Features
New research reveals drought’s dual impact on flowering plants and pollinators
by Ifham Nizam
In a world grappling with the realities of climate change, understanding how plants adapt to environmental stressors is more critical than ever. A groundbreaking study led by Dr. Kaushalya Rathnayake and Amy L. Parachnowitsch at the University of New Brunswick offers compelling insights into how drought influences the evolution of floral traits in Brassica rapa, commonly known as field mustard.
Published in the Annals of Botany, the study reveals the dual pressures exerted by drought and pollinators on the plant’s evolution. The researchers used controlled experiments to manipulate water availability and pollination methods, simulating real-world scenarios where plants must adapt to survive.
Speaking to The Island, Dr. Rathnayake added: “Drought isn’t just a physical stressor—it’s an evolutionary force.” The research found that drought conditions strongly select for earlier flowering. This adaptation, known as “drought escape,” allows plants to complete their lifecycle quickly before resources are depleted.
However, he said that this survival strategy comes at a cost. Plants exposed to drought produced fewer flowers and seeds compared to those in well-watered conditions. Despite these reductions, pollinators continued to influence flower size, suggesting that even under stress, the relationship between plants and pollinators remains pivotal.
“Our results show that drought not only changes plant traits but also alters how natural selection acts on those traits,” he noted.
The study also highlights the critical role of pollinators in shaping floral characteristics. While drought drove selection for earlier flowering, pollinators influenced flower size, favouring larger flowers even in water-stressed conditions. “Pollinators seem to prefer larger flowers, and this preference drives their evolution, regardless of the challenges posed by drought,” Dr. Rathnayake added.
Interestingly, the researchers found that plants subjected to hand pollination did not perform as well as those left to natural pollination, suggesting that human interventions might not always replicate the nuanced relationships plants share with their pollinators.
Implications for agriculture and biodiversity
These findings have far-reaching implications for agriculture and conservation. As climate change intensifies, understanding how plants adapt to stressors like drought is crucial for developing resilient crop varieties. “Our work provides a framework for predicting how plants might respond to future environmental challenges,” said Dr. Rathnayake.
The research also underscores the importance of conserving pollinator populations. “Pollinators are not just visitors; they are active participants in the evolutionary process,” added Amy Parachnowitsch, the study’s co-author.
The study serves as a reminder of the complex interplay between environmental and biological factors in shaping ecosystems. As climate change alters precipitation patterns and increases the frequency of droughts, plants like B. rapa will continue to evolve. The question remains: will they adapt quickly enough to keep pace with a rapidly changing world?
By combining scientific rigour with ecological insight, Rathnayake and Parachnowitsch’s work sheds light on the mechanisms of plant resilience, offering hope and direction in the face of global climate challenges.
Drought and Evolution: How Kaushalya unveils Nature’s adaptive dance
As climate change tightens its grip on ecosystems worldwide, drought has emerged as one of its most devastating symptoms. Beyond its visible impacts on agriculture and water resources, drought silently shapes the evolution of plants and their relationships with pollinators. In a pioneering study, Kaushalya Rathnayake, an evolutionary ecologist, sheds light on these intricate dynamics. His research on Brassica rapa offers profound insights into how plants adapt to water scarcity while negotiating their dependence on pollinators.
The evolutionary adaptations to drought
“Drought is more than a stressor; it’s a driver of evolution,” Dr. Rathnayake explained. His research reveals that in water-scarce environments, plants accelerate their life cycles, prioritiaing reproduction over growth. “We found that plants experiencing drought conditions tend to flower earlier than those in well-watered environments,” he said.
This evolutionary strategy ensures that plants can produce seeds before resources are completely depleted. Dr. Rathnayake’s experiments with Brassica rapa, a plant known for its short lifecycle, demonstrated how environmental pressures like drought independently drive selection for earlier flowering. “It’s nature’s way of adapting to a harsh reality,” he added.
While drought influences when plants flower, pollinators shape how they bloom. The research also delves into the role of pollinators during periods of water scarcity. “Pollinators become more selective when floral resources are limited, favouring larger, more attractive flowers,” he explained. This behaviour exerts evolutionary pressure, encouraging plants to develop traits that maximise their appeal to pollinators despite challenging conditions.
These dual influences – drought and pollinators – highlight the complexity of plant survival strategies. Rathnayake emphasised, “The interplay between abiotic stressors like drought and biotic agents like pollinators is key to understanding plant evolution in a changing climate.”
A Lifetime of ecological curiosity
Kaushalya Rathnayake’s journey into the world of biodiversity began in the lush landscapes of Kandy, Sri Lanka. Inspired by the rich flora and fauna of his homeland, he pursued a degree in biodiversity conservation at the Rajarata University. His early work focused on pollination networks in Sri Lanka’s dry zones, laying the foundation for his future studies.
After contributing to environmental initiatives in Sri Lanka, Rathnayake moved to Canada to advance his academic pursuits. At Memorial University, he explored the interactions between mosses and flies. Now, as a PhD graduate from the University of New Brunswick, Dr. Rathnayake applies his expertise to both research and industry. He works as an Integrated Pest Management Specialist and shares his knowledge as a sessional instructor.
Implications for global biodiversity
Rathnayake’s findings have far-reaching implications. “If drought continues to drive earlier flowering and pollinator relationships become mismatched, entire ecosystems could destabilise,” he warned. Such mismatches could lead to reduced crop yields, threatening food security.
He advocates for a multi-pronged approach to tackle these challenges. “We need policies that address water scarcity, promote sustainable agricultural practices, and protect pollinator populations,” he urged.
As ecosystems face increasing pressure from climate change, Rathnayake’s research serves as a clarion call. By unraveling the intricate connections between plants and their environment, he underscores the urgent need for collective action. “The survival of biodiversity hinges on understanding these dynamics and acting swiftly to mitigate their impacts,” he concluded.
Through his work, Rathnayake exemplifies how curiosity and dedication can illuminate the path to sustainability, reminding us that every small action matters in preserving the intricate web of life on Earth.
Double Whammy: Drought and pollinator mismatch
Flowering plants (angiosperms) rely heavily on pollinators like bees for reproduction and genetic exchange. However, with increasing water scarcity and prolonged droughts becoming a global phenomenon, both plants and their pollinators are experiencing significant disruptions.
The study highlights how water stress alters flower morphology, blooming patterns, and pollinator interactions. Flowers under drought conditions bloom earlier, produce fewer blossoms, and often exhibit changes in shape and size. These alterations not only reduce the plants’ reproductive success but also confuse pollinators, who struggle to recognize the flowers they depend on for food.

Dr. Amy Parachnowitsch, Associate professor, Department of Biology, University of New Brunswick, Fredericton, NB Canada
Key Findings from the Study
Earlier flowering under drought:
Plants exposed to water scarcity accelerated their life cycle, prioritising reproduction over prolonged growth. This adaptation helps them ensure the survival of their genetic material in challenging environments.
Selective pollinator preferences:
During drought, pollinators showed increased selectivity, preferring larger and more conspicuous flowers. This suggests that only plants that adapt their floral traits to attract pollinators may thrive under water-scarce conditions.
Reduced yield and biodiversity risks:
Drought drastically reduced flower, fruit, and seed production. This not only threatens agricultural yields but also endangers plant species’ long-term survival and biodiversity.
Why this research matters
This study bridges the gap between climate change, ecology, and evolution. It underscores the cascading effects of drought on ecosystems, from disrupting the balance between plants and pollinators to threatening agricultural productivity and biodiversity.
Implications for conservation and agriculture
The findings call for urgent attention to climate-resilient agricultural practices and ecosystem conservation strategies. Protecting pollinators and ensuring sustainable water management are critical to maintaining the delicate balance of ecosystems.
Features
Cyclones, greed and philosophy for a new world order
Further to my earlier letter titled, “Psychology of Greed and Philosophy for a New World Order” (The Island 26.11.2025) it may not be far-fetched to say that the cause of the devastating cyclones that hit Sri Lanka and Indonesia last week could be traced back to human greed. Cyclones of this magnitude are said to be unusual in the equatorial region but, according to experts, the raised sea surface temperatures created the conditions for their occurrence. This is directly due to global warming which is caused by excessive emission of Greenhouse gases due to burning of fossil fuels and other activities. These activities cannot be brought under control as the rich, greedy Western powers do not want to abide by the terms and conditions agreed upon at the Paris Agreement of 2015, as was seen at the COP30 meeting in Brazil recently. Is there hope for third world countries? This is why the Global South must develop a New World Order. For this purpose, the proposed contentment/sufficiency philosophy based on morals like dhana, seela, bhavana, may provide the necessary foundation.
Further, such a philosophy need not be parochial and isolationist. It may not be necessary to adopt systems that existed in the past that suited the times but develop a system that would be practical and also pragmatic in the context of the modern world.
It must be reiterated that without controlling the force of collective greed the present destructive socioeconomic system cannot be changed. Hence the need for a philosophy that incorporates the means of controlling greed. Dhana, seela, bhavana may suit Sri Lanka and most of the East which, as mentioned in my earlier letter, share a similar philosophical heritage. The rest of the world also may have to adopt a contentment / sufficiency philosophy with strong and effective tenets that suit their culture, to bring under control the evil of greed. If not, there is no hope for the existence of the world. Global warming will destroy it with cyclones, forest fires, droughts, floods, crop failure and famine.
Leading economists had commented on the damaging effect of greed on the economy while philosophers, ancient as well as modern, had spoken about its degenerating influence on the inborn human morals. Ancient philosophers like Plato, Aristotle, and Epicurus all spoke about greed, viewing it as a destructive force that hindered a good life. They believed greed was rooted in personal immorality and prevented individuals from achieving true happiness by focusing on endless material accumulation rather than the limited wealth needed for natural needs.
Jeffry Sachs argues that greed is a destructive force that undermines social and environmental well-being, citing it as a major driver of climate change and economic inequality, referencing the ideas of Adam Smith, John Maynard Keynes, etc. Joseph Stiglitz, a Nobel Laureate economist, has criticised neoliberal ideology in similar terms.
In my earlier letter, I have discussed how contentment / sufficiency philosophy could effectively transform the socioeconomic system to one that prioritises collective well-being and sufficiency over rampant consumerism and greed, potentially leading to more sustainable economic models.
Obviously, these changes cannot be brought about without a change of attitude, morals and commitment of the rulers and the government. This cannot be achieved without a mass movement; people must realise the need for change. Such a movement would need leadership. In this regard a critical responsibility lies with the educated middle class. It is they who must give leadership to the movement that would have the goal of getting rid of the evil of excessive greed. It is they who must educate the entire nation about the need for these changes.
The middle class would be the vanguard of change. It is the middle class that has the capacity to bring about change. It is the middle class that perform as a vibrant component of the society for political stability. It is the group which supplies political philosophy, ideology, movements, guidance and leaders for the rest of the society. The poor, who are the majority, need the political wisdom and leadership of the middle class.
Further, the middle class is the font of culture, creativity, literature, art and music. Thinkers, writers, artistes, musicians are fostered by the middle class. Cultural activity of the middle class could pervade down to the poor groups and have an effect on their cultural development as well. Similarly, education of a country depends on how educated the middle class is. It is the responsibility of the middle class to provide education to the poor people.
Most importantly, the morals of a society are imbued in the middle class and it is they who foster them. As morals are crucial in the battle against greed, the middle class assume greater credentials to spearhead the movement against greed and bring in sustainable development and growth. Contentment sufficiency philosophy, based on morals, would form the strong foundation necessary for achieving the goal of a new world order. Thus, it is seen that the middle class is eminently suitable to be the vehicle that could adopt and disseminate a contentment/ sufficiency philosophy and lead the movement against the evil neo-liberal system that is destroying the world.
The Global South, which comprises the majority of the world’s poor, may have to realise, before it is too late, that it is they who are the most vulnerable to climate change though they may not be the greatest offenders who cause it. Yet, if they are to survive, they must get together and help each other to achieve self-sufficiency in the essential needs, like food, energy and medicine. Trade must not be via exploitative and weaponised currency but by means of a barter system, based on purchase power parity (PPP). The union of these countries could be an expansion of organisations,like BRICS, ASEAN, SCO, AU, etc., which already have the trade and financial arrangements though in a rudimentary state but with great potential, if only they could sort out their bilateral issues and work towards a Global South which is neither rich nor poor but sufficient, contented and safe, a lesson to the Global North. China, India and South Africa must play the lead role in this venture. They would need the support of a strong philosophy that has the capacity to fight the evil of greed, for they cannot achieve these goals if fettered by greed. The proposed contentment / sufficient philosophy would form a strong philosophical foundation for the Global South, to unite, fight greed and develop a new world order which, above all, will make it safe for life.
by Prof. N. A. de S. Amaratunga
PHD, DSc, DLITT
Features
SINHARAJA: The Living Cathedral of Sri Lanka’s Rainforest Heritage
When Senior biodiversity scientist Vimukthi Weeratunga speaks of Sinharaja, his voice carries the weight of four decades spent beneath its dripping emerald canopy. To him, Sri Lanka’s last great rainforest is not merely a protected area—it is “a cathedral of life,” a sanctuary where evolution whispers through every leaf, stream and shadow.
“Sinharaja is the largest and most precious tropical rainforest we have,” Weeratunga said.
“Sixty to seventy percent of the plants and animals found here exist nowhere else on Earth. This forest is the heart of endemic biodiversity in Sri Lanka.”
A Magnet for the World’s Naturalists
Sinharaja’s allure lies not in charismatic megafauna but in the world of the small and extraordinary—tiny, jewel-toned frogs; iridescent butterflies; shy serpents; and canopy birds whose songs drift like threads of silver through the mist.
“You must walk slowly in Sinharaja,” Weeratunga smiled.
“Its beauty reveals itself only to those who are patient and observant.”
For global travellers fascinated by natural history, Sinharaja remains a top draw. Nearly 90% of nature-focused visitors to Sri Lanka place Sinharaja at the top of their itinerary, generating a deep economic pulse for surrounding communities.
A Forest Etched in History
Centuries before conservationists championed its cause, Sinharaja captured the imagination of explorers and scholars. British and Dutch botanists, venturing into the island’s interior from the 17th century onward, mapped streams, documented rare orchids, and penned some of the earliest scientific records of Sri Lanka’s natural heritage.
These chronicles now form the backbone of our understanding of the island’s unique ecology.
The Great Forest War: Saving Sinharaja
But Sinharaja nearly vanished.
In the 1970s, the government—guided by a timber-driven development mindset—greenlit a Canadian-assisted logging project. Forests around Sinharaja fell first; then, the chainsaws approached the ancient core.
“There was very little scientific data to counter the felling,” Weeratunga recalled.
- Poppie’s shrub frog
- Endemic Scimitar babblers
- Blue Magpie
“But people knew instinctively this was a national treasure.”
The public responded with one of the greatest environmental uprisings in Sri Lankan history. Conservation icons Thilo Hoffmann and Neluwe Gunananda Thera led a national movement. After seven tense years, the new government of 1977 halted the project.
What followed was a scientific renaissance. Leading researchers—including Prof. Savithri Gunathilake and Prof. Nimal Gunathilaka, Prof. Sarath Kottagama, and others—descended into the depths of Sinharaja, documenting every possible facet of its biodiversity.
“Those studies paved the way for Sinharaja to become Sri Lanka’s very first natural World Heritage Site,” Weeratunga noted proudly.
- Vimukthi
- Nadika
- Janaka
A Book Woven From 30 Years of Field Wisdom
For Weeratunga, Sinharaja is more than academic terrain—it is home. Since joining the Forest Department in 1985 as a young researcher, he has trekked, photographed, documented and celebrated its secrets.
Now, decades later, he joins Dr. Thilak Jayaratne, the late Dr. Janaka Gallangoda, and Nadika Hapuarachchi in producing, what he calls, the most comprehensive book ever written on Sinharaja.
“This will be the first major publication on Sinharaja since the early 1980s,” he said.
“It covers ecology, history, flora, fauna—and includes rare photographs taken over nearly 30 years.”
Some images were captured after weeks of waiting. Others after years—like the mysterious mass-flowering episodes where clusters of forest giants bloom in synchrony, or the delicate jewels of the understory: tiny jumping spiders, elusive amphibians, and canopy dwellers glimpsed only once in a lifetime.
The book even includes underwater photography from Sinharaja’s crystal-clear streams—worlds unseen by most visitors.
A Tribute to a Departed Friend
Halfway through the project, tragedy struck: co-author Dr. Janaka Gallangoda passed away.
“We stopped the project for a while,” Weeratunga said quietly.
“But Dr. Thilak Jayaratne reminded us that Janaka lived for this forest. So we completed the book in his memory. One of our authors now watches over Sinharaja from above.”
An Invitation to the Public
A special exhibition, showcasing highlights from the book, will be held on 13–14 December, 2025, in Colombo.
“We cannot show Sinharaja in one gallery,” he laughed.
“But we can show a single drop of its beauty—enough to spark curiosity.”
A Forest That Must Endure
What makes the book special, he emphasises, is its accessibility.
“We wrote it in simple, clear language—no heavy jargon—so that everyone can understand why Sinharaja is irreplaceable,” Weeratunga said.
“If people know its value, they will protect it.”
To him, Sinharaja is more than a rainforest.
It is Sri Lanka’s living heritage.
A sanctuary of evolution.
A sacred, breathing cathedral that must endure for generations to come.
By Ifham Nizam
Features
How Knuckles was sold out
Leaked RTI Files Reveal Conflicting Approvals, Missing Assessments, and Silent Officials
“This Was Not Mismanagement — It Was a Structured Failure”— CEJ’s Dilena Pathragoda
An investigation, backed by newly released Right to Information (RTI) files, exposes a troubling sequence of events in which multiple state agencies appear to have enabled — or quietly tolerated — unauthorised road construction inside the Knuckles Conservation Forest, a UNESCO World Heritage site.
At the centre of the unfolding scandal is a trail of contradictory letters, unexplained delays, unsigned inspection reports, and sudden reversals by key government offices.
“What these documents show is not confusion or oversight. It is a structured failure,” said Dilena Pathragoda, Executive Director of the Centre for Environmental Justice (CEJ), who has been analysing the leaked records.
“Officials knew the legal requirements. They ignored them. They knew the ecological risks. They dismissed them. The evidence points to a deliberate weakening of safeguards meant to protect one of Sri Lanka’s most fragile ecosystems.”
A Paper Trail of Contradictions
RTI disclosures obtained by activists reveal:
Approvals issued before mandatory field inspections were carried out
Three departments claiming they “did not authorise” the same section of the road
A suspiciously backdated letter clearing a segment already under construction
Internal memos flagging “missing evaluation data” that were never addressed
“No-objection” notes do not hold any legal weight for work inside protected areas, experts say.
One senior officer’s signature appears on two letters with opposing conclusions, sent just three weeks apart — a discrepancy that has raised serious questions within the conservation community.
“This is the kind of documentation that usually surfaces only after damage is done,” Pathragoda said. “It shows a chain of administrative behaviour designed to delay scrutiny until the bulldozers moved in.”
The Silence of the Agencies
Perhaps, more alarming is the behaviour of the regulatory bodies.
Multiple departments — including those legally mandated to halt unauthorised work — acknowledged concerns in internal exchanges but issued no public warnings, took no enforcement action, and allowed machinery to continue operating.
“That silence is the real red flag,” Pathragoda noted.
“Silence is rarely accidental in cases like this. Silence protects someone.”
On the Ground: Damage Already Visible
Independent field teams report:
Fresh erosion scars on steep slopes
Sediment-laden water in downstream streams
Disturbed buffer zones
Workers claiming that they were instructed to “complete the section quickly”
Satellite images from the past two months show accelerated clearing around the contested route.
Environmental experts warn that once the hydrology of the Knuckles slopes is altered, the consequences could be irreversible.
CEJ: “Name Every Official Involved”
CEJ is preparing a formal complaint demanding a multi-agency investigation.
Pathragoda insists that responsibility must be traced along the entire chain — from field officers to approving authorities.
“Every signature, every omission, every backdated approval must be examined,” she said.
“If laws were violated, then prosecutions must follow. Not warnings. Not transfers. Prosecutions.”
A Scandal Still Unfolding
More RTI documents are expected to come out next week, including internal audits and communication logs that could deepen the crisis for several agencies.
As the paper trail widens, one thing is increasingly clear: what happened in Knuckles is not an isolated act — it is an institutional failure, executed quietly, and revealed only because citizens insisted on answers.
by Ifham Nizam
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