sudasinghe, who has led several landmark studies on Sri Lankan freshwater fishes, noted that such integrative approaches combining genetics and morphology are redefining taxonomy in the region.

Echoes of ancient land bridges

The findings also shed light on the ancient biogeographic links between Sri Lanka and India.

Scientists believe that during periods of low sea levels in the past, the two landmasses were connected by the now-submerged Palk Isthmus, allowing freshwater species to move between them.

Later, rising seas severed this connection, isolating populations and driving genetic divergence.

“These fishes likely dispersed between India and Sri Lanka when the land bridge existed,” Ranasinghe said. “Subsequent isolation has resulted in the patterns of genetic structure we see today.”

Meegaskumbura emphasised that such patterns are increasingly being observed across multiple freshwater fish groups in Sri Lanka, pointing to a shared evolutionary history shaped by geography and climate.

A deeper genetic divide

One of the study’s most striking findings is that Sri Lankan populations of A. parvus are genetically distinct from those in India, with no shared haplotypes between the two regions.

Dahanukar explained that this level of differentiation, despite relatively recent geological separation, highlights how quickly freshwater species can diverge when isolated.

Meanwhile, Raghavan pointed out that these findings reinforce the importance of conserving habitats across both countries, as each region harbours unique genetic diversity.

Implications for conservation

The study carries important implications for conservation, particularly in a country like Sri Lanka where freshwater ecosystems are under increasing pressure from development, pollution, and climate change.

Ranasinghe stressed that understanding genetic diversity is key to protecting species effectively.

“If we treat all populations as identical, we risk losing unique genetic lineages,” he warned. “Conservation planning must recognise these hidden differences.”

Sri Lanka is already recognised as a global biodiversity hotspot, but studies like this suggest that its biological richness may be even greater than previously thought.

A broader scientific shift

The research also contributes to a growing body of work by scientists such as Sudasinghe and Meegaskumbura, challenging traditional assumptions about species distributions in the region.

Earlier studies often assumed that many freshwater fish species were shared uniformly between India and Sri Lanka. However, modern genetic tools are revealing a far more complex picture—one shaped by ancient geography, climatic shifts, and evolutionary processes.

“We are moving from a simplistic view of biodiversity to a much more nuanced understanding,” Ranasinghe said. “And Sri Lanka is proving to be a fascinating natural laboratory for this kind of research.”

Looking ahead

The researchers emphasise that much remains to be explored, with several freshwater fish groups in Sri Lanka still poorly understood at the genetic level.

For Sri Lanka, the message is clear: beneath its rivers, tanks, and wetlands lies a largely untapped reservoir of evolutionary history.

As Ranasinghe puts it:

“Every stream could hold a story of millions of years in the making. We are only just beginning to read them.”

By Ifham Nizam

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