Common Pool Research Articles

Identification of fusarium head blight resistance markers in a genome-wide association study of CIMMYT spring synthetic hexaploid derived wheat lines

Fusarium head blight (FHB), caused by Fusarium graminearum, is one of the most destructive wheat diseases worldwide. FHB infection can dramatically reduce grain yield and quality due to mycotoxins contamination. Wheat resistance to FHB is quantitatively inherited and many low-effect quantitative trait loci (QTL) have been mapped in the wheat genome. Synthetic hexaploid wheat (SHW) represents a novel source of FHB resistance derived from Aegilops tauschii and Triticum turgidum that can be transferred into common wheat (T. aestivum). In this study, a panel of 194 spring Synthetic Hexaploid Derived Wheat (SHDW) lines from the International Maize and Wheat Improvement Center (CIMMYT) was evaluated for FHB response under field conditions over three years (2017–2019). A significant phenotypic variation was found for disease incidence, severity, index, number of Fusarium Damaged Kernels (FDKs), and deoxynivalenol (DON) content. Further, 11 accessions displayed < 10 ppm DON in 2017 and 2019. Genotyping of the SHDW panel using a 90 K Single Nucleotide Polymorphism (SNP) chip array revealed 31 K polymorphic SNPs with a minor allele frequency (MAF) > 5%, which were used for a Genome-Wide Association Study (GWAS) of FHB resistance. A total of 52 significant marker-trait associations for FHB resistance were identified. These included 5 for DON content, 13 for the percentage of FDKs, 11 for the FHB index, 3 for disease incidence, and 20 for disease severity. A survey of genes associated with the markers identified 395 candidate genes that may be involved in FHB resistance. Collectively, our results strongly support the view that utilization of synthetic hexaploid wheat in wheat breeding would enhance diversity and introduce new sources of resistance against FHB into the common wheat gene pool. Further, validated SNP markers associated with FHB resistance may facilitate the screening of wheat populations for FHB resistance.

Afferent convergence to a shared population of interneuron AMPA receptors

Precise alignment of pre- and postsynaptic elements optimizes the activation of glutamate receptors at excitatory synapses. Nonetheless, glutamate that diffuses out of the synaptic cleft can have actions at distant receptors, a mode of transmission called spillover. To uncover the extrasynaptic actions of glutamate, we localized AMPA receptors (AMPARs) mediating spillover transmission between climbing fibers and molecular layer interneurons in the cerebellar cortex. We found that climbing fiber spillover generates calcium transients mediated by Ca2+-permeable AMPARs at parallel fiber synapses. Spillover occludes parallel fiber synaptic currents, indicating that separate, independently regulated afferent pathways converge onto a common pool of AMPARs. Together these findings demonstrate a circuit motif wherein glutamate ‘spill-in’ from an unconnected afferent pathway co-opts synaptic receptors, allowing activation of postsynaptic AMPARs even when canonical glutamate release is suppressed.

Community-based climate adaption: A perspective on the interface between a common pool resource system and an individual-based market transaction system

Because of land privatisation and marketisation in rural areas, community-based adaptation to climate change may face new challenges. A field survey conducted on the Qinghai–Tibetan Plateau (QTP) shows that herders with a grassland collective management system (CMS) suffer higher livestock mortality than those with an individual management system (IMS) during the same extreme climatic events, in contrast to previous research findings. This study seeks to explain this contrast. The results show that although local herders have begun to rely on market-related adaptation strategies to cope with climate change, IMS herders are more inclined to rent-in grassland, while CMS herders are more inclined to purchase fodder. The high-cost grassland renting-in strategy reduces livestock mortality and total household economic loss more effectively than purchasing fodder during snow disasters. An important reason for this is that IMS strengthens market concepts and promotes interaction between herders and external markets, especially the grassland rental market, while CMS continues past grazing traditions and maintains traditional social relationships and collective concepts within the community. CMS herders fail to rent-in grassland due to psychological free-riding incentives and scale mismatch. In the face of repeated climatic disasters, however, CMS herders have also begun to overcome various obstacles to entering the grassland rental market through self-organization and are gradually forming a new pathway of adaptation to climate change.

Prenatal Development of Muscle and Adipose and Connective Tissues and Its Impact on Meat Quality

The abundance of intramuscular fat (marbling) and tenderness are 2 key determining factors of beef quality,whereas muscle growth determines the meat production efficiency. Marbling accumulation is due to both hyperplasia and hypertrophy of intramuscular fat cells (adipocytes). On the other hand, intramuscular fibroblasts are major contributors for the formation of connective tissue and its cross-linking, which are responsible for background toughness of beef.Interestingly, muscle cells, adipocytes, and fibroblasts are derived from a common pool of mesenchymal progenitors during embryonic development. In the early embryos, a portion of progenitor cells in anlage commit to the myogenic lineage,whereas nonmyogenic cells become adipo-fibrogenic cells or other cells. These myogenic cells proliferate extensively and further develop into primary and secondary muscle fibers and satellite cells, whereas adipo-fibrogenic cells form the stromal-vascular fraction of muscle where intramuscular adipocytes and fibroblasts reside. Strengthening prenatal myogenesis and muscle development enhances lean growth, whereas promoting intramuscular adipocyte formation elevates marbling. Because the abundance of progenitor cells in animals declines as their development progresses, it is more effective to manipulate progenitor cell differentiation during early development. Maternal nutrition and other environmental factors affect progenitor cell commitment, proliferation, and differentiation, which programs muscle growth and marbling fat development of offspring, affecting the quantity and quality of meat production.

SUSTAINABLE BUSINESS MODELS IN ENHANCING REGIONAL PRODUCT COMPETITIVNESS

The study analyzes the problem of implementing the green economy to improve the regional level of product competitiveness and examines business models for achieving sustainable development. When analyzing modern business models, a model of a “green” economy is proposed that allows resource efficiency in the economic space of the region. The activity of an enterprise planning the implementation of a green economy model is considered, and it focuses on certain areas of action that can increase the level of competitiveness of its products. The study analyzes areas of resource optimization, one of which is the existence of common pool resources. Citizens of different countries were surveyed on their attitudes toward common pool resources’ state and quality. It is concluded that there are not enough resources to finance the green sector, and there is a problem with monitoring the common-pool resources. At the same time, most respondents wish to privately own common-pool resources, which indicates the particularities of national culture, distrust of government, and efficient use of resources in private ownership, namely the desire to serve certain enterprises alone or their households to obtain individual utility rather than optimize the available resources. It concluded that it is necessary to develop environmental awareness and responsibility in the population, which can positively affect the regional level of competitiveness of products and increase the level of education of citizens, to adopt non-formal education in the country, optimize all existing systems that would be based on innovations, and reduce the negative environmental footprint.

Historical contingency in parasite community assembly: Community divergence results from early host exposure to symbionts and ecological drift.

Host individuals are commonly coinfected with multiple parasite species that may interact to shape within-host parasite community structure. In addition to within-host species interactions, parasite communities may also be structured by other processes like dispersal and ecological drift. The timing of dispersal (in particular, the temporal sequence in which parasite species infect a host individual) can alter within-host species interactions, setting the stage for historical contingency by priority effects, but how persistently such effects drive the trajectory of parasite community assembly is unclear, particularly under continued dispersal and ecological drift. We tested the role of species interactions under continued dispersal and ecological drift by simultaneously inoculating individual plants of tall fescue with a factorial combination of three symbionts (two foliar fungal parasites and a mutualistic endophyte), then deploying the plants in the field and tracking parasite communities as they assembled within host individuals. In the field, hosts were exposed to continued dispersal from a common pool of parasites, which should promote convergence in the structure of within-host parasite communities. Yet, analysis of parasite community trajectories found no signal of convergence. Instead, parasite community trajectories generally diverged from each other, and the magnitude of divergence depended on the initial composition of symbionts within each host, indicating historical contingency. Early in assembly, parasite communities also showed evidence of drift, revealing another source of among-host divergence in parasite community structure. Overall, these results show that both historical contingency and ecological drift contributed to divergence in parasite community assembly within hosts.

Timescale separation in the coordinated switching of bacterial flagellar motors

The output of the bacterial chemotaxis signaling pathway, the level of the intracellular regulator CheY-P, modulates the rotation direction of the flagellar motor, thereby regulating bacterial run-and-tumble behavior. The multiple flagellar motors on an E. coli cell are controlled by a common cytoplasmic pool of CheY-P. Fluctuation of the CheY-P level was thought to be able to coordinate the switching of multiple motors. Here, we measured the correlation of rotation directions between two motors on a cell, finding that it surprisingly exhibits two well separated timescales. We found that the slow timescale (∼6 s) can be explained by the slow fluctuation of the CheY-P level due to stochastic activity of the chemotactic adaptation enzymes, whereas the fast timescale (∼0.3 s) can be explained by the random pulse-like fluctuation of the CheY-P level, due probably to the activity of the chemoreceptor clusters. We extracted information on the properties of the fast CheY-P pulses based on the correlation measurements. The two well-separated timescales in the fluctuation of CheY-P level help to coordinate multiple motors on a cell and to enhance bacterial chemotactic performance.

The endogenous formation of common pool resource coalitions

We present the results of framed field (lab-in-field) experiments designed to investigate the endogenous formation of common pool resource (CPR) coalitions when the resource is co-defended with costly monitoring by coalition members and sanctions for encroachment imposed by the government. The experiments were conducted with fishers who were members of Chile's territorial use rights fisheries (TURFs) and in the lab with Chilean university students. Consistent with theoretical predictions, the fishers frequently formed CPR coalitions, even when they could not deter outsider poaching. When the cost of monitoring was low, fishers frequently formed the grand coalition. Coalitions tended to be smaller when monitoring was more costly, but not significantly so. However, coalitions were significantly smaller when monitoring was not available relative to when the cost of monitoring was low. Fishers also invested in monitoring frequently and these investments reduced poaching. When coalitions formed, total harvest effort was curtailed and earnings for coalition members generally increased. Students formed coalitions less frequently, these coalitions tended to be small, and they infrequently invested in monitoring, even when it was profitable to do so. Consequently, student coalition members were not better off on average than under open access.

Negative externality on service level across priority classes: Evidence from a radiology workflow platform

AbstractWe study the potential negative impact of imbalanced compensation schemes on firm performance. We analyze data from a radiology workflow platform that connects off‐site radiologists with hospitals. These radiologists select tasks from a common pool, while service level is defined by priority‐specific turnaround time targets. However, imbalances between pay and workload of different tasks could result in higher priority tasks with low pay‐to‐workload ratio receiving poorer service. We investigate this hypothesis, showing turnaround time is decreasing in pay‐to‐workload for lower priority tasks, whereas it is increasing in workload for high‐priority tasks. Crucially, we find evidence of an externality effect: Having many economically attractive tasks with low priority can lead to longer turnaround times for higher priority tasks, increasing their likelihood of delay, thus partially defeating the purpose of the priority classes.

PO-01-209 THE MECHANISMS OF IMPAIRED CALCIUM HANDLING UNDERLYING THE INCREASED SUSCEPTIBILITY TO ATRIAL FIBRILLATION IN METABOLIC SYNDROME

Atrial fibrillation (AF) is becoming increasingly common partly due to the prevalence of metabolic syndrome (MetS). Altered Ca2+-handling proteins on the atrial cellular membrane as well as across the sarcoplasmic reticulum (SR) network and axial tubules due to this condition can precipitate AF through elevation of Ca2+ in junctional clefts, triggering Ca2+ sparks. Through the stochastic recruitment of these sparks, a Ca2+ wave can manifest to activate neighbouring ryanodine receptors (RyRs), stimulating Na+/Ca2+ exchangers (INaCa) into potentially triggering arrhythmogenic spontaneous action potentials (SAPs). However, the mechanisms by which MetS can disrupt Ca2+ handling and trigger SAPs is not well understood. To investigate the mechanisms of impaired calcium handling underlying the increased susceptibility to AF in MetS. We utilized a 3D model of subcellular Ca2+ signalling by Zhang et al. 2022, which compromises of a network of Ca2+-release units (CRUs) and ion channel and exchanger formulations from the Grandi et al. common pool model. The Zhang et al. model far more accurately captures the processes by which Ca2+ sparks can occur and terminate through the inclusion of crucial membrane ion channels/transporters within the extensive network of axial tubules interwoven across the CRUs (Fig A). Based on experimental studies, MetS meditated functional change in Ca2+-handling proteins was replicated by increasing the conductivity of SERCA and RyR and reducing ICaL and INaCa. To evaluate the contribution of each individual remodeled Ca2+-handling component to the membrane potential and Ca2+ sparks, a series of simulations was conducted where we first incorporated each individual ionic remodeling into the control model, then from the MetS model, we reversed each remodeled Ca2+-handling component separately. We have demonstrated that SAPs were attributed to a decrease in INaCa and an increase in SERCA. For the former, this also corresponded to a much greater incidence of Ca2+ sparks compared to other cases. However, for the latter, increasing SERCA surprisingly had a negligible impact on the genesis of these sparks (Fig B). This suggests that an alternate pathway can potentially exist by which upregulated SERCA function can induce SAPs. Increased Ca2+ spark incidence due to functional changes in Ca2+-handling proteins is not the sole mechanism to SAP genesis. Our study therefore highlights that MetS-mediated AF can occur through different pathways.

Multi-Fault Classification and Diagnosis of Rolling Bearing Based on Improved Convolution Neural Network.

At present, the fault diagnosis methods for rolling bearings are all based on research with fewer fault categories, without considering the problem of multiple faults. In practical applications, the coexistence of multiple operating conditions and faults can lead to an increase in classification difficulty and a decrease in diagnostic accuracy. To solve this problem, a fault diagnosis method based on an improved convolution neural network is proposed. The convolution neural network adopts a simple structure of three-layer convolution. The average pooling layer is used to replace the common maximum pooling layer, and the global average pooling layer is used to replace the full connection layer. The BN layer is used to optimize the model. The collected multi-class signals are used as the input of the model, and the improved convolution neural network is used for fault identification and classification of the input signals. The experimental data of XJTU-SY and Paderborn University show that the method proposed in this paper has a good effect on the multi-classification of bearing faults.

The Mode of Communication as a Driver of Sustainable and Equitable Asymmetric Common Pool Resource Use

Most experimental studies on common pool resource usage focus on situations in which actors are in symmetric positions when they use the resource. Many real-world cases do not fit this scenario because users are in asymmetric positions regarding their ability to benefit from the resource. Examples range from irrigation systems to climate change mitigation. Moreover, while there is large evidence on the effects of communication on social dilemmas, few studies focus on different modes of communication. We compare the effects of unstructured and structured communication on the provision of an infrastructure for a common pool resource and appropriation of the provided resource. Structured communication applied rules that are based on the ideals of democratic deliberation. Participants made contribution and appropriation decisions in an incentivized experiment. In the experiment, both communication and deliberation increased contributions in comparison to a baseline. Interestingly, deliberation attenuated the effect of the player position more than communication. Our results suggest that deliberation may be useful for overcoming asymmetric commons dilemmas in the field.

Fishermen’s competitiveness and labour market performance: Evidence from shrimpers in Bangladesh

AbstractWe conduct an experiment to determine competitiveness among shrimpers who engage in collecting shrimp seeds in the southwestern coastal region of Bangladesh. We then examine how competitiveness affects the labour supply decisions and labour market performance of these shrimpers. Our results show that shrimpers who prefer competition are more productive than shrimpers who do not prefer competition. Competitive shrimpers secure better prices and earn higher incomes selling their catches. We estimate that their wage elasticity of participation ranges from 0.4 to 0.5, which is consistent with preferences under neoclassical assumptions. Competitive shrimpers have a slightly greater wage elasticity than non‐competitive shrimpers, suggesting that they might be more responsive to expected earnings. Our results have important policy implications for the efficient management of common pool resources.

Resetting the forestry commons: Constitutionality as a conflict resolution strategy in African woodlands

This paper comparatively analyses three case studies in Mali, Senegal and Tanzania regarding common property institutions for forest commons and their transformations during colonial and post-colonial times. Then common pool resource management was fragmented and common property was increasingly turned into state and private property and local control over resources was removed. This led to grabbing processes by foreign investors and conflicts between local and outside users of forest resources and degradation of these resources. The paper further outlines the reactions to these processes. It also highlights the neglect of the gender and marginal groups dimensions in studies of constitutionality (developing a sense of local ownership in the bottom-up institution crafting processes for the governance of the commons). In the cases of Mali and Senegal these constitutionality processes were for managing the forest resources. This led to a mitigation of existing resource conflicts. In Tanzania, out of a land-use conflict, local people had managed to create a kind of an informal convention with a British investor about land use in the valleys, which however remains fragile. The conflict arose because women had largely been left out in land deal negotiations and institution-building about the acquired land, as well as were confronted with institution-shopping by the investor and from below by fellow community- and family-men. This impacted heavily on their workload and hampered their abilities to fulfil their care work. Thus, this paper fills the gap on gender (and more differentiated – intersectionality, and generally the involvement of marginal groups) in the constitutionality process to support the “resetting of the forest commons”. These have been neglected factors that need to be addressed for successful forest resources management and governance.

Noun phrases in mixed Martinican Creole and French

AbstractContact between French and Martinican Creole (MC) takes place in a society where bilingualism is the standard, in a situation of constant language mixing. French and MC, although related, show significant typological divergences on some specific features, e.g. the order between noun and definite determiner in the noun phrase, or the use of a linker to mark a possessive embedded noun phrase. In this paper, I explore the possible combination of the different values of these features in mixed noun phrases occurring in corpora. I inquire about the possible parameters which may influence the outcome and explain the relative frequencies of these different combinations. It appears that there is a partially common pool of elementary structures. Many utterances fall into the category termed byMuysken (2000)‘congruent lexicalization’. I also observe that apparent complex double embeddings have an internal logic, as they result from adjunction of multi-word modifiers. Finally I propose a model which accounts for the observed occurrences by postulating a level in the speech generation process where language itself is underspecified, and where it is in a position to be specified on the fly by contextual factors, coming either from the lexicon or from the constructional frame.

Social exclusion with antisocial punishment in spatial public goods game

In the spatial public goods game (SPGG), social exclusion is an effective strategy to quickly promote group cooperation. However, the second-order free riding occurs among cooperators who do not bear additional exclusion costs in the process of exclusion. To ensure that the exclusion strategy works while solving the second-order free-riding problem, we introduce an antisocial punishment strategy. The model employs four counterbalancing strategies: pure cooperators invest into the public pool; the defectors are the first-order free-riders of the cooperators; the excluders restrict the defectors from riding the cooperators with a certain probability, and the excluded defectors cannot share the benefits of the common pool; and the antisocial punishers punish the cooperators. Through the Monte Carlo simulations, we found that the cooperative excluders protected the cooperators from invasion by defectors and defective punishers, and more importantly, the second-order free-riding problem of the system was eliminated by the defective punishers.

Local government amalgamations and pre-merger overspending: Central naivety meets local opportunism

ABSTRACT Amalgamation of local governments is an incentive for pre-merger overspending as the costs are transferred to the merged unit of the future. The article updates application of the common pool theory to such opportunistic pre-merger behavior. It studies Norway’s reform of the 2010s and paints a uniquely nuanced picture of pre-merger overspending, comparing fiscal policies before and after enactment of the reform among merging and non-merging municipalities. It provides corroboration that local governments that are about to merge overspend prior to the merger. New insights are gained into local governments’ differential incentives to allocate overspending to capital or current expenditure, and their opportunities to act on these incentives in the final and penultimate years before mergers are implemented. New insights are also gained into the differential incentive structures of junior and senior partners to a merger. Juniors overspend the most on current expenditure, while junior and senior partners overspend equally on capital expenditure. These insights not only have theoretical value but also practical applications.

From “Common Pools” to “Fish Pools”: Shifting Property Institutions in Traditional Waters of Norway and Canada

Although exclusive common pool resource management regimes have locally been applied since time immemorial in many coastal and fjord areas, in the legal conceptualization of space, the oceans and their living resources were traditionally treated as a “global commons.” The idea of restricting access to coastal oceanic resources and delegating their governance to state instruments has become increasingly popular since the middle of the previous century when political economy models predicted the eventual overexploitation or degradation of all resources used in common. While state jurisdictions overall continue to preserve the idea of common access to marine living resources for a state’s people, the rapid privatization of marine living resources and the subsequent development of aquaculture over the last few decades, often confront this understanding, leading to enclosure of a delineated maritime area that was initially intended to be accessible to the public. Enclosing the sea for the purpose of aquaculture development leads to a semantic change in property institutions that govern coastal areas and provides for a form of enclosure of the commons in key locations designated for marine aquaculture development. This article explores the concept of “ocean commons” and debates how the enclosure of common areas for the purposes of aquaculture development may collide with Indigenous and local conceptions of common pool resource management. The article applies this theoretical investigation on two examples from Canada and Norway, and suggests that rethinking aquaculture development in coastal waters through the lens of “ocean commons” may provide a guiding ethos for revisiting current approaches of access to the sea and ensuring the harmonious coexistence between aquaculture development and local/Indigenous traditional activities.

Deterrence through punishment can resolve collective risk dilemmas in carbon emission games.

Collective risk social dilemmas are at the heart of the most pressing global challenges we are facing today, including climate change mitigation and the overuse of natural resources. Previous research has framed this problem as a public goods game (PGG), where a dilemma arises between short-term interests and long-term sustainability. In the PGG, subjects are placed in groups and asked to choose between cooperation and defection, while keeping in mind their personal interests as well as the commons. Here, we explore how and to what extent the costly punishment of defectors is successful in enforcing cooperation by means of human experiments. We show that an apparent irrational underestimation of the risk of being punished plays an important role, and that for sufficiently high punishment fines, this vanishes and the threat of deterrence suffices to preserve the commons. Interestingly, however, we find that high fines not only avert freeriders, but they also demotivate some of the most generous altruists. As a consequence, the tragedy of the commons is predominantly averted due to cooperators that contribute only their "fair share" to the common pool. We also find that larger groups require larger fines for the deterrence of punishment to have the desired prosocial effect.

Utilizing Genomics to Characterize the Common Oat Gene Pool—The Story of More Than a Century of Polish Breeding

This study was undertaken to investigate the diversity and population structure of 487 oat accessions, including breeding lines from the ongoing programs of the three largest Polish breeding companies, along with modern and historical Polish and foreign cultivars. The analysis was based on 7411 DArTseq-derived SNPs distributed among three sub-genomes (A, C, and D). The heterogeneity of the studied material was very low, as only cultivars and advanced breeding lines were examined. Principal component analysis (PCA), principal coordinate analysis (PCoA), and cluster and STRUCTURE analyses found congruent results, which show that most of the examined cultivars and materials from Polish breeding programs formed major gene pools, that only some accessions derived from Strzelce Plant Breeding, and that foreign cultivars were outside of the main group. During the 120 year oat breeding process, only 67 alleles from the old gene pool were lost and replaced by 67 new alleles. The obtained results indicate that no erosion of genetic diversity was observed within the Polish native oat gene pool. Moreover, current oat breeding programs have introduced 673 new alleles into the gene pool relative to historical cultivars. The analysis also showed that most of the changes in relation to historical cultivars occurred within the A sub-genome with emphasis on chromosome 6A. The targeted changes were the rarest in the C sub-genome. This study showed that Polish oat breeding based mainly on traditional breeding methods-although focused on improving traits typical to this crop, i.e., enhancing the grain yield and quality and improving adaptability-did not significantly narrow the oat gene pool and in fact produced cultivars that are not only competitive in the European market but are also reservoirs of new alleles that were not found in the analyzed foreign materials.