Does Recruitment trigger negative Density-Dependent Feedback loops in Stream-Dwelling Salmonids?

I explored the hypothesis that recruitment may stabilize the numerical dynamics of stream-dwelling salmonids by triggering density-dependent feedback loops through the operation of recruitment-dependence on individual growth, mortality, life span and maximum size and their effects on fecundity. I examined 98 cohorts of two Salmo trutta populations of northern Spain and a population of Jutland (Denmark) located 2400 km apart Recruitment, growth, mortality, life span and maximum size were inter-related, were recruitment-dependent and described negative power trajectories. In the Spanish populations, faster growing individuals of weakly recruited cohorts with lower mortality attain longer life span and larger size. Hence, larger females spawning more abundant, larger eggs that, in turn, induce stronger cohorts of higher spawners’ abundance, recruitment and mortality. The mortality patterns match the self-thinning patterns, an ultimate expression of competition. Significant relationships among self-thinning slopes and mortalities rates with increasing recruitment demonstrate that the rate at which density-driven mortality is higher, the stronger the intensity of intraspecific competition. Space-limited habitat and size-dependent resource availability underpinning site-specific carrying capacities suggest that interference competition is the primary mechanism underpinning population regulation.

System dynamics approach of knowledge transfer from projects to the project-based organization

PurposeAlthough knowledge transfer in the context of projects and project-based organizations (PBOs) has gained increasing attention from academia and industry, it is not clear how knowledge transfers from projects to their parent PBOs. This research aims to explore the main factors influencing knowledge transfer from projects to their parent PBOs, and analyze how these factors integrate the transfer process as system components using the system dynamics (SD) method.Design/methodology/approachBased on the literature review, investigation and interview, this paper adopts the event analysis to obtain the influencing factors from historical cases and establishes a conceptual model of knowledge transfer from five dimensions, which simultaneously considers the knowledge sender, knowledge receiver and the relationship between the knowledge sender and receiver, knowledge features and transfer context. Then, the relationships between variables in the qualitative model were clarified, and a quantitative model including seven feedback loops was established using the SD model. Lastly, the system simulation and sensitivity analysis of the main parameters were realized in Vensim PLE software.FindingsThe simulation analysis results show that the model can simulate the knowledge transfer process from projects to the PBO to a certain extent. This research fully demonstrates the impact of variables from five dimensions on knowledge transfer and incorporates the knowledge gap and transfer threshold in the research category. Moreover, the rationality of seven feedback loops proposed in the model was verified. And the effects of various factors on the amount of knowledge transferred and the PBO's knowledge stock were examined through sensitivity analysis. Furthermore, recommendations for developing an integrated knowledge transfer mechanism of PBOs and projects to enhance transfer effect are offered.Research limitations/implicationsThis research provides other researchers with a systematic understanding of transfer process from projects to PBOs, and insight for further research on knowledge transfer in project and organization contexts. Furthermore, this study guides researchers to focus on the causal processes that constitute knowledge transfer and explores the expected and unexpected phenomena generated over time. However, some variables involved in the transfer process are simplified, and the establishment of a more complex dynamic model needs further research and discussion.Practical implicationsBy establishing a simulation model for knowledge transfer from projects to their parent PBOs, this study helps project teams and PBOs grasp the overall picture of the transfer process. Especially, this paper provides target-oriented recommendations for project and PBO managers to implement effective knowledge transfer practices, which have certain practical values for knowledge cultivation, coordination, reuse and innovation in the organization.Originality/valueThis study contributes to knowledge management and project management literature by simulating the knowledge transfer process from projects to their parent PBOs. Additionally, this paper provides a reference for PBO and project managers to establish an integrated knowledge-transfer mechanism in the work process and comprehensively implement effective knowledge transfer practices.

Service ecosystems: why the media industry prefers access, not ownership

Purpose Because of the increasing importance of access over ownership, the purpose of this paper is to propose a service ecosystem perspective to help managers navigate hypercompetition. With the rise of cloud-based services and the ongoing recovery from the COVID-19 pandemic, the global economy has shifted toward hypercompetition, a state characterized by organizational advantages that are rapidly created and then destroyed by intense competitive moves. Because advantages are quickly eroded, organizations must be aggressive in the number of actions they take and the speed with which they execute these actions. The service ecosystem perspective focuses on relationships that allow organizations to jointly adjust to one another and to their environment. Design/methodology/approach This paper first reviews traditional strategies for navigating hypercompetition. Then, it presents an explanation of the service ecosystem perspective. Finally, the three north stars and media examples are provided. Findings The service ecosystem perspective asserts “north stars” that can guide managerial decision-making in hypercompetitive environments. These north stars are: cultivate system norms, facilitate feedback loops and embrace servitization. Originality/value In today’s world, organizations are increasingly seeking access to resources instead of ownership of them. The proposed approach suggests that, rather than an organization owning the resources it needs to achieve advantages, organizations are increasingly relying on accessing resources by coordinating with other organizations to draw upon the resource(s) as needed, without incurring the additional burdens of ownership. Examples from the media industry are used to illustrate the three north stars of the service ecosystems perspective.

Digital Platforms for the Common Good: Social Innovation for Active Citizenship and ESG

The platform business model has attracted significant attention in business research and practice. However, much of the existing literature studies commercial platforms that seek to maximize profit. In contrast, we focus on a platform for volunteers that aims to maximize social impact. This business model is called a platform for the common good. The article proposes a Causal Loop Diagram (CLD) model that explains how a platform for the common good creates value. Our model maps the key strategic feedback loops that constitute the core structure of the platform and explains its growth and performance through time. We show that multiple types of network effects create interlocking, reinforcing feedback loops. Overall, the article contributes towards a dynamic theory of the platforms for the common good. Moreover, the article provides insights for social entrepreneurs who seek to build, understand, and optimize platforms that maximize social value and managers of companies that seek to participate in such platforms. Social entrepreneurs should seek to leverage the critical feedback loops of their platform.

The journey of neutropoiesis: how complex landscapes in bone marrow guide continuous neutrophil lineage determination

Neutrophils are the most abundant white blood cell, and differentiate in homeostasis in the bone marrow from hematopoietic stem cells (HSCs) via multiple intermediate progenitor cells into mature cells that enter the circulation. Recent findings support a continuous model of differentiation in the bone marrow of heterogeneous HSCs and progenitor populations. Cell fate decisions both at the level of proliferation and differentiation are enforced through expression of lineage-determining transcription factors (LDTFs) and their interactions, that are influenced by both intrinsic (intracellular) as well as extrinsic (extracellular) mechanisms. Neutrophil homeostasis is subjected to positive feedback loops, stemming from the gut microbiome, as well as negative feedback loops resulting from the clearance of apoptotic neutrophils by mature macrophages. Finally, the cellular kinetics regarding the replenishing of the mature neutrophil pool is discussed in light of recent, contradictory data.

An open systems model of successful school leadership

PurposeThrough description and consideration of 12 models developed as part of the International Successful School Principalship Project (ISSPP), a new model of successful school leadership is developed.Design/methodology/approachThe paper is necessarily descriptive in nature. For the first time, 12 ISSPP models are described together, and these descriptions are then used inductively to create a new successful school leadership model.FindingsThe open systems approach adopted depicts schools as a continuous cycle of input-transformation-output with feedback loops that inform each stage of the cycle. The inputs are the variables that lead to transformation. The transformation stage is the actions or processes that individuals, groups and organisations engage in because of the inputs, and these lead to a range of student and school outcomes. Feedback loops connect the stages, and the whole model is open to the influence of five contextual forces: economic, political, socio-cultural, technological and system, institutional and educational.Originality/valueModels are an important way to make sense of complex phenomena. A new model of successful school leadership, with an open systems approach, provides a different frame to consider the findings of the ISSPP and potentially allows the ISSPP research to inform practice and connect with other school leadership views in new ways.

Critical Transitions in Lake Ecosystem State May Be Driven by Coupled Feedback Mechanisms: A Case Study from Lake Erhai, China

Critical transitions between ecosystem states can be triggered by relatively small external forces or internal perturbations and may show time-lagged or hysteretic recovery. Understanding the precise mechanisms of a transition is important for ecosystem management, but it is hampered by a lack of information about the preceding interactions and associated feedback between different components in an ecosystem. This paper employs a range of data, including paleolimnological, environmental monitoring and documentary sources from lake Erhai and its catchment, to investigate the ecosystem structure and dynamics across multiple trophic levels through the process of eutrophication. A long-term perspective shows the growth and decline of two distinct, but coupled, positive feedback loops: a macrophyte-loop and a phosphorus-recycling-loop. The macrophyte-loop became weaker, and the phosphorus-recycling-loop became stronger during the process of lake eutrophication, indicating that the critical transition was propelled by the interaction of two positive feedback loops with different strengths. For lake restoration, future weakening of the phosphorus-recycling loop or a reduction in external pressures is expected to trigger macrophyte growth and eventually produce clear water conditions, but the speed of recovery will probably depend on the rates of feedback loops and the strength of their coupling.

A Comic Road to Interiors, or the Pedagogical Matter of Gen Z Humor

Generation Z (Gen Z) represents something of a quintessence for the broken promises that now seem to make up the promise of higher education. But if despair indicates the dark side of generational malaise around things like civic engagement, community, and student learning, the dark humor that has emerged out of these generations points to modes of democratic citizenship that are more about reconciliation than resignation. This essay offers a critical reflection on Gen Z humor, its place in college and university classrooms, and its usefulness as a resource for reconsidering how teaching and learning might be tied to a comically examined life. It proceeds with a fresh look at pedagogies of hope as developed by Paulo Freire, Martha C. Nussbaum, bell hooks, Henry A. Giroux, and others. This examination allows for the conceptualization of a comic poësis for understanding how instructional practices that meet students on uncommon ground contribute to the production, creation, and care for personhood as well as public culture. Ultimately, this essay balances theories of a comic teaching praxis with actual activities from the classroom to meditate on a pedagogy of reconciling curricula with who and where students are, beginning and ending with feedback loops.