Mature Ecosystems Research Articles

Alignment in Mature Ecosystems: An Iterative Process Of Interorganizational Influence

Extant empirical research on ecosystem alignment has offered little insight into how mature ecosystems align their members with a new value proposition. Our longitudinal empirical study of a seven-year hub-driven alignment initiative within the SOK led retail ecosystem in Finland explores how a mature ecosystem hub attempted to enroll its members in a value-proposition updating, ecosystem-wide initiative and the members’ reaction. We find that the mature ecosystem alignment process unfolds through four distinct sets of practices: (1) Courtship, (2) Mutual Adaptation, (3) Peer Emulation, and (4) Coercion. We describe these practices and associated mechanisms and develop a process model indicating how they unfold and interrelate. Our study provides a nuanced, empirically grounded account of mature ecosystem alignment as an iterative process of multilateral interorganizational influence that leads to, on the one hand, a convergence of actions among an expanding set of ecosystem members and, on the other hand, a divergence of views between the newly aligned members and a subset of members who become increasingly entrenched in their perception of irreconcilable differences and ultimately leave the ecosystem. Our discussion suggests that the tension between the hub’s temptation to control and the ecosystem members’ concern about preserving their autonomy propels the alignment process to its conclusion. We conclude with methodological contributions, managerial implications and avenues for future research.

Fueling the Growth Engines: A Cross-Country Study on Business Accelerators’ Role in Startup Sustainability

This study examines the role of business accelerators in fostering startup performance across diverse entrepreneurial ecosystems, focusing on Romania, the United States, and Italy. Using a cross-country comparative approach, this research investigates how accelerators influence grant utilization efficiency, financial management capabilities, sustainable business practices, and income growth and diversification. The findings reveal that accelerators significantly enhance startups’ financial resource management and revenue growth, with variations across the target countries. In Romania, accelerators address structural barriers and resource constraints, while in the United States, they drive sector-specific innovations within a mature ecosystem. Italy highlights a blend of traditional and emerging industries, with accelerators fostering sustainability initiatives and innovation. This study introduces sustainable business practices and financial management capabilities as mediating factors, developing existing theoretical models. Practical implications for entrepreneurs, policymakers, and investors are outlined, emphasizing personalized business accelerator strategies to address contextual challenges.

The impacts of emotional intelligence and IOT on operational efficiency in manufacturing: A cross-cultural analysis of Nigeria and the US

This review paper explores the dual impacts of Emotional Intelligence (EI) and the Internet of Things (IoT) on Operational Efficiency (OE) in the manufacturing sectors of Nigeria and the United States, providing a comprehensive cross-cultural analysis. In an era where manufacturing industries globally are undergoing rapid technological advancements and organizational transformations, understanding the synergistic role of human and technological factors is crucial. EI, which encompasses the ability to recognize, understand, and manage emotions, significantly influences leadership effectiveness, team dynamics, and overall workplace harmony. Concurrently, the integration of IoT technologies facilitates real-time data monitoring, predictive maintenance, and enhanced automation, leading to substantial improvements in OE. The paper first delineates the conceptual frameworks of EI and IoT, highlighting their individual contributions to manufacturing efficiency. Subsequently, it discusses the comparative analysis of the manufacturing environments in Nigeria and the US, examining how cultural contexts shape the application and impact of EI and IoT. In the United States, advanced technological infrastructure and a culture of innovation foster the widespread adoption of IoT and the integration of EI in organizational practices. Conversely, Nigeria's manufacturing sector, while facing challenges such as infrastructural deficits and skill gaps, shows potential for growth through targeted investments in technology and human capital development. Through this cross-cultural lens, the paper identifies key differences in the perceptions and applications of EI, the extent of IoT integration, and the resulting OEs. The findings suggest that while the US benefits from a mature ecosystem for both EI and IoT, Nigeria's unique socio-economic landscape necessitates tailored strategies to harness these tools effectively. The analysis concludes with policy and practical implications, offering insights for enhancing manufacturing efficiency through balanced and culturally sensitive approaches to technological and EI advancements. This comprehensive review underscores the importance of synergizing human and technological capabilities to drive sustainable growth and competitiveness in the global manufacturing sector. Keywords: Emotional Intelligence, Internet of Things, Operational Efficiency, Manufacturing, Cross-Cultural Analysis, Nigeria and United States.

Assessing ecosystem health: A preliminary investigation of the gosikhurd dam ecosystem structure and functioning, an appraisal based on ecological modelling, India.

This study aims to comprehensively understand the Gosikhurd Dam ecosystem (GDE) ecosystem by employing the Ecopath with Ecosim software (version 6.6.5) to construct a trophic mass balancing model. This model consisted of 16 functional groups of organisms, and their interactions and trophic levels were explored. The study focuses on various performance indicators to assess the ecosystem's maturity and complexity. To achieve these objectives, monthly fish samples were collected from June 2022 to May 2023. Performance indicators such as the connectance index (CI), system omnivory index (SOI), Finn's cycling index (FCI), mean path length (FML), ascendency, overhead, and Shannon diversity index were calculated to assess ecosystem maturity and complexity. The Finn's cycling index (FCI) and the mean path length (FML) were calculated as 1.81 and 2.20, respectively, indicating the ecosystem's responsiveness to environmental changes and overall system health and stability. Ascendency and overhead values were also analysed, with ascendency being relatively higher (41.58%), reflecting a system that utilises less than half of its total capacity. The overhead value (58.42%) indicated that the ecosystem is relatively stable and capable of adapting to external perturbations. Furthermore, the Shannon diversity index was 1.67, illustrating less diversity and validating the ecosystem's immaturity. The study identifies critical species and their roles in shaping the ecosystem dynamics, highlighting the importance of zooplankton, zoobenthos, and tilapia as keystone species. These indices propound that GDE is in its developmental stage and lacks complexity compared to mature ecosystems. The findings provide valuable insights into the current state of the ecosystem and can guide future management and conservation efforts.

Unlocking data’s potential: navigating the challenges of data-driven innovation for start-ups

PurposeData-driven innovation is a key pillar for economic development in the 21st century, accordingly the role and value of data in developing new products, services and business models has gained attention. The study aims to identify three important factors explaining the challenges faced by young entrepreneurial firms when seeking to use public data in their business development.Design/methodology/approachThis study presents the user journeys of five data-driven start-ups in the capital region of Norway aiming to use public data in their business development process. Multiple methods for data collection were used, such as interviews, observations and secondary data.FindingsThe study reveals how differences in culture, communication and work methods across stakeholders and sectors affect and delay the process of gaining access to data. Moreover, how various forms of knowledge are expressed differently throughout the user journeys of the start-up firms, with stronger dependency on explicit and codified in early phase, and tacit and experience-based knowledge in later stages, each stage relating to the maturity of the entrepreneurial ecosystem for data-driven innovation. Therefore, the ecosystem for data-driven innovation may be further developed through arenas for collaboration that simplify the process for access to – and use of public data.Originality/valueThe study reveals how young entrepreneurial firms identify opportunities whilst simultaneously facing substantial barriers when they seek to take advantage of publicly available data and transforming them into value creating activities. The study contributes to the theoretical understanding of data-driven innovation by exploring the user journeys of start-up firms and identifying the challenges they face when utilizing public data, highlighting the importance of a mature ecosystem, collaboration for market development and the evolving role of tacit and experience-based knowledge throughout the business development process.

Primary ecological succession of marine communities on the Tajogaite lava flows (La Palma, Canary Islands), fishes colonize faster than macroinvertebrates and algae

We studied the primary succession of benthic communities in the lava flows of the Tajogaite volcano at 2, 4.5, and 7 months after the eruption ended. The lava from the Tajogaite created several lava flows and sterile rocky reefs that were monitored in both intertidal and subtidal areas up to 20 m depth. Sampling included macroinvertebrates and algae in the intertidal, and fishes, macroinvertebrates, and algae in the subtidal. A control zone was selected to compare the early colonisation of lava flows with that of a mature ecosystem. Colonisation of the lava flow was swift, with numerous species arriving and proliferating soon after the eruption ended. After 7 months, the total number of species recorded in the lava flows was 70, representing 64% of those found in the control zone. thus, communities were gradually becoming increasingly complex owing to the continuous incorporation of species. The number of fishes, and macroinvertebrates in both the intertidal and subtidal, lava flows increased progressively, approaching the values of the control zone. However, algae, in terms of total cover, presented values similar to the control zone from the beginning of the monitoring. All the communities have followed the same trajectory to converge towards communities like those in the control zone, although the rate at which they have changed with time differs. After seven months, differences in fishes between lava flows and the control zone were small, but they were still large with respect to macroinvertebrates and algae. Thus, according to each community of organisms, the benthic ecosystem of the lava flows was found at different stages of succession.

Spatial configuration of patches with different ecological maturity: Implications for service supply at the landscape level

Traditional agrarian landscapes have been managed over centuries to provide complementary ecosystem services (provision and regulation) in a sustainable manner. The spatial arrangement of patches in these landscapes seems to connect ecosystems of different maturity that complement each other functionally, through exchanges of matter and energy, optimizing provisioning services supply while minimizing management effort (e.g., water and fertilizers supply). In this study we explored the implications that the spatial pattern of patches with different degrees of maturity (grasslands, scrublands, and oak groves) may have on service provision within an agrarian multifunctional landscape. To assess the ecological maturity of the evaluated patches, we sampled biotic and abiotic variables related to compositional and structural complexity of the plant community, as well as soil characteristics. Our results show that less mature ecosystems (grasslands) adjacent to the most mature ones (oak groves) had a higher structural complexity of the plant community than those adjacent to ecosystems with intermediate maturity (scrublands), which could be associated to a higher resource flow from oak groves. Furthermore, the relative topographic position of oak groves and scrublands influenced the ecological maturity of grasslands. Grasslands topographically located below oak groves and scrublands had more herbaceous biomass and fertile soils than grasslands located above them, which suggests that resource flow is accelerated by gravitational forces. This indicates that grassland patches can have higher human exploitation rates when located below the more mature patches, which can increase agricultural provisioning services (e.g., biomass extraction). Overall, our findings suggest that agrarian provisioning services can be improved by spatially arranging the patches that provide such services (e.g., grasslands) in the landscape, as well as those patches responsible for ecosystem regulating services, such as water flow regulation and material accumulation (e.g., forests).

Analysis on Competitive Strategy of Bilibili

The Internet and technology have contributed to the development of video sites. Bilibili is currently the most significant community-based video application in China, an ACG secondary culture community and video site that has gradually become a mature ecosystem. At the same time, Bilibili is also facing intense market competition. Its competitors are mainly China’s three major traditional video platforms: Tencent, Youku, and Aiki. Currently, the main competition pattern in the domestic online video platform industry is still oligopolistic competition, seeking differentiated development, i.e., a few head enterprises compete and survive together. As the head force in the optimization and innovation of content and services, the comprehensive video market supports the overall mobile video user scale and continues to pull up. Based on this, this study analyzes the competitive market environment of Bilibili.

Factors affecting variability in fleshy cone production of Juniperus macrocarpa

Juniperus macrocarpa woodlands represent the mature ecosystem on outer sandy dunes and cliffs of the Mediterranean coasts, and typically show little or no recruitment in degraded coastal habitats. Production of fleshy cones may have strong effects on its recruitment as well as on the populations of animal species that eat the cones and disperse the seeds. In this study, I explore the inter-annual variability in cone production, its relationship with rainfall and twig growth, and the effects of silvicultural works carried out to increase the production of fleshy cones and natural regeneration of the species in Enebrales de Punta Umbría Natural Site. Silvicultural treatments had not a significant effect on the cone production, but microhabitat did. J. macrocarpa showed a variable fleshy cone production between years and synchronized fleshy cone production within years among individuals. Precipitation during the period of pollination negatively affected the production of fleshy cones which allow us to classify J. macrocarpa as a putative masting species. In clearing plants, twigs that produce many cones grew less than twigs without or with few cones, while cone production in understory plants was lower but increased with twig growth. All results seem to reinforce the fact that pollen is essential for seed cone development in J. macrocarpa, and that this is highly dependent on variation in climate (precipitation during the pollination period) and landscape features (pine plantation).

Ecosystem leadership as a dynamic capability

We analyze the role and effect of ecosystem leadership understood as the exercise of effort towards others with the purpose of establishing and maintaining an ecosystem around a focal systemic innovation. While there has been much attention to the firms that sponsor ecosystems in the ecosystem literature, ecosystem leaders are usually characterized in an atheoretical manner, and the emphasis is on, leadership in existing ecosystems, thus neglecting the role leadership might play in ecosystem emergence. We clarify and provide theoretical grounding for the important role of leadership in emerging and maturing ecosystems. Building on transaction cost economics, we conceptualize an ecosystem as a governance structure that enables and sustains coordination and cooperation among multiple economic agents towards a focal innovative value proposition. Our basic argument is that the emergence of such an ecosystems is hampered by coordination and cooperation problems which markets and the price system cannot solve by itself. Resolving these problems requires assistance, and such assistance is what we call ecosystem leadership. To further characterize the exercise of leadership we use Teece's tripartite dynamic capabilities scheme. Leadership enables ecosystem emergence through three externally-oriented dynamic capabilities: facilitating the formation of a shared vision (sensing), inducing others to make ecosystem-specific investments (seizing) and engaging in ad hoc problem solving to create and maintain stability (reconfiguring/transforming). The latter capability in particular often continues to be important in a mature ecosystem. We provide a characterization of these capabilities and argue that the ecosystem leader role in a mature ecosystem likely stems from having successfully exercised these capabilities and that their exercise also puts the leader in a prime position for value capture. We discuss implications of our arguments for ecosystem theories, for managers and for policy makers.

A novel in situ passive heating method for evaluating whole-tree responses to daytime warming in remote environments

BackgroundMany significant ecosystems, including important non-forest woody ecosystems such as the Cerrado (Brazilian savannah), are under threat from climate change, yet our understanding of how increasing temperatures will impact native vegetation remains limited. Temperature manipulation experiments are important tools for investigating such impacts, but are often constrained by access to power supply and limited to low-stature species, juvenile individuals, or heating of target organs, perhaps not fully revealing how entire or mature individuals and ecosystems will react to higher temperatures.ResultsWe present a novel, modified open top chamber design for in situ passive heating of whole individuals up to 2.5 m tall (but easily expandable) in remote field environments with strong solar irradiance. We built multiple whole-tree heating structures (WTHSs) in an area of Cerrado around native woody species Davilla elliptica and Erythroxylum suberosum to test the design and its effects on air temperature and humidity, while also studying the physiological responses of E. suberosum to short-term heating. The WTHSs raised internal air temperature by approximately 2.5 °C above ambient during the daytime. This increased to 3.4 °C between 09:00 and 17:00 local time when thermal impact was greatest, and during which time mean internal temperatures corresponded closely with maximum ambient temperatures. Heating was consistent over time and across WTHSs of variable size and shape, and they had minimal effect on humidity. E. suberosum showed no detectable response of photosynthesis or respiration to short-term experimental heating, but some indication of acclimation to natural temperature changes.ConclusionsOur WTHSs produced a consistent and reproducible level of daytime heating in line with mid-range climate predictions for the Cerrado biome by the end of the century. The whole-tree in situ passive heating design is flexible, low-cost, simple to build using commonly available materials, and minimises negative impacts associated with passive chambers. It could be employed to investigate the high temperature responses of many understudied species in a range of complex non-forest environments with sufficient solar irradiance, providing new and important insights into the possible impacts of our changing climate.

Ecosystem Carbon Stocks and Their Annual Sequestration Rate in Mature Forest Stands on the Mineral Soils of Estonia

Mature forest ecosystems are the most considerable reservoir of organic carbon (OC) among terrestrial ecosystems. The effect of soil type on aboveground OC stocks and their annual increases (AI) of overstorey tree, understorey tree and ground vegetation layers in Estonian forest phytocoenoses with mature stands on mineral soils were studied. The study enfolds nine mineral soil groups, which are characterized by their phytocoenoses composition, soil cover properties and tree stands’ taxation data. An assemblage of soil and plant cover or plant–soil system is the main focus point in explaining causal and quantitative sides of ecosystems functioning. Surface densities of OC stocks in aboveground phytomass of forests varied significantly in the range of 52–100 Mg OC ha−1. High AI or productivity (4.8–5.5 Mg OC ha−1 year−1) is a characteristic of forest ecosystems formed on leached, eluviated and pseudopodzolic soils. Forest ecosystem ground vegetation, which is an important ecological indicator, fulfils vacant ecological niches with herbs and/or mosses (up to 0.50 Mg OC ha−1). The variation of ecosystem OC stocks and their AI by soil type should be taken into account in regional OC stocks and its annual increase estimations.

Interactions of Functional Traits With Native Status and Ecosystem Novelty Explain the Establishment of Plant Species Within Urban Ecosystems: Evidence From Berlin, Germany

A key challenge in urban biodiversity conservation is to understand the drivers that govern the population establishment of different groups of species in different urban ecosystems. Here, we ask whether and to what extent vascular plant species establishment (i.e., the ability to establish self-sustaining populations within a certain time span) is driven by interactions of species functional traits, native status, and the type of ecosystem species occur in, with types of ecosystems distinguished by their degree of ecosystem novelty. To answer this question, we use a dataset of 1,178 vascular plant species occurring in Berlin, Germany that originally had been compiled to substantiate the Berlin Red List of endangered plant species. This dataset classifies native and non-native species into casual and established species based on a minimum of 25 years of expert observation. Whether a species is established or casual is distinguished among four broad types of ecosystems: natural remnant, hybrid, novel immature, and novel mature ecosystems. Moreover, we classify species into those native to Berlin and non-native species (split into archaeophytes and neophytes), and link species to selected functional traits and indicator values. By applying ordinal regression within a Bayesian framework, we show that traits are key drivers of these establishment processes and that the traits that drive species establishment differ across types of ecosystems. While across traits, more established species are present in natural remnants, low canopy height, annual life span, and late end of flowering specifically promote establishment in novel immature ecosystems. In hybrid ecosystems, low canopy height and reproduction by seeds are beneficial traits, with the latter promoting establishment in novel mature ecosystems, too. Traits were less important in predicting species establishment in native as compared to non-native species. All types of ecosystems add to urban biodiversity, and trait analyses refine our knowledge on how they can be supported in doing so on the long term. This can help in sharpening conservation measures.

Analysis of ecosystem change recent years based on Ecopath models in the Aoshan Bay ecosystem

AbstractEcopath model is a snapshot of a particular ecosystem at a time to quickly reflect the real‐time status, characteristics and nutritional relationships of remaining systems in the water. Based on Aoshan Bay fishery resource data collected in 2006, 2013 and 2018, Ecopath models of the Aoshan Bay ecosystem were constructed for these 3 years using EwE 6.6 software. The models of the Aoshan Bay ecosystem included 15 functional groups. Based on the 3 models, we compared and analysed changes in ecosystem structure and phylogenetic characteristics. The trophic interactions between the 15 functional groups were aggregated within four effective trophic levels at 2006, 2013 and 2018. Most of the functional groups were laid within the trophic levels TL 2 and TL 3. The average trophic levels in 2006, 2013 and 2018 were 2.318, 2.444 and 2.410, respectively. The calculated ecotrophic efficiency (EE) value for this ecosystem was highest for Zooplankton (EE = 0.898, 2006), Nibea albiflora (EE = 0.857, 2013) and other demersal fishes (EE = 0.963, 2018). In this study, the calculated TPP/TR was 4.572 (2006), 4.484(2013), 5.347(2018), which indicates the ecosystem is in a developmental stage (not fully mature), the highest mature ecosystem is 2013 and gradually decrease in 2018. In 2013, the FCI is 4.814 and higher ecosystem's maturity than 2006 and 2018, indicating high utilization of primary productivity and detritus. Through analysis of Ecopath models for different years, the characteristics of ecosystem changes in the Aoshan Bay over the past decade were revealed, indicating that the Aoshan Bay ecosystem is still in an unstable and immature state, which provides scientific reference materials for the restoration of fishery resources in this sea area.

THE EVOLUTION OF MYCORISIAN FUNG AS SYMBIOTIC PARTNERS

The article analyzes the evolution of mycorrhizal fungi, which served as symbiotic partners in association with plants, more precisely with their root system. The advantage brought by the existence of mycorrhizal symbioses for plant nutrition, highlighted the influence this association has on plant growth and development. The existence of mycorrhizal fungi was demonstrated approximately 400 million years ago, the first discoveries being the fossils of Aglaophyton major plants that showed traces of arbuscules, these being considered edifying transfer structures for the vesicular-arbuscular endomycorrhizal type. Mycorrhizae are present in mature ecosystems, ecosystems that present a cyclical and unitary evolution of the components between the biotic and abiotic unit, at which point the mycorrhizal associations have the role of regulating the assimilation of food resources for the plants with which they are associated. In this association, hyphae play an important role in the nutrient cycle, having the function of stopping losses from the ecosystem

How The Livestream Marketing Model Influence the Consumer Decision-Making Process Amid the COVID-19?

The emerging of new media platforms and technology advancements is changing the landscape of online retailing and "touchpoints" in the consumer journey. How does the livestream marketing model influence the consumer decision-making process, and why it achieves exponential market growth within years are significant to answer? This article utilized the Five-Stage Model of the Consumer Buying Process, content, and data analysis method to conduct an in-depth case study of Alibaba's Taobao T-mall "Double 11" livestream marketing campaign amid COVID-19. The result shows that livestream marketing plays as an amplifier and filter that stimulates consumers to make the most cost-efficient purchase choices and largely shortens decision-making time. It undertakes the responsibilities of simultaneously entertaining the audience with intriguing digital content and providing consumers with seamless purchase experiences. The high integration degree between supply chain and livestreamers, showrooms and online e-commerce stores, brands and consumers empowers livestream marketing to convert public traffic pools into precisely segmented private traffic communities. Supported by a mature ecosystem, livestreaming will help create a multi-win situation for brands, consumers, online retailers, livestreamers, and e-commerce platforms with a lower barrier to entry and higher conversion rate across niche markets. This article is applicable to further studies in the academic fields of digital marketing, online retailing, psychology, economics, business, and sociology. It will also provide marketers and brands with strategic tools to better understand consumers' decision-making process, adapt to new alternations of "moment that matters", precisely target segmented audience groups, and enhance overall business performance.

Urban sustainability: Lessons from organisms and ecosystems

AbstractThe services essential for urban life include provision of electricity and water, disposal of sewage and solid waste, and management of stormwater. In the past two centuries, the infrastructure providing these services has become increasingly large and centralized, which from a sustainability perspective is problematic. I argue that, to be sustainable, a city must be integrated like a living organism, while having the resilience properties of a mature ecosystem. For the provision of infrastructure, this means that today's massive, highly centralized facilities must give way to more distributed yet interconnected systems.

Unity in a Time of Uncertainty: Ithra’s Approach During the Pandemic in Saudi Arabia

One landmark of the Saudi cultural scene in the time of Covid-19 has been the King Abdulaziz Center for World Culture (also known as Ithra), a recently opened Saudi cultural institution that features museums, a library, a cinema, a theatre, a children’s museum and more. Ithra’s mission is ‘to make a tangible and positive impact on human development by inspiring a passion for knowledge, creativity and cross-cultural engagement for the future of the kingdom’. It is particularly unusual insofar as the Kingdom of Saudi Arabia has historically counted few museums and has an underdeveloped cultural ecosystem. The nation has been undergoing an intentional transformation with Vision 2030. The programme includes vast investment in the cultural and creative sector, advancement of the quality of life and the development of cultural and creative industries (CCI). This article aims to map and understand the effect of the Covid-19 pandemic on Ithra’s institutional presence and programming. It argues that the challenges of the pandemic – which are expected to lead to the permanent closure of more than 15 per cent of the world’s museums – became an opportunity to expand Ithra’s efforts to widen its relationships with audiences, communities, creative professionals and institutional stakeholders. Saudi Arabia’s response to the Covid-19 pandemic has placed it at the highest ranks on international indexes in 2021. This article will present three different initiatives that showcase the tactics of the institution during and post-lockdown, highlighting key achievements. When Ithra opened to the public in 2018, there was no pre-existing audience for cultural offerings. Ithra had to create and engage audiences, position itself as an active member of the different communities and raise awareness related to culture and creativity in the whole region. Its focus on outreach and its diverse offerings have been essential components of Ithra’s existence. In some cases, Ithra has found more success than its established international peers that exist in mature CCI ecosystems. During lockdown, instead of curtailing its offerings, Ithra increased them, greatly expanding by capitalising on its already robust digital and virtual platforms.

Fresh litter acts as a substantial phosphorus source of plant species appearing in primary succession on volcanic ash soil

Plants have difficulty absorbing phosphorus from volcanic ash soils owing to the adsorption of phosphorus by aluminum and iron in the soils. Thus, on volcanic ash soils, the phosphorus source for natural vegetation is expected to be organic matter, however, there is a lack of experimental evidence regarding this occurrence. Here, we studied the effect of organic matter on plant growth of some species that occur in primary successions of volcanic ash soil ecosystems, based on growth experiments and chemical analyses. We found that a large amount of inorganic phosphorus (but only a limited amount of inorganic nitrogen) is leached from fresh leaf litter of the pioneer spices Fallopia japonica at the initial stage of litter decomposition. Phosphorus from the fresh litter specifically activated the growth of subsequently invading nitrogen-fixing alder when immature volcanic soil was used for cultivation. In contrast, old organic matter in mature soil was merely a minor source of phosphorus. These results suggest that fresh litter of F. japonica is essential for growth of nitrogen-fixing alder because the litter supplies phosphorus. We consider that rapid phosphorus cycles in fresh litter-plant systems underlie the productivity of natural vegetation even in mature ecosystems established on volcanic ash soils.

Ground beetle (Coleoptera, Carabidae) communities as natural indicators of ecosystem restoration on the terminated fly ash dump of the thermoelectric power station (Novosibirsk, Russia)

The aim of the study. The aim of the study was to reveal regularities in the development of ground beetles (Coleoptera, Carabidae)’ communities, to determine their species peculiarities as dependent on soil formation rate and soil ecology in the ecosystems developed on the terminated fly ash dump of the thermoelectric power station over nine years of restoration. Location and time of the study. The main object of the study was a terminated fly ash dump No.1 of the thermoelectric power station No.5 in Novosibirsk, Russia. (54°59' NL, , 83°03' EL). Soil samples were collected in 2019, whereas the ground beetles were collected in 2017 and 2019. Methodology. Six study sites, corresponding to the fly ash dump sedimentation zones, were chosen. The undisturbed white birch forest and clover-brome meadow were chosen as controls representing mature climax ecosystems. Soil cover, developing on the fly ash dump after its termination, was described according to the soil classification of technogenic landscapes, and was shown to consist of various types of embryozems (Technosols). Soil water content on each study site was measured in 0–5cm layer by gravimetric method. Soil samples were collected in May 2019. To collect ground beetles five traps were placed on each study site, each trap filled up to 1/3 of its volume with 4% acetic acid for fixing the trapped beetles. The beetles were collected in May–June 1017 and in June–July 2019. The data obtained were used to calculate α-biodiversity indices and perform cluster analysis using PAST v.3.09 software. Main results. Altogether 74 species of the ground beetle we found: 60 species of ground beetles were identified in the revegetating fly ash dump areas, with 48 species found at the sites amended with potentially fertile substrate (PFS), and 35 species found at the sites without PFS addition. The control sites under birch forest and meadow had 14 and 10 species, respectively. Thus the ground beetles’ abundance in the reclaimed area was almost 3 times greater than in the non-reclaimed area (973 specimens vs. 347). Cluster analysis discriminated three groups in the studied fly ash dump sites, namely dry non-reclaimed sites, dry PFS sites and moist sites. Soil cover of the studied fly ash dump was represented by initial, organic matter accumulating, humus-accumulating and sod embryozems (Technosols). Conclusion. Over nine years of spontaneous restoration at the terminated fly ash dump of the thermoelectric power station species rich and abundant communities of ground beetles were formed. These communities differed significantly from those at the adjacent undisturbed climax ecosystems used for comparison. Species richness and dynamic density of ground beetles was shown to increase from the control sites to non-reclaimed sites and PFS-reclaimed sites. The autonomous position in the catena was found to be occupied by the less evolutionary developed embryozem type, whereas downwards along the catena, i.e. with increasing soil moisture content, identified soil types belonged to higher evolutionary order. Therefore technical recultivation with fly ash dump overlaying with potentially fertile substrate or fertile soil allow accelerating soil cover development, as well as the development of an entire biogeocenosis.