Glossina or tsetse flies, the vectors of sleeping sickness, form a unique group of insects with remarkable characteristics. They are viviparous with a slow rhythm of reproduction (one larva approximately every 10 days) determined by the regular ovulation of alternate ovaries. This unusual physiology enables the age of the females to be estimated by examining the ovaries.The resulting ovarian age structure of tsetse fly populations has been used to develop research into the demography of tsetse flies. Several (...) authors have proposed methods of estimating population growth rates from ovarian age distribution data. However, such methods are applicable only when the growth rate () is equal to 1 (i.e. the intrinsic rate of increase r is equal to 0). In fact, in this type of estimation, the adult survival rate a (or equivalently the mortality rate) cannot be dissociated from the growth rate. (shrink)

While across the animal kingdom offspring are born smaller than their parents, notable exceptions exist. Several dipteran species belonging to the Hippoboscoidea superfamily can produce offspring larger than themselves. In this essay, the blood‐feeding tsetse is focused on. It is suggested that the extreme reproductive strategy of this fly is enabled by feeding solely on highly nutritious blood, and producing larval offspring that are soft and malleable. This immense reproductive expenditure may have evolved to avoid competition with other biting (...) flies. Tsetse also transmit blood‐borne parasites that cause the fatal diseases called African trypanosomiases. It is discussed how tsetse life history and reproductive strategy profoundly influence the type of vector control interventions used to reduce fly populations. In closing, it is argued that the unusual life history of tsetse warrants their preservation in the areas where human and animal health is not threatened. (shrink)

Odor baited methods of controlling tsetse have received considerable attention as ecologically friendly ways for African farmers to reduce their levels of livestock trypanosomosis. Over the last decade, a number of tsetse control projects have been set up in East Africa using these methods. Although much has been written, few hard data are available regarding their ongoing success, problems, and sustainability. To evaluate the situation on the ground, the authors conducted a series of site visits to a number (...) of such tsetse control projects in Kenya. A comparison of these projects with others across the region identified the possible constraints to a wider uptake of these methods. Poor information, coupled with inappropriate research and development policies, were found to be the key constraints. These could be overcome with a farmer-based approach to control, with a better application of existing techniques, and with a greater role for veterinarians. Tsetse control needs to become demand rather than supply driven, if it is to bean important component of livestock disease control in Africa. (shrink)

Understanding ecological boundaries is recognized by ecologists as important for understanding ecosystem dynamics. All borders are borders in relation to some organism. However, much of the literature on habitat change ignores this basic ecological fact. In addition, borders are highly influenced by accidental or historical features of ecosystems, and researchers have in many cases defined them only in terms of convenience. Several viewpoints explored in this article reflect this skepticism about identifying ecosystems as real structured entities. I draw on Ghiselin’s (...) hypothesis that species are not natural kinds but individuals, to develop a relational approach to ecological boundaries. I argue that with regard to ecology a border is always a border for a specific organism, and is a border in a specific manner for that organism. I draw on studies of two species of tsetse fly found in the Mauhoun river basin in Burkina Faso to illustrate why this relational approach is important. This approach may also help identify weaknesses in conservation efforts that have not properly asked the question, “Boundary for what?”. (shrink)

In many developing countries people and livestock suffer from preventable or curable diseases, and their agriculture is vulnerable to natural disasters. A considerable amount of technical aid is directed at alleviating these problems using modern science and technology, and yet most of these efforts either fail or even leave peasants and pastoralists worse off than before. In this paper we consider some of the problems that arise in relation to development projects, focusing our attention on the savannah regions of Africa (...) and, in particular, on the control of tsetse flies, which are the vectors of the African trypanosomiases, called nagana in cattle and sleeping sickness in people. We present a detailed case study of a project designed to enable a Maasai community in Kenya to carry out their own tsetse fly control. We examine the complex set of relationships and power structures that mediate the actions of the players in development: scientists, local communities, governmental and nongovernmental institutions, and development agencies. The purpose of this paper is not to present solutions to complex and difficult problems but rather to raise questions that should provide a framework for a debate concerning the role of science and technology in the development process. (shrink)

There have, by now, been a number of thorough-going critiques of what has variously been called the ‘equality’, ‘equity’ or ‘liberal’ approach to understanding ‘the woman problem in technology’ by those who would prefer to focus on ‘the technology question in feminism’. Most of these critiques adopt deconstructivist techniques to expose the limitations of equality approaches, including, most centrally, their assumptions about the neutrality of technology and the limited nature of equality programmes designed simply to increase access for women to (...) that technology. However, the critiques themselves have so far failed to come up with convincing alternative interventionist strategies, either because the universalizing tendency of their theoretical perspective gives rise to interventions that fail to deal with the diverse and fragmented nature of women's experiences and needs, or because recognition of this diversity and fragmentation leaves very little common ground on which to build successful intervention strategies. This article addresses this dilemma in the context of computing and IT education and draws on empirical research on women's experiences of computing and IT in two different educational settings where issues of gender difference and equality were managed in very contrasting ways. It then offers some suggestions for how both a critical and constructivist discourse on technology might be made to coexist in educational programmes designed to promote gender equality. (shrink)

The uniqueness of Poland’s experience with the 2020 coronavirus lays in the interplay of two factors: the decisive governmental response to the pandemic, and the overlap of the pandemic with the country’s presidential election scheduled on May 10, 2020. The government’s fast reaction, combined with the citizens’ discipline, resulted in the suppression of the virus’s spread. The ratings of the current President Duda skyrocketed well above 50% needed for re-election in the first round. However, the expectation was that they would (...) be going down with the pandemic and lockdown fatigue. For almost two months, the government tried to organize the elections under the normal schedule while the opposition tried to block them. Finally, the opposition won, and the elections were rescheduled on June 28, with the President Duda’s ratings substantially lower. Nevertheless, in the runoff on July 11, Duda won. Our conclusion goes against the common opinion that electoral engineering is always one-sided. The reconstruction of the pre-electoral political maneuvers shows that many independent players were simultaneously involved in complex engineering, and that the final outcome was hard to predict until almost the very end. (shrink)

This paper is concerned with everyday data practices, considering how people record data produced through self-monitoring. The analysis unpacks the relationships between taking a measure, and making and reviewing records. The paper is based on an interview study with people who monitor their blood pressure and/or body mass index/weight. Animated by discussions of ‘data power’ which are, in part, predicated on the flow and aggregation of data, we aim to extend important work concerning the everyday constitution of digital data. In (...) the paper, we adopt and develop the idea of curation as a theory of attention. We introduce the idea of discerning work to characterise the skilful judgements people make about which readings they record, how readings are presented, and about the records they retain and those they discard. We suggest self-monitoring produces partial data, both in the sense that it embodies these judgements, and also because monitoring might be conducted intermittently. We also extend previous analyses by exploring the broad set of materials, digital and analogue, networked and not networked, involved in record keeping to consider the different ways these contributed to regulating attention to self-monitoring. By paying attention to which data is recorded and the occasions when data is not recorded, as well as the ways data is recorded, the research provides specificity to the different ways in which self-monitoring data may or may not flow or contribute to big data sets. We argue that ultimately our analysis contributes to nuancing our understanding of ‘data power’. (shrink)

Many western industrialized countries are currently suffering from a crisis in health human resources, one that involves a debate over the recruitment and licensing of foreign-trained doctors and nurses. The intense public policy interest in foreign-trained medical personnel, however, is not new. During the 1960s, western countries revised their immigration policies to focus on highly-trained professionals. During the following decade, hundreds of thousands of health care practitioners migrated from poorer jurisdictions to western industrialized countries to solve what were then deemed (...) to be national doctor and nursing 'shortages' in the developed world. Migration plummeted in the 1980s and 1990s only to re-emerge in the last decade as an important debate in global health care policy and ethics. This paper will examine the historical antecedents to this ethical debate. It will trace the early articulation of the idea of a 'brain drain', one that emerged from the loss of NHS doctors to other western jurisdictions in the 1950s and 1960s. Only over time did the discussion turn to the 'manpower' losses of 'third world countries', but the inability to track physician migration, amongst other variables, muted any concerted ethical debate. By contrast, the last decade's literature has witnessed a dramatically different ethical framework, informed by globalization, the rise of South Africa as a source donor country, and the ongoing catastrophe of the AIDS epidemic. Unlike the literature of the early 1970s, recent scholarship has focussed on a new framework of global ethics. (shrink)

This article explores how older adults negotiate and partially counter normative expectations of “health citizenship” that stress individual responsibility for maintaining health and preventing health problems. Based on interviews with 55 participants in Canada and the U.K. about what healthy living means to them in their everyday lives, we examine how the dominant discourse of personal responsibility in participants’ responses is counterpointed by a more muted, yet significant, alternative critical perspective on the relative roles and responsibilities of government and citizens (...) in making healthy living possible. Drawing on Hauser’s (1999) concept of vernacular rhetoric along with recent theories of environmental citizenship, we analyze how participants exercise their civic-political judgment by using a logic of dissociation to argue that what government says about the importance of healthy living is incompatible with what government does to support citizens’ abilities to eat healthily and live actively. By deploying this technique of argumentation to address structural-political-economic dimensions of healthy living, participants enact, in modest ways, an alternative, critical-collective mode of health citizenship that complicates and, at least partially, disrupts neoliberal constructions of the individually responsible, “good” health citizen. (shrink)

As the world’s population grows and urbanization continues, the global waste crisis is becoming more severe, especially in developing countries. Without proper waste management, they may encounter various environmental and health risks. Biological technologies are regarded as promising waste management and recycling approaches in developing countries due to their cost-effectiveness and capability to handle diverse waste categories. One prominent technology in this aspect is the vermicomposting of organic waste utilizing the black soldier fly larvae. Nevertheless, significant financial resources are still (...) necessary to advance and expand biological waste treatment, which requires the participation of businesses. By examining waste management companies listed on the Vietnamese stock market, we highlight two challenges that hinder the adoption and scaling of the waste treatment system using black soldier flies and potentially other biological technologies in Vietnam. Specifically, the business regards the environmental services they offer primarily as a means to generate profit rather than as a genuine commitment to environmental preservation, and the values of companies operating in the environmental sector, particularly in waste management, have been significantly undervalued by the Vietnamese investing public. Therefore, we advocate for societal shifts toward the eco-surplus culture and apply the semiconducting principle of monetary and environmental values exchange to address the problem. (shrink)

Focusing on the question of how to be in the world, ontological religion often comes in forms that look very little like our standard expectations for religious institutions. Intuitive, experiential, and often taking a mystical bent, this direct kind of religious practice nevertheless needs guideposts for its participants. The literature of fly fishing serves as one such guidepost, offering a forum for a kind of spiritual public consciousness that can be drawn upon at will by those who seek it. This (...) article explores the parallels between fly fishing, its literature, and the kinds of spiritual statements that are regularly found among religious practitioners who are most concerned with questions about how to live. I am arguing here that fly fishing literature forms an implicit repository for a religious form of consciousness and a religious way of being in the world. (shrink)

Toys to overcome time, distance, and gravity -- To fly like a bird, not float like a cloud -- Finding a place in the world -- A new continent -- A new age-old problem to solve -- The physics of miniature worlds -- Models of wings and models of the world -- A world made of facts.

Last year, I flew to two bioethics conferences, one in Europe and one in North America. These were good things to do, or so I thought. But I worry that flying and other activities are contributing to climate changes that will affect the health of vulnerable people, the life prospects of future generations, and the balance of the natural world. Thus, in this paper, I consider how I should respond. To begin, I describe briefly how climate change will impact human (...) health. Then I note how climate change raises issues about justice. But I focus on issues about moral responsibility and responsiveness. (shrink)

A portrait of Australian flying fox life in the Anthropocene illuminates startlingly familiar stories. These animals are participants in most of the major catastrophic events, as well as contestations about rescue, of contemporary life on Earth: warfare, man-made mass death, famine, urbanisation, emerging diseases, climate change, biosecurity, conservation, and local/international NGO aid. They are endangered, and are involved in all four of the major factors causing extinctions: habitat loss, overexploitation, introduced species, and extinction cascades. My account of flying foxes in (...) Australia rests on the understanding of species articulated both vigorously and eloquently by Donna Haraway : we and others are entangled in knots of species who are co-shaping each other in layers of reciprocating complexity. I seek to engage both the living, warm-blooded beings whose lives are threatened, and the excruciatingly dynamic deathscape that is surrounding them/us. Positioned, like much of life on Earth today, in zones of increasing conflict and terror, the lives and deaths of flying foxes tell us that in the Anthropocene there is no way out of entanglements within multispecies communities. Rather than seeking to erect more impenetrable barriers against others, relational ethics for living and dying in the Anthropocene urge us to assume ever greater mutuality and accountability as intradependent members of the suffering family of life on Earth. (shrink)

Written in the late 1950s at the height of popular fascination with UFO's, _Flying Saucers_ is the great psychologist's brilliantly prescient meditation on the phenomenon that gripped the world. A self-confessed sceptic in such matters, Jung was nevertheless intrigued, not so much by their reality or unreality, but by their psychic aspect. He saw flying saucers as a modern myth in the making, to be passed down the generations just as we have received such myths from our ancestors. In this (...) wonderful and enlightening book Jung sees UFO's as 'visionary rumours', the centre of a quasi-religious cult and carriers of our technological and salvationist fantasies. 40 years later, with entire religions based on the writings of science fiction authors, it is remarkable to see just how right he has proved to be. (shrink)

Last year I flew to two bioethics conferences, one in Europe and one in North America. I also flew to Taiwan to teach abroad for a year. These were good things to do, or so I thought. I contributed to educational events, learned more about bioethics, and visited with friends and colleagues. But I worry that flying and other activities in my life are contributing to climate changes that will affect the health of vulnerable people, the life prospects of future (...) generations, and the balance of the natural world.I sometimes imagine a dialogue with a young person, twenty years from now, when the climate crisis is much worse.What were you people in bioethics thinking? You flew to conferences all over the world, emitting .. (shrink)

This is a critical comment on Adamson and Benevich, published in issue 4/2 of the Journal of the American Philosophical Association. I raise two closely related objections. The first concerns the objective of the flying man: instead of the question of what the soul is, I argue that the argument is designed to answer the question of whether the soul exists independently of the body. The second objection concerns the expected result of the argument: instead of knowledge about the quiddity (...) of soul, I claim the argument yields knowledge about the soul's existence independently of the body. After the objections, I turn to the masked man fallacy, claiming that although the Adamson-Benevich interpretation does save the argument from the fallacy, this comes at the cost of plausibility. I then give a more modest interpretation that both avoids the fallacy and is plausible. The paper concludes with a remark about the metaphysical possibility of the flying man. (shrink)

Is this the crisis of culture we experience today, or should we consider it a victory, a glorious deconstruction of metaphysical culture? McLuhan’s prophetic vision about the historical phases of orality–literate culture–secondary orality can be interpreted as events of a Hegelian triad. The process should be about the alienation and withdrawal of the Mind: in literate culture the Mind took an objectified, outer and estranged form, that of metaphysical culture. Today, in the open, interactive media of Web 2 we can (...) take possession of the Mind again and free it from the rigid hierarchies. One should be eager to take part in such a universal reform, but somehow, it seems, there is a fly in the ointment. (shrink)

This chapter discusses the reception of Avicenna’s well-known “flying man” thought experiment in twelfth- and thirteenth-century Latin philosophy. The central claim is that the argumentative role of the thought experiment changed radically in the latter half of the thirteenth century. The earlier authors—Dominicus Gundissalinus, William of Auvergne, Peter of Spain, and John of la Rochelle—understood it as an ontological proof for the existence and/or the nature of the soul. By contrast, Matthew of Aquasparta and Vital du Four used the flying (...) man as an argument for the soul’s ability to be directly aware of itself. A detailed analysis of the views of these authors shows interesting philosophical differences between them and reveals how one of the crucial premises of the original thought experiment—namely that the flying man is unaware of his body—loses its importance due to the changes in the argumentative role that is assigned to it. The most radical example of a new way of understanding bodily self-awareness is Peter Olivi’s so-called ‘man before the creation.’. (shrink)

(1997). The fly in the ointment: A study of relativism in MacIntyre and Goodman as applied to innocence and guilt in Kafka's the trial. The European Legacy: Vol. 2, Fourth International Conference of the International Society for the Study of European Ideas, pp. 609-614.

We argue that the prudential benefits of long-distance leisure travel can justify such trips even though there are strong and important reasons against long-distance flying. This is because prudential benefits can render otherwise impermissible actions permissible, and because, according to dominant theories about wellbeing, long-distance leisure travel provides significant prudential benefits. However, this ‘wellbeing argument’ for long-distance leisure travel must be qualified in two ways. First, because travellers are epistemically privileged with respect to knowledge about what is good for them, (...) they must look critically at their own assessment of the prudential benefits of a trip. Second, the wellbeing argument is unlikely to support prudential arguments for long-distance leisure trips made by frequent flyers. (shrink)

This chapter discusses the reception of Avicenna’s well-known “flying man” thought experiment in twelfth- and thirteenth-century Latin philosophy. The central claim is that the argumentative role of the thought experiment changed radically in the latter half of the thirteenth century. The earlier authors—Dominicus Gundissalinus, William of Auvergne, Peter of Spain, and John of la Rochelle—understood it as an ontological proof for the existence and/or the nature of the soul. By contrast, Matthew of Aquasparta and Vital du Four used the flying (...) man as an argument for the soul’s ability to be directly aware of itself. A detailed analysis of the views of these authors shows interesting philosophical differences between them and reveals how one of the crucial premises of the original thought experiment—namely that the flying man is unaware of his body—loses its importance due to the changes in the argumentative role that is assigned to it. The most radical example of a new way of understanding bodily self-awareness is Peter Olivi’s so-called ‘man before the creation.’. (shrink)

Learn how to use breath, movement, sound, and stillness in a fresh and modern way to live an epic, Spiritually Fly life.

David Albert explains why we can typically influence the future but not the past by appealing to an initial low-entropy state of the universe. And he argues that in the rare cases where we can influence the past, we cannot use this influence to knowingly gain future rewards: so it does not constitute control. I introduce an important new case in which Albert's account implies we can not only influence the past but control it: a case where our actions in (...) the present are reliably correlated with several events in the present and past. To deal with such cases, we need to appeal to epistemic conditions on deliberation: being agents requires our decisions being epistemically undetermined at the time we make them. In a world with the past-hypothesis, this implies that deliberation will typically come prior to decision. Once deliberation in this direction is established, correlations towards the past cannot then be exploited for control. To explain why we cannot effectively control the past, we need to appeal to deliberation, whether as part of a defence of Albert's account, or used independently to explain the asymmetry of control. (shrink)

Jan Zwicky - Wittgenstein Flies a Kite: A Story of Models of Wings and Models of the World - Journal of the History of Philosophy 45:4 Journal of the History of Philosophy 45.4 670-671 Muse Search Journals This Journal Contents Reviewed by Jan Zwicky University of Victoria Susan G. Sterrett. Wittgenstein Flies a Kite: A Story of Models of Wings and Models of the World. New York: Pi Press, 2006. Pp. xxii + 329. Cloth, $26.95 Wittgenstein Flies a Kite focuses (...) on intellectual developments in philosophy, physics, aeronautics, and engineering in the years just prior to the First World War. Sterrett points out that certain thinkers were involved simultaneously in more than one of these fields, and argues for conceptual cross-pollination among them. In particular, she wishes to make a case for connections between the modeling of.. (shrink)

Hubris among CEOs is generally considered to be undesirable: researchers in finance and in management have documented its unwelcome effects and the media ascribe many corporate failings to CEO hubris. However, the literature fails to provide a precise definition of CEO hubris and is mostly silent on how to prevent it. We use work on hubris in the fields of mythology, psychology, and ethics to develop a framework defining CEO hubris. Our framework describes a set of beliefs and behaviors, both (...) psycho-pathological and unethical in nature, which characterize the problematic relationship of the hubris-infected CEO towards his or her own self, others and the world at large. We then demonstrate how the development of authentic leadership may contribute to preventing or attenuating hubris by addressing its psycho-pathological nature through the true self and meaningful relationships with others. In addition to its psycho-pathological dimension, CEO hubris also contains an ethical dimension. We therefore propose that the development of the virtue of reverence might contribute to the prevention or attenuation of CEO hubris, because reverence makes the individual aware of his or her place in the world order and membership of the community of humans. (shrink)

There is a remarkable trend in contemporary environmentalism that emphasizes ‘accepting responsibility’ for the natural world in contrast to outdated preservationist thinking that shirks such responsibility. This approach is often explained and justified by reference to the anthropocene: this fundamentally new epoch—defined by human domination—requires active human intervention to avert planetary catastrophe. However, in this paper, I suggest this rhetoric encourages a flight from history. This often jubilant, sometimes anxious, yearning for unprecedented human innovation and—ultimately—control in our new millennia mirrors (...) the Futurist movement that took off near the beginning of the last century. Despite the significant differences in the details of how academics have defended this twenty-first-century environmental outlook, they all represent the true flight from history; they too quickly jettison the ideas of historical environmentalists and so misunderstand the environmental values at the heart of preservation that are more salient than ever. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Bucky Flies, Almost!Govinda SrinivasanOne day Bucky the monkey saw birds high up in the sky. He was looking at the Harpy Eagle soaring beautifully in the sky. He wished he too could fly like that. He knew how to get to the top of the canopy, but then how to fly free in the sky? That was the great problem. Click for larger view View full resolution[End Page 109]Now (...) he looked at himself and said, “I don’t have any wings. But I do have a tail for balance.” He wagged his tail with joy. “Now how do I get wings?” He looked at the whole upper canopy. He saw some huge leaves of the teak tree. He took eight leaves, two for each limb. He tied the leaves to his arms and legs. Crossy-Cross. He felt panic and excitement. Bucky flapped his arms and leapt into the sky. Click for larger view View full resolution Click for larger view View full resolution[End Page 110]The birds looked at him from the sky. Bucky flew for a quarter of a minute and then... “Aaaaaaaaeeeh! Click for larger view View full resolutionEeeeeeeeeh! Oooooooh!” cried Bucky as he desperately caught hold of a branch and hung on to it. The branch creaked and broke. Bucky was much too heavy.[End Page 111] Click for larger view View full resolutionLucky Bucky. He fell through the canopy into the swamp. “SPLASH!” A Manatee took him back to the bank. Bucky said, “Thank you!” in a dizzy tone. He did not give up though. Click for larger view View full resolution[End Page 112]Next time he tried something different. He made friends with the Harpy Eagles. He asked four of them to carry him up in the sky and leave him high in the sky.Bucky then started flapping his leafy wings. The leaves tore away. “Aaaaah! Eeeeeh! Oooooh!” again. One of the Harpy Eagles was swift and it swooped down and held Bucky by his tail just as he was about to crash into the canopy. “Thank God!” said Bucky. “No, No, Thank you, Harpy,” Bucky corrected himself. Click for larger view View full resolution[End Page 113]Professor Beaver was watching, and so were all the students in his class. All the animals in the Amazon Rainforest saw Bucky. Then two Weaver birds came and told Bucky, “We can help you stitch big wings.” Then the beavers came and said, “We will help you build a big yet light frame for the wings.” They began working as a team. All kinds of spiders came and shared their super-strong silk threads. Click for larger view View full resolution[End Page 114]Soon the forest was humming with activity. Bucky got a pair of wings. Then he asked for advice from the birds. The Tawny Owl said, “You know, Bucky, why don’t you try to glide first. You can learn it from the Flying Squirrels.” Bucky said, “What a great idea! I can learn to fly from a fellow mammal.” Click for larger view View full resolution[End Page 115]Bucky went in search of the squirrels dragging his wings along. He searched all day, but the Flying Squirrels were not to be found. “Well, Bucky, Flying Squirrels are nocturnal. You will have to wait until dark,” said the Tawny Owl. “OK! I shall wait then,” said Bucky. Click for larger view View full resolution[End Page 116]At night, the Flying Squirrels came out and started flying from tree to tree. Bucky begged them to teach him how to fly. They said, “We don’t fly. We glide. We are called Flying Squirrels, but we don’t fly.” “Oh! Dear! Let me learn to glide then. Gliding is surely better than falling like a rock,” said Bucky. He climbed to the top of trees with the squirrels and jumped across just like them. They glided to the tree trunks far far away.But Bucky fell yet again with a big thud, and a bigger scream. “Aaaah! Eeeeeh!! Ooooooh!!!” He woke up the whole forest in the middle of the night. The animals were... (shrink)

This essay investigates time-lapse cinematography as a hybrid, intermedial practice. To interrogate practices of authorship, publication, copying, storage, and especially distribution, it recovers the history of The Embryonic Development of Drosophila melanogaster, a film made by Eric Lucey at the University of Edinburgh in 1956. An unusually rich archive makes it possible to recover uses and reuses of time-lapse footage in research, teaching, and other forms of communication.

The potential negative impacts of biological pest control on non-target species have become the focus of a contentious debate. In this article, we use examples from both classical and augmentative biological control of fruit fly pests in Hawaii to address several important factors in assessing non-target risks of fruit fly parasitoids. Several fruit fly parasitoids have been introduced to Hawaii and contribute substantially to the reduction of pest populations in the state's farms and forests. However, an historical lack of host-specificity (...) testing of these parasitoids with non-target species has raised concerns about their impact on non-pest fruit flies, including some flies deliberately introduced for biological control of weeds and others that are endemic Hawaiian species. When developing protocols to assess risks of introduced fruit fly parasitoids, we need first to define an appropriate range of species against which host specificity should be tested. For assessing susceptibility of a non-target species to parasitoids, behavioral tests are as important as suitability tests. Experimental factors, such as host-exposure substrate, absence or presence of preferred hosts, and laboratory vs. natural conditions, are shown to affect the results of host-specificity tests and risk analysis. Still, assessing long-term, indirect ecological impacts of parasitoids and weighing potential risks and benefits in multiple dimensions (besides dollar values) remains a challenge to environmentalists, conservationists, applied ecologists, and biocontrol practitioners. (shrink)

The psychological writings of the Islamic philosopher Avicenna are noted for the hypothetical example he gives of the man suspended in space—the “Flying Man.” This example, which left its impress on the Latin scholastics and has engaged the attention of modern scholars, occurs thrice in his writings in contexts that are closely related, but not identical. Its third occurrence, which represents a condensed version, conveys the general idea. It states, in effect, that if you imagine your “entity,” “person,” “self” to (...) be created at birth fully mature, sound in mind and body, but suspended in temperate air in such a manner that this “self” is totally unaware of its body and physical circumstances, “you will find that it will be unaware of everything except the ‘fixedness’ of its individual existence.”. (shrink)

Francesco Redi’s seventeenth-century experiments on insect generation are regarded as a key contribution to the downfall of belief in spontaneous generation. Scholars praise Redi for his experiments demonstrating that meat does not generate insects, but condemn him for his claim elsewhere that trees can generate wasps and gallflies. He has been charged with rejecting spontaneous generation only to change his mind and accept it, and in the process, with failing as a rigorous experimental philosopher. In this paper I defend Redi (...) from both of these charges. In doing so, I draw some broader lessons for our understanding of spontaneous generation. ‘Spontaneous generation’ does not refer to a single theory, but rather a landscape of possible views. I analyze Redi’s theoretical commitments and situate them within this landscape, and argue that his error in the case of insects from plants is not as problematic as previous commentators have said it is. In his research on gall insects Redi was addressing a different question from that of his experiments on insect generation—the question was not “Can insects come from nonliving matter?,” but rather, “Can insects come from living organisms which are not their parents?” In the latter case, he gave an answer which we now know to be false, but this was not due to any failure in his rigor as an experimental philosopher. (shrink)