The diversity in colour patterns on butterfly wings provides great potential for understanding how developmental mechanisms may be modulated in the evolution of adaptive traits. In particular, we discuss concentric eyespot patterns, which have been shown by surgical experiments to be formed in response to signals from a central focus. Seasonal polyphenism shows how alternate phenotypes can develop through environmental sensitivity mediated by ecdysteroid hormones, whereas artificial selection and single gene mutants demonstrate genetic variation influencing the number, shape, size, (...) position, and colour composition of the eyespots. The expression patterns of the regulatory gene Distal-less reveal that these changes can arise at several different developmental stages, and the phenotypes indicate that some forms of changed pattern may occur much more readily than others. Further study of the genes, of the developmental mechanisms, and of the functions of the patterns will provide novel insights about the evolution of morphological diversity. BioEssays 21:391–401, 1999. © 1999 John Wiley & Sons, Inc. (shrink)

Zhuangzi chooses a butterfly as a metaphor for transformation, a sighted creature whose inherent nature contains, and symbolizes, the potential for transformation from a less valued state to a more valued state. If transformation is not to be valued; if, according to a recent article by Jung Lee, 'there is no implication that it is either possible or desirable for the living to awake from their dream', why not tell a story of a mole awakening from a dream? This (...) would be a more perfect story. There would be no point of a mole awakening since (setting aside tactile, olfactory, auditory and taste sensations for the purpose of the example), there is no way to distinguish between the world of the mole's imagination and the real world that is forever unavailable to a mole. In addition, Zhuangzi relates the story of the coming of a great sage in which it is clearly stated that 'Only at the ultimate awakening shall we know that this is the ultimate dream'. Such textual evidence both from the choice of metaphors and evidential passages indicates that the message of the Zhuangzi is not epistemological relativity, but one of transformation from a state of intellectual blindness to a state of true understanding. (shrink)

This paper integrates genetical studies of variation in the wing patterns of Lepidoptera with experimental investigations of developmental mechanisms. Research on the tropical butterfly,Bicyclus anynana, is described. This work includes artificial selection of lines with different patterns of wing eyespots followed by grafting experiments on the lines to examine the phenotypic and genetic differences in terms of developmental mechanisms. The results are used to show how constraints on the evolution of this wing pattern may be related to the developmental (...) organisation. The eyespot pattrn can be envisaged as a set of developmental homologues; a common developmental mechanism is associated with a quantitative genetic system involving high genetic correlations. However, individual genes which influence only subsets of the eyespots, thus uncoupling the interdependence of the eyespots, may be important in evolutionary change. The postulated evolutionary constraints are illustrated with respect to differences in wing pattern found among other species ofBicyclus. (shrink)

In this paper, we present two proofs of the reciprocal butterfly theorem. The statement of the butterfly theorem is: Let us consider a chord PQ of midpoint M in the circle Ω(O). Through M, two other chords AB and CD are drawn, such that A and C are on the same side of PQ. We denote by X and U the intersection of AD respectively CB with PQ. Consequently, XM = YM. For the proof of this theorem, see (...) [1]. The reciprocal of the butterfly theorem has the following statement: In the circle Ω(O), let us consider the chords PQ, AB and CD which are concurrent in the point M≠O, such as the points A and C are on the same side of the line PQ. Let X and Y respectively be the intersections of the chord PQ with AD and BC respectively. If XM = YM, then M is the middle of the chord PQ. (shrink)

The diversity in colour patterns on butterfly wings provides great potential for understanding how developmental mechanisms may be modulated in the evolution of adaptive traits. In particular, we discuss concentric eyespot patterns, which have been shown by surgical experiments to be formed in response to signals from a central focus. Seasonal polyphenism shows how alternate phenotypes can develop through environmental sensitivity mediated by ecdysteroid hormones, whereas artificial selection and single gene mutants demonstrate genetic variation influencing the number, shape, size, (...) position, and colour composition of the eyespots. The expression patterns of the regulatory gene Distal-less reveal that these changes can arise at several different developmental stages, and the phenotypes indicate that some forms of changed pattern may occur much more readily than others. Further study of the genes, of the developmental mechanisms, and of the functions of the patterns will provide novel insights about the evolution of morphological diversity. BioEssays 21:391–401, 1999. © 1999 John Wiley & Sons, Inc. (shrink)

Zhuangzi’s Butterfly Dream story can be read as a skeptical response to the Cartesian Cogito, ergo sum solution, for it presents I exist as fundamentally unprovable, on the grounds that the notion about “I” that it is guaranteed to refer to something existing, which Descartes seems to assume, is unwarranted. The modern anti-skepticism of Hilary Putnam employs a different strategy, which seeks to derive the existence of the world not from some “indubitable” truth such as the existence of myself (...) , but from the meaning of some particular assertion I make. In this paper, I argue, however, that Putnam’s argument fails to deliver on the promise of showing the self-refuting nature of the skeptical hypothesis, as it relies on a double use of “I”, a fallacy of equivocation, reflecting an unsolved tension between the argument’s general premise, which is rather Zhuangzian in spirit, and his unwitting adoption of that unwarranted notion about “I”. I try to show further that the skepticism in Zhuangzi’s Butterfly Dream not only can be used to refute the proofs of the existence of the empirical I , but also is effective against accounts concerning the existence of the transcendental I. (shrink)

The particular fascination of butterfly wings for developmental biologists (and others) lies in their spectacular array of colour patterns. The evolutionary and developmental relationships between these patterns have been analysed and we know something of the cell interactions involved in their formation(1). Now butterfly homologues of Drosophila wing‐patterning genes have been identified, and their expression patterns offer the first clues to the molecular mechanisms which specify wing colour patterns(2).

In lieu of an abstract, here is a brief excerpt of the content:Feminist Studies 44, no. 2. © 2018 by Feminist Studies, Inc. 379 Amy Bhatt The Butterfly Effect of Women’s Studies My entry into women’s studies began over two decades ago when I was an undergraduate at Emory University. I took Introduction to Women’s Studies in 1998, the same year that Feminist Studies published a formative issue on the evolution of women’s studies in the academy. I turned to (...) doctoral programs in women’s studies after graduation, all the while growing aware of the heated debates over the future (and the past) of the field, the challenges of crafting interdisciplinary graduate programs, the relationship between academic and activist feminisms, and the ramifications of institutionalization. By the time I entered the University of Washington’s PhD program in 2004, these conversations were further enlivened by the expansion of graduate degrees and certificates across the country and internationally. In 2017, I was promoted to associate professor after being hired as the first women’s studies tenure-track faculty member at my current institution, the University of Maryland, Baltimore County. Having been a part of three differently situated women’s studies programs/departments, I have experienced both the advantages that the field offers for engaged scholarship and teaching, but also the conceptual, resourcing, and workload problems that arise from doing interdisciplinary work. While not engaging the longer history of the scholarly and institutional evolution of women’s studies, my perspective as a relatively recently minted PhD student considers two areas: the promises and pitfalls of 380 Amy Bhatt graduate training (particularly in light of a constricted academic job market) and the impact of integrating women’s studies into the academy. Impossibilities and Promises In her introduction to a special forum on the paradoxes and challenges of women’s studies in graduate education in a 2003 issue of Feminist Studies (which took up the themes raised in the 1998 issue), Pamela Caughie points out that tension is at the core of women’s studies: “Interdisciplinary work depends on disciplinary knowledges; professional training may thwart social activism; theory cannot always be applied.”1 While women ’s studies programs have proliferated across higher education, even ardent feminist academics have levied forceful arguments against institutionalizing women’s studies as stand-alone units. In the same Feminist Studies article, Caughie argues that women’s studies should avoid “disciplining interdisciplinarity,” in part, because such attempts presume a (false) coherence in traditional disciplines that is oppositional to the interstitial nature of interdisciplinarity. While she advocates for graduate training in the field, she expresses concern that by hiring faculty in women’s studies and advocating for a shared research agenda, “we risk reproducing rather than critiquing disciplinary structures.”2 Likewise, in her introduction to Women’s Studies on the Edge, Joan Wallach Scott argues that, because of its formalization within the academy, women’s studies has lost its connection to activism and institutional critique.3 And perhaps most famously, Wendy Brown argues that the work of feminist, queer, critical race, and postcolonial theory ought to be returned to the disciplines, rather than remain within the separate, 1. Pamela L. Caughie, “Graduate Education in Women’s Studies: Paradoxes and Challenges (Introduction to Forum),” Feminist Studies 29, no. 2 (Summer 2003): 406. 2. Pamela L. Caughie, “Professional Identity Politics,” Feminist Studies 29, no. 2 (2003): 430. See also Robyn R. Warhol, “Nice Work, If You Can Get It— And If You Can’t? Building Women’s Studies Without Tenure Lines,” in Women’s Studies on Its Own, ed. Robyn Wiegman (Durham, NC: Duke University Press, 2002), 224–32. 3. Joan Wallach Scott, “Introduction: Feminism’s Critical Edge,” in Women’s Studies on the Edge, ed. Joan Wallach Scott (Durham, NC: Duke University Press, 2008), 1–16. Amy Bhatt 381 often marginalized, domain of women’s studies.4 Such critics caution against the formalization of and, in some cases, expansion of women’s studies across academe. On the other hand, advocates of women’s studies point out that the disciplines themselves are a taxonomy that reflects particular power/content /methodologicalinterventionsandthattheyarenotself-evidentspaces of knowledge production. They argue that formalization ought to be celebrated and that the debate over interdisciplinarity versus traditional disciplines has... (shrink)

The striking color patterns of butterflies and birds have long interested biologists. But how these animals see color is less well understood. Opsins are the protein components of the visual pigments of the eye. Color vision has evolved in butterflies through opsin gene duplications, through positive selection at individual opsin loci, and by the use of filtering pigments. By contrast, birds have retained the same opsin complement present in early-jawed vertebrates, and their visual system has diversified primarily through tuning of (...) the short-wavelength-sensitive photoreceptors, rather than by opsin duplication or the use of filtering elements. Butterflies and birds have evolved photoreceptors that might use some of the same amino acid sites for generating similar spectral phenotypes across 540 million years of evolution, when rhabdomeric and ciliary-type opsins radiated during the early Cambrian period. Considering the similarities between the two taxa, it is surprising that the eyes of birds are not more diverse. Additional taxonomic sampling of birds may help clarify this mystery. (shrink)

Peter Smith; XIV*—The Butterfly Effect, Proceedings of the Aristotelian Society, Volume 91, Issue 1, 1 June 1991, Pages 247–268, https://doi.org/10.1093/aristot.

ABSTRACTThe ‘dream of the butterfly,’ which seals the second chapter of the Zhuangzi, is often interpreted as undergirded by the bipolarity of dreaming and awakening or by the elusive interchange of identities between Zhuangzi and the butterfly, dreamer and dreamed. In this paper I argue that the underlying structure of the story may be better interpreted as exhibiting not two, but three stages of development, consistently echoing other tripartite parables in the Zhuangzi. In my reinterpretation I rely on (...) the phenomenology of dreams proposed by the Spanish philosopher María Zambrano, which distinguishes among three states: the primal dream, characterized by atemporality and wholeness; wakefulness, characterized by temporality and analytic thinking; and the creative dream, in which reality discloses itself as a meaningful, holistic unity. I suggest that Zhuangzi’s parable describes a similar self-transformative threefold process culminating in the joyous freedom of a shifting multifaceted subjectivity centered in the timeless pivot of the Dao. (shrink)

In this article, a chapter from a more general study, the butterfly is considered as an arresting `index', highlighting the evolution of children's culture and the relationships between science and literature. Comparing Furetière's knowledge of this insect, as set out in his Dictionnaire universel (1690), to its literary representations in Charles Perrault's or Fénelon's tales, helps to assess the context in which children's literature came to be written within the higher circles of the Versailles Court society. It also explains (...) some aspects of the `Querelle des Anciens et des Modernes'. Flying the flag for modernism, the butterfly stands in rhetorical opposition to the industrious bee or `zephyr' of the pastoral and idyll, as a sign of liberated childhood. An epilogue shows that butterflies in contemporary writings for children offer a postmodern illustration of the baroque trend that was initiated in children's literature at the end of the 17th century, and impart a special flavour to some of the most popular tales and picture-books. (shrink)

Commentary on research on butterflies' eyespots as a model in evolutionary developmental biology.

This is the third volume in a trilogy of fables by Steven Carter. Carter's butterflies are naive, worldly, sarcastic, philosophical, and very funny—in short, perfectly human!

If people never dreamed, would it make a difference to how they picture reality? Or themselves? Philosophers would certainly lose the most natural way of introducing skepticism. The Chinese Taoist, Chuang Tzu (369 B. C. - ?), dreamt he was a butterfly. When he awoke he wondered whether he was a man who dreamt he was butterfly or a butterfly now dreaming he is a man. Any experience can be explained as either a faithful representation of the (...) world or as a mere figment of a sleeper's imagination. (shrink)

In this paper we describe a test for Nijhout's hypothesis that the eyespot patterns on butterfly wings are the result of a threshold reaction of the epidermal cells to a concentration gradient of a diffusing degradable morphogen produced by focal cells at the centre of the future eyespot. The wings of the nymphalid butterfly, Bicyclus anynana, have a series of eyespots, each composed of a white pupil, a black disc and a gold outer ring. In earlier extirpation and (...) transplantation experiments it has been established that these eyespots are indeed organised around groups of signalling cells active during the first hours of pupal development. If these cells were to supply the positional information for eyespot formation in accordance with Nijhout's diffusion-degradation gradient model, then, when two foci are close together, the signals should sum, and this effect should be apparent in the detailed shape of the resulting pigment pattern. We give an equation for the form of the contours that would be obtained in this manner. We use this to test the morphogen gradient hypothesis on measurements of the outlines of fused eyespots obtained either by grafting focal cells close together, or by using a mutation that produces adjacent fused eyespots. The contours of the fused patterns were found to satisfy our equation, thus corroborating Nijhout's hypothesis to the extent possible with this particular type of experiment. (shrink)

With Peach Blossom Spring and other poetical works written by Tao Qian in the 5th century, there was born a vision of utopia that remains forever etched into the Chinese collective imaginary. Thirteen centuries later, Cao Xueqin drew inspiration from it when he gave form to the ‘Grandview Garden’, a universe with fundamentally female characteristics and one of the centres for the plot of The Story of the Stone, a masterpiece of Chinese romantic fiction also known as ‘Dream of the (...) Red Chamber/Mansions’. Reading the two works in parallel, in both the figurative and the literal sense, points up the message of the Daodejing that utopia cannot be planned or imposed. In fact it emerges from a spirit of openness, an attitude of patient waiting, listening with the ear of the other. This intuition leads to reflection on difference, based on Zhuangzi’s Butterfly Dream. (shrink)

In this article, I map current conceptions of cosmopolitanism and sketch distinctions between the concept and humanism and multiculturalism. The differences mirror what I take to be a central motif of cosmopolitanism: the capacity to fuse reflective openness to the new with reflective loyalty to the known. This motif invites a reconsideration of the meaning of culture as well as of the relations between home and the world.

An efficient intelligent fault diagnosis model was proposed in this paper to timely and accurately offer a dependable basis for identifying the rolling bearing condition in the actual production application. The model is mainly based on an improved butterfly optimizer algorithm- optimized kernel extreme learning machine model. Firstly, the roller bearing’s vibration signals in the four states that contain normal state, outer race failure, inner race failure, and rolling ball failure are decomposed into several intrinsic mode functions using the (...) complete ensemble empirical mode decomposition based on adaptive noise. Then, the amplitude energy entropies of IMFs are designated as the features of the rolling bearing. In order to eliminate redundant features, a random forest was used to receive the contributions of features to the accuracy of results, and subsets of features were set up by removing one feature in the descending order, using the classification accuracy of the SBOA-KELM model as the criterion to obtain the optimal feature subset. The salp swarm algorithm was introduced to BOA to improve optimization ability, obtain optimal KELM parameters, and avoid the BOA deteriorating into local optimization. Finally, an optimal SBOA-KELM model was constructed for the identification of rolling bearings. In the experiment, SBOA was validated against ten other competitive optimization algorithms on 30 IEEE CEC2017 benchmark functions. The experimental results validated that the SBOA was evident over existing algorithms for most function problems. SBOA-KELM employed for diagnosing the fault diagnosis of rolling bearings obtained improved classification performance and higher stability. Therefore, the proposed SBOA-KELM model can be effectively used to diagnose faults of rolling bearings. (shrink)

Applied to evaluative properties the supervenience thesis is customarily understood as expressing two intuitions: (i) the idea that there is some kind of dependence between the (supervenient) value of an object and some (or all) of the natural properties of the object; (ii) the idea that if you assert that x is valuable and if you agree that y is relevantly similar to x, with regard to natural properties, you must be prepared to assert that y too is valuable. It (...) is argued that the influential account of supervenience by R. M. Hare is problematic in that it only expresses the latter but not the former intuition. Two solutions to this problem are outlined, one of which ought to be endorsable by a prescriptivist such as Hare. (shrink)

[M]y attention was drawn to the flower garden of the grey matter, which contained cells with delicate and elegant forms, the mysterious butterflies of the soul, the beating of whose wings may someday... clarify the secret of mental life. Art can actually facilitate scientific understanding, even discovery. Art can be, and has been, the entryway to vision and the understanding of natural phenomena as demonstrated in its role in the development of neuron theory. While developing a course on current brain (...) research and learning and then projects for S.T.E.A.M. curriculum, I was repeatedly drawn to the work of Santiago Ramon y Cajal, whose life work provides an extraordinary example of the.. (shrink)

Nietzsche's early work on culture and tragedy proved influential on subsequent art and aesthetics; the relation between the Apollonian and Dionysian is central to this work. However, that relation is widely misunderstood, especially in its connection to Nietzsche's conceptions of Socrates and modernity. This paper contributes to the rectification of misunderstandings by demonstrating the proper way of understanding these relations. The analysis proceeds by way of a phenomenological treatment of the distinctive structure of the Apollonian. The analysis is reinforced by (...) showing how Nietzsche's later work on the nature of cultural production and change reflects and depends upon it. (shrink)

Applied to evaluative properties the supervenience thesis is customarily understood as expressing two intuitions: (i) the idea that there is some kind of dependence between the (supervenient) value of an object and some (or all) of the natural properties of the object; (ii) the idea that if you assert that x is valuable and if you agree that y is relevantly similar to x, with regard to natural properties, you must be prepared to assert that y too is valuable. It (...) is argued that the influential account of supervenience by R. M. Hare is problematic in that it only expresses the latter but not the former intuition. Two solutions to this problem are outlined, one of which ought to be endorsable by a prescriptivist such as Hare. (shrink)

Zhuang Zi has a seminal influence on Jacques Lacan. Seeing enables an observer to penetrate into the nature of the examined thing so that he will have a potential mastery over the observed object....

This article considers the sexual politics of animal evidence in the context of German sexology around 1920. In the 1910s, the German-Jewish geneticist Richard B. Goldschmidt conducted experiments on the moth Lymantria dispar, and discovered individuals that were no longer clearly identifiable as male or female. When he published an article tentatively arguing that his research on ‘intersex butterflies’ could be used to inform concurrent debates about human homosexuality, he triggered a flurry of responses from Berlin-based sexologists. In this article, (...) I examine how a number of well-known sexologists affiliated with Magnus Hirschfeld, his Scientific-Humanitarian Committee, and later his Institute of Sexology attempted to incorporate Goldschmidt’s experiments into their sexological work between 1917 and 1923. Intersex butterflies were used to discuss issues at the heart of German sexology: the legal debate about the criminalisation of homosexuality under paragraph 175; the scientific methodology of sexology, caught between psychiatric, biological, and sociological approaches to the study of sexual and gender diversity; and the status of sexology as natural science, able to contribute knowledge about the sexual Konstitution of the organism. This article thus shows that butterfly experiments function as important and politically charged evidence for a discussion at the heart of the sexological project of those involved in the founding of the Institute of Sexology: the question of the nature and naturalness of homosexuality and its political consequences. In doing so, this article makes a case for paying attention to non-human actors in the history of sexology. (shrink)

I argue that the main theme of the Zhuangzi is that of spiritual transformation. If there is no such theme in the Zhuangzi, it becomes an obscure text with relativistic viewpoints contradicting statements and stories designed to lead the reader to a state of spiritual transformation. I propose to reveal the coherence of the deep structure of the text by clearly dividing relativistic statements designed to break down fixed viewpoints from statements, anecdotes, paradoxes and metaphors designed to lead the reader (...) to a state of spiritual transformation. Without such an analysis, its profound stories such as the butterfly dream and the Great Sage dream will blatantly contradict each other and leave us bereft of the wisdom they presage. Unlike the great works of poetic and philosophic wisdom such as the Dao de Jing and the Symposium, the Zhuangzi will be reduced to a virtually unintelligible, lengthy, disjointed literary ditty, a potpourri of paradoxical puzzles, puns and parables, obscure philosophical conundrums, monstrous interlocutors and historical personages used as mouthpieces authoritatively arguing on behalf of viewpoints humorously opposite to what they historically held. (shrink)

Sceptical theism claims that we have vast ignorance about the realm of value and the connections, causal and modal, between goods and bads. This ignorance makes it reasonable for a theist to say that God has reasons beyond our ken for allowing the horrendous evils we observe. But if so, then does this not lead to moral paralysis when we need to prevent evils ourselves? For, for aught that we know, there are reasons beyond our ken for us to allow (...) the evils, and so we should not prevent them. This paralysis argument, however, shall be argued to rest on a confusion between probabilities and expected utilities. A connection between this paralysis argument and Lenman's1 discussion of the butterfly effect and chaos will be drawn, and the solution offered will apply in both cases. (shrink)

In this paper, I argue that a realist account of the modality of moral supervenience is superior to a non-cognitivist account. According to the recommended realist account, moral supervenience amounts to strong supervenience where the outer ‘necessary’ is conceptual and the inner metaphysical. It is argued that non-cognitivism faces a critical choice between weak and strong supervenience where both options are implausible on this view. However, non-cognitivism seems to have an important advantage: It can explain why the outer ‘necessary’ is (...) conceptual by reference to the function of moral language to influence behaviour. In the main part of the paper, I argue that realism is able to explain why ‘necessary’ in moral supervenience needs to be understood in the recommended manner by reference to the connection between moral properties and moral reasons. Moreover, I argue that the realist account has other attractive features. In contrast to non-cognitivism, it can unify the normative sphere by being generalizable to other normative notions. In addition, it can be part of an explanation of why moral language can have the function to influence behaviour. (shrink)

Arguments for the effectiveness, and even the indispensability, of mathematics in scientific explanation rely on the claim that mathematics is an effective or even a necessary component in successful scientific predictions and explanations. Well-known accounts of successful mathematical explanation in physical science appeals to scientists’ ability to solve equations directly in key domains. But there are spectacular physical theories, including general relativity and fluid dynamics, in which the equations of the theory cannot be solved directly in target domains, and yet (...) scientists and mathematicians do effective work there (McLarty 2023, Elder 2023). Building on extant accounts of structural scientific explanation (Bokulich 2011, Leng 2021), I argue that philosophical accounts of the role of equations in scientific explanation need not rely on scientists’ ability to solve equations independently of their understanding of the empirical or experimental context. For instance, the process of formulating solutions to equations can involve significant appeal to information about experimental contexts (Curiel 2010) or of physically similar systems (Sterrett 2023). Working from a close analysis of work in fluid mechanics by Martin Bazant and Keith Moffatt (2005), I propose an account of heuristic structural explanation in mathematics (Einstein 1921, Pincock 2021), which explains how physical explanations can be constructed even in domains where basic equations cannot be solved directly. (shrink)

Bernard d’Abrera’s concise atlas of the world’s butterflies is a beautifully produced book with the most stunning photographs of butterflies that I’ve ever seen. Though not intended as a coffee-table book, it could eminently serve that purpose. D’Abrera himself is a world-renowned butterfly and moth expert at the British Museum (Natural History) in London. Over the years he has produced books on the lepidoptera indigenous to various regions of the world. This book provides a synopsis of his life’s work.

Peter Smith; XIV*—The Butterfly Effect, Proceedings of the Aristotelian Society, Volume 91, Issue 1, 1 June 1991, Pages 247–268, https://doi.org/10.1093/aristot.

About a decade ago the concept of chaos burst upon scientific community as a new paradigm for viewing the certain of the workings of nature and the structures of mathematics. It embodied two key concepts: (1) that certain systems that are classified as "chaotic", while completely determined by initial conditions and the laws of physics, are nevertheless so unstable as to be inherently unpredictable; and (2) that the behavior of chaotic systems is not arbitrarily random, but instead shows regularities, repeating (...) patterns, and self-similarities. The new science of chaos thus staked out its territory in the middle ground between order and randomness, a ground that in the real world is occupied by systems ranging from energy levels in nuclei, to turbulence in plasmas, to the spread of gypsy moths, to weather patterns of Earth and Jupiter, to the stock and commodities markets. (shrink)

The greatest diversity of butterflies and their host plants occurs in tropical regions. Some groups of butterflies in the tropics exhibit monophagous feeding in the larval stage, exploiting only one family of plants; others are polyphagous, feeding on plants in two or more distinct families. The two major types of tropical habitats for butterflies, namely primary and secondary forests, offer very different evolutionary opportunities for the exploitation of plants as larval food. Butterflies are faced with the major logistical problem, as (...) are many other herbivorous insects, of depositing eggs on the correct plant for successful larval feeding. This paper, using the concepts of phenotype set and spatial patchiness of resources, attemps to make some predictions as to the optimal phenotypic systems for monophagous and polyphagous feeding in tropical butterflies, as related to the spatial patchiness of larval host plants in primary and secondary forests. In addition to the secondary compound chemistry of larval host plants as playing a role in the evolution of monophagy and polyphagy, the assumption is made that the spatial patchiness of host plants within and among different families also acts as a major factor in determining optimal ranges of phenotypes for different patterns of larval feeding. Owing to the high spatial patchiness of primary forest species of canopy trees and vines, it is predicted that butterflies exploiting these will be mostly polyphagous, whereas secondary forests having stable formations of fewer plant species and larger patches of these plants, will have mostly monophagous species. Forest understories may have both monophagous and polyphagous species, depending upon the layer of forest and the general type of understory (i.e. palmaceous or dicotyledonous). Field data on some groups of butterflies from tropical America support these predictions. Polyphagous butterflies are predicted to possess a genetic system of mixed morphs with a population being polymorphic as a whole; monophagous butterflies are predicted to have individuals all more or less similar genetically, and with a high amount of genic variation within individuals. Other forms of monophagy may evolve in species that are essentially monomorphic but with various mechanisms (physiological, developmental, behavioral) of phenotypic flexibility at the individual level. Although the environment is essentially coarse-grained for larvae since most are sedentary and polymorphism is an optimal adaptive strategy, the oviposition strategy of the adult must also be considered and some situations (i.e. forest canopy) have resources (host plants) distributed in a fine-grained fashion. Other forms of limited polyphagy may result from monomorphic genetic systems in which there is considerable phenotypic flexibility. (shrink)

The basic thesis that environmental values must spring from the economic relations of human societies is examined and it is suggested that although such connections are never absent, they do not account for the totality of values. Rather, they interact with other values in a kind of helical strand which is open-ended and self-organising. In such a context, 'sustainability', for example, becomes a rather time-limited idea. Our present ways of describing such evolution and interactions are also briefly examined.

This paper follows the tradition of treating Zhuangzi's Butterfly Dream episode as presenting a version of skepticism. However, unlike the prevalent interpretations within that tradition, it attempts to show that the skepticism conveyed in the episode is more radical than it has been conceived, such that the episode can be read as a skeptical response to Descartes' refutation of skepticism based on the _Cogito, ergo sum_ proof. The paper explains how the lack of commitment in Zhuangzi to the dubious (...) assumption about 'I' that it necessarily refers to something existing to which Descartes seems to uncritically adhere allows Zhuangzi to doubt what for Descartes is absolutely indubitable: _I exist_. (shrink)

Long before the phrases “climate change” and “butterfly effect” were incorporated into the mainstream literature, these phrases appeared in an appropriate context almost verbatim in the first Chapter of a book entitled “The Emigrant” published in the mid-nineteenth century by Sir Francis Bond Head. Head was Upper Canada’s sixth Lieutenant Governor under King George IV and Queen Victoria. Head claimed that forest wildfires were “changing the climate” of North America as manifested in a warming effect “on the thermometer”. In (...) that author’s account, these fires were provoked by First Nations to create fly-free zones meant to attract game that they could then hunt more readily. Head used language such as “swarms of little flies, strange as it may sound, are, and for many years have been, most materially altering the climate…” which is remarkably reminiscent of E. N. Lorenz’s “butterfly effect” of the theory of chaotic dynamical systems. The historical context and the rationales that may have led Head to use this contemporary environmental language in a proper context are briefly discussed. (shrink)