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	<title>Sumatra &#8211; Science</title>
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	<title>Sumatra &#8211; Science</title>
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		<title>Palm Oil Smallholders Left Out of Corporate Zero-Deforestation Pledges, Study Finds</title>
		<link>https://scienmag.com/palm-oil-smallholders-left-out-of-corporate-zero-deforestation-pledges-study-finds/</link>
		
		<dc:creator><![CDATA[Courtney Benton]]></dc:creator>
		<pubDate>Fri, 09 Oct 2026 17:24:07 +0000</pubDate>
				<category><![CDATA[Policy]]></category>
		<category><![CDATA[Science News]]></category>
		<category><![CDATA[care-based support]]></category>
		<category><![CDATA[community-company relations]]></category>
		<category><![CDATA[community-company relations in palm oil sector]]></category>
		<category><![CDATA[corporate supply chain transparency]]></category>
		<category><![CDATA[corporate sustainability]]></category>
		<category><![CDATA[deforestation and smallholder farmers]]></category>
		<category><![CDATA[impact of NDPE commitments on local communities]]></category>
		<category><![CDATA[Indonesia]]></category>
		<category><![CDATA[Indonesia oil palm farming]]></category>
		<category><![CDATA[NDPE]]></category>
		<category><![CDATA[oil palm smallholders]]></category>
		<category><![CDATA[Palm oil smallholders]]></category>
		<category><![CDATA[palm oil supply chains]]></category>
		<category><![CDATA[PLOS Sustainability and Transformation]]></category>
		<category><![CDATA[procedural equity]]></category>
		<category><![CDATA[rainforest conservation]]></category>
		<category><![CDATA[small-scale farmers and environmental protection]]></category>
		<category><![CDATA[smallholder inclusion in environmental policies]]></category>
		<category><![CDATA[social equity in sustainability pledges]]></category>
		<category><![CDATA[Sumatra]]></category>
		<category><![CDATA[supply chain governance]]></category>
		<category><![CDATA[sustainability challenges in palm oil industry]]></category>
		<category><![CDATA[zero-deforestation commitments]]></category>
		<guid isPermaLink="false">https://scienmag.com/?p=255081</guid>

					<description><![CDATA[Field research in Sumatra shows that corporate zero-deforestation commitments in the palm oil sector suffer from procedural inequity and neglect of historical company-community relationships, prompting calls to embed care-based support into sustainability policy.]]></description>
										<content:encoded><![CDATA[<p>When multinational companies promise to purge deforestation from their supply chains, the fate of the world&#8217;s rainforests is often framed as a negotiation between corporate boardrooms and environmental campaigners. Yet a new study published in PLOS Sustainability and Transformation argues that the people most directly affected by these pledges, the smallholder farmers who cultivate much of the world&#8217;s oil palm, have been largely written out of the story. Drawing on extensive fieldwork in Sumatra, Indonesia, researchers Adelina Chandra, Janina Grabs, Eva-Marie Meemken and Rachael D. Garrett reveal deep fractures in the relationships between companies and communities, and they make the case that zero-deforestation commitments will keep falling short unless they are rebuilt around principles of equity, recognition and care.</p>
<p>Zero-deforestation commitments, commonly abbreviated as ZDCs, have proliferated over the past decade as companies have sought to decouple commodity production from forest loss. Many of the most ambitious pledges are framed as NDPE commitments, standing for No Deforestation, No Peat and No Exploitation, a formulation that explicitly links environmental protection with social safeguards. On paper, these promises cover millions of hectares of tropical landscape. In practice, the study finds, they are designed almost exclusively by powerful downstream actors, such as traders, refiners and consumer goods manufacturers, without meaningful involvement of the upstream, non-industrial producers whose livelihoods and land access are shaped, both directly and indirectly, by the resulting rules.</p>
<p>To understand how these commitments land on the ground, the research team turned to the communities themselves. In two provinces in Sumatra, Indonesia, they conducted 28 focus group discussions with oil palm smallholders, cooperatives and other local stakeholders, alongside 25 expert interviews with individuals familiar with the dynamics of the palm oil sector. This bottom-up approach is unusual in a literature dominated by audits, certification data and corporate sustainability reports, and it allowed the researchers to capture how farmers experience the policies that govern their market access, rather than how those policies are described from headquarters.</p>
<p>The findings point to significant gaps in what the authors describe as procedural equity, the fairness of the processes through which decisions are made and grievances are addressed. Communities reported inadequate mechanisms for voicing concerns when company policies affected them, insufficient procedures for meaningful participation in the design and rollout of sustainability initiatives, and a striking lack of attention to how implementation was expected to proceed. In other words, smallholders were often told what new rules meant for their crops and their contracts, but they were rarely consulted about whether those rules made sense in their specific circumstances, or given credible channels to push back when they did not.</p>
<p>Procedural inequity is not merely a matter of hurt feelings or bad manners in corporate-community relations. It has material consequences. When smallholders lack information about which buyers will accept their fruit, or why a cooperative has been flagged for non-compliance, they face uncertainty that can depress prices, push production toward less scrupulous intermediaries, or drive land-use change into more vulnerable forests. The study suggests that the architecture of ZDCs, by concentrating decision-making power downstream, can reproduce precisely the exclusions that sustainability policies claim to remedy, leaving the farmers who are asked to change their practices with little ownership over the change itself.</p>
<p>Perhaps the study&#8217;s most important contribution is its insistence that history matters. The authors uncover what they call a critical need to recognise historical and ongoing relationships between communities and companies when designing corporate sustainability policies. In Sumatra, many communities have long, complicated entanglements with palm oil companies, involving land acquisitions, promises of development, employment arrangements and episodes of conflict. A zero-deforestation commitment that arrives as if on a blank slate, ignoring these accumulated relationships, is likely to be received with suspicion or indifference. Conversely, policies that acknowledge past grievances and build on existing social ties may find far more traction.</p>
<p>This relational perspective leads the researchers to propose a conceptual expansion of how equity is understood in supply chain governance. Equity, they argue, should be treated as an evolving concept, one that ideally should be shaped by contextual realities rather than fixed in advance by corporate checklists. Standard frameworks tend to emphasise distributional questions, such as who bears the costs of conservation and who reaps the benefits, and procedural questions, such as who gets a seat at the table. The study does not discard these dimensions but argues that they are incomplete without attention to the quality of the relationships themselves, including trust, recognition and mutual obligation.</p>
<p>From this insight flows the paper&#8217;s central recommendation: the integration of relational aspects and care-based support into zero-deforestation commitments. Care-based support, in this framing, means that companies would move beyond compliance monitoring toward actively supporting the communities on whom their supply bases depend, providing resources, flexibility and responsiveness attuned to local needs. Rather than treating smallholders primarily as risks to be audited, companies would treat them as partners whose wellbeing is integral to environmental outcomes. The authors position this as a complement to the current understanding of equity, not a replacement, adding a dimension that recognises vulnerability, dependence and the ethical significance of long-term relationships.</p>
<p>The implications extend well beyond Indonesian palm oil. Zero-deforestation commitments now span cocoa, soy, beef, timber and other commodities, and regulatory instruments in major consumer markets are increasingly hard-wiring such commitments into law. If the Sumatran evidence is representative, the effectiveness of this entire governance wave may hinge on factors that rarely appear in sustainability dashboards: whether farmers feel heard, whether companies honour relationships built over decades, and whether implementation procedures are designed with, rather than for, the people on the ground. The study&#8217;s bottom-up methodology offers a template for testing that proposition in other landscapes.</p>
<p>For the researchers, the message is ultimately one of redesign rather than rejection. They do not argue that corporate zero-deforestation commitments are futile; indeed, their concern is that these commitments will underdeliver unless the social fabric of producing regions is taken seriously. By weaving procedural fairness, historical recognition and care-based support into the design of ZDCs, companies and policymakers could align environmental ambition with the lived realities of smallholder producers. In the oil palm landscapes of Sumatra, where global supply chains meet village livelihoods, that alignment may determine whether the next decade of deforestation-free promises becomes reality or remains another pledge written far from the forest&#8217;s edge.</p>
<p><strong>Subject of Research:</strong> Equity and community relations in corporate zero-deforestation commitments in Indonesia&#x27;s palm oil sector</p>
<p><strong>Article Title:</strong> Relational aspects and care-based support in Zero-Deforestation Commitments</p>
<p><strong>Article References:</strong> Chandra, A., Grabs, J., Meemken, E.-M., &amp; Garrett, R. D. (2026). Relational aspects and care-based support in Zero-Deforestation Commitments. <em>PLOS Sustainability and Transformation, 5</em>(5), e0000235. <a href="https://doi.org/10.1371/journal.pstr.0000235" rel="noopener noreferrer">https://doi.org/10.1371/journal.pstr.0000235</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> <a href="https://doi.org/10.1371/journal.pstr.0000235" rel="noopener noreferrer">10.1371/journal.pstr.0000235</a></p>
<p><strong>Keywords:</strong> zero-deforestation commitments, oil palm smallholders, Indonesia, Sumatra, palm oil supply chains, procedural equity, NDPE, corporate sustainability, care-based support, community-company relations, supply chain governance, PLOS Sustainability and Transformation</p>
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		<post-id xmlns="com-wordpress:feed-additions:1">255081</post-id>	</item>
		<item>
		<title>Rare Equatorial Cyclone Senyar Flooded Over 100,000 Hectares of Sumatran Rice Fields, Satellite Analysis Reveals</title>
		<link>https://scienmag.com/rare-equatorial-cyclone-senyar-flooded-over-100000-hectares-of-sumatran-rice-fields-satellite-analysis-reveals/</link>
		
		<dc:creator><![CDATA[Alan Morgan]]></dc:creator>
		<pubDate>Thu, 08 Oct 2026 23:32:27 +0000</pubDate>
				<category><![CDATA[Earth Science]]></category>
		<category><![CDATA[catastrophic flooding in Aceh and North Sumatra]]></category>
		<category><![CDATA[climate anomalies near the equator]]></category>
		<category><![CDATA[disaster assessment]]></category>
		<category><![CDATA[effects of extreme weather events on agriculture]]></category>
		<category><![CDATA[equatorial cyclone formation]]></category>
		<category><![CDATA[flood mapping]]></category>
		<category><![CDATA[Food security]]></category>
		<category><![CDATA[impact on Indonesian rice fields]]></category>
		<category><![CDATA[Indonesia]]></category>
		<category><![CDATA[Indonesian disaster response]]></category>
		<category><![CDATA[near-equatorial cyclone]]></category>
		<category><![CDATA[paddy fields]]></category>
		<category><![CDATA[rice crop loss estimation]]></category>
		<category><![CDATA[rice production loss]]></category>
		<category><![CDATA[satellite analysis of floodwaters]]></category>
		<category><![CDATA[satellite-based flood mapping]]></category>
		<category><![CDATA[Sentinel-1]]></category>
		<category><![CDATA[Sentinel-1 radar imagery]]></category>
		<category><![CDATA[Sumatra]]></category>
		<category><![CDATA[Sumatra flooding]]></category>
		<category><![CDATA[synthetic-aperture radar]]></category>
		<category><![CDATA[Tropical Cyclone Senyar]]></category>
		<category><![CDATA[UNOSAT]]></category>
		<guid isPermaLink="false">https://scienmag.com/?p=250441</guid>

					<description><![CDATA[Using Sentinel-1 radar imagery and Indonesia's official paddy field registry, researchers found that rare equatorial Tropical Cyclone Senyar flooded over 102,000 hectares of rice land in Sumatra, with field checks suggesting the true toll was even higher.]]></description>
										<content:encoded><![CDATA[<p>In November 2025, something extraordinary happened over the warm waters of the Strait of Malacca: a tropical cyclone formed almost directly on the equator. Tropical Cyclone Senyar, one of only a handful of near-equatorial cyclones ever documented in the region, unleashed exceptional rainfall across northwestern Sumatra, triggering catastrophic flooding in Aceh, North Sumatra, and West Sumatra. The disaster struck some of Indonesia&#8217;s most productive rice-growing regions, and the human toll was severe, with Indonesian authorities reporting hundreds of deaths and many more people missing. Now, a large team of Indonesian researchers has published the first comprehensive satellite-based accounting of what that floodwater did to the nation&#8217;s rice supply, and their numbers are sobering.</p>
<p>The study, conducted by scientists at Indonesia&#8217;s National Research and Innovation Agency (BRIN) together with colleagues from government agencies and universities, was published in Theoretical and Applied Climatology. Led by Anny Mulyani and Destika Cahyana, the team combined radar imagery from the European Sentinel-1 satellite with Indonesia&#8217;s official 2024 paddy field registry, known as the LBS dataset, to map exactly which rice fields were inundated and to estimate how much of the harvest was lost. Their conclusion: roughly 102,189 hectares of paddy fields were flooded, about 14.53 percent of all officially registered rice land in the affected study area.</p>
<p>The technical heart of the approach lies in synthetic aperture radar, or SAR. Unlike optical satellites, which are blinded by the thick storm clouds that accompany cyclones, SAR instruments bounce microwave pulses off the Earth&#8217;s surface and measure the reflected signal. Smooth, open water acts like a mirror, reflecting radar energy away from the satellite and appearing dark in the resulting image, while vegetated fields scatter the signal back brightly. This contrast makes SAR exceptionally well suited to flood mapping during active disasters. The researchers used pre-processed Sentinel-1 flood products supplied by UNOSAT, the United Nations&#8217; operational satellite mapping service, and overlaid them on the official paddy field boundaries to isolate flooded cropland from flooded forest, villages, and roads.</p>
<p>Overlaying satellite flood maps on agricultural registers sounds simple, but the accuracy of the result depends entirely on the quality of both layers. The LBS dataset, produced by Indonesia&#8217;s Ministry of Agrarian Affairs and Spatial Planning, provides the authoritative footprint of where rice is legally and actually cultivated. By restricting the flood analysis to these verified boundaries, the team avoided the common pitfall of counting flooded scrubland or fish ponds as lost rice production. To check how well the satellite method performed on the ground, the researchers validated their maps against 150 field observation points collected by local agricultural officers in the three affected provinces.</p>
<p>The spatial pattern of destruction was strikingly uneven. Flood impacts concentrated in the lowland alluvial plains and the downstream reaches of river basins, particularly in eastern Aceh and eastern North Sumatra, where rivers swollen by Senyar&#8217;s rains spilled over their banks and spread across the flat coastal farmland. This geography is no accident: rice paddies are deliberately situated on flat, water-rich alluvial soils, the very terrain that cyclone-driven flooding inundates most thoroughly and most persistently. The study&#8217;s authors note that detection performance varied between provinces and was strongly influenced by topography, local hydrological conditions, and how long floodwater remained standing on the fields.</p>
<p>Field verification revealed an important bias in the satellite numbers. Ground assessments suggested the true flooded area reached approximately 139,040 hectares, meaning the Sentinel-1-based estimate of 102,189 hectares was conservative, undercounting the damage by more than a quarter. Several factors can explain this gap. Rapidly receding floodwater may dry out between satellite passes, leaving no radar signature by the time the next image is acquired. Dense rice canopy can mask standing water beneath it, since the radar signal scatters off the leaves rather than reaching the flooded soil below. And in areas of prolonged, deep inundation, the boundary between flooded field and saturated mud becomes spectrally ambiguous. The lesson, the authors argue, is that satellite emergency mapping captures the spatial distribution of damage very well but still needs field verification to pin down the total magnitude.</p>
<p>Flooded does not necessarily mean destroyed, and the team went a step further by classifying damage severity. Combining the satellite extent with field-based assessments of crop condition, they estimated that moderate to severe damage affected approximately 76,318 hectares of paddy fields. Translating that damaged area into lost harvest, they calculated a production loss of roughly 412,607 tons of dry unhusked paddy, the standard measure of Indonesian rice output. For a country that is the world&#8217;s largest rice importer by some measures and where rice price stability is a core political concern, a loss of that size from a single event in three provinces is economically and politically significant.</p>
<p>Senyar itself deserves attention as a meteorological rarity. Tropical cyclones generally require a minimum distance from the equator, because the Coriolis effect, the apparent deflection of moving air caused by Earth&#8217;s rotation, is what gives cyclones their spin. Within about five degrees of the equator, that effect nearly vanishes. Yet Senyar developed in the Strait of Malacca close to the equator, echoing Typhoon Vamei, which formed nearby in 2001 and remains the textbook example of a near-equatorial cyclone. Researchers have linked such events to unusual wind patterns and vorticity in the strait, and some climate scientists warn that warming seas and shifting circulation patterns could make rare cyclone tracks in Southeast Asia more consequential in the future. The cyclone&#8217;s extreme rainfall also interacted with the landscape: separate analyses by Indonesian academics have pointed to upstream forest degradation in Sumatra&#8217;s watersheds as a factor that amplified flash flooding downstream.</p>
<p>The wider scientific context makes the Sumatra case study more than a local disaster report. Global research has repeatedly identified rice as the crop most exposed to flood damage, and recent studies have documented that severe floods measurably reduce rice yields worldwide. Rice plants can survive submergence for only limited periods, and varieties bred with submergence-tolerance genes, such as the Sub1 lines developed for flood-prone South and Southeast Asia, offer partial protection but not immunity to week-long inundation. As climate change alters tropical cyclone trajectories and intensifies extreme rainfall across Southeast Asia, the authors argue that lowland rice systems, which feed hundreds of millions of people, are among the most vulnerable agricultural assets on the planet.</p>
<p>What the BRIN team has delivered, in effect, is a template for rapid agricultural damage assessment that any flood-prone nation could adopt. The workflow is deliberately operational: take freely available Sentinel-1 radar imagery, use a trusted emergency mapping product such as UNOSAT&#8217;s, intersect it with an official cropland registry, and validate with a modest number of ground-truth points. The whole analysis can be completed within days of a disaster, in time to inform decisions about seed distribution, replanting schedules, food imports, and compensation payments. The authors emphasize that the framework supports post-disaster recovery planning as much as it documents damage, and they credit the BRIN disaster task force and local agricultural officers for releasing data quickly enough to make the analysis possible. As extreme weather increasingly tests the world&#8217;s rice bowls, the ability to count the losses from orbit, and to know precisely when to trust and when to correct those orbital counts, may become as vital to food security as the harvest itself.</p>
<p><strong>Subject of Research:</strong> Satellite-based rapid assessment of flood damage to paddy rice fields caused by Tropical Cyclone Senyar in Sumatra</p>
<p><strong>Article Title:</strong> Rapid identification of tropical cyclone senyar-affected paddy fields in sumatra using Sentinel-1 and official paddy field area data</p>
<p><strong>Article References:</strong> Mulyani, A., Hati, D. P., Manurung, E. D., Maswar, M., Sosiawan, H., Gani, R. A., Awaludin, A., Karolinoerita, V., Widodo, J., Vetrita, Y., Budhiman, S., Nugroho, U. C., Munawaroh, M., Zylshal, Z., Denaro, L. G., Ardha, M., Ibrahim, A., Sukarno, K. M., Handika, R., &#8230; Cahyana, D. (2026). Rapid identification of tropical cyclone senyar-affected paddy fields in sumatra using Sentinel-1 and official paddy field area data. <em>Theoretical and Applied Climatology, 157</em>(10), Article 615. <a href="https://doi.org/10.1007/s00704-026-06455-w" rel="noopener noreferrer">https://doi.org/10.1007/s00704-026-06455-w</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> <a href="https://doi.org/10.1007/s00704-026-06455-w" rel="noopener noreferrer">10.1007/s00704-026-06455-w</a></p>
<p><strong>Keywords:</strong> Tropical Cyclone Senyar, Sumatra, Sentinel-1, synthetic aperture radar, flood mapping, paddy fields, rice production loss, UNOSAT, Indonesia, food security, disaster assessment, near-equatorial cyclone</p>
]]></content:encoded>
					
		
		
		<post-id xmlns="com-wordpress:feed-additions:1">250441</post-id>	</item>
		<item>
		<title>Satellites and Gravity Data Reveal Hidden Faults Beneath Indonesia&#8217;s Lokop Geothermal Prospect</title>
		<link>https://scienmag.com/satellites-and-gravity-data-reveal-hidden-faults-beneath-indonesias-lokop-geothermal-prospect/</link>
		
		<dc:creator><![CDATA[Violet Maxwell]]></dc:creator>
		<pubDate>Sat, 26 Sep 2026 22:10:46 +0000</pubDate>
				<category><![CDATA[Earth Science]]></category>
		<category><![CDATA[Bouguer anomaly]]></category>
		<category><![CDATA[Earth science informatics in fault detection]]></category>
		<category><![CDATA[fault mapping]]></category>
		<category><![CDATA[Fault network detection using remote sensing]]></category>
		<category><![CDATA[geothermal energy]]></category>
		<category><![CDATA[Geothermal resource assessment without drilling]]></category>
		<category><![CDATA[gravity survey]]></category>
		<category><![CDATA[Great Sumatran Fault]]></category>
		<category><![CDATA[Hidden fault mapping beneath Sumatra]]></category>
		<category><![CDATA[hydrothermal alteration]]></category>
		<category><![CDATA[Hydrothermal fluid pathways in geothermal systems]]></category>
		<category><![CDATA[Indonesia]]></category>
		<category><![CDATA[Indonesia geothermal energy exploration]]></category>
		<category><![CDATA[kaolinite]]></category>
		<category><![CDATA[Landsat]]></category>
		<category><![CDATA[Landsat imagery analysis]]></category>
		<category><![CDATA[Lokop]]></category>
		<category><![CDATA[Low-density zones and mineral indicators in geothermal fields]]></category>
		<category><![CDATA[Plate tectonics influence on geothermal zones]]></category>
		<category><![CDATA[remote sensing]]></category>
		<category><![CDATA[Remote sensing techniques for subsurface fault identification]]></category>
		<category><![CDATA[satellite gravity data]]></category>
		<category><![CDATA[Sumatra]]></category>
		<category><![CDATA[Tectonic activity and geothermal prospects]]></category>
		<guid isPermaLink="false">https://scienmag.com/?p=216637</guid>

					<description><![CDATA[By combining ground gravity measurements with Landsat satellite imagery, Indonesian researchers have mapped the fault networks, fluid-filled low-density zones, and hydrothermal alteration minerals of the Lokop geothermal prospect in Aceh, Sumatra.]]></description>
										<content:encoded><![CDATA[<p>Deep beneath the rolling terrain of Aceh Province in northern Sumatra, hot water is circulating through a labyrinth of fractures that scientists have now mapped in unprecedented detail without ever drilling a single well. A research team led by Faisal Abdullah of Universitas Syiah Kuala has combined satellite gravity measurements with Landsat imagery to chart the hidden plumbing of the Lokop geothermal prospect, revealing low-density zones saturated with hydrothermal fluids, a network of faults that channel hot water toward the surface, and clays and iron oxides that betray the passage of scalding fluids through the rock. The study, published in Earth Science Informatics, arrives at a moment when Indonesia is aggressively pursuing geothermal energy as a cornerstone of its renewable energy strategy, and it demonstrates how two of the cheapest exploration tools available can converge on the same underground target from completely different directions.</p>
<p>The appeal of Lokop is easy to understand. The prospect sits on Sumatra, an island stitched together by the Great Sumatran Fault, the massive strike-slip structure that accommodates the oblique collision between the Indo-Australian and Eurasian plates. That tectonic violence fractures the crust and provides the pathways that deep, hot fluids need to rise. Lokop is also readily accessible and surrounded by a substantial population and growing business districts, meaning that any power plant built there would have customers close at hand. The Indonesian government has pledged strong commitment to green and renewable energy initiatives, with geothermal among its priorities, yet the geological framework and geophysical properties of the Lokop prospect remained poorly constrained, and published scientific studies on the area were markedly limited. The new research set out to close that gap with two explicit goals: mapping the hydrothermal alteration zones at the surface and tracing the fault zones that feed them from below.</p>
<p>The first line of attack came from gravity. Gravity surveying is one of the oldest tools in geophysics, but it remains remarkably powerful for geothermal work because the physical property it measures, rock density, changes systematically as fluids and alteration destroy the original fabric of a volcanic terrain. The team conducted field gravity measurements using a CG-5 Autograv gravimeter, an instrument sensitive enough to detect variations in gravitational acceleration of a few hundredths of a milligal, and then processed the data through a suite of mathematical filters designed to sharpen the edges of buried density contrasts. Techniques such as horizontal gradient and enhanced derivative analysis amplify the signatures of steep contacts, which in a geothermal setting usually correspond to faults and fracture systems. The result was a structural map of the subsurface that no surface mapping alone could produce.</p>
<p>The gravity analysis delivered a clear verdict. Across the Lokop field, the Bouguer anomaly, the corrected measure of gravitational attraction that strips away the effects of elevation and surrounding topography, drops to values between -20 and -15 milligal. In geophysical terms, such pronounced gravity lows are the fingerprint of rocks that have been rendered porous and permeable, their density reduced by open fractures and, crucially, by the hydrothermal fluids filling them. Dense, intact volcanic rock pulls slightly harder on a gravimeter than fractured, water-saturated rock does, and the difference, though tiny, is measurable and mappable. The spatial distribution of these low-density zones allowed the researchers to delineate the faults and fracture systems across the Lokop field, effectively drawing the skeleton of the geothermal reservoir in three dimensions and identifying the conduits along which hot fluids ascend.</p>
<p>While gravity probed downward, the second half of the study looked up, or rather out, from more than 700 kilometers away. Landsat satellites have been photographing Earth continuously since the 1970s, and their multispectral sensors record reflected sunlight in narrow wavelength bands that go far beyond what the human eye can distinguish. Hydrothermally altered minerals have diagnostic spectral signatures: iron oxides absorb strongly in the blue and green portions of the spectrum, producing characteristic red-stained outcrops, while clay minerals such as kaolinite and the greenish mica chlorite absorb in the shortwave infrared. By computing band ratios and spectral indices that contrast these absorption features, the team converted ordinary satellite imagery into mineral maps, flagging pixels where the surface rocks had been chemically transformed by circulating hot fluids.</p>
<p>The remote sensing results dovetailed neatly with the geophysics. The altered minerals identified across the prospect were primarily iron oxides, kaolinite, and chlorite, a classic assemblage for the outer, cooler margins of a geothermal system where descending meteoric water reacts with volcanic rock at moderate temperatures. Significantly, these alteration minerals were concentrated mainly in the hot spring areas, exactly where one would expect fluid upflow zones to be. The coincidence of surface alteration, thermal springs, and subsurface gravity lows paints a coherent picture of a working geothermal system: faults acting as highways for fluid ascent, porous fractured reservoir rock at depth, and a halo of altered minerals marking where the fluids have leaked toward the surface over geologic time.</p>
<p>The team added a temporal dimension by analyzing time series of land surface temperature derived from the thermal infrared bands of Landsat. Rather than relying on a single snapshot, which can be distorted by weather, season, or solar heating, the multi-year record isolates the persistent thermal component of the Lokop hot spring. The springs registered temperatures ranging from 36 to 38.5 degrees Celsius, with the lowest value recorded in 2023 and the highest in 2020. That the maximum predates the minimum is more than a curiosity: the researchers interpret the warmer 2020 peak as evidence of an increased heat supply from the geothermal reservoir, a reminder that these systems are dynamic and that their surface expressions can vary on timescales of just a few years. For exploration geologists, such thermal variability is a clue about how vigorously the reservoir is being recharged and heated from below.</p>
<p>What makes the study methodologically interesting is its economy. Traditional geothermal exploration escalates quickly in cost, from geological mapping through gravity and magnetic surveys to magnetotellurics, seismic reflection, and finally slim-hole drilling, which can run into millions of dollars per well. By integrating freely available Landsat data with a modest ground gravity campaign, the Lokop team extracted a structural framework and an alteration map for a fraction of the usual expense, and they did so in a region where prior published data were scarce. The approach follows a well-established logic in geothermal exploration worldwide, from the East African Rift to Turkey and the Philippines, where the combination of potential field geophysics and optical remote sensing routinely serves as the screening tool that decides where expensive instruments and drills should be pointed next.</p>
<p>The regional tectonic context strengthens the case that Lokop is worth that attention. Sumatra&#8217;s geothermal resources are fundamentally a byproduct of the Great Sumatran Fault system, whose segmentation controls where volcanic centers and hot springs emerge along the 1,900-kilometer structure. Previous studies by some of the same Universitas Syiah Kuala researchers have used gravity data to trace the fault&#8217;s continuity, including its offshore extensions, and to map shallow fracture systems around volcanic prospects such as Jaboi and Seulawah. The Lokop work extends that playbook to a previously understudied field, showing that the same density contrasts and fault-controlled permeability that characterize Sumatra&#8217;s better-known geothermal systems are present here as well.</p>
<p>For Indonesia, the implications are practical. The country sits along one of the most volcanically active arcs on Earth and holds some of the world&#8217;s largest estimated geothermal reserves, yet only a fraction of that capacity has been developed. Prospects like Lokop, which are accessible, close to demand, and now supported by a first-pass scientific characterization, are natural candidates for the next stage of exploration, which would likely involve magnetotelluric soundings to image the conductive clay cap at depth, geochemical sampling of the springs, and eventually temperature gradient wells. The authors present their results as essential insights for enhanced characterization of the Lokop geothermal system, and in doing so they offer a template for how satellite data and a gravimeter in a backpack can turn a blank spot on the exploration map into a well-defined drilling target, all before a single rig arrives on site.</p>
<p><strong>Subject of Research:</strong> Integrated gravity and Landsat remote sensing analysis for mapping hydrothermal alteration and fault zones in the Lokop geothermal prospect, Sumatra, Indonesia</p>
<p><strong>Article Title:</strong> Integrated gravity and landsat analyses for hydrothermal alteration and fault zone mapping in the lokop geothermal prospect, Indonesia</p>
<p><strong>Article References:</strong> Abdullah, F., Yanis, M., Adhari, M. R., Darisma, D., Nugraha, G. S., Zainal, M., &amp; Ismail, N. (2026). Integrated gravity and landsat analyses for hydrothermal alteration and fault zone mapping in the lokop geothermal prospect, Indonesia. <em>Earth Science Informatics, 19</em>(10), Article 178. <a href="https://doi.org/10.1007/s12145-026-02229-0" rel="noopener noreferrer">https://doi.org/10.1007/s12145-026-02229-0</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> <a href="https://doi.org/10.1007/s12145-026-02229-0" rel="noopener noreferrer">10.1007/s12145-026-02229-0</a></p>
<p><strong>Keywords:</strong> geothermal energy, Lokop, Sumatra, gravity survey, Landsat, hydrothermal alteration, fault mapping, Bouguer anomaly, remote sensing, kaolinite, Great Sumatran Fault, Indonesia</p>
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		<post-id xmlns="com-wordpress:feed-additions:1">216637</post-id>	</item>
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		<title>Watch, then try: how orangutan learning styles decide who survives alone</title>
		<link>https://scienmag.com/watch-then-try-how-orangutan-learning-styles-decide-who-survives-alone/</link>
		
		<dc:creator><![CDATA[Courtney Benton]]></dc:creator>
		<pubDate>Thu, 24 Sep 2026 23:08:21 +0000</pubDate>
				<category><![CDATA[Social Science]]></category>
		<category><![CDATA[animal cognition and survival]]></category>
		<category><![CDATA[animal culture]]></category>
		<category><![CDATA[animal learning and behavior]]></category>
		<category><![CDATA[childhood development]]></category>
		<category><![CDATA[diet breadth]]></category>
		<category><![CDATA[early life learning in primates]]></category>
		<category><![CDATA[ecological competence]]></category>
		<category><![CDATA[field study]]></category>
		<category><![CDATA[great apes]]></category>
		<category><![CDATA[individual learning]]></category>
		<category><![CDATA[Max Planck Institute]]></category>
		<category><![CDATA[orangutan foraging techniques]]></category>
		<category><![CDATA[orangutan independence transition]]></category>
		<category><![CDATA[orangutan juvenile development]]></category>
		<category><![CDATA[orangutan learning styles]]></category>
		<category><![CDATA[orangutan survival skills]]></category>
		<category><![CDATA[orangutans]]></category>
		<category><![CDATA[primate ecological skill development]]></category>
		<category><![CDATA[rainforest animal behavior]]></category>
		<category><![CDATA[Science journal]]></category>
		<category><![CDATA[social learning]]></category>
		<category><![CDATA[social vs individual learning in animals]]></category>
		<category><![CDATA[Sumatra]]></category>
		<category><![CDATA[wild great ape adaptation]]></category>
		<guid isPermaLink="false">https://scienmag.com/?p=212939</guid>

					<description><![CDATA[A long-term study of wild Sumatran orangutans shows that each infant's blend of social and individual learning predicts how broad its diet will be when it finally leaves its mother.]]></description>
										<content:encoded><![CDATA[<p>In the tangled rainforests of Sumatra, a young orangutan faces one of the longest apprenticeships in the animal kingdom. For roughly eight and a half years, an infant clings to its mother, watching everything she eats, everything she avoids, and every careful technique she uses to pry nutrition out of a forest that is full of traps. Then, almost overnight, the safety net disappears. Orangutans leave their mothers and must fend for themselves entirely alone, choosing from thousands of potential food items in a habitat where the wrong choice can be toxic or even lethal. A new study published in Science shows that how well a young orangutan navigates this transition depends on something remarkably personal: its own individual learning style.</p>
<p>The research, led by Dr. Revathe Thillaikumar, a Marie Sklodowska-Curie Actions Postdoctoral Fellow at the Max Planck Institute of Animal Behavior, together with senior author Dr. Caroline Schuppli and colleagues at Universitas Nasional in Indonesia, is the first to demonstrate that social and individual forms of learning interact over many years to build broad, survival-relevant ecological skills in a wild great ape. Until now, scientists have debated to what extent animals acquire their survival skills by watching others or by experimenting on their own, but the long developmental timelines of great apes have made it extraordinarily difficult to connect learning events to concrete outcomes. This study closes that gap with an unusually detailed dataset and a statistical approach that treats each animal as its own developmental story.</p>
<p>The scale of the challenge facing a young orangutan is hard to overstate. An adult orangutan&#8217;s diet consists of nearly 250 distinct food items, selected from thousands of different options scattered across the rainforest maze. Some of those options are potentially poisonous. Beyond simply knowing what to eat, an independent orangutan must master how each food should be processed, and when and where each item can be found in the forest. As Thillaikumar asks, how do infants master this complex diet curriculum during their first years of life? Humans offer a clue, because throughout our evolutionary history we too had to learn an immense set of survival skills across many years of development, drawing on a complex interplay of social and individual learning. But whether wild animals use the same combination of learning forms to build their own survival skills had remained unknown.</p>
<p>To answer the question, the team drew on long-term data from the Suaq Balimbing research station in Gunung Leuser National Park, Indonesia, where an international team of researchers and field assistants follows wild Sumatran orangutans across their entire lives. For this study, the researchers analyzed data from 21 immature orangutans recorded from birth until independence at around 8.5 years of age. Across 4,700 hours of observation, they tracked three key behaviors: when the youngsters closely observed their mothers and other nearby orangutans through a behavior known as peering, which serves as a behavioral indicator of social learning; when they explored different items in their habitat, indicating individual learning; and which food items they successfully ate without help from their mothers, a direct measure of ecological competence.</p>
<p>The analytical challenge was formidable. Because orangutans develop so slowly, there is a multi-year lag between a learning event and any measurable change in behavior, as Schuppli explains. To bridge that gap, Thillaikumar worked with theoretical statistician Professor Paul-Christian Bürkner of TU Dortmund University to analyze just under seven thousand records of social and individual learning, keeping each animal&#8217;s history separate. This individual-level modeling was, in her words, a linchpin of the study, because it finally allowed the researchers to link the two parts that had previously been unbridgeable: learning and skill development. Rather than averaging across the population, the team could trace how each animal&#8217;s own learning tendencies shaped its own eventual diet.</p>
<p>The first major finding is that orangutan infants have genuinely individual learning styles. Over their long development, the immatures differed substantially from one another in how frequently they engaged in social versus individual learning. Thillaikumar admits the team was astonished by how different the infants were from one another in their tendencies to learn. Yet despite this variation, a clear pattern emerged across the group: all immatures engaged in social learning more frequently than individual learning, on average as much as five times more often. The explanation, Schuppli suggests, lies in the economics of risk. Learning purely through individual exploration can be dangerous for a naive orangutan, especially for immatures who are still growing and cannot afford to miss out on feeding opportunities. The safer option may simply be to watch and learn from knowledgeable role models, such as their mothers.</p>
<p>Social learning, it turns out, does far more than provide a safe alternative to exploration. When an infant engaged in social learning, it triggered subsequent exploration for as long as two and a half hours afterward. Each time an infant peered at its mother or another orangutan, it produced a prolonged ripple effect on its own subsequent explorations, priming the youngster to investigate items it had just seen handled by someone else. To disentangle the contributions of the two processes, the authors focused on explorations that were independently initiated, allowing them to test how social and individual learning worked together rather than merely replacing one another.</p>
<p>The answer is that the two forms of learning operate in tandem across the entire developmental period. Infants that engaged in high rates of both social and individual learning ended up with the broadest diet profiles by the time they became independent. Conversely, when both forms of learning were low, individuals ended up with the narrowest diets, producing a striking three-fold difference in diet breadth between the highest and lowest learners. Perhaps most intriguingly, increased social learning could partially compensate for low individual learning, improving diet breadth even when independent exploration was infrequent. As Thillaikumar puts it, social learning stepped in to do the heavy lifting, a result that underlines just how significant it is in the lives of great apes.</p>
<p>For Schuppli, the findings demand a more nuanced appreciation of the mechanisms underlying great ape cultures. It is about more than just social or individual learning, she says; it is about the interplay of complex learning mechanisms that has driven the development of a broad, highly survival-relevant cultural competence in one of our closest living relatives in the wild. That interplay, she argues, suggests that the sophisticated cultural learning seen in humans may have deep evolutionary roots, predating the split between our lineages by many millions of years. In other words, the recipe for human culture, a blend of attentive observation and hands-on experimentation sustained over a long childhood, may already have been simmering in the forests where our ape relatives live today.</p>
<p>Questions remain. The study shows that heightened learning produces broader diets, but exactly how this advantage arises is still open. Are high-learning orangutans simply accumulating knowledge about more items, or are they actually getting better at learning itself? The team now plans to look beyond diet breadth to determine whether greater learning also improves energy intake, and ultimately whether it translates into measurable differences in survival and reproduction. As co-author Dr. Sri Suci Utami-Atmoko of Universitas Nasional notes, questions like these can only be answered by watching animals in their natural environment from birth to death, because long-term field studies provide the time and space to follow long-lived animals across their whole histories. For orangutans, she says, these studies offer a window into how culture and survival have become intertwined over evolutionary time. For the rest of us, they offer a humbling reminder that the path to competence, in the rainforest as in our own species, is neither purely taught nor purely discovered, but built patiently from both.</p>
<p><strong>Subject of Research:</strong> How social and individual learning styles shape ecological skill development in wild orangutans</p>
<p><strong>Article Title:</strong> Learning style predicts survival skills in young orangutans</p>
<p><strong>Article References:</strong> Learning style predicts survival skills in young orangutans. (n.d.). <a href="https://www.eurekalert.org/news-releases/1144685" rel="noopener noreferrer">Original publication</a></p>
<p><strong>Image Credits:</strong> AI Generated</p>
<p><strong>DOI:</strong> Not provided</p>
<p><strong>Keywords:</strong> orangutans, social learning, individual learning, animal culture, Sumatra, diet breadth, great apes, childhood development, ecological competence, field study, Science journal, Max Planck Institute</p>
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