In the life of any species, extinction is the final evolutionary process. It is a common one at present, as the world is entering a major extinction crisis. The pattern of extinction and threat is very non-random, with some taxa being more vulnerable than others. Explaining why some taxa are affected and some escape is a major goal of conservation biology. More ambitiously, a predictive model could, in principle, be built by integrating comparable studies of past and present extinctions. We (...) review progress towards both explanatory and predictive frameworks, comparing correlates of extinction in different groups at different times. Progress towards explanatory models for the current crisis is promising, at least in some well-studied taxa, but the development of a truly predictive model is hampered by the formidable difficulties of integrating studies of present and past extinctions. BioEssays 22:1123–1133, 2000. © 2000 John Wiley & Sons, Inc. (shrink)

Human microbiome research makes causal connections between entire microbial communities and a wide array of traits that range from physiological diseases to psychological states. To evaluate these causal claims, we first examine a well-known single-microbe causal explanation: of Helicobacter pylori causing ulcers. This apparently straightforward causal explanation is not so simple, however. It does not achieve a key explanatory standard in microbiology, of Koch’s postulates, which rely on manipulations of single-microorganism cultures to infer causal relationships to disease. When Koch’s postulates (...) are framed by an interventionist causal framework, it is clearer what the H. pylori explanation achieves and where its explanatory strengths lie. After assessing this ‘simple’, single-microbe case, we apply the interventionist framework to two key areas of microbiome research, in which obesity and mental health states are purportedly explained by microbiomes. Despite the experimental data available, interventionist criteria for explanation show that many of the causal claims generated by microbiome research are weak or misleading. We focus on the stability, specificity and proportionality of proposed microbiome causal explanations, and evaluate how effectively these dimensions of causal explanation are achieved in some promising avenues of research. We suggest some conceptual and explanatory strategies to improve how causal claims about microbiomes are made. (shrink)

The Queensland fruit fly (Bactrocera tryoni) is a generalist pest that poses a significant threat to the Australian horticultural industry. This species has become broadly established across latitudes that encompass tropical to temperate climates, and hence populations occupy diverse thermal niches. Successful expansion across this range may have been brokered by evolutionarily labile features of breeding phenology, physiology and/or behaviour. We explored the potential role of behavioural flexibility by characterizing variation in adult thermal preference using a novel gradient apparatus. Flies (...) oriented within this apparatus essentially at random in the absence of thermal variation, but sought and maintained precise positions when presented with an established gradient. Male and female flies from an ‘old’ colony (>300 generations) and a ‘young’ (F7) colony were compared. Whereas we found no difference between the sexes, flies from the young colony preferred higher temperatures (30.93 ± 7.30 °C) and had greater individual variation than their counterparts from the old colony (28.16 ± 5.63 °C). Given that B. tryoni are routinely maintained at 25 °C in the laboratory, a lower mean preference of the old colony is consistent with thermal adaptation. This is further supported by their reduced phenotypic variance, which follows as a logical consequence of stabilising selection given long-term environmental constancy. These results demonstrate that B. tryoni seek to thermoregulate via adult behaviour, and that individual temperature preference can be precisely measured using a gradient apparatus. The evidence for adaptive tuning of this behaviour has importance for both the design of captive rearing protocols as well as the prediction of invasive potential and species biogeography under future climatic variation. -/- . (shrink)

The concept of animal personality is based on consistent individual differences in behaviour, yet little is known about the factors responsible for such variation. Theory based on sex-specific selection predicts sexual dimorphism in personality-related traits and, in some cases, differences in trait variances between the sexes. In this study, we examined the sources of individual variation for boldness behaviour in guppies (Poecilia reticulata). We first demonstrated heightened boldness expression in males relative to females across feral wild types, artificially selected domestic (...) ‘designer’ guppies, and putative hybrids of the two. Boldness and body size covaried at the strain level but were not associated among individuals within strains. We also found high and repeatable behavioural differences among individuals (0.40 > intraclass r > 0.60) in all sex/strain groups except hybrid strain females. However, there was no evidence for the heightened inter-individual male variance anticipated for personality traits subject to certain forms of directional sex-specific selection. Domestic fish were boldest overall, and indicated the largest sex difference, which is consistent with genetic linkage between boldness and male ornamental colouration. Consistently high intrinsic variation in boldness behaviour, which extends to inbred domesticated fish, may in part underpin the invasive potential of this species. (shrink)

A high heritability estimate usually corresponds to a situation in which trait variation is largely caused by genetic variation. However, in some cases of gene-environment covariance, causal intuitions about the sources of trait difference can vary, leading experts to disagree as to how the heritability estimate should be interpreted. We argue that the source of contention for these cases is an inconsistency in the interpretation of the concepts ‘genotype’, ‘phenotype’, and ‘environment’. We propose an interpretation of these terms under which (...) trait variance initially caused by genetic variance is subsumed into a heritability for all cases of gene-environment covariance. (shrink)

Gene–environment covariance is the phenomenon whereby genetic differences bias variation in developmental environment, and is particularly problematic for assigning genetic and environmental causation in a heritability analysis. The interpretation of these cases has differed amongst biologists and philosophers, leading some to reject the utility of heritability estimates altogether. This paper examines the factors that influence causal reasoning when G–E covariance is present, leading to interpretive disagreement between scholars. It argues that the causal intuitions elicited are influenced by concepts of agency (...) and blame-worthiness, and are intimately tied with the conceptual understanding of the phenotype under investigation. By considering a phenotype-specific approach, I provide an account as to why causal ascriptions can differ depending on the interpreter. Phenotypes like intelligence, which have been the primary focus of this debate, are more likely to spark disagreement for the interpretation of G–E covariance cases because the concept and ideas about its ‘normal development’ relatively ill-defined and are a subject of debate. I contend that philosophical disagreement about causal attributions in G–E covariance cases are in essence disagreements regarding how a phenotype should be defined and understood. This moves the debate from one of an ontological flavour concerning objective causal claims, to one concerning the conceptual, normative and semantic dependencies. (shrink)

Purpose Genetic research, via the mainstream media, presents the public with novel, profound findings almost on a daily basis. However, it is not clear how much laypeople understand these presentations and how they integrate such new findings into their knowledge base. Genetic knowledge (GK), existing causal beliefs, and genetic essentialist tendencies (GET) have been implicated in such processes; the current study assesses the relationships between these elements and how brief presentations of media releases of scientific findings about genetics are consumed (...) and affect the readers. -/- Methods An Australian national survey of GK, GET, and existing causal beliefs about health phenomena (heart disease and obesity) was conducted. Participants were also exposed to news headlines that offered genetic and non-genetic partial explanations of the same health phenomena and reported their evaluations of these headlines, as well as the effects of the headlines on their personal understanding of the health phenomena. -/- Results GK was negatively-associated with GET. Whereas GK did not directly predict the evaluation and effects of the genetic headlines, GET did. GK predicted the effects of the headlines indirectly via GET and via GET and existing causal beliefs. -/- Conclusion GET seem to predict unwarranted effects of exposure to news headlines about genetic science, whereas GK seems to indirectly mitigate the same unwarranted effects. (shrink)

We agree with N. Sekar and D. Shillers (“Engage with animal welfare in conservation,” Policy Forum, 7 August, p. 629) that welfare considerations are an important part of the myriad values in conservation. However, more humane conservation tactics are often costlier. The money and resources spent on humane conservation practices detract from the resources available for other conservation projects. This hidden ethical cost of humane conservation must be considered when proposing new approaches to conservation management.

Much microbiota-gut-brain research focuses on the causal role of microbiomes as a whole, rather than their component parts: microbes. Hooks et al. find these whole-community explanations inadequate; however, they do not provide suggestions for better explanations. By appealing to proportionality – a criterion that can be used to develop more appropriate causal explanations – more accurate causal claims can be made.

This volume is based on the 2004 series of the Oxford Amnesty Lectures, one of the world's leading name lecture series. In it major figures in philosophy, political science, law, psychoanalysis, sociology, and literature address the challenges that displacement, asylum, and migration pose to our notions of human rights.

Sexually signalling animals must trade off the benefits of attracting mates with the consequences of attracting predators. For male guppies, predation risk depends on their behaviour, colouration, environmental conditions and changing intensity of predation throughout the day. Theoretically, this drives diel patterns of display behaviour in native Trinidadian populations, where males display more under low-light conditions when their most dangerous predator is less active. Here, we observed Australian guppies in a laboratory setting to investigate their diel display pattern, and if (...) this pattern is controlled by ambient light intensity. We also quantified individual variation in both the daily frequency and diel pattern of displays, and if such variation relates to body size, colouration and a non-sexual behaviour. Under a typical daily light regime, male guppies displayed mostly in the first hour of observation. Extending the duration of dawn-like lighting, however, resulted in an extended period of high display, demonstrating that light intensity per se is an important cue for this behaviour. These findings mirror those obtained for Trinidadian populations, suggesting that male courtship timing is likely shaped by broad, potentially generalizable features of guppy ecology. The effect of acclimation to captive conditions on male behaviour is also discussed. Whereas the temporal pattern of display appeared consistent, individuals varied in their daily display frequency, and this was correlated with variation in colour phenotype and a measure of non-sexual risk acceptance behaviour. Such relationships pose promising avenues for integrating behavioural and sensory ecology with contemporary work on behavioural syndromes and animal personality. (shrink)

Effective altruism is a growing humanitarian movement with a track record of success in evaluating the effectiveness of charitable spending across a wide range of projects. We suggest ways in which the foundations of this movement can be applied to the complex world of conservation.

Most explanations of beliefs are epistemically or pragmatically rationalizing. The distinction between these two types involves the explainer's differing expectations of how the believer will behave in the face of counter-evidence. This feature suggests that rationalizing explanations portray beliefs as either a consequence of the believer's following a norm, or part of a sub-intentional goal-oriented system. Which properly characterizes pragmatic believing? If there were pragmatic norms for believing, I argue, they would not be consciously followable. Yet an unallowable norm is (...) not a norm at all, and so I conclude that there are no such norms and that pragmatic believing is a sub-intentional, and not a norm-driven, process. /// La mayoría de las explicaciones de las creencias racionalizan de forma epistémica o pragmática. La distinción entre estas dos involucra las diferentes expectativas del que explica acerca de cómo se comportará el creyente frente a evidencia contraria. Este rasgo sugiere que las explicaciones racionalizadoras toman las creencias o bien como una consecuencia de que el creyente siga una norma, o bien como parte de su sistema subintencional orientado a fines. ¿Cuàl caracteriza de manera apropiada el creer pragmático? Aquí argumento que si hubiera normas pragmáticas para creer, no se podrían seguir conscientemente; sin embargo, una norma no seguible no es una norma en ningún sentido, por lo que concluyo que no existen tales normas y que el creer pragmático es un proceso subintencional y no un proceso guiado por normas. (shrink)

The proponents of the ‘vindication’ or ‘pragmatic justification’ of induction have attempted to show that induction will work if any method does. This in turn serves as grounds for their claim that we have everything to gain by using induction and nothing to lose. Hence, they conclude that it is rational to use induction. Their claim that induction will work if any mehtod does is based upon the following argument:If nature is uniform, induction will work. If nature is not uniform (...) and some other method works, the success of that method will then constitute a regularity to which induction can be successfully applied. In that case, induction will sanction the continued use of the successful method and hence will be successful as well. (shrink)

The aim of this virtual special issue is to bring together philosophical and historical perspectives to address long-standing issues in the interpretation, utility, and impacts of quantitative genetics methods and findings. Methodological approaches and the underlying scientific understanding of genetics and heredity have transformed since the field's inception. These advances have brought with them new philosophical issues regarding the interpretation and understanding of quantitative genetic results. The contributions in this issue demonstrate that there is still work to be done integrating (...) old and new methodological and conceptual frameworks. In some cases, new results are interpreted using assumptions based on old concepts and methodologies that need to be explicitly recognised and updated. In other cases, new philosophical tools can be employed to synthesise historical quantitative genetics work with modern methodologies and findings. This introductory article surveys three general themes that have dominated philosophical discussion of quantitative genetics throughout history: (1) how methodologies have changed and transformed our knowledge and interpretations; (2) whether or not quantitative genetics can offer explanations relating to causation and prediction; and (3) the importance of defining the phenotypes under study. We situate the contributions in this virtual special issue within a historical framework addressing these three themes. (shrink)

Because higher education brings members of academic communities in direct contact with students, the reflective higher education student is in an excellent position for developing two important intellectual virtues: confidence and humility. However, academic communities differ as to whether their members reach consensus, and their teaching practices reflect this difference. In this essay, Ward Jones argues that both consensus‐reaching and non‐consensus‐reaching communities can encourage the development of intellectual confidence and humility in their students, although each will do so in (...) very different ways. (shrink)

Moral education is an important topic—both for moral philosophy and for the philosophy of education. Of the many questions that ought to be asked about moral education, certainly the following would be included in any reasonable list: What constitutes a moral education? How does one properly give someone a moral education? and Why provide persons with moral education? I have little to say about question. My main interest in this paper is in the third question, but I shall approach it (...) by first concentrating on question. What does a person have if he possesses a moral education? What is lacking and what is defective in an individual who does not have one? (shrink)

Glaucon's Challenge at the beginning of Book 2 of Plato's Republic has long prompted interpretive difficulties, due to a misunderstanding of its central aspect. The task of this essay is to correct...

While the nature-grace debate rages in Thomistic circles, St. Bonaventure's theological anthropology and his theology of grace is paid much less attention, with the exception of his argument that Adam was created apart from gratia gratum faciens, or in modern terms habitual or sanctifying grace.1 For this position he has come under some scrutiny. John Milbank connects Adam's short time without habitual grace to Bonaventure's deficient understanding of illumination as proof of an incipient voluntarism and a suspect pure nature theology.2 (...) Turning Milbank upon his head, Fr. Christopher Cullen, S.J. defends the "suspended middle" in Bonaventure by appealing to Adam's creation without grace; human nature has a... (shrink)

ABSTRACTShelley’s “Letter to Maria Gisborne” is a playful improvisational verse epistle, widely praised for its urbanity and its display of the poet’s invention. The verses turn on a catalogue of the collection of odd scientific and mechanical objects that Shelley found scattered around him in the place he composed the letter, the Livorno workshop of Gisborne’s son, a young engineer who was building a new-model steamboat at the time. In the context of that space, the poem reads as a response (...) to competing notions of invention. For Shelley, the engineer’s workshop is an attractive alternative to the poet’s tower—which was uncomfortably close to a Grub Street garret. Verbal and visual images of poets’ and scientists’ workshops, from Hogarth and Mary Robinson, to Joseph Wright of Derby and Frankenstein, illustrate the tensions embodied in the physical location and poetic performance of Shelley’s celebrated “Letter.”. (shrink)

The Southern Journal of Philosophy, EarlyView.

The neologism post-truth is commonly used to characterize a polity in which false and biased beliefs have corrupted public opinion and policymaking. Simplifying and broadening our use of the adjective beyond its current narrow meaning could make post-truth a useful addition to the lexicons of history, politics, and philosophy. Its current use, however, is unhelpful and distracting (at best), and experienced as demeaning and humiliating (at worst). Contemporary polities are better characterized as post-trust. A polity becames post-trust when testimony from (...) either a community of knowledge workers or a social group of complainants—such as women who give testimony of sexual assault—loses influence upon public opinion and policymaking. (shrink)

Dark comedies invite us to laugh at something which is, at least ostensibly, not funny at all. They take an act or event that would, under most descriptions or presentations, invite pity or anger, and give it characteristics that invite amusement. It is essential to the humour of the kidnapping in The King of Comedy that it is a kidnapping. The immorality of this event is crucial to its humour.

In _Bioethics in Context_, Gary Jones and Joseph DeMarco connect ethical theory, medicine, and the law, guiding readers toward a practical and legally grounded understanding of key issues in health-care ethics. This book is uniquely up-to-date in its discussion of health-care law and unpacks the complex web of American policies, including the Patient Protection and Affordable Care Act. Useful case studies and examples are embedded throughout, and a companion website offers a thorough, curated database of relevant legal precedents as (...) well as additional case studies and other resources. (shrink)