In this article I offer a new interpretation of Nietzsche’s doctrine of will to power by treating its relation to an often neglected conceptual distinction in Nietzsche’s philosophy: the distinction between (a) parasitism and (b) overflow. I show that Nietzsche treats (a) and (b) as two different ways of willing power, but with an important qualification: (a) is always a means to (b), which is the real aim of power. Because (b) is conceived of as the real aim of (...) power, it serves as Nietzsche’s standard for evaluating the degree of power attained by beings and their actions. The more that a being or activity attains (b), the greater is its power and rank according to Nietzsche. (shrink)

This essay considers biotrophic cyst and root‐knot nematodes in relation to their biology, host–parasite interactions and molecular genetics. These nematodes have to face the biological consequences of the physical constraints imposed by the soil environment in which they live while their hosts inhabit both above and below ground environments. The two groups of nematodes appear to have adopted radically different solutions to these problems with the result that one group is a host specialist and reproduces sexually while the other has (...) an enormous host range and reproduces by mitotic parthenogenesis. We consider what is known about the modes of parasitism used by these nematodes and how it relates to their host range, including the surprising finding that parasitism genes in both nematode groups have been recruited from bacteria. The nuclear and mitochondrial genomes of these two nematode groups are very different and we consider how these findings relate to the biology of the organisms. BioEssays 30:249–259, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

From the early modern period, Western epistemologists have often been concerned with a rigorous notion of epistemic justification, epitomized in the work of Descartes: properly held beliefs require insulation from extreme skepticism. To the degree that veridical cognitive states may be indistinguishable from non-veridical states, apparently veridical states cannot enjoy high-grade positive epistemic status. Therefore, a good believer begins from what are taken to be neutral, subjective experiences and reasons outward—hopefully identifying the kinds of appearances that properly link up to (...) the world and those that do not. Good beliefs, beliefs that are justified (warranted, etc.), are those that a believer has .. (shrink)

Interest in the intersection between bilingualism and cognitive control and accessibility to neuroimaging methods have resulted in numerous studies with a variety of interpretations of the bilingual cognitive advantage. Neurocomputational Emergentism (or Neuroemergentism for short) is a new framework for understanding this relationship between bilingualism and cognitive control. This framework considers Emergence, in which two small elements are recombined in an interactive manner, yielding a non-linear effect. Added to this is the notion that Emergence can be captured in neural systems (...) using computationally inspired models. This review poses that bilingualism and cognitive control, as examined through the Neuroemergentist framework, are interwoven through development and involve the non-linear growth of cognitive processing encompassing brain areas that combine and recombine, in symbiotic and parasitic ways, in order to handle more complex types of processing. The models that have sought to explain the neural substrates of bilingual cognitive differences will be discussed with a reinterpretation of the entire bilingual cognitive advantage within a Neuroemergentist framework incorporating its neural bases. It will conclude by discussing how this new Neuroemergentist approach alters our view of the effects of language experience on cognitive control. Avenues to move beyond the simple notion of a bilingual advantage or lack thereof will be proposed. (shrink)

Recent literature on skepticism has raised a nearly univocal voice in condemning skeptical argumentation on the grounds that such argumentation necessarily involves our adopting some nonordinary or unnatural perspective. Were this really so, then skeptical conclusions would not speak to us in the way in which skeptics think they do: We would be "insulated" from any such conclusions. I argue that skeptical argumentation need not rely on any nonordinary or unnatural standards. Rather, the skeptic's procedure is to offer a critique (...) from within. Having given my argument for this claim (which I call the 'continuity argument'), I consider and respond to two important objections. I conclude that the skeptic has a powerful meta-argument to be deployed in defending the legitimacy of his skeptical conclusions against the slings and arrows of (those I call) the half-true theorists. (shrink)

IN MANY RELIGIOUS CULTS AROUND THE world, ancestors Features are worshipped. And well they may be, for ancestors, not gods, hold..

The interest of F. Macfarlane Burnet in host–parasite interactions grew through the 1920s and 1930s, culminating in his book, Biological Aspects of Infectious Disease, often regarded as the founding text of disease ecology. Our knowledge of the influences on Burnet’s ecological thinking is still incomplete. Burnet later attributed much of his conceptual development to his reading of British theoretical biology, especially the work of Julian Huxley and Charles Elton, and regretted he did not study Theobald Smith’s Parasitism and Disease (...) until after he had formulated his ideas. Scholars also have adduced Burnet’s fascination with natural history and the clinical and public health demands on his research effort, among other influences. I want to consider here additional contributions to Burnet’s ecological thinking, focusing on his intellectual milieu, placing his research in a settler society with exceptional expertise in environmental studies and pest management. In part, an ‘‘ecological turn’’ in Australian science in the 1930s, derived to a degree from British colonial scientific investments, shaped Burnet’s conceptual development. This raises the question of whether we might characterize, in postcolonial fashion, disease ecology, and other studies of parasitism, as successful settler colonial or dominion science. (shrink)

This book explores how traditional theories of economic justice, both from the libertarian right and the egalitarian left, have failed to appreciate the objection against exploitative behavior that would be possible through the exercise of property rights. This failure also underlies the recent plea for a so-called unconditional basic income.

When people speak of the precipice on which we are sitting, they often appeal to some particular features of Russian culture, the Russian people, etc. I will not be discussing this point. I do not want to do so mainly because such discourses very often amount to no more than a peculiar type of racism.

Biological mimicry can be considered as having a double-layered structure: there is a layer of ecological relations between species and there is a layer of semiotic relations of the sign. The present article demonstrates the limitations of triadic models and typologies of mimicry, as well as their lack of correspondence to mimicry as it actually occurs in nature. It is argued that more dynamical semiotic tools are needed to describe mimicry in a theoretically coherent way that would at the same (...) time allow comparative approach to various mimicry cases. For this a five-stage model of analysis is proposed, which incorporates classical mimicry theory, Jakob von Uexküll’s Umwelt-theory, as well as semiotic and communication analysis. This research model can be expressed in the form of five questions: 1) What is the formal structure of mimicry system? 2) What are the perceptual and effectual correspondences between the participants of mimicry? 3) What are the characteristics of resemblances? 4) How is the mimicry system regulated in ontogenetic and evolutionary processes? 5) How is the mimicry system related to human cultural processes? As a practical example of this semiotic methodology, brood parasitism between the common cuckoo Cuculus canorus and his frequent host species is examined. (shrink)

Since the publication of J. A. Hobson’s (1858–1940) Imperialism: A Study in 1902, the text has been studied—even celebrated—as a liberal or proto-Marxist critique of modern empires. This reputation stands in some tension with the text itself, which defends various forms of imperial domination. While scholars have addressed this tension, they remain divided over how best to understand Hobson’s imperial commitments. Offering a new response to this debate, I argue that a key dimension of Imperialism has been overlooked—namely, Hobson’s conception (...) of humanity as stratified into a hierarchy of racial “souls.” This deeply committed view of human difference undergirded Hobson’s arguments about the moral and practical limits of Western imperial power. This article shows how Hobson articulated imperialism as the “parasitic” rule of whites over the nonwhite world—the solution to which was not the rejection of empire but the reform of white imperial power in accordance with his normative vision of global racial hierarchy. This recovery reveals the redemptive critique at the core of Imperialism and enables us to more readily grasp the text as a form of imperial apologetics. The article concludes with the suggestion that Hobson is better understood not as a liberal- or socialist-imperialist but as a proponent of racial capitalism on a global scale. (shrink)

Junior researchers can be abused and bullied by unscrupulous senior collaborators. This article describes the profile of a type of serial abuser, the White Bull, who uses his academic seniority to distort authorship credit and who disguises his parasitism with carefully premeditated deception. Further research into the personality traits of such perpetrators is warranted.

: Vasubandhu, an advocate of the idealist Yogācāra school of Buddhism, argues that the nonexistence of external objects can be inferred from the appearance of nonexistent things in perceptual illusion. The idealist view and the argument from illusion are criticized by proponents of the realist Nyāya school on the grounds that illusory experience is parasitic upon veridical experience. The parasitism objection successfully defeats Vasubandhu's argument from illusion but fails to decisively disprove the idealist view because it remains possible that (...) each illusory experience gets its content from a previous illusory experience in an infinite chain. (shrink)

On the Habermasial Argument of Parasitism. In this article it is argued that throughout Habermas' various treatments of the problem of 'simple imperatives' one can find a remaining contradiction: namely between identifying them on the one hand, for logical reasons, as the 'unsocial' acts they are . On the other hand, for fitting into sociological descriptions, Habermas tries to rearrange threats etc. within a so-called 'continuum' of all social actions. These difficulties can only be avoided by recognizing the entirely (...) unsocial character of certain ways of acting. This premiss is applied in an alternative analysis of perlocutions and simple imperatives. It leads to the conclusion that for the sake of logical consistency the possibility of ethical ignorance - the Kantian 'evil'? - must be brought into the categorical account of a grammatical analysis of practical statements. (shrink)

The species comprising the fungal endophyte genus “Epichloë ”are symbionts of cool season grasses. About half the species in this genus are strictly vertically transmitted, and evolutionary theory suggests that these species must be mutualists. Nevertheless, Faeth and Sullivan (e.g., 2003) have argued that such vertically transmitted endophytes are ’usually parasitic,’ and Müller and Krauss (2005) have argued that such vertically transmitted endophytes fall along a mutualism-parasitism continuum. These papers (and others) have caused confusion in the field. We used (...) a systematic review to show that close to half of the published papers in this field incorrectly categorize the interaction. Here, we develop the argument that advantages and disadvantages are not the same things as mutualism and parasitism and that experimental evidence must be interpreted in the context of theory. We argue that, “contra ”Faeth and Sullivan, it is highly unlikely that such strictly vertically transmitted endophytes can be parasites, and that, “contra ”Müller and Krauss, it is inappropriate to apply the continuum concept to strictly vertically transmitted endophytes. We develop a mathematical model to support and illustrate our arguments. We use the model to clarify that parasitism “requires ”some degree of horizontal transmission, and that while it is appropriate to use the continuum concept when referring to the genus as a whole, or to species that possess horizontal transmission, we argue that it is inappropriate to use the concept when referring to species that are strictly vertically transmitted. (shrink)

The metaphor of parasites or parasitism has dominated literary critical discourse since the 1970s, prominent examples being Michel Serres in France and J. Hillis Miller in America. In their writings the relationship between text and paratext, literature and criticism, is often likened to that between host and parasite, and can be therefore deconstructed. Their writings, along with those by Derrida, Barthes, and Thom, seem to be suggesting the possibility of a semiotics of parasitism. Unfortunately, none of these writers (...) has drawn enough on the biological foundation of parasitism. Curiously, even in biology, parasitism is already a metaphor through which the signified of an ecological phenomenon involving two organisms is expressed by the signifier of “[eating] food at another’s [side] table”. This paper will make some preliminary remarks on semiotics of parasitism, based on the notions of Umwelt (Jakob von Uexküll) and structural coupling (Maturana and Varela). It will look into the phenomenon of co-evolutionary process in community ecology. With reference to empirical history, the project will briefly surveythe literary and medical praxis of the 17th century England where large number of creative writings referred to the phenomenon of parasitism, which was deeply embedded in religious practice (e.g., the Eucharist) and political life (e.g., the courtier ecology in monarchy) of the times. Finally, it will touch upon the possible ‘parasitic’ relationship between language and biology. (shrink)

In this methods-building article, I show how attention to long-term continuities in female enslavement patterns helps us understand the emergence of the Black Atlantic. Slavery, I argue, is one form of human parasitism. I extend Orlando Patterson’s theory of human parasitism to examine the phenomenon of parasitic intertwining, wherein the forced labor of women became integral to broader social projects including household functioning, elite status maintenance, and population expansion. The thousand-year period between the fall of Rome and the (...) rise of the transatlantic slave trade was once described as a rupture in European slavery, with serfdom gradually supplanting slavery. The mass capture, transport, and enslavement of women, however, continued even as male slaves and ex-slaves gained significant status changes. The entrenchment of women in zonal slave trades generated both a potent cultural logic and a structural blueprint for the transatlantic trade. (shrink)

The article examines the concoction of religion and “science” contained in the revelation that substantiates a new religion: Raelianism, founded and led by the prophet Claude Vorilhon/Rael after having received a revelation in 1974. After a detailed examination both of Rael's prophetic message and his/the Raelians’ interpretative practices, an ad hoc model is presented to describe such concoction , and it is compared to other models. It is in particular claimed that Rael, while seemingly talking about “science,” is actually constructing (...) a science-fictional and even pseudoscientific narrative. The article finally raises the question whether the discussion of the science–religion interaction from the viewpoint of traditional religions can be considered to be immune to the usage of such rhetorical devices. (shrink)

Many marine invertebrates have the ability to combine tissues with conspecifics and form chimeras. This ability is usually accompanied by the presence of a polymorphic self/non-self recognition system that allows integration of closely related individuals, but blocks interactions between those more distantly related. The presence of a discriminatory allorecognition system suggests that there are costs and benefits to chimerism that are correlated to relatedness, but the nature of these costs and benefits is still poorly understood. Interestingly, allorecognition is found throughout (...) the animal kingdom, with examples in nearly all the multicellular phyla; however, the role of allorecognition in these different species is not always clear. In addition, the molecular mechanisms underlying allorecognition in different species are not related, suggesting a unique origin for each species. This brings up the question as to whether there is a universal need for self/non-self recognition processes among the metazoa, or if these systems evolve in response to different selective pressures. We are studying allorecognition and chimerism in the colonial ascidian, Botryllus schlosseri. Allorecognition takes place at the tips of the extracorporeal vasculature, and can result in a parabiosis, or a rejection reaction that blocks vascular fusion. Fusion has both hypothesized benefits as well as well-documented costs. This article will focus on characterizing the costs and benefits of fusion and chimerism in Botryllus, and put them into the broader context of the role of allorecognition in the metazoa. (shrink)

The present work is a contribution to the understanding of the sempiternal problem of the “burden of factor two” implied by sexual reproduction versus asexual one, as males are energy consumers not contributing to the production of offspring. We construct a deterministic mathematical model in population dynamics where a species enjoys both sexual and parthenogenetic capabilities of reproduction and lives on a limited resource. We then show how polygamy implies instability of a parthenogenetic population with a small number of sexually (...) born males. This instability implies evolution of the system towards an attractor involving both populations. We also exhibit the analogy with a parasite/host system. (shrink)

The consideration of ‘mutual benefits’ and partner cooperation have long been the accepted standpoint from which to draw inference about the onset, maintenance and breakdown of the coral‐algae endosymbiosis. In this paper, I review recent research into the climate‐induced breakdown of this important symbiosis (namely ‘coral bleaching’) that challenges the validity of this long‐standing belief. Indeed, I introduce a more parsimonious explanation, in which the coral host exerts a ‘controlled parasitism’ over its algal symbionts that is akin to an (...) enforced domestication arrangement. Far from being pathogenic, a range of well‐established cellular processes are reviewed that support the role of the coral host as an active ‘farmer’ of the energy‐rich photoassimilates from its captive symbionts. Importantly, this new paradigm reposes the deleterious bleaching response in terms of an envelope of environmental conditions in which the exploitative and captive measures of the coral host are severely restricted. The ramification of this new paradigm for developing management strategies that may assist the evolution of bleaching resistance in corals is discussed. (shrink)

In The Concept of Mind, Ryle's official position seems to be that mental acts cannot be intrinsically private. In The Concept of Mind as well as his later work on thinking, Ryle views thinking as an activity that terminates in a thought, which is a state of being prepared for a performance. Thinking is characterised by what Ryle calls intention-parasitism; for it is, insofar as its underlying motive is concerned, parasitic on the final performance which will take place later. (...) Ryle shows that acts of thinking, owing to their intention-parasitism, can be described in a tactical idiom, with reference to the final performance for which it was intended. However, this framework of intention-parasitism is not adequate to describe all instances of thinking in all their aspects, which therefore remain inextricably private. The task of this paper is to accommodate such privacy within the theoretical framework suggested in The Concept of Mind. (shrink)

I examine the tension between biopolitics and necropolitics through three themes that I have perceived and that are related to my life in Japan. First, I examine the transformation of hospitals and medical care, particularly for the elderly, through my experience of sharing the end of my mother’s life. Modern medicine has made great achievements in treating diseases that used to be fatal, but it has become institutionalized in the context of Big Pharma interests, with no insight into the natural (...) ageing and death of human beings. Second, I discuss how the ecological worldview on parasitism and symbiosis has been distorted by industrial logic, drawing on the work of my esteemed friend and parasitologist Professor Koichiro Fujita, who passed away in 2021. Finally, with regard to the Covid-19 pandemic, I would argue that it is not a sudden phenomenon triggered by a new virus, but in a sense a disaster that has been prepared for decades and must be seen as a war using bioengineering and epidemiology as weapons, rather than tanks and bombs. (shrink)

In response to Alan Holland's 'Darwin and the meaning in life' (Environmental Values 18: 503—518) I argue that there can be room in a Darwinian world for talk of value, in the sense of interpersonal reasons to promote, preserve or cherish some of the states of that world, or to be glad about those states. Darwinian theorists can recognise a range of intrinsically valuable states of affairs, from the pleasure or the happiness of creatures to their flourishing, and need not (...) discard axiology in general. The context of the passage criticised by Holland is explained to show that I was attempting to supply a vocabulary (such as 'reasons to be glad') usable by religious sceptics as well as believers, for comparing worlds with parasitism and predation and worlds without them; the shape of such comparisons is further delineated. Reasons for being tentative about trans-world comparisons are also supplied. (shrink)

Similar to “parasitism” and “mutualism”, the concept of commensualism defines a kind of biological association, i.e. the neutral interaction between two different species. This paper shows that “commensualism” was initially defined by the Belgian zoologist and parasitologist Pierre-Joseph van Beneden (1809–1894) as referring to biological associations between organic individuals from different species. According to van Beneden, one individual derives biological advantages from this kind of association, whereas the other one remains neutral, i.e. does not receive any biological loss or (...) gain. Tracing the further history of the concept, the paper demonstrates that, while “commensalism” was initially created and used in zoology, it was taken up in other biological disciplines shortly afterward, such as botany and the emerging field of ecology. However, the experimental demonstration of the phenomenon of commensualism remained difficult. This, in turn, contributed to the nomadic existence of this concept in the life sciences of the twentieth century. (shrink)

This article begins by exploring a lost topic in the philosophy of science:the properties of the relations evidence confirming h confirmsh'' and, more generally, evidence confirming each ofh1, h2, ..., hm confirms at least one of h1, h2,ldots;, hn''.The Bayesian understanding of confirmation as positive evidential relevanceis employed throughout. The resulting formal system is, to say the least, oddlybehaved. Some aspects of this odd behaviour the system has in common withsome of the non-classical logics developed in the twentieth century. Oneaspect (...) – its ``parasitism'''' on classical logic – it does not, and it is this featurethat makes the system an interesting focus for discussion of questions in thephilosophy of logic. We gain some purchase on an answer to a recently prominentquestion, namely, what is a logical system? More exactly, we ask whether satisfaction of formal constraints is sufficient for a relation to be considered a (logical) consequence relation. The question whether confirmation transfer yields a logical system is answered in the negative, despite confirmation transfer having the standard properties of a consequence relation, on the grounds that validity of sequents in the system is not determined by the meanings of the connectives that occur in formulas. Developing the system in a different direction, we find it bears on the project of ``proof-theoretic semantics'''': conferring meaning on connectives by means of introduction (and possibly elimination) rules is not an autonomous activity, rather it presupposes a prior, non-formal,notion of consequence. Some historical ramifications are alsoaddressed briefly. (shrink)

Most anyone interested in such topics as creation mythology, Jungian theory, or the idea of "secret teachings" in ancient Judaism and Christianity has found "gnosticism" compelling. Yet the term "gnosticism," which often connotes a single rebellious movement against the prevailing religions of late antiquity, gives the false impression of a monolithic religious phenomenon. Here Michael Williams challenges the validity of the widely invoked category of ancient "gnosticism" and the ways it has been described. Presenting such famous writings and movements as (...) the Apocryphon of John and Valentinian Christianity, Williams uncovers the similarities and differences among some major traditions widely categorized as gnostic. He provides an eloquent, systematic argument for a more accurate way to discuss these interpretive approaches.The modern construct "gnosticism" is not justified by any ancient self-definition, and many of the most commonly cited religious features that supposedly define gnosticism phenomenologically turn out to be questionable. Exploring the sample sets of "gnostic" teachings, Williams refutes generalizations concerning asceticism and libertinism, attitudes toward the body and the created world, and alleged features of protest, parasitism, and elitism. He sketches a fresh model for understanding ancient innovations on more "mainstream" Judaism and Christianity, a model that is informed by modern research on dynamics in new religious movements and is freed from the false stereotypes from which the category "gnosticism" has been constructed. (shrink)

Recent findings have provided evidence for the existence of non‐vertebrate acquired immunity. We survey these findings and propose that all living organisms must express both innate and acquired immunity. This is opposed to the paradigm that only vertebrates manifest the two forms of immune mechanism; other species are thought to use innate immunity alone. We suggest new definitions of innate and acquired immunity, based on whether immune recognition molecules are encoded in the inherited genome or are generated through somatic processes. (...) We reason that both forms of immunity are similarly ancient, and have co‐evolved in response to lifestyle, cost‐benefit tradeoffs and symbiosis versus parasitism. However, different species have evolved different immune solutions that are not necessarily genetically related, but serve a similar general function – allowing individuals to learn from their own immune experience; survival of species is contingent on the acquired immune experience of its individuals. (shrink)

This is the text of the 2022 Boyle Lecture. After some acknowledgements, it introduces the theological problem of the suffering of nonhuman creatures in the natural world as described by evolutionary science. It sets aside the neo-Cartesian objection that this suffering should not be considered real. The lecture then considers, and initially rejects, theodicies based on some form of fall event. An account is offered based on the premise that Darwinian evolution was the only way God could have given rise (...) to a biological world containing the sorts of values we observe. Although this remains the preferred basis for an evolutionary theodicy, consideration is finally given to the extent to which certain phenomena, such as parasitism, cancers, and viral infections, might be thought to exhibit a resistance to the divine will. The tentative suggestion is made that this resistance might derive from temptation by spiritual powers, thus incorporating into an overall only-way account an element of angelic fallenness. (shrink)

Exploitation is a fundamental element of the parental strategies of many species of birds. Cuckoos, for example, lay their eggs in the nest of other birds, who often unwittingly rear the alien nestlings as their own. Nest parasitism is an efficient reproductive strategy for cuckoos, who do not have to worry about building a nest, incubating their eggs, or feeding their nestlings. But not all hosts respond passively to such intrusions. In response to parasitic cowbirds, for example, robins have (...) evolved the ability to detect and selectively eject alien young from their nests. Human parenting strategies differ sharply from the strategies of cuckoos and robins. Unlike cuckoos, we are reluctant to allow our children to be raised by others. Unlike robins, we knowingly rear strange young. What makes human behavior toward children so different from that of cuckoos and robins? Humans seem to share a number of predispositions that facilitate successful adoptive relationships, and the desire to raise children seems to be pervasive among modern humans. Despite these commonalities, patterns of adoption transactions vary greatly among contemporary human societies. This paper considers the origins and causes of cross-cultural variation in human adoptive behavior from an evolutionary perspective. (shrink)

Three essays discuss aspects of Nietzsche's Thus Spake Zarathustra: the place of giftgiving in the portrayed economy, the meaning of feasting and parasitism, and references to the classical myth of Alcyone.

_Parasite_ presents the ethico-biological problem of parasitism in a metaphorical and artistic fashion. In this book, philosophers explore the film using sources such as the ancient satirist Lucian’s _De Parasito_, Nietzsche’s “the vengeance of the weak,” Dostoyevsky’s “Underground,” or Marxism, among others.

Many of the most virulent and problematic eukaryotic pathogens have evolved from photosynthetic ancestors, such as apicomplexans, which are responsible for a wide range of diseases including malaria and toxoplasmosis. The primary barrier to understanding the early stages of evolution of these parasites has been the difficulty in finding parasites with closely related free‐living lineages with which to make comparisons. Parasites found throughout the florideophyte red algal lineage, however, provide a unique and powerful model to investigate the genetic origins of (...) a parasitic lifestyle. This is because they share a recent common ancestor with an extant free‐living red algal species and parasitism has independently arisen over 100 times within this group. Here, we synthesize the relevant hypotheses with respect to how these parasites have proliferated. We also place red algal research in the context of recent developments in understanding the genome evolution of other eukaryotic photosynthesizers turned parasites. (shrink)

Ce travail présente quelques modèles mathématiques de répartition d'objets dans un ensemble de cases devant servir en particulier à l'analyse des résultats expérimentaux concernant la distribution des œufs d'un parasite dans un groupe de ses hôtes. On trouvera successivement une descriptions des situations concrêtes permettant l'utilisation de tels modèles, un rappel sur le matériel d'analyse combinatoire utilisé, cinq modèles relatifs aux différentes hypothèses de distribution au hasard, réception au hasard, reparasitisme à probabilités constante et variable et un exemple d'application aux (...) résultats de V.Labeyrie sur le parasitime d'Acrolepia assectella Z. par un ichneumonide Several mathematical models of distribution of objects among a set of boxes are presented in view of the analysis of experimental results obtained on the distribution of the eggs of a parasite among a group of its hosts.First, practical situations which allow the application of such models are described. In a second part, one recalls the elements of combinatorial analysis required by the following mathematical developments.Five models are then set up, each one being associated with the different hypothesis of: chance distribution, chance acceptance, re-parasitism with constant or variable probability Finally, an exemple of application to the results of V.Labeyrie on the parasitism ofAcrolepia assectella Z. by an ichneumon fly is given.Diese Arbeit soll einige mathematische Modelle von Verteilung der Gegenstände in eine Menge von Fächern geben, deren Zweck im Besonderen die Analyse von Versuchsergebnissen über die Eierlegung eines Parasiten in eine Gruppe seiner Wirte sein will.Es folgen: eine Beschreibung der konkreten Lagen, die eine Verwendung solcher Modelle ermöglichen, eine Aufzählung der benutzten Ergebnisse kombinatorischer Analysis, fünf Modelle, die folgenden verschiedenen Voraüssetzungen entsprechen: Zufallverteilung, Zufallaufnahme, wiederholter Parasitismus mit stetiger oder veränderlicher Wahrscheinlichkeit und ein Anwendungsbeispiel an Ergebnisse von V.Labeyrie über Parasitismus derAcrolepia assectella Z. durch einen Ichneumoniden—. (shrink)

La problemática adaptativa constituye un tema central para la teoría evolutiva. Uno de los principales cuestionamientos está dado por aquellos procesos que tradicionalmente se han considerado como adaptativos y que a la luz de la evidencia actual deben ser redefinidos. El estudio de la adaptación en el caso del parasitismo reviste especial importancia por sus aspectos epidemiológicos, ecológicos y evolutivos, además de su impacto en medicina evolutiva. El objetivo del presente trabajo es hacer un estudio de casos en cestodes con (...) el propósito de contrastar el grado de aplicación de la definición de adaptación propuesta por Dressino y discutir su viabilidad, limitaciones y alcances para el fenómeno parasitario. Se analizan numerosas definiciones y conceptos de adaptación y se advierte que muchas de ellas no cuentan con los requerimientos formales necesarios para su corroboración empírica. En base al análisis de casos de cestodes y teniendo en cuenta los conceptos de “interrelación de eslabones del ciclo biológico” y “potencialidad del fenómeno parasitario”, se propondrá el concepto de “concatenación de adaptaciones”. En razón de las particularidades adaptativas observadas en parásitos y de la inviabilidad de las definiciones de adaptación aplicadas a estos grupos, este nuevo concepto supone una multiplicidad de adaptaciones que se enlazan unas con otras y que la modificación de cualquiera de ellas tiene profundas consecuencias en las restantes.Adaptative issues constitute a central topic in evolutionary theory. One of the main questions concerns the processes that have traditionally been considered as adaptative and that should be redefined in the light of current evidence. The study of the adaptation in the case of parasitism was especially important for its epidemiological, ecological and evolutionary aspects, besides its impact on evolutionary medicine. The purpose of this work is a study of cases in cestodes in order to contrast the degree of application of the definition of adaptation proposed by Dressino and to discuss its feasibility, limitations and reaches for the phenomenon of parasites. A large number of definitions and concepts of adaptation is analyzed and it is observed that many of them do not fulfill the necessary formal requirements for their empiric corroboration. Based on the analysis of cases of cestodes and keeping in mind the concept of “interrelationship of links in the biological cycle” and “potential of the parasitic phenomenon”, we proposed the concept of “concatenation of adaptations”. Due to the adaptative particularities observed in parasites and the non feasibility of the definitions of adaptation applied to these groups, this new concept assumes that there is a multiplicity of adaptations that are linked to each other and that the modification of any one of them has profound consequences on the remaining adaptations. (shrink)

Carrion and dung odours of various flowers have traditionally been considered an adaptation for attracting the flies and beetles that pollinate them. While we accept the role of such odours in pollinator attraction, we propose that they may also have another, overlooked, anti‐herbivore defensive function. We suggest that such odours may deter mammalian herbivores, especially during the critical period of flowering. Carrion odour is a good predictor for two potential dangers to mammalian herbivores: (1) pathogenic microbes, (2) proximity of carnivores. (...) Similarly, dung odour predicts faeces‐contaminated habitats that present high risks of parasitism. These are two new types of repulsive olfactory aposematic mimicry by plants: (1) olfactory feigning of carcass (thanatosis), a well‐known behavioural defensive strategy in animals, (2) olfactory mimicry of faeces, which also has a defensive visual parallel in animals. (shrink)

A Psychologico-Ethical Study Of Human Parasitism, Its Effects, Causes And Cure; And A Philosophy Of Human Life And Aspirations Based Thereupon.