One challenge to the idea that animals have a moral right to life claims that any such right would require us to intervene in the wild to prevent animals from being killed by predators. I argue that belief in an animal right to life does not commit us to supporting a program of predator-prey intervention. One common retort to the predator challenge contends that we are not required to save animals from predators because predators are not moral (...) agents. I suggest that this retort fails to overcome the predator challenge. I seek to articulate a more satisfactory argument explaining why we are not required to save wild prey from predators and how this position is perfectly consistent with the idea that animals have a basic right to life. (shrink)

One common objection to ethical vegetarianism—that is, vegetarianism for ethical reasons—concerns the morality of the predator-prey relationship. If it is morally acceptable for wolves to kill sheep for food, why is it wrong for human beings to eat meat? The objection raised here is sometimes called the “predation argument.” In this article, I critically examine three versions of the argument.

For decades, myxobacteria have been spotlighted as exemplars of social “wolf‐pack” predation, communally secreting antimicrobial substances into the shared public milieu. This behavior has been described as cooperative, becoming more efficient if performed by more cells. However, laboratory evidence for cooperativity is limited and of little relevance to predation in a natural setting. In contrast, there is accumulating evidence for predatory mechanisms promoting “selfish” behavior during predation, which together with conflicting definitions of cooperativity, casts doubt on whether microbial “wolf‐pack” predation (...) really is cooperative. Here, it is hypothesized that public‐goods‐mediated predation is not cooperative, and it is argued that a holistic model of microbial predation is needed, accounting for predator and prey relatedness, social phenotypes, spatial organization, activity/specificity/transport of secreted toxins, and prey resistance mechanisms. Filling such gaps in our knowledge is vital if the evolutionary benefits of potentially costly microbial behaviors mediated by public goods are to be properly understood. (shrink)

Predation games—games in which the player is actively encouraged and often required to hunt and kill in order to survive—have historically been the purview of male players. Females, though now much more involved in digital games than before, generally play games that stress traditionally feminine values such as socializing with others, shopping, and nurturing. This article argues that playing games that virtually simulate predation has many benefits for female players. Predation play teaches participants how to survive and succeed in stressful, (...) competitive, aggressive environments. To remain in the game, players have to understand and enjoy the acquisition and negotiation of power, learn to face fear, willingly accept challenges, and accept the inevitability of failure without allowing it to deter future attempts. Through predation play, females can learn to excel in and enjoy high-risk high-reward environments. The author proposes that such play might help address gender disparities outside of play. (shrink)

Accumulating data suggest that the eukaryotic cell originated from a merger of two prokaryotes, an archaeal host and a bacterial endosymbiont. However, since prokaryotes are unable to perform phagocytosis, the means by which the endosymbiont entered its host is an enigma. We suggest that a predatory or parasitic interaction between prokaryotes provides a reasonable explanation for this conundrum. According to the model presented here, the host in this interaction was an anaerobic archaeon with a periplasm‐like space. The predator was a (...) small (facultative) aerobic α‐proteobacterium, which penetrated and replicated within the host periplasm, and later became the mitochondria. Plausible conditions under which this interaction took place and circumstances that may have led to the contemporary complex eukaryotic cell are discussed. (shrink)

Predation poses a serious challenge for animal ethics of whatever ilk. For animal rights theory especially, the problem is potentially fatal as animal rights appear to require or permit interfering in nature to prevent predation, an implication that appears to be absurd. Several philosophers have written to deflect this challenge by showing how that implication is not absurd or how the allegedly entailed prescription to intervene does not follow from animal rights theory. A number of philosophers have taken different routes (...) to arrive at the same conclusion that intervention in wildlife predation is not morally permissible or required on the rights view. In this paper, I explore a route hitherto unused to the conclusion that intervention in predation is neither required nor permitted by animal rights theory. I deploy the Hohfeldian analytical framework of rights as well as aspects of the theory of self- or other- defence. This, in my view is the most thorough-going rights perspective on the predation problem. I expose some ad hoc, incoherent, utilitarian, and even speciesist arguments among animal rights solutions to the predation problem. The approach I have used avoids these flaws. Taking animal rights seriously means guarding against any tacit speciesism. I think using Hohfeld’s framework goes some way in keeping rights analysis free of implicit bias that might pollute our arguments in favour of human beings. (shrink)

Conservation policy in New Zealand is centred around an objective to totally eradicate three invasive species; the ship rat, the brushtail possum and the stoat, by 2050. The preferred control method to achieve this is large scale poisoning operations with 1080 and similar toxins. This project is backed up by governmental and non-governmental agencies and surrounded with discourse of ‘war’ and ‘invasion’. The ‘Big Three’ predators are endowed with sinister motives as a means of mobilising support. This self-described ‘war’ (...) is evaluated in terms of ‘just war’ theory and found wanting. In particular there are issues with the recruitment of children for killing, humiliation of combatants, questionable economic motives for the ‘war’, deception by government agencies, lack of consultation, a lack of consideration of alternatives, the use of excessive suffering, and unrealistic expectations. An alternative paradigm of ‘compassionate conservation’ is proposed for New Zealand. Instead of trying to get back to a stable pre-colonial state of nature, I propose a holistic approach that respects both ecosystems and their members and takes into account new understandings of ecosystems as dynamic processes. (shrink)

Animal rights positions face the ‘predator problem’: the suggestion that if the rights of nonhuman animals are to be protected, then we are obliged to interfere in natural ecosystems to protect prey from predators. Generally, rather than embracing this conclusion, animal ethicists have rejected it, basing this objection on a number of different arguments. This paper considers but challenges three such arguments, before defending a fourth possibility. Rejected are Peter Singer’s suggestion that interference will lead to more harm than (...) good, Sue Donaldson and Will Kymlicka’s suggestion that respect for nonhuman sovereignty necessitates non-interference in normal circumstances, and Alasdair Cochrane’s solution based on the claim that predators cannot survive without killing prey. The possibility defended builds upon Tom Regan’s suggestion that predators, as moral patients but not moral agents, cannot violate the rights of their prey, and so the rights of the prey, while they do exist, do not call for intervention. This idea is developed by a consideration of how moral agents can be more or less responsible for a given event, and defended against criticisms offered by thinkers including Alasdair Cochrane and Dale Jamieson. (shrink)

Holmes Rolston has defended certain forms of hunting and meat eating when these activities are seen as natural participation in the food chains in which we evolved. Ned Hettinger has suggested that some of Rolston’s principles that govern our interactions with plants and animals might appear to be inconsistent with Rolston’s defense of these activities. Hettinger attempts to show that they are not. We argue that Rolston’s principles are not consistent with hunting, given Hettinger’s modifications. In his defense of Rolston, (...) Hettinger has challenged animal welfare ethicists to show that they can value animal predation while consistently condemning human hunting. We answer that hunting and meat eating by humans are “cultural” rather than “natural” activities. (shrink)

Without modification, Rolston’s environmental ethics is biased in favor of plants, since he gives them stronger protection than animals. Rolston can avoid this bias by extending his principle protecting plants (the principle of the nonloss of goods) to human interactions with animals. Were he to do so, however, he would risk undermining his acceptance of meat eating and certain types of hunting. I argue,nevertheless, that meat eating and hunting, properly conceived, are compatible with this extended ethics. As the quintessential natural (...) process, carnivorous predation is rightfully valued and respected by such environmentalists as Rolston. Because the condemnation of human participation in predation by animal activists suggests a hatred of nature, the challenge for Rolston’s animal activist critics is to show that one can properly appreciate natural predation while consistently and plausibly objecting to human participation in it. (shrink)

The tethering of Indigenous peoples to animality has long been a central mechanism of settler colonialism. Focusing on North America from the seventeenth century to the pres­ent, this essay argues that Indigenous animalization stems from the settler imposition onto Native Americans of dualistic notions of human/animal difference, coupled with the settler view that full humanity hinges on the proper cultivation of land. To further illustrate these claims, we attend to how Native Americans have been and continue to be animalized as (...) both predators and pests, and show how these modes of animalization have and continue to provide settlers motive and justification for the elimination of Native peoples and the extractive domination of Native lands. (shrink)

Diffusion plays an essential role in the distribution of predator and prey. We mainly research the diffusion network’s effect on the predator-prey model through bifurcation. First, it is found that the link probability and diffusion parameter can cause Turing instability in the network-organized predator-prey model. Then, the Turing stability region is obtained according to the sufficient condition of Turing instability and the eigenvalues’ distribution. Finally, the biological mechanism is explained through our theoretical results, which are also illustrated by numerical simulation.

A variety of ethical objections have been raised against the military employment of uninhabited aerial vehicles (UAVs, drones). Some of these objections are technological concerns over UAVs abilities’ to function on par with their inhabited counterparts. This paper sets such concerns aside and instead focuses on supposed objections to the use of UAVs in principle. I examine several such objections currently on offer and show them all to be wanting. Indeed, I argue that we have a duty to protect an (...) agent engaged in a justified act from harm to the greatest extent possible, so long as that protection does not interfere with the agent's ability to act justly. UAVs afford precisely such protection. Therefore, we are obligated to employ UAV weapon systems if it can be shown that their use does not significantly reduce a warfighter's operational capability. Of course, if a given military action is unjustified to begin with, then carrying out that act via UAVs is wrong, just as it would be with any weapon. But the point of this paper is to show that there is nothing wrong in principle with using a UAV and that, other things being equal, using such technology is, in fact, obligatory. (shrink)

Animals suffer harms not only in human captivity but in the wild as well. Some of these latter harms are due to humans, but many of them are not. Consider, for example, the harms of predation, i.e. of being hunted, killed, and eaten by other animals. Should we intervene in nature to prevent these harms? In this article, I consider two possible ways in which we might do so: (1) by herbivorising predators (i.e. genetically modify them so that their (...) offspring gradually evolve into herbivores) and (2) by painlessly killing predators. I argue that, among these options, painlessly killing predators would be preferable to herbivorising them. I then argue that painlessly killing predators, despite its costs to predators, might under certain circumstances be justifiable. (shrink)

This paper makes the case for arms control regimes to govern the development and deployment of autonomous weapon systems and long range uninhabited aerial vehicles.

In this article, we argue that the phenomenon of predation is the source of several problems for Donaldson and Kymlicka's account of our duties towards wild and liminal animals. According to them, humans should adopt a general policy of non-intervention with respect to predatory behaviour involving wild and liminal animals. They justify this recommendation by appealing to the status of those animals as, respectively, members of sovereign communities and denizens of human-animal societies. Our goal is not to question their recommendation, (...) but to challenge the reasons given in its support. On the one hand, we argue that, insofar as wild animal communities are incapable of dealing with massive predation, they do not possess the competence required for sovereignty. Moreover, we argue that, even if we leave the issue of competence aside, attributing sovereignty rights to communities including both predators and preys may not be the best way to protect wild animals’ fundamental interests. On the other hand, we argue that there exist two important disanalogies between human denizens and liminal animals, which render Donaldson and Kymlicka's denizenship framework problematic. We suggest that the ultimate justification for a general policy of non-intervention lies in the significant risk of causing greater harm by acting otherwise, due to our limited knowledge and resources. (shrink)

We propose a mathematical model for a class of predator–prey systems more complex than the usual one, involving a commensalism effect consisting in an influence of the predator on the sustainability of the prey. This effect induces interesting new features, including bi-stability. The question of the possibility of reaching a certain attractor starting from initial conditions with a small population of predators, which presents an interest from the vewpoint of the onset of the predator in evolution, is addressed. We (...) propose two possibilities: the classical one involving adapted conditions in the far past and a new one using biodiversity, specifically the presence of another predator which operates as a starter, being displaced in the sequel. (shrink)

A new formulation of the cusp catastrophe is used to model the fundamental biological functions of predation and reproduction. This new representation lies on the decomposition of the overall cusp potential in two component potentials individualising the conflicting pregnances. It results in a more accurate and less problematic description than the original proposition by R. Thom, mostly due to the use of parameters with strong physical and evocative power. For instance, it gives a very suggestive account for such biologically significant (...) processes as digestion and assimilation, or pregnancy and delivery. Two couples of parameters are used in the new representation of the cusp: one defines the exact shape of the conflicting attractors which symbolises genetic coding, the other controls the deformation of -and interaction between- the two attractors and represent hormonal effects. This new description strikingly echoes Heidegger's philosophical thought on ontological difference, by giving a representation of the distinct concepts of entity and Being. It thus precludes a previous criticism concerning the impossibility for catastrophic models to depict the entity level. Such a type of representation might be useful in translating syntactical-semantic models of catastrophe theory into computer language. (shrink)

A growing number of studies have found that large brains may help animals survive by avoiding predation. These studies provide an alternative explanation for existing correlative evidence for one of the dominant hypotheses regarding the evolution of brain size in animals, the social brain hypothesis (SBH). The SBH proposes that social complexity is a major evolutionary driver of large brains. However, if predation both directly selects for large brains and higher levels of sociality, correlations between sociality and brain size may (...) be spurious. We argue that tests of the SBH should take direct effects of predation into account, either by explicitly including them in comparative analyses or by pin‐pointing the brain‐behavior‐fitness pathway through which the SBH operates. Existing data and theory on social behavior can then be used to identify precise candidate mechanisms and formulate new testable predictions. (shrink)

According to Martha Nussbaum, treating animals justly is a matter of guaranteeing each individual those capabilities up to a minimum threshold that are essential for flourishing as a member of a particular species. Nussbaum’s basic theoretical framework is acceptable; however, a capability which Nussbaum thinks is not essential for the flourishing, the oppor­tunity to kill as a part of exercising predatory instinct, may in fact be essential for predator flourishing. Nussbaum ought to be concerned with the possibility that this capability (...) is essential, since if it is, it is likely that in doing less harm than good we will also be treating some predators unjustly by denying them the opportunity to flourish. (shrink)

Testing of candidate biological control agents to estimate their likely field host ranges in the area of release has been part of weed biological control for several decades, with evolving techniques and goals. Similar efforts have been made less often for parasitoids and predators being introduced for arthropod biological control. Here, we review both techniques of host range testing and social objectives of such screening. We ask whether agents introduced for arthropod biological control should be subjected to host range (...) testing before release, and if so, are methods used for estimating host ranges of herbivorous arthropods appropriate, or are different approaches needed. Current examples in which host range testing has been employed for arthropod biological control are reviewed. We conclude with recommendations concerning guiding principles about use of host range testing. We recommend modest expansion of host range testing for arthropod biological control for projects on continents. We recommend more extensive testing for projects of introduction onto islands. We note that introductions to islands could provide opportunities to gain experience in use of host range estimation for this class of organisms and to conduct post release evaluations of host ranges. We urge caution in efforts to mandate host range testing but simultaneously recommend consultation between biological control workers and insect conservationists. (shrink)

Lors d’un safari, vous apercevez une lionne sur le point d’attaquer une gazelle. Or, vous êtes un partisan des droits des animaux. La gazelle a le droit de vivre, donc vous estimez devoir la sauver des griffes du félin. Toutefois, sauver la gazelle signifie violer le droit de la lionne de subvenir à ses besoins. Que vous sauviez la gazelle ou que vous laissiez la lionne la manger, il semble que vous soyez moralement condamnable. Certains estimeront que cette situation est (...) absurde et qu’elle est due à l’attribution de droits aux animaux. De ce fait, nous ne devrions pas leur en attribuer. Le présent article tente d’expliquer pourquoi nous ne devons pas intervenir dans les cas de prédation chez les animaux sauvages sans que cela ne mène à des conséquences absurdes en regard d’une théorie des droits des animaux sans que cela ne soit problématique pour le devoir d’assistance à personne en danger généralement accepté et tout en étant en accord avec, au moins, une théorie de la défense d’un tiers.During a safari, you see a lioness about to attack a gazelle. Now you are an advocate of animal rights. The gazelle has the right to live, so you feel you must save it from the feline’s claws. However, rescuing the gazelle will violate the right of the lioness to meet her needs. Rescuing the gazelle or let the lioness eat it, it seems that in any case you are wrong. Some will find this situation absurd and that it is due to the attribution of rights to animals. Thus, we should not attribute rights to them. This article attempts to show why we should not intervene in cases of predation in wildlife without leading to absurd consequences within an animal rights theory, without being problematic for the generally accepted duty to provide assistance and while being consistent with at least a theory of other-defense. (shrink)

In Just Fodder, Josh Milburn defends the view that sentient animals have negative rights. Since non-human animals are not moral agents, and can’t themselves violate anyone’s rights, wild predation is normally ethically unproblematic. However, Milburn argues, there are occasions when humans can become morally responsible for an animal’s predation. In cases like these, predation does violate the prey animal’s rights. The difficulty here lies in determining when a human is ‘sufficiently’ morally responsible for an animal’s predation for the predation to (...) count as a rights violation. In this paper, I pick out what I take to be the relevant criteria Milburn identifies for moral responsibility: creating increased predation risk, foreseeability of increased predation risk, intending predation to happen, having some kind of special responsibility for the predator, and having some kind of special relationship to the prey. I argue that, at least as applied by Milburn, these criteria can lead to a kind of moral over-extension, one that rules out most forms of wild animal rehabilitation, species reintroduction and rewilding. (shrink)

What are theoretical models and how do they contribute to a scientific understanding of reality? In this chapter, I will argue that models are akin to fictional stories in that they are human-made artifacts created through the imaginative activities of scientists. And I will suggest that the sort of imagination involved in modeling is make-believe and that this is constrained in three main ways which, together, enable knowledge of reality. I will conclude by addressing recent criticisms against the fiction view (...) of models and the relevance of scientific imagination in modeling put forward by Weisberg and Knuuttila. (shrink)

In presence of predator population, the prey population may significantly change their behavior. Fear for predator population enhances the survival probability of prey population, and it can greatly reduce the reproduction of prey population. In this study, we propose a predator-prey fishery model introducing the cost of fear into prey reproduction with Holling type-II functional response and prey-dependent harvesting and investigate the global dynamics of the proposed model. For the system without harvest, it is shown that the level of fear (...) may alter the stability of the positive equilibrium, and an expression of fear critical level is characterized. For the harvest system, the existence of the semitrivial order-1 periodic solution and positive order- q periodic solution is discussed by the construction of a Poincaré map on the phase set, and the threshold conditions are given, which can not only transform state-dependent harvesting into a cycle one but also provide a possibility to determine the harvest frequency. In addition, to ensure a certain robustness of the adopted harvest policy, the threshold condition for the stability of the order- q periodic solution is given. Meanwhile, to achieve a good economic profit, an optimization problem is formulated and the optimum harvest level is obtained. Mathematical findings have been validated in numerical simulation by MATLAB. Different effects of different harvest levels and different fear levels have been demonstrated by depicting figures in numerical simulation using MATLAB. (shrink)

Spatial predator-prey models have been studied by researchers for many years, because the exact distributions of the population can be well illustrated via pattern formation. In this paper, amplitude equations of a spatial Holling–Tanner predator-prey model are studied via multiple scale analysis. First, by amplitude equations, we obtain the corresponding intervals in which different kinds of patterns will be onset. Additionally, we get the conclusion that pattern transitions of the predator are induced by the increasing rate of conversion into predator (...) biomass. Specifically, pattern transitions of the predator between distinct Turing pattern structures vary in an orderly manner: from spotted patterns to stripe patterns, and finally to black-eye patterns. Moreover, it is discovered that pattern transitions of prey can be induced by cross-diffusion; that is, patterns of prey transmit from spotted patterns to stripe patterns and finally to a mixture of spot and stripe patterns. Meanwhile, it is found that both effects of cross-diffusion and interaction between the prey and predator can lead to the complicated phenomenon of dynamics in the system of biology. (shrink)

"The total amount of suffering per year in the natural world is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, others are running for their lives, whimpering with fear, others are being slowly devoured from within by rasping parasites, thousands of all k inds are dying of starvation, thirst and disease. It must be so." -/- —Richard Dawkins, River Out of Eden (1995).

In this work, our aim is to investigate the impact of a non-Kolmogorov predator-prey-subsidy model incorporating nonlinear prey refuge and the effect of fear with Holling type II functional response. The model arises from the study of a biological system involving arctic foxes, lemmings, and seal carcasses. The positivity and asymptotically uniform boundedness of the solutions of the system have been derived. Analytically, we have studied the criteria for the feasibility and stability of different equilibrium points. In addition, we have (...) derived sufficient conditions for the existence of local bifurcations of codimension 1. It is also observed that there is some time lag between the time of perceiving predator signals through vocal cues and the reduction of prey’s birth rate. So, we have analyzed the dynamical behaviour of the delayed predator-prey-subsidy model. Numerical computations have been performed using MATLAB to validate all the analytical findings. Numerically, it has been observed that the predator, prey, and subsidy can always exist at a nonzero subsidy input rate. But, at a high subsidy input rate, the prey population cannot persist and the predator population has a huge growth due to the availability of food sources. (shrink)

This paper establishes a model on the upstream and downstream relationship among private enterprises, provincial and local officials, and the central government in the real estate market using the population ecology theory of mutual relations among individual species from the perspective of business ecosystem. A dynamic model is introduced and the complex dynamical behaviors of such a predator-prey model are investigated by means of numerical simulation. The local stability conditions and complex dynamics are investigated, and the existence of chaos is (...) discussed in the sense of Marotto theorem; bifurcation diagrams, Lyapunov exponents, sensitivity analysis for initial values, and time history figure of the system are mapped out and discussed. This shows that there are two routes to complicated dynamics, one of which is the cascade of flip bifurcations resulting in periodic cycles, and the other one is Neimark-Sacker bifurcation which produces attractive invariant closed curves. We arrive at conclusions that the phenomenon of chaos is harmful to private enterprises, and unstable behavior is often unfavorable. Thus, linear feedback control is applied to drive the model to a stable state when the system exhibits chaotic behaviors, achieving the goal of eliminating the negative effects to a large extent. (shrink)

Human–wildlife conflicts involving protected predators are a major social and environmental problem worldwide. A critical aspect in such conflicts is the role of state institutions regarding predators’ conservation, and how this is construed by affected local populations. These interpretations are frequently embodied in conspiratorial rumours, sharing some common traits related to wild and domestic categories, spatial ordering and power relations. In southern Chile, a one-year, multi-sited ethnographic study of human–animal relations in and adjacent to protected areas was undertaken, (...) foregrounding conspiratorial rumours concerning protected predators. Through an analysis of this study and related international cases, this article argues that the uncritical dismissal of rumours and the categories used to interpret such conflicts have detrimental impacts on the conservation of wild predators. Such rumours should be understood as significant comment devices within human–animal relations and the power dynamics that frame human groups affected by them. (shrink)

In this paper, we propose a time-delayed predator-prey model with Holling-type II functional response, which incorporates the gestation period and the cost of fear into prey reproduction. The dynamical behavior of this system is both analytically and numerically investigated from the viewpoint of stability, permanence, and bifurcation. We found that there are stability switches, and Hopf bifurcations occur when the delay τ passes through a sequence of critical values. The explicit formulae which determine the direction, stability, and other properties of (...) the bifurcating periodic solutions are given by using the normal form theory and center manifold theorem. We perform extensive numerical simulations to explore the impact of some important parameters on the dynamics of the system. Numerical simulations show that high levels of fear have a stabilizing effect while relatively low levels of fear have a destabilizing effect on the predator-prey interactions which lead to limit-cycle oscillations. We also found that the model with or without a delay-dependent factor can have a significantly different dynamics. Thus, ignoring the delay or not including the delay-dependent factor might result in inaccurate modelling predictions. (shrink)

As part of a cluster of articles on religious exopraxis, within a larger symposium on xenophilia, this essay protests against the optimistic casting of exopraxis as a sign of fluidity, porosity, and openness. It argues instead that the pragmatic capacity to navigate alien practices and spaces of devotion can also be predatory. There are cases in which exopraxis amounts to an act of predation on what makes a religion to which one does not belong successful, and there are cases in (...) which it amounts to an act of appropriation, for one’s own purposes, of a sacred place belonging to another religion. This essay details examples found in Cape Verde, whose creole society developed from the admixture of its Portuguese settlers and its formerly enslaved African population. In the late 1990s and early 2000s, Cape Verde, like many other countries in the “global South,” emerged as a scene of fierce competition between campaigns of evangelization visited on the country from Europe, the United States, Africa, and Brazil. Most of the evangelists have been Christian, but since 2010, ascetic strains of Islam have also entered the local religious field. These emergent contexts are generating unprecedented forms of predatory exopraxis that this article details and evaluates. (shrink)

In this paper I propose a reinforcement learning model for a predator preying upon two types of prey, the unpalatable (noxious) models, and the palatable mimics. The latter type of prey resembles the models in appearance so as to derive some protection from the predator who must avoid the unpalatable models. Essentially the predator is treated as a learning automaton adopting a simple reinforcement learning strategy in order to increase its consumption of palatable prey and reduce the consumption of unpalatable (...) ones. The populations of both mimics and models are assumed to grow logistically. (shrink)

RésuméNotre propos est de réunir quelques réflexions de Pascal Quignard sur le récit afin d’en dégager les coordonnées ou les prémisses d’une théorie narrative chez cet écrivain qui, n’étant pas un théoricien, est sans doute quelqu’un qui fait œuvre de pensée. Notre hypothèse est que, situées dans le cadre d’une épistémologie naturaliste et d’un récit anthropogénétique au sein duquel la prédation joue un rôle majeur, en particulier celui de condition de possibilité de la narration, les spéculations de Quignard s’élaborent sur (...) fond de la théorie sémio-narrative laquelle subit ainsi une reformulation. Nous soutenons que la réinterprétation quignardienne fait partie des théories, comme celles de Petitot et de Thom, qui proposent une solution morphogénétique au problème de la conversion (de la substance sémique en forme narrative) tel qu’il se présente chez Greimas. Au sein de cette convergence avec le structuralisme naturaliste et morphodynamique, la spécificité de Quignard réside dans la configuration de la conversion comme capture. Cette figure dynamique devient alors un opérateur de narrativité différent des modèles logiques (carré sémiotique) ou topologiques (catastrophes) qui formalisent rationnellement la conversion. Elle est au cœur de la pensée de l’écrivain sur le phénomène narratif. (shrink)

Quantum frameworks for modeling competitive ecological systems and self-organizing structures have been investigated under multiple perspectives yielded by quantum mechanics. These comprise the description of the phase-space prey–predator competition dynamics in the framework of the Weyl–Wigner quantum mechanics. In this case, from the classical dynamics described by the Lotka–Volterra (LV) Hamiltonian, quantum states convoluted by statistical gaussian ensembles can be analytically evaluated. Quantum modifications on the patterns of equilibrium and stability of the prey–predator dynamics can then be identified. These include (...) quantum distortions over the equilibrium point drivers of the LV dynamics which are quantified through the Wigner current fluxes obtained from an onset Hamiltonian background. In addition, for gaussian ensembles highly localized around the equilibrium point, stability properties are shown to be affected by emergent topological quantum domains which, in some cases, could lead either to extinction and revival scenarios or to the perpetual coexistence of both prey and predator agents identified as quantum observables in microscopic systems. Conclusively, quantum and gaussian statistical driving parameters are shown to affect the stability criteria and the time evolution pattern for such microbiological-like communities. (shrink)