Tuesday, September 23, 2025

Reviving The Serengeti: How Maasai Women’s Dairy Initiatives Protect Wildlife And Communities – OpEd


September 23, 2025

By David Blanton


Facing habitat loss, climate change, and shifting livelihoods, Maasai women are leading a transformative program that links sustainable dairy farming with the preservation of the Serengeti’s iconic migrations and the resilience of local communities.


The Serengeti—whose name means “endless plains” in the Maasai language—is one of the most renowned natural landscapes in the world. Spanning northern Tanzania and extending into southwestern Kenya, this vast ecosystem is home to the largest land animal migration on Earth. Every year, a million or more wildebeest, zebras, and gazelles undertake an epic journey across these grasslands, following the seasonal rains in search of fresh pasture and water. This migration supports a diverse food web that includes predators such as lions, cheetahs, and hyenas, making the Serengeti a critical hotspot of biodiversity. UNESCO recognizes the Serengeti as one of the planet’s most impressive natural wonders, celebrating its rich ecological complexity and the spectacle of the migration.

Yet the Serengeti’s “endless plains” are no longer endless. Over the past several decades, human activities have profoundly altered the landscape. Scientific research spanning 40 years and involving teams from seven countries reveals significant habitat fragmentation due to human development and expansion. This fragmentation has disrupted migration corridors and limited the free movement of wildlife across the ecosystem.

“The activities of people have caused extreme changes to the habitat,” writesJoseph Ogutu, a statistician at the University of Hohenheim, in the Conversation. “It has significantly reduced the amount of grass and, because of farms, settlements, and fences, the landscape has become fragmented. This means animals can’t move freely to find resources or mate.” In Kenya’s Maasai Mara Reserve—the northern section of this ecosystem—wildlife populations have dropped by almost 70 percent since the late 20th century. Wildebeest migration routes to the Mara have diminished by over 70 percent, underscoring the severity of the ecological changes.

The pressures driving these changes are multifaceted and intertwined. The human population surrounding the Serengeti is growing rapidly, and Tanzania is among the countries with the highest population growth rates globally. This demographic expansion places tremendous demand on land and natural resources. Agricultural development and livestock grazing expand to meet the needs of this growing population, converting wildlands into farms and grazing plots. These land use changes, coupled with fences and settlements, disrupt traditional animal movements and reduce the availability of quality forage.

Climate change compounds these challenges. Rainfall patterns are becoming more erratic, with more prolonged and more intense droughts alternating with severe flooding events. These extremes threaten both wildlife and human livelihoods. Water sources are drying up more frequently, forcing pastoralists and wildlife alike to travel further for access to water and food. The result is increased competition and tension between people, livestock, and wildlife, as well as mounting risks to soil health and ecosystem function.


For the Maasai people, who have lived in harmony with wildlife around the Serengeti for centuries, these environmental shifts bring urgent challenges. Traditionally semi-nomadic pastoralists, Maasai communities relied on seasonal cattle movement and access to communal grazing lands to sustain their herds and their way of life. Cattle are more than livestock; they represent wealth, social status, and cultural identity. However, increasing land pressure means that less space is available for grazing, and many Maasai families are turning to farming as a supplementary or alternative livelihood. This shift represents a fundamental change in Maasai society and its deep connection to pastoralism.

At the same time, when herd sizes are enlarged to compensate for shrinking grazing areas, land degradation is exacerbated, leading to a vicious cycle of overgrazing, soil erosion, and a lower quality of forage. Women, who traditionally manage milking and child care, often have limited say in household decisions, restricting the potential for broader social and economic change. Early marriage and limited educational opportunities further challenge the empowerment of Maasai women and youth.

A Community-Led Vision for Sustainable Change

Recognizing these complex challenges, Maasai educator and conservationist Meyasi Meshilieck initiated the Maasai Women’s Dairy Program to foster a sustainable and locally driven solution. The program’s philosophy centers on balancing human welfare with the conservation of biodiversity—that is, improving livestock productivity while also reducing environmental impacts.

The core strategy of the program is to encourage Maasai families to keep smaller herds composed of improved breeds of dairy cattle that produce significantly more milk than traditional local breeds. Larger herds have long been equated with wealth and status among the Maasai, but the ecological and economic realities are shifting. Smaller, high-producing herds can generate more income and nutrition with less pressure on the land.

The implementation of this strategy requires a comprehensive approach. The program incorporates training for Maasai women in improved dairy husbandry, the production of forage, and cooperative management. Women’s involvement is essential because their control over income and resources can transform household decision-making, improve child nutrition, and promote education—especially for girls. By empowering women to manage small-scale dairy enterprises, the program also addresses the gender disparities deeply embedded in traditional social structures.

Moreover, the program emphasizes sustainable land-management practices, such as cultivating drought-tolerant forage grasses and using manure to regenerate soils. This integrated approach fosters resilience to variations in climate by improving soil health, reducing erosion, and maintaining pasture productivity even during dry spells. It also seeks to reduce conflicts over land use by promoting more efficient livestock management and minimizing encroachment on protected wildlife areas.

From Pilot Success to Broader Impact

The program began with an experiment at Saravu Farm, located near Arusha in northern Tanzania. In 2018, Meshilieck sold his family’s own indigenous cows and replaced them with an improved breed. It was a big step. He worked through challenges such as securing consistent supplies of forage and water, managing animal health, and developing marketing strategies for milk products. This initial pilot stage, based on trial and error, became the template for the training program.

A critical component of the program’s success has been ensuring the health and well-being of the dairy cows. These hybrid breeds require careful management, including access to clean water, high-quality forage, and attentive husbandry. Recognizing this, the program provides comprehensive training on the care and feeding of animals as well as the prevention of disease. Veterinary services and support are integrated to address health challenges promptly, thus helping to maintain the cows’ productivity and longevity. Although these cows demand more care than traditional breeds, the program’s emphasis on proper management ensures that the benefits of higher milk production will be sustainable for families and the environment alike.

Among the many challenges faced by the pilot phase were securing reliable water and forage during droughts, managing animal health, and establishing markets for milk products. Through collaboration with local communities and adaptation to environmental constraints, these challenges were gradually overcome. Techniques such as rainwater harvesting and the introduction of drought-resistant forage species helped to ensure the availability of feed and water. Cooperative marketing and the processing of milk extended its shelf life and increased income for farmers.

Initial training has begun to pay off and holds great promise. Participating women are getting increased earnings from milk sales, which will eventually allow them to invest in household improvements and education. Herd sizes per family should eventually substantially increase, while both income and milk production increase—a win-win scenario for families and the environment. Encouraged by these results, Saravu Farm transitioned into a training center, providing hands-on workshops for Maasai women from across the region.

Building on the pilot’s foundation, the program is now scaling up. Training has expanded to additional villages, where women are taught about animal husbandry, the cultivation of forage, and cooperative governance. New groups of women receive improved dairy cattle and access to microloans, enabling them to start their own dairy enterprises.

The program’s design incorporates continuous monitoring and adaptation, recognizing the need to balance technical feasibility with cultural acceptance. It strives to foster community ownership and collaboration among local leaders, pastoralists, conservationists, and government agencies. The aim is to create a replicable model that can be adapted and expanded throughout Tanzania and other regions facing similar pressures on pastoralist lands adjacent to protected areas.

Maasai culture is resilient and often resistant to change, so the program employs a variety of techniques to introduce new ideas and build acceptance. It begins by consulting with elders to secure their support, while also focusing on women as key change agents. Cultural elements such as song and dance are used to convey messages in ways that resonate deeply within the community, and support from local influencers helps reinforce these efforts. To broaden outreach, the program also leverages radio and social media to spread information and shape attitudes. Finally, women who have already been trained serve as mentors for new groups, creating a cycle of guidance and empowerment.

Linking Human Well-being to the Success of Conservation

Threats to the Serengeti habitat and wildlife, and the challenges facing Maasai communities, are deeply interconnected. Conservation efforts cannot succeed without simultaneously addressing the social and economic needs of the people living alongside the park. Poverty, food insecurity, and the lack of alternatives often drive unsustainable land use practices, whereas community well-being enhances the prospects for effective stewardship.

The reduction of herd sizes through improved dairy management directly alleviates overgrazing and soil degradation, thus helping to restore critical wildlife habitats. The restoration of these habitats supports the migratory species that define the Serengeti’s ecosystem, preserving the ecological processes essential to its resilience. Additionally, increased income from milk sales allows families to diversify their diets, invest in health and education, and reduce pressures to convert more wildlands into farmland.

Empowering women is a crucial multiplier in this equation. When women control resources, evidence shows that child nutrition improves, educational attainment rises, and harmful practices such as early marriage decline. These social shifts contribute to more sustainable rates of population growth and greater social stability.

The Maasai Women’s Dairy Program exemplifies how integrating social development and environmental conservation can create synergistic benefits. Rather than pitting people against wildlife, it fosters a shared future where pastoralists and the ecosystems that support them can both thrive, even amid rapid environmental change. This community-driven model offers valuable lessons for similar regions throughout the world that are facing pressures from population growth, climate change, and habitat loss—showing that sustainable livelihoods and conservation can go hand in hand to protect people, animals, and the planet


Author Bio: David Blanton is the founder and executive director of Serengeti Watch, a nonprofit conservation association that works with local communities and travel companies to advance conservation, human welfare, and sustainable tourism.
Source: This article was produced by Earth | Food | Life, a project of the Independent Media Institute.

 

Short-term gains, long-term pains: Study reveals stock performance of SMEs after hybrid securities issuance in KOSDAQ market




Shanghai Jiao Tong University Journal Center





Background and Motivation

Hybrid securities, such as bonds with warrants, convertible bonds, and exchangeable bonds, are popular financing tools for SMEs seeking flexible capital in growing markets. While existing research has largely focused on developed markets, the performance and implications of these instruments—particularly exchangeable bonds—in emerging economies like South Korea remain underexplored. This study aims to address this gap by investigating how hybrid securities issuance influences short- and long-term stock performance in the KOSDAQ, a market dominated by innovative but often vulnerable SMEs.

 

Methodology and Scope

The study analysed a sample of 204 issuers in the KOSDAQ market from 2016 to 2020. Using event study methodology, the researchers assessed short-term cumulative abnormal returns around the announcement date of hybrid securities issuance. For long-term performance, buy-and-hold abnormal returns were calculated over two- and three-year periods post-issuance. The analysis distinctly categorised hybrid securities into bonds with warrants, convertible bonds, and exchangeable bonds to evaluate their individual and comparative impacts on stock performance.

 

Key Findings and Contributions

The study uncovered a notable divergence in stock performance. In the short run, firms experienced significantly positive cumulative abnormal returns, indicating strong investor confidence following hybrid securities announcements. However, long-term analysis revealed substantial underperformance, with stocks declining significantly over two- and three-year horizons. This trend was especially pronounced for firms issuing bonds with warrants and exchangeable bonds. The findings suggest that managers may capitalise on overvaluations in hybrid securities markets, resulting in long-term stock underperformance. Additionally, firm-specific characteristics such as growth opportunities, financial investor involvement, and corporate governance were found to play a critical role in influencing performance outcomes. As the first study to incorporate exchangeable bonds in the context of an emerging market, this research provides a nuanced perspective on hybrid securities and their long-term implications.

 

Why It Matters

The findings highlight critical risks and opportunities associated with hybrid securities in emerging markets. For investors, the study underscores the importance of looking beyond short-term market reactions and evaluating long-term trajectories and firm-specific factors. For policymakers, these insights can inform regulatory approaches to hybrid securities markets, ensuring greater transparency and sustainability in SME financing. The study also contributes to global financial literature by shifting the focus from developed to emerging economies, offering a comparative foundation for understanding market-specific dynamics.

 

Practical Applications

  • Investors can use these findings to refine their investment strategies, accounting for both short-term gains and long-term risks associated with hybrid securities.
  • SMEs seeking financing can better understand the potential long-term implications of hybrid securities issuance on their stock performance and market perception.  
  • Policymakers and Financial Regulators may leverage these insights to develop guidelines that promote sustainable financing practices and protect investor interests in emerging markets.  
  • Academic Researchers can build upon this study to explore hybrid securities in other emerging economies or to investigate the role of corporate governance in mitigating long-term underperformance.

 

Discover high-quality academic insights in finance from this article published in China Finance Review International. Click the DOI below to read the full-text original!

 

Spain must significantly reduce nitrogen oxide emissions from road traffic and control industrial emissions to lower tropospheric ozone levels before 2030



The report "Bases científicas para un Plan Nacional de Ozono" [Scientific Bases for a National Ozone Plan] is available on the website of the Ministry for the Ecological Transition and the Demographic Challenge




Universitat Jaume I

Spain must significantly reduce nitrogen oxide emissions from road traffic and control industrial emissions to lower tropospheric ozone levels before 2030 

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The conclusions of the report "Bases científicas para un Plan Nacional de Ozono" [Scientific Bases for a National Ozone Plan], published by the Sub-Directorate General for Pollution Prevention of the Ministry for the Ecological Transition and the Demographic Challenge, indicate that it is essential, before 2030, to achieve objectives such as a 60% reduction in nitrogen oxide (NOx) emissions from road traffic compared to 2019; a 20% decrease in the same emissions from maritime transport; and the frequent monitoring of industrial facilities that account for a high percentage of total ozone precursor emissions.

Tropospheric ozone is found in the lower layers of the atmosphere and can have harmful effects on both human health and ecosystems, especially forests and agricultural yields. It is a secondary pollutant generated through photochemical reactions (in the presence of sunlight) from other primary pollutants, known as “precursors”, which are mainly nitrogen oxides and volatile organic compounds (VOCs). Its main sources include road, maritime, and air traffic, as well as industrial activities.

In the preliminary study that served as the basis for the report, the scientific staff who prepared it stressed that during the period prior to the pandemic there was systematic non-compliance across almost all Spanish regions with the guideline values of the World Health Organisation and the standards of the 2008 European Directive, an issue made even more critical by the publication in 2024 of a new directive with stricter targets. The decline in levels during the pandemic suggests that there is room for action to improve ozone levels in Spain.

The multidisciplinary group in charge of drafting the report consisted of around forty scientists, coordinated by Xavier Querol of the Institute of Environmental Assessment and Water Research (IDAEA-CSIC), and included contributions from research teams at the Universitat Jaume I of Castelló, the Barcelona Supercomputing Center (BSC), the Mediterranean Center for Environmental Studies (CEAM), the University of the Basque Country (UPV/EHU), and the collaboration of the universities of Zaragoza, Huelva and Aveiro (Portugal).

At the UJI, the Environmental and Energy Engineering Applied to Industrial Processes Group (GAIA) of the Agustín Escardino Institute of Ceramic Technology, led by Eliseo Monfort, contributed to campaigns measuring volatile organic compounds (VOCs) and to the analysis of inventories and corrective measures regarding industrial emissions in areas with high ozone concentrations. To ensure that the information collected was realistic, 50 of the 80 largest industrial companies emitting ozone precursors, across eleven industrial sectors located in Madrid, Catalonia, Andalusia, and the Valencian Community, were visited.

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Credit: Universitat Jaume I of Castellón





The conclusions of the report "Bases científicas para un Plan Nacional de Ozono" [Scientific Bases for a National Ozone Plan], published by the Sub-Directorate General for Pollution Prevention of the Ministry for the Ecological Transition and the Demographic Challenge, indicate that it is essential, before 2030, to achieve objectives such as a 60% reduction in nitrogen oxide (NOx) emissions from road traffic compared to 2019; a 20% decrease in the same emissions from maritime transport; and the frequent monitoring of industrial facilities that account for a high percentage of total ozone precursor emissions.

Tropospheric ozone is found in the lower layers of the atmosphere and can have harmful effects on both human health and ecosystems, especially forests and agricultural yields. It is a secondary pollutant generated through photochemical reactions (in the presence of sunlight) from other primary pollutants, known as “precursors”, which are mainly nitrogen oxides and volatile organic compounds (VOCs). Its main sources include road, maritime, and air traffic, as well as industrial activities.

In the preliminary study that served as the basis for the report, the scientific staff who prepared it stressed that during the period prior to the pandemic there was systematic non-compliance across almost all Spanish regions with the guideline values of the World Health Organisation and the standards of the 2008 European Directive, an issue made even more critical by the publication in 2024 of a new directive with stricter targets. The decline in levels during the pandemic suggests that there is room for action to improve ozone levels in Spain.

The multidisciplinary group in charge of drafting the report consisted of around forty scientists, coordinated by Xavier Querol of the Institute of Environmental Assessment and Water Research (IDAEA-CSIC), and included contributions from research teams at the Universitat Jaume I of Castelló, the Barcelona Supercomputing Center (BSC), the Mediterranean Center for Environmental Studies (CEAM), the University of the Basque Country (UPV/EHU), and the collaboration of the universities of Zaragoza, Huelva and Aveiro (Portugal).

At the UJI, the Environmental and Energy Engineering Applied to Industrial Processes Group (GAIA) of the Agustín Escardino Institute of Ceramic Technology, led by Eliseo Monfort, contributed to campaigns measuring volatile organic compounds (VOCs) and to the analysis of inventories and corrective measures regarding industrial emissions in areas with high ozone concentrations. To ensure that the information collected was realistic, 50 of the 80 largest industrial companies emitting ozone precursors, across eleven industrial sectors located in Madrid, Catalonia, Andalusia, and the Valencian Community, were visited.

Based on ozone levels and local precursor contributions, the study identified four types of atmospheric basins in Spain:

  • R1, the lowest-level basins with mainly external contributions, including the Canary Islands, the north, and the northwest of the Iberian Peninsula.
  • R2, basins requiring moderate preventive measures due to contributions from neighboring areas, including the Balearic Islands, the Ebro Valley, and the central plateaus.
  • R3, where regulatory limits are exceeded and local generation of ozone precursors is significant, including Madrid, northern Barcelona, the Guadalquivir Valley, and the Valencian Community, where intensive precursor reduction policies are essential.
  • R4, which included Puertollano, characterized by high local production of pollutants and geographic conditions that limit dispersion, requiring the implementation of strict emission controls.

MAIN RECOMMENDATIONS

The most relevant measures should be applied as a priority in the R3 and R4 basins (Community of Madrid, Catalonia, Andalusia, Valencian Community, and Puertollano), although many may also be effective in R2 and R1. In recent years, with some variations, an overall improvement has been observed, driven by the increasing adoption of renewable energies, which have reduced precursor emissions nationwide. However, in the Madrid basin a sustained increase in ozone levels has been recorded over the last 15 years, making it advisable to investigate the causes of this trend in greater depth.

In general, the report recommends maximizing the use of ozone-precursor-free energy sources (solar, wind, hydroelectric, and nuclear) between April and September to reduce emissions during the most critical period.

Regarding road traffic, the scientific staff considers it essential to continue driving technological transition in the transport sector: fleet renewal, electrification, or reduced activity (fewer vehicles), with public administrations contributing, for example, through low-emission vehicle procurement.

For maritime traffic, the report suggests promoting the designation of the Mediterranean Sea as a Nitrogen Emission Control Area (NECA), which, in the opinion of the scientific team, could make a significant contribution to lowering ozone concentrations in Mediterranean areas.

Data on the distribution of emissions by industrial facilities indicate that a relatively small number of facilities account for a large share of ozone precursor emissions. Therefore, it is recommended to prioritize control measures in these facilities to achieve significant reductions. Furthermore, continuous monitoring of emissions should be promoted to improve management and surveillance systems, as well as predictive models, and to allow for the activation of protocols in episodes of high pollution.

Regarding volatile organic compound emissions, in addition to measures applicable to traffic and industry, the report recommends controlling certain solvents in domestic use, paints, and construction, as well as introducing appropriate protocols for biomass and agricultural residue burning, livestock waste management, and fuel supply stations.

 

Support from teachers, family and friends is crucial for students in general upper secondary education – perfectionism is associated with student burnout




University of Eastern Finland





To foster school engagement and reduce student burnout and anxiety in general upper secondary education, it is essential to understand, identify and support students with varying perfectionistic tendencies.

A recent study from the University of Eastern Finland explored different perfectionistic profiles among general upper secondary students, analysing whether support from teachers, school psychologists, family and friends moderates the association of these profiles with well-being.

The study involved 2,005 Finnish students in general upper secondary education, who were categorised into four perfectionistic profiles based on their responses to an online questionnaire: concerned (relatively low strivings and relatively high concerns, 28%), ambitious (high strivings and low concerns, 28%), perfectionists (high strivings and high concerns, 24%), and non-perfectionists (low strivings and low concerns, 20%).

These profiles were consistently associated with well-being. Ambitious students had high engagement and high strivings, and only few challenges in their well-being.

Non-perfectionists did not have high strivings, nor did they have high concerns. Their school engagement was on par with that of perfectionist students, and they also reported rather high levels of well-being.

Both of the profiles characterised by high concerns, i.e., perfectionists and concerned students, were associated with poorer well-being. It is noteworthy that more than half of the general upper secondary students fell into these two profiles.

Perfectionists reported the highest levels of burnout, depressive symptoms and anxiety, and their school engagement was lower than that of ambitious students. Concerned students experienced nearly as many challenges in their well-being as perfectionists and had the lowest school engagement.

The findings highlight that concerns about, and dissatisfaction with, one’s achievements are strongly associated with student well-being.

Well-being declines without support from family and friends

“Our study provides new insight into perfectionism, well-being and students’ perceptions of support. Most general upper secondary students felt they either did not need support or that sufficient support was available. Support from teachers, family and friends was considered important,” says Doctoral Researcher Anna Kuusi of the University of Eastern Finland, the lead author of the study.

Students who received adequate support from teachers reported almost as few symptoms of burnout, depression and anxiety as those who felt they did not need teacher support. Conversely, lacking support from teachers was associated with poorer well-being, regardless of the perfectionistic profile.

Findings relating support received from school psychologists were less conclusive. This may be due to the relatively small number of students seeking such support, or due to the possibility that those seeking support may be experiencing more severe symptoms. In addition, accessing psychological support may be challenging.

Support from family helped alleviate general upper secondary students’ symptoms of anxiety. Students who received sufficient support from their family did not differ in anxiety symptoms from those who felt they did not need family support.

Perceived support from family and friends moderated the association of perfectionistic profiles with well-being. This means that the presence or absence of support influenced how well-being manifested across different profiles. Support from friends had the strongest interaction between perfectionism and well-being. For example, perfectionists reported the poorest well-being even when they did not need support from friends, or when sufficient support was available.

Even ambitious students who otherwise reported adaptive well-being, experienced a significant decline in well-being when support from family and friends was lacking – in such cases, they suffered as many symptoms of depression and anxiety as perfectionists. In other words, even ambitious students are not immune to the effects of lacking support from family and friends.

Young people need a safe environment to pursue their goals

High strivings and high engagement do not guarantee well-being if students are at the same time afraid of making mistakes and fear failures. The study underscores the fact that high strivings alone are not enough; young people also need a safe environment where mistakes are allowed and tolerated.

Perfectionism has increased in recent decades, alongside an increase in burnout and depressive symptoms among young people. These phenomena reflect broader societal and cultural changes, such as the impact of social media on young people’s increased tendency to compare themselves to others. A better understanding of the associations between perfectionism and students’ well-being is crucial, also at the level of individuals.

Research into perfectionism among young people is particularly important because adolescence is considered a key developmental phase for the emergence of perfectionism.

The study constitutes part of the WELL2 – Making the Grade but Feeling Exhausted project funded by the Research Council of Finland. The project seeks to examine the developmental and situational dynamics between students’ motivation, perfectionism and academic well-being across upper secondary education, and to consider the role of student welfare in supporting students’ learning and well-being.

Next, the researchers will explore perfectionism and its associations with well-being in vocational education and training, an area where high-striving students have not previously been studied.

 

Bumble bees pollinated linden flowers already 24 million years ago



Fossils prove ancient pollinator-plant interaction



University of Vienna

Fig. 1: The newly discovered fossilised linden flower Tilia magnasepala. 

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Fig. 1: The newly discovered fossilised linden flower Tilia magnasepala.

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Credit: Christian Geier





An international research team led by the Department of Botany and Biodiversity Research at the University of Vienna has made an extraordinary discovery: fossilised lime blossoms and fossilised bumble bees were found in 24-million-year-old sediments at the Enspel Fossil-Lagerstätte (Rhineland-Palatinate, Germany) – along with evidence of their interaction in the form of preserved pollen grains. These findings show that bumble bees were already among the most important pollinators of linden (or lime/basswood) trees millions of years ago – just as they are today. In view of the current global decline in insect populations and of pollinators such as wild bees, it is becoming increasingly important to understand the origins and evolution of flower pollination. The results of the study are published in the journal New Phytologist.

"We examined hundreds, even thousands, of fossil flowers and insects for pollen in the hope of gaining insight into the evolution of flowers, flower visitors and pollination," explains Friðgeir Grímsson, project leader and last author from the Division of Structural and Functional Botany at the University of Vienna.

Old fossils – new methods

These microscopic pollen grains were made visible using UV and blue light and then extracted either individually or in clumps from flowers or the insects' hair using a very small, fine needle in a minimally invasive procedure. After careful cleaning of the pollen grains, they were analysed using high-resolution light and electron microscopy. The result of the pollen study: some of the flowers examined came from the linden tree, and numerous bumblebees had visited linden flowers before they drowned in a former volcanic crater lake and fossilized.

Three new species described

"The newly discovered linden flowers were named Tilia magnasepala, meaning “linden tree with large sepals", explains Christian Geier, lead author and doctoral student at the Division of Structural and Functional Botany at the University of Vienna. Two new bumble bee species were also named: Bombus (Kronobombus) messegus and Bombus (Timebombus) paleocrater. Their names refer to their old age, their morphological characteristics and the location where they were found. The fossils were found during excavations in the lake sediments of the former volcanic lake near Enspel in Rhineland-Palatinate, Germany.

Fossil flowers and their pollinators described for the first time from the same sediments

The linden flowers described are the first of their kind from the European continent to be recorded and described according to palynological criteria – i.e. the science of pollen. The fossil bumble bees are among the oldest representatives of their genus; only one species from Colorado (USA) is older. "This is the first time worldwide that a fossil flower and its pollinating bees have been described from the same sediments and directly linked to each other using pollen. This type of research has great potential to shed light on our knowledge of pollinators of the past," Geier summarises.

Learning from the past for the future

The fossil record provides insights into dynamic developments in the past: changes due to climate change, species extinction and evolutionary adaptations.

The analysis of fossil animal and plant groups allows conclusions to be drawn about their behaviour and their response to environmental changes.  "In our study, we were able to identify a certain degree of flower constancy in the bumble bees we studied. This means that they only visit one type of plant during a single flight," explains Geier. "Findings like these are important for better understanding the delicate interplay and resilience of today's ecosystems."

The study was conducted under the lead of the University of Vienna in collaboration with experts from Germany (Senckenberg Research Institute and Natural History Museum and Hessisches Landesmuseum Darmstadt) and the USA (American Museum of Natural History) and was carried out as part of the FWF project "Flower Power: can in-situ pollen link fossil plants to floral visitors? (FWF-Projekt P 34303-B)".