The fitness of any evolutionary unit can be understood in terms of its two basic components: fecundity (reproduction) and viability (survival). Trade-offs between these fitness components drive the evolution of life-history traits in extant multicellular organisms. We argue that these trade-offs gain special significance during the transition from unicellular to multicellular life. In particular, the evolution of germ–soma specialization and the emergence of individuality at the cell group (or organism) level are also consequences of trade-offs between the two basic fitness (...) components, or so we argue using a multilevel selection approach. During the origin of multicellularity, we study how the group trade-offs between viability and fecundity are initially determined by the cell level trade-offs, but as the transition proceeds, the fitness trade-offs at the group level depart from those at the cell level. We predict that these trade-offs begin with concave curvature in single-celled organisms but become increasingly convex as group size increases in multicellular organisms. We argue that the increasingly convex curvature of the trade-off function is driven by the cost of reproduction which increases as group size increases. We consider aspects of the biology of the volvocine green algae – which contain both unicellular and multicellular members – to illustrate the principles and conclusions discussed. (shrink)

All disciplines must define their basic units and core processes. In evolutionary biology, the core process is natural selection and the basic unit of selection and adaptation is the individual. To operationalize the theory of natural selection we must count individuals, as they are the bearers of fitness. While canonical individuals have often been taken to be multicellular organisms, the hierarchy of life shows that new kinds of individuals have evolved. A variety of criteria have been used to define biological (...) individuality. Some criteria rely on the presence/absence of a particular property while others advocate an approach that reflects the process of natural selection. The plethora of approaches to classifying individuality has resulted in confusion regarding how to study individuality in a given taxon. (shrink)

Understanding good design requires addressing the question of what units undergo natural selection, thereby becoming adapted. There is, therefore, a natural connection between the formal Darwinism project (which aims to connect population genetics with the evolution of design and fitness maximization) and levels of selection issues. We argue that the formal Darwinism project offers contradictory and confusing lines of thinking concerning level(s) of selection. The project favors multicellular organisms over both the lower (cell) and higher (social group) levels as the (...) level of adaptation. Grafen offers four reasons for giving such special status to multicellular organisms: (1) they lack appreciable within-organism cell selection, (2) they have multiple features that appear contrived for the same purpose, (3) they possess a set of phenotypes, and (4) they leave offspring according to their phenotypes. We discuss why these rationales are not compelling and suggest that a more even-handed approach, in which multicellular organisms are not assumed to have special status, would be desirable for a project that aims to make progress on the foundations of evolutionary theory. (shrink)

We review Evolution and the Levels of Selection by Samir Okasha. This important book provides a cohesive philosophical framework for understanding levels-of-selections problems in biology. Concerning evolutionary transitions, Okasha proposes that three stages characterize the shift from a lower level of selection to a higher one. We discuss the application of Okasha’s three-stage concept to the evolutionary transition from unicellularity to multicellularity in the volvocine green algae. Okasha’s concepts are a provocative step towards a more general understanding of the major (...) evolutionary transitions; however, the application of certain ideas to the volvocine model system is not straightforward. (shrink)

Recent philosophical discussions have failed to clarify the roles of the concept fitness in evolutionary theory. Neither the propensity interpretation of fitness nor the construal of fitness as a primitive theoretical term succeed in explicating the empirical content and explanatory power of the theory of natural selection. By appealing to the structure of simple mathematical models of natural selection, we separate out different contrasts which have tended to confuse discussions of fitness: the distinction between what fitness is defined as versus (...) what fitness is a function of, the contrast between adaptedness as an overall property of organisms and specific adaptive capacities, the distinction between actual and potential reproductive success, the role of chance versus systematic causal relations, fitness as applied to organisms as opposed to fitness applied to genotype classes, heritable adaptive capacities of genotypes as opposed to relations between genotypes and the environment. We show how failure to distinguish and properly interrelate these different aspects of “fitness” adds confusion to a number of already complex issues concerning evolutionary theory. On the basis of our discussion of these different aspects of “fitness”, we propose a terminology which makes the necessary distinctions. A central result of our analysis is that the concept of fitness as the overall adaptedness of organisms does not enter into the causal structure of evolutionary explanation, at least to the extent that this structure is represented in the mathematical models of natural selection. (shrink)

This chapter combines formal models of how the fitness of a collective can become decoupled from the fitness with more empirical work on the volvocine algae. It uses the Volvox clade as a model system. It describes the evolution of altruism in the volvocine green algae. This chapter suggests that altruism may evolve from genes involved in life-history trade-offs. It shows the several cooperation, conflict, and conflict mediation cycles in the volvocine green algae. This cycle of cooperation, conflict, and conflict (...) mediation drives evolutionary transitions in individuality. (shrink)

This is an excellent addition to Bobbs-Merrill's "Text and Commentary Series." In addition to the text of the Principles, there are eleven critical essays, three of which are original with this volume. Turbayne has arranged the essays to parallel the unfolding of the major themes in the Principles. Thus, he himself opens with "Berkeley's Metaphysical Grammar," which picks up and develops the theme of the centrality of the study of language to the philosophical enterprise, a point Berkeley makes in his (...) "Preface." Next, W. H. Hay and Richard Van Iten are paired together with different perspectives on Berkeley's nominalism. By way of comment on esse is percipi, G. E. Moore and W. T. Stace present their respective refutations of idealism and realism. Richard Popkin discusses skepticism and Berkeley. Popper examines the ways in which Berkeley anticipated Mach and Einstein, as well as significant features of contemporary philosophy of science. Turbayne and Cornman offer differing appraisals of the philosophy of mind that is sketched in the Principles. Paul Olscamp attempts to systematize the elements of Berkeley's critical theory. Finally, J. D. Mabbott treats of "The Place of God in Berkeley's Philosophy" and argues for a radical voluntarism in Berkeley--a not surprising analysis, but one which often gets buried under the epistemological issues raised in the Principles. Turbayne has also supplied an excellent introduction, a chronology of Berkeley's life, a working bibliography, and an analytical index. This enhances the usefulness of an already first-rate book.--E. A. R. (shrink)

Upshot: Richard Michod is professor and head of the Department of Ecology and Evolutionary Biology at the University of Arizona. He met Ernst von Glasersfeld at the University of Georgia and was a member of the Thursday evening epistemology seminar group. In his essay he recalls the discussions he had with Ernst on the nature of evolution and adaptation.

A few years ago I ran across a statement by Jean-Paul Sartre which seemed to imply that if there is a God, then there can be no human freedom. That thesis struck me as questionable, but at the time I did not pause to examine it. More recently I ran across a similar, more explicit statement by Kurt Baier, and I decided the time to pause had come. My knee-jerk response to Baier – and I confess it was probably nothing (...) more – was, ‘Why can't there be human freedom if there is a God? Indeed, can there be human freedom if there isn't a God ?’ The second of these questions has proved to be the more provocative to me, for the more I have thought about it, the more it has seemed to me that it is the atheist and not the theist who should be on the defensive about libertarianism, i.e. the position that human beings do act, that human actions are not determined, that we are the sole cause of our actions, and that all things remaining the same, we could have done otherwise. Indeed, the more I thought about that question – Can there be human freedom if there is no God? – the more convinced I became that the atheist has no good reason for believing in libertarianism. Note: I am not saying that atheism is logically incompatible with libertarianism. Perhaps it is, but if it is, that is not yet obvious to me. Rather, I am saying that an atheist who believes in libertarianism must believe in it on the basis of faith and must hold this faith in opposition to the only type of evidence that is available to him. Hence, by denying the existence of God, Baier and Sartre do not make room for human freedom; they make belief in human freedom irrational. By contrast, I shall argue, the theist does have a good reason for believing that humans are free. Let's take separate looks at Baier and Sartre; then I shall summarize the substance of my position. (shrink)

Although most colonisations have been invasions of territory by neighbouring peoples with similar appearances, languages, and customs, postcolonial theory is dominated by cases of inter-civilizational imperialism between the West and the non-West. This article argues that a new theoretical framework is needed to describe intra-civilizational colonial encounters because the psychological conflicts of the intra-civilizational colonial sphere and their political ramifications function differently to those described in postcolonial theory. Drawing on Nobel Prize nominee Richard E. Kim’s memoir of growing up (...) in Korea during the Japanese Occupation, this article explicates the primary differences between the two forms of colonialism with reference to Homi Bhabha’s theories of hybridity and mimicry. It argues that without a visible racial difference between coloniser and colonised, hybridity and mimicry are imperial strategies of assimilation rather than native strategies of resistance and that the growth of cultural nationalism is a logical response. (shrink)

While reflecting one day on the enormous difficulties that men have in knowing that there is a God, a completely unexpected and unfamiliar question drifted into my purview – perhaps as a kind of ultimate expression of my philosophical frustration. ‘Indeed’, the question asked, ‘can even God know that he is God?’ At first I thought this query merely amusing. ‘Wouldn't it be funny if God cannot know that he is God! But of course he can.’ So my mind wandered (...) on to other things. The question did not leave me alone, though. It insisted that I take it seriously, and the more I did, the more legitimate, complex, and significant it came to seem - and still does. (shrink)

The Warner Books back cover proclaims: In the tradition of Oliver Sachʼs [sic] bestselling *The Man Who Mistook His Wife for a Hat...* The manner and misspellingsignify that Cytowic himself had nothing to do with such publishing hucksterism. However, one thing is clear upon reading this book: Richard Cytowic, M.D., is no Oliver Sacks. Though, as will be seen, there is much in here to recommend itself, his stilted reproduction of conversations which or may not have taken place and (...) his CreativeFiction 100 characterizations (i.e., Dr. Wood's continual inhalation of smoke or food) strike the experienced reader as painfully contrived, as though Cytowic were doing hislevel best to imitate Sacks and reach that always-elusive wider audience. (shrink)

Rights might be regarded as an objectionable and even a dangerous feature of moral, political, and legal arrangements. It is an element of all types of rights that Able's having right X entails requirements or prohibitions for Baker. These restrictions hold against Baker at Able's discretion, that is unless Able excuses Baker from respecting them. Nor are the restrictions merely decorative. We must presume that they are established because of the expectation that Baker would otherwise be disposed to interfere with (...) the action Ms. Able's right warrants her in taking. Thus as writers as early as Spinoza have stressed, rights are powers – one might even say weapons – that Able may use against Baker. Of course, as a practical matter these “weapons” are frequently ineffective. Ms. Baker may willfully ignore her obligations and prevent Ms. Able from enjoying her entitlements. But such occurrences, as common and as unfortunate as they are, do not materially ease the task of justifying rights. It is only insofar as rights are effective, and hence only insofar as anyone will have reason to defend them, that they are weapons in Able's hands. (shrink)

O presente trabalho tem como objetivo desenvolver uma comparação direta entre a ética da futurologia jonasiana e o neopragmatismo rortyano no que diz respeito ao tema da esperança na prática política. Este tema foi amplamente discutido por Ernest Bloch que propõe um princípio esperança capaz de ser o impulso basilar para que o homem transcenda o presente em direção ao futuro. Por sua vez, Richard Rorty aborda este tema enquanto esperança social, que diz respeito à manutenção do orgulho nacional (...) capaz de tornar-se condição necessária para o auto-aperfeiçoamento da sociedade. Porém, Hans Jonas trará a esse discurso da esperança uma perspectiva da ética da responsabilidade que prefere a prudência às previsões das ações a longo prazo enquanto promessa para um “mais” ou “melhor”. (shrink)

The essays in this book are meant to serve as an introduction to those ideas of Ayn Rand, which are of particular relevance to business people. Rand was known as a spirited defender of the laissez-faire free enterprise system. It is less commonly known that Rand was also deeply committed to the centrality of the enterprise of philosophy for both public and private life. The essays in this book try to bridge the gap between these two aspects of Rand’s thought. (...) The results of the review of the book are mostly positive. The review attempts to separate the different themes in the book such as the importance of philosophy in general, the importance of philosophy for business, the philosophical defense of the free enterprise system and then to evaluate the evidence and arguments presented by the essayists for each claim. (shrink)