The ‘Tree of Life’ is intended to represent the pattern of evolutionary processes that result in bifurcating species lineages. Often justified in reference to Darwin’s discussions of trees, the Tree of Life has run up against numerous challenges especially in regard to prokaryote evolution. This special issue examines scientific, historical and philosophical aspects of debates about the Tree of Life, with the aim of turning these criticisms towards a reconstruction of prokaryote phylogeny and even some aspects of the standard evolutionary (...) understanding of eukaryotes. These discussions have arisen out of a multidisciplinary collaboration of people with an interest in the Tree of Life, and we suggest that this sort of focused engagement enables a practical understanding of the relationships between biology, philosophy and history. (shrink)

Six schools of thought can be detected in the development of evolutionary theory in German paleontology between 1859 and World War II. Most paleontologists were hardly affected in their research by Darwin's Origin of Species. The traditionalists accepted evolution within lower taxa but not for organisms in general. They also rejected Darwin's theory of selection. The early Darwinians accepted Darwin's theory of transmutation and theory of selection as axioms and applied them fruitfully to the fossil record, thereby laying the foundation (...) for the new research areas of phylogeny and paleo-biology. The enthusiasm of the early Darwinians faded when the fossil record and the problems of its interpretion became more widely known. The pluralists of the turn of the century invented and adopted a wealth of hypothetical mechanisms in order to explain individual features of the fossil record. They failed, however, to provide one coherent theory. Dissatisfaction with this situation led to adoption of a dogmatic neo-Lamarckism, which was regarded as a coherent theory providing a fruitful research program. The rejection of the Lamarckian mechanism early in this century left paleontologists with only one kind of evolutionary mechanism: inner causes.Like many neo-Lamarckians several orthogeneticists were highly interested in adaptation and did not see any contradiction between the inner causes of evolution and adaptation. The dominance of stratigraphical research programs in paleontology led in the 1930s and 1940s to a decrease in interest in adaptation. Stratigraphical records of taxa were accepted as meaningful in the context of evolutionary theory. Orthogenesis and the new concepts of saltation and cyclicism were amalgamated into one theory : typostrophism. This theory dominated German paleontology for decades after the war and only recently has the synthetic theory been seriously considered.Evolution was never very intensively discussed in German paleontology in the hundred years after Darwin's book. Most information used here comes from textbooks or from papers given on special occasions. It has been impossible to summarize how members of one school defended their views or discussed the ideas of competing schools. (shrink)

One of the purposes of the research program referred to as “systematic biogeography” is the use of species distributions to identify regions and reconstruct biotic area relationships. The reverse, i.e. to group species according to the areas that they live in, leads to the recognition of chorological categories. Biogeographers, working under these two different approaches, have proposed several terms to refer to groups of species that have similar distributions, such as “element”, “chorotype” and “component”. A historical reconstruction, including semantic observations (...) and philosophical implications, shows that these terms have been used in a variety of senses. The word “component” should not be used in biogeography. The word “element” has been used to identify both a group of species defined according to the biogeographic areas they occupy and a group of species with an assumed shared biogeographic history. It is especially because of the influence of the dispersalist paradigm, which dominated evolutionary thought until the mid-twentieth century, that the second definition has been frequently adopted. The term “element” is therefore ambiguous and its use should always be associated with an explicit definition. The word “chorotype” should be used to define groups of species with similar ranges when no causal assumption is made. The concept of “chorotype,” finally, should not be confounded with other concepts such as distributional pattern, cenocron, horofauna, biota, endemic area, area of endemism, biotic element, and generalized track, which are also discussed in this paper. (shrink)

Samuel Butler is usually remembered for Erewhon, widely considered among the best English satires. He also contributed to philosophical biology in works that collectively compose the nineteenth century's finest statement of the evolutionary argument associated with the name of Lamarck. In writing on evolution, Butler was not presenting science for a popular audience but deliberately intervening in the scientific argument about Darwinism. Surprised by the success of his first venture in philosophical biology, Life and Habit, Butler committed himself to the (...) project of developing an alternative to Darwinism, which he did in three additional volumes, and these are the works canvassed in this “delayed book review.”. (shrink)

Experiences of enlightened unity with Nature or with Deity are reported not only in the mystical literature of the past but also in contemporary accounts of the psychedelic adventurer. In Chapter 13, Peter Sjöstedt-Hughes seeks to fathom such reported states within the framework of the metaphysics of Benedict de Spinoza – a metaphysics encompassing monism, pantheism, panpsychism, and the eternal substance: the timelessness of pure Nature, God itself. God is Nature for Spinoza. To achieve this framework, the tenets of Spinozism (...) are explicated with a culmination in the Intellectual Love of God, amor Dei intellectualis, where the finite mind and infinite intellect of Nature unite. Sjöstedt-Hughes then provides a phenomenological account of the unitive states occasioned by certain psychedelic substances, notably the ever-so potent 5-MeO-DMT, comparing these phenomenological elements to the ontological aspects of Spinozism. This comparative analysis will proffer a Spinozan-Psychedelic symbiosis: that certain psychedelic states can be understood through the Spinozan system, and that the Spinozan system can be intuited through certain psychedelic states – a blinding flash of Spinozism that can change one’s relation to oneself and to Nature itself. (shrink)

The rise of the mechanistic worldview in the seventeenth century had a major impact on views of biological generation. Many seventeenth century naturalists rejected the old animist thesis. However, the alternative view of gradual mechanistic formation in embryology didn’t convince either. How to articulate the peculiarity of life? Researchers in the seventeenth century proposed both “animist” and mechanistic theories of life. In the eighteenth century again a controversy in biology arose regarding the explanation of generation. Some adhered to the view (...) that life is a physical property of matter (e.g. Buffon), others saw living entities as the result of the development of pre-existing germs (e.g. Bonnet). Naturalists, lacked a convincing account that could guide their research. In interaction with leading naturalists of his time Immanuel Kant articulated an approach to explaining generation. Kant’s account, delineated in his Kritik der Urteilskraft (Critique of the power of judgment) (1790), is a combination of Newtonian non-reductionist mechanism in explanation, and a concept of natural end comparable to Stahl’s formal conception of organic bodies. It consists of two claims: a) in biology only mechanical explanation is explanatory, and b) living entities contain some original organisation, which is mechanically unexplainable. In the nineteenth century this approach influenced naturalists as Müller, Virchow, and Von Baer, in their physiological research. Dissatisfied with a sheer mechanistic or, on the other hand, a sheer teleological approach, they appreciated the Kantian account of mechanical explanation of natural ends. In Germany, in the second halve of the nineteenth century, Ernst Haeckel reopened the debate about abiogenesis, which still continuous. (shrink)

In recent years, biologists and philosophers of science have argued that evolutionary theory should incorporate more seriously the idea of ‘reciprocal causation.’ This notion refers to feedback loops whereby organisms change their experiences of the environment or alter the physical properties of their surroundings. In these loops, in particular niche constructing activities are central, since they may alter selection pressures acting on organisms, and thus affect their evolutionary trajectories. This paper discusses long-standing problems that emerge when studying such reciprocal causal (...) processes between organisms and environments. By comparing past approaches to reciprocal causation from the early twentieth century with contemporary ones in niche construction theory, we identify two central reoccurring problems: All of these approaches have not been able to provide a conceptual framework that allows maintaining meaningful boundaries between organisms and environments, instead of merging the two, and integrating experiential and physical kinds of reciprocal causation. By building on case studies of niche construction research, we provide a model that is able to solve these two problems. It allows distinguishing between mutually interacting organisms and environments in complex scenarios, as well as integrating various forms of experiential and physical niche construction. (shrink)

Applied Evolutionary Epistemology is a scientific-philosophical theory that defines evolution as the set of phenomena whereby units evolve at levels of ontological hierarchies by mechanisms and processes. This theory also provides a methodology to study evolution, namely, studying evolution involves identifying the units that evolve, the levels at which they evolve, and the mechanisms and processes whereby they evolve. Identifying units and levels of evolution in turn requires the development of ontological hierarchy theories, and examining mechanisms and processes necessitates theorizing (...) about causality. Together, hierarchy and causality theories explain how biorealities form and diversify with time. This paper analyzes how Applied EE redefines both hierarchy and causality theories in the light of the recent explosion of network approaches to causal reasoning associated with studies on reticulate and macroevolution. Causality theories have often been framed from within a rigid, ladder-like hierarchy theory where the rungs of the ladder represent the different levels, and the elements on the rungs represent the evolving units. Causality then is either defined reductionistically as an upward movement along the strands of a singular hierarchy, or holistically as a downward movement along that same hierarchy. Upward causation theories thereby analyze causal processes in time, i.e. over the course of natural history or phylogenetically, as Darwin and the founders of the Modern Synthesis intended. Downward causation theories analyze causal processes in space, ontogenetically or ecologically, as the current eco-evo-devo schools are evidencing. This work demonstrates how macroevolution and reticulate evolution theories add to the complexity by examining reticulate causal processes in space–time, and the interactional hierarchies that such studies bring forth introduce a new form of causation that is here called reticulate causation. Reticulate causation occurs between units and levels belonging to different as well as to the same ontological hierarchies. This article concludes that beyond recognizing the existence of multiple units, levels, and mechanisms or processes of evolution, also the existence of multiple kinds of evolutionary causation as well as the existence of multiple evolutionary hierarchies needs to be acknowledged. This furthermore implies that evolution is a pluralistic process divisible into different kinds. (shrink)

This article investigates the relation between machine and ecology, and the philosophical and historical questions concealed in these two seemingly incompatible terms. The opposition between machin...

The homologies of process within morphogenetic fields provide some of the best evidence for evolution—just as skeletal and organ homologies did earlier. Thus, the evidence for evolution is better than ever. The role of natural selection in evolution, however, is seen to play less an important role. It is merely a filter for unsuccessful morphologies generated by development. Population genetics is destined to change if it is not to become as irrelevant to evolution as Newtonian mechanics is to contemporary physics. (...) (Gilbert, Opitz, and Raff 1996, 368). (shrink)

This essay synthesizes the place of biological evolutionism in the early history of psychoanalysis, and shows the implicit significance of German Darwinism in Sigmund Freud’s whole psychoanalytical works. In particular, Freud, together with Sándor Ferenczi (1873–1933), applied to mental disorders hypotheses inspired by August Pauly’s (1850–1914) psychological Lamarckism and Ernst Heckel (1834–1919) theory of recapitulation. Both of these theories rested upon the principle of inheritance of acquired characteristics, and were disproved by biological discoveries during the interwar period. However, despite these (...) scientific progresses, Freud never gave up his idea of inherited unconscious memories, and we try here to sketch out what would have cost him a renunciation to such outdated biological principles. Notwithstanding, Sigmund Freud was the first to elaborate on evolutionary causes of mental syndromes, which makes of him the forerunner of current neo-Darwinian psychopathology, with few continuators to date within the psychoanalytic field. Nowadays, the extended neo-Darwinian synthesis and affective neuroscience may pave the way for a rational Darwinian approach to human mental disorders, which would take into account the whole neurological and psychological evolution of species, and be centered on emotions and their vicissitudes. (shrink)

This paper examines Karl Alfred von Zittel’s practice in order to uncover the roots of so-called idiographic paleontology. The great American paleontologist Stephen Jay Gould (1941–2002) defined the discipline of idiographic paleontology as illustration and description of the morphological features of extinct species. However, this approach does not investigate macroevolutionary patterns and processes. On the contrary, the paleobiological revolution of the 1970s implemented an epistemic methodology that illustrates macrovelutionary patterns and laws by combining idiographic data with a nomothetic form of (...) explanation. This article elucidates the features of the idiographic data as well as the acquired knowledge coupled with this approach. First of all, Heinrich G. Bronn’s (1800–1862) statistical method is analyzed. Zittel’s practice arose as a reaction against the approximate conclusions reached by Bronn’s quantitative approach. Second, the details of Zittel’s methodology are described in order to bring out its peculiarities. The microscope played a pivotal role in creating and forming Zittel’s morphological data. This analysis sheds new light on the reasons behind the so-called ideographic paleontology, thus revising Gould’s historical reconstruction, as well as on the notion of paleontological data. However, even though Zittel aimed at reaching precise and stable conclusions, his data cannot be used for elucidating evolutionary mechanisms: they are scientific in a purely descriptive sense, but completely useless for biological investigations. Finally, this paper examines how Zittel’s methodology affects the contemporary paleobiological enterprise and thereby reflects upon the notion of natural history. (shrink)

During the early twentieth century, the Swiss Zoologist Adolf Naef (1883–1949) established himself as a leader in German comparative anatomy and higher level systematics. He is generally labeled an ‘idealistic morphologist’, although he himself called his research program ‘systematic morphology’. The idealistic morphology that flourished in German biology during the first half of the twentieth century was a rather heterogeneous movement, within which Adolf Naef worked out a special theoretical system of his own. Following a biographical sketch, we present an (...) English translation of a previously unpublished typescript from Naef’s estate, which Naef intended as the introduction to a textbook on Comparative Anatomy for which he was unable to find a publisher before his sudden death in 1949. The typescript contains Naef’s mature thoughts with unprecedented conciseness, focus, and clarity. The density of Naef’s text warrants a historical and contextual explication of its content. (shrink)

To some, a misguided Lamarckian and a fraud, to others a martyr in the fight against Darwinism, the Viennese zoologist Paul Kammerer (1880-1926) remains one of the most controversial scientists of the early 20th century. Here his work is reconsidered in light of turn-of-the-century problems in evolutionary theory and experimental methodology, as seen from Kammerer's perspective in Vienna. Kammerer emerges not as an opponent of Darwinism, but as one would-be modernizer of the 19th-century theory, which had included a role for (...) the inheritance of acquired characteristics. Kammerer attempted a synthesis of Darwinism with genetics and the chromosome theory, while retaining the modifying effects of the environment as the main source of favorable variation, and he developed his program of experimentation to support it. Kammerer never had a regular university position, but worked at a private experimental laboratory, with sidelines as a teacher and a popular writer and lecturer. On the lecture circuit he held forth on the significance of his science for understanding and furthering cultural evolution and he satisfied his passion for the arts and performance. In his dual career as researcher and popularizer, he did not always follow academic convention. In the contentious and rapidly changing fields of heredity and evolution, some of his stances and practices, as well as his outsider status and part-Jewish background, aroused suspicion and set the stage for the scandal that ended his career and prompted his suicide. (shrink)

Do trees of life have roots? What do these roots look like? In this contribution, I argue that research on the origins of life might offer glimpses on the topology of these very roots. More specifically, I argue (1) that the roots of the tree of life go well below the level of the commonly mentioned ‘ancestral organisms’ down into the level of much simpler, minimally living entities that might be referred to as ‘protoliving systems’, and (2) that further below, (...) a system of roots gradually dissolves into non-living matter along several functional dimensions. In between non-living and living matter, one finds physico-chemical systems that I propose to characterize by a ‘lifeness signature’. In turn, this ‘lifeness signature’ might also account for a diverse range of biochemical entities that are found to be ‘less-than-living’ yet ‘more-than-non-living’. (shrink)

The study of microbial phylogeny and evolution has emerged as an interdisciplinary synthesis, divergent in both methods and concepts from the classical evolutionary biology. The deployment of macromolecular sequencing in microbial classification has provided a deep evolutionary taxonomy hitherto deemed impossible. Microbial phylogenetics has greatly transformed the landscape of evolutionary biology, not only in revitalizing the field in the pursuit of life’s history over billions of years, but also in transcending the structure of thought that has shaped evolutionary theory since (...) the time of Darwin. A trio of primary phylogenetic lineages, along with the recognition of symbiosis and lateral gene transfer as fundamental processes of evolutionary innovation, are core principles of microbial evolutionary biology today. Their scope and significance remain contentious among evolutionists. (shrink)

When data are limited, simple models of complex ecological systems tend to wind up closer to the truth than more complex models of the same systems. This greater proximity to the truth, or verisimilitude, leads to greater predictive success. When more data are available, the advantage of simplicity decreases, and more complex models may gain the upper hand. In ecology, holistic models are usually simpler than reductionistic models. Thus, when data are limited, holistic models have an advantage over reductionistic models, (...) with respect to verisimilitude and predictive success. I illustrate these points with models designed to explain and predict the numbers of species on islands. (shrink)

Methoden. Im obigen Artikel ist die „Phylogenie des Stammbaumes” untersucht worden. Beginnend mitHaeckel werden 26 Typen phylogenetischer Symbole kritisch besprochen, d.h. nicht die Resultate, sondern nur die Methoden, z.B. bezüglich Systematik und Phylogenie, lebender und ausgestorbener Organismen, geologischer Perioden, Stufen und homologer Variationen, geographischer Verbreitung, Diversität, etwaiger Bedeutung der Einzelheiten, Mono-, Bi- und Polyrheithrie , usw. Der Faktor Zeit wird dabei für phylogenetische Systeme als der wesentlichste betrachtet. Der Autor hat daher in seinen- neuen Darstellungen die Begriffe „Zeit-Stufen” oder „Zeit-Globen-Oberflächen” (...) eingeführt; diese stehen senkrecht zum „Zeit-Radius”. Auf diesem Grunde wird ein neues Kriterium zur Unterscheidung systematischer und phylogenetischer Vorstellungen denjenigen anderer Autoren hinzugefügt. Erläuterungen. Nach einer Übersicht über die besprochenen Schemen im 1. Teil werden die Verhältnisse zwischen systematischen und phylogenetischen Darstellungen sowie die Verbindung ihrer Symbole untersucht. Es wird gezeigt, dass viele Einzelheiten solcher Konstruktionen oft, wissentlich oder unwissentlich, keine bestimmte Bedeutung haben. Der Verfasser hat versucht zu zeigen, dass es erwünscht wäre, möglichst mit allen Einzelheiten einer symbolischen Darstellung irgendeine Bedeutung zu verbinden: Linien und Entfernungen in der Ebene, Winkel in räumlichen Schemen. Die letztgenannten werden besonders für solche Arten von phylogenetischen Systemen empfohlen, bei denen der Faktor Zeit stets eine der Dimensionen bildet. Dieser Grundsatz wird mit der Evolution systematischer Einzelheiten in Verbindung gebracht, und Merkmals-Phyletik, homologe Variationen, Stufen, Polyrheithrie, Analogie und Homologie, Konvergenz und Verwandtschaft, etc. werden kurz im Lichte der Vererbungslehre besprochen. Es istHayata's extrem dynamischen Ansichten zu verdanken, dass das Statische in den systematischen und phylogenetischen Darstellungen aufgelockert worden ist. Méthodes. Dans l'article inséré ci-dessus il s'agit de ce qu'on pourrait appeler „la phylogénie de l'arbre généalogique”. En commençant parHaeckel , l'auteur discute 26 types divers de symboles phylogénétiques, c.à.d. seulement les méthodes , par exemple en ce qui concerne la taxonomie et la phylogénie, les organismes récents et éteints, les périodes géologiques, les niveaux et les variations homologues, la distribution géographique, la diversité, la signification éventuelle des détails, la mono-, bi- et polyrheithrie , etc. Le Temps est considéré comme l'élément le plus essentiel dans tout système phylogénétique. Par conséquence, l'auteur a introduit dans ses nouvelles représentations les idées de „Niveaux” ou de „Surfaces des Sphères du Temps” qui sont imaginés perpendiculaires au Radius-Temps. Dans l'ordre de ces idées un nouveau critère est ajouté à ceux donnés par d'autres auteurs pour la distinction des systèmes taxonomiques et des représentations phylogénétiques. Justifications. Après une récapitulation des systèmes, énumérés dans la première partie, les relations des constructions taxonomiques et phylogénétiques, ainsi que les connections de leurs symboles sont discutées. Souvent plusieurs détails sont, sciemment ou insciemment, dépourvus de toutes signification. L'auteur a essayé de démontrer qu'il serait désirable d'attribuer autant que possible de significations définies au détails d'une représentation symbolique de la nature décrite: aux lignes et aux distances dans le plan, aux angles dans l'espace. Les constructions tridimensionales sont particulièrement recommandées pour plusieurs systèmes phylogénétiques; dans de tels systèmes le Temps devrait toujours remplir la fonction d'une des dimensions. Ce principe est mis en rapport avec l'évolution des unités taxonomiques; phylogénie des charactères, variations homologues, niveaux, polyrheithrie, analogie et homologie, convergence et relations héréditaires, tous ces sujets sont brièvement discutés dans leurs rapports avec la Génétique. Selon l'opinion de l'auteur, c'est aux idées ultra-dynamiques d'Hayata que la taxonomie et la phylogénie doivent la pénétration féconde du dynamisme dans leurs systèmes trop souvent statiques. (shrink)

Editors' introduction to the special issue on homology (Biology and Philosophy Vol. 22, Issue 5, 2007).

The field of the philosophy of biology is flourishing in its aim to evaluate and rethink the view inherited from the previous century ---the Modern Synthesis. Different research areas and theories have come to the fore in the last decades in order to account for different biological phenomena that, in the first instance, fall beyond the explanatory scope of the Modern Synthesis. This thesis is anchored and motivated by this revolt in the philosophy of biology. -/- The central target in (...) this context is the possibility of naturalizing teleology, a classical nightmare for the history of biology itself. This requires, principally, understanding the causes of teleological explanations without assuming an unfashioned backward causation of sorts. As the riddles of teleological explanations are about their temporal dimension, I analyze different temporal scales of biological processes: evolutionary, developmental, and physiological. -/- The first one is the one defended in the context of the Modern Synthesis. As expected, one of the aims of this thesis is to evaluate the adequacy of an evolutionary account of teleological explanation. The scrutiny is negative. Evolutionary explanations in the context of the Modern Synthesis lack the necessary causal roots to naturalize teleology. Concerning the physiological scale, a long tradition pushed up by Kant and the organicist movement in the 20th century allows us to better understand how teleological explanations can be naturalized in physiological process. The key notions in this temporal scale are self-organization and the recursive, looped character of physiological process. While the physiological scale may be suitably accounted by contemporaries views, such as Autonomous Systems Theory, different central teleological phenomena remain unexplained from a purely physiological perspective. In particular, different issues concerning the (adaptive) construction of organism ---such as plasticity, robustness, variation, novelty, inheritance--- deserve an ontogenetic analysis. -/- The principal aim of this thesis is to provide a theory of teleological development that falls beyond the Modern Synthesis' framework and is prompted by different insights from the history of biology. I call it Agential Teleosemantics. It rests on two central pillars. First, that developmental processes, beyond any gene-centered stance, can be understood in informational terms; i.e. developmental processes are about the interaction of developmental resources conveying biological information. The second ingredient is agentivity, namely the idea that development is regulated by an agentive system according to the adaptiveness of the phenotypic outcomes produced. The role of agency in Agential Teleosemantic is equivalent to the role of genes in the Modern Synthesis: it is responsible for explaining the order and the adaptive complexity in the living realm. -/- The second target of this thesis regards the possibility of naturalizing intentional explanations in cognitive science. The central project involved in such an aim is known as teleosemantics. Classical teleosemantics however is etiological: it explains the teleofunctions of representational systems in terms of evolutionary processes. The different disputes in the contemporary philosophy of biology provide two insights to analyze teleosemantics in cognitive science. First, the challenges against the Modern Synthesis must be extended to the evolutionary approach of etiological teleosemantics. Second, as Agential Teleosemantics suggests an alternative source for teleofunctions ---ontogeny, I offer an attempt to integrate Agential Teleosemantics into cognitive science in order to provide an alternative teleosemantic project to understand intentional explanations in cognitive science. (shrink)

Advances in developmental genetics and evo-devo in the last several decades have enabled the growth of novel developmental approaches to the classic theme of homology. These approaches depart from the more standard phylogenetic view by contending that homology between morphological characters depends on developmental-genetic individuation and explanation. This article provides a systematic re-examination of the relationship between developmental and phylogenetic homology in light of current evidence from developmental and evolutionary genetics and genomics. I present a qualitative model of the processes (...) that cause de-coupling of morphological and molecular evolution by developmental system drift (DSD), and hypothesize that DSD is a widespread and regular stochastic process that is predictable from parameters such as population size, pleiotropy, and regulatory redundancy. These theoretical findings support an integrative approach in which models of DSD aid in determining when developmental-genetic explanations of homology apply and when other explanations such as stabilizing selection are needed. I argue that a phylogenetic monism about the definition and criteria of homology supports the integration of different explanations into a theory of homology better than pluralism does. (shrink)

The paper presents analysis of form in different domains. It draws on the commonalities and their potential unified classifications based on how forms subjectively appear in perception—as opposed to their standard specification in Euclidean geometry or other objective quantitative methods. The paper provides an overview aiming to offer elements for thought for researchers in various fields.

ArgumentIn his inaugural lecture, “On the Legitimacy of the Darwinian Theory,” August Weismann followed closely in Darwin's footsteps, but provided at the same time an outline of the essentials of his future theory of heredity, development, variation, and speciation. This was Weismann's first support of the evolutionary theory, and it shows his commitment to natural selection as the mechanism of evolution. For Weismann, “Darwin's Theory” meant natural selection. Natural selection, and more generally selectionism, became Weismann's major explanatory principle for evolutionary (...) change and the most important element driving his thought. (shrink)

The German synthesis of evolutionary theory that grew out of opposition to idealistic morphology has been anchored in the systematic work at the species level and below pursued by the Berlin School around Erwin Stresemann (involving Bernhard Rensch and Ernst Mayr), in the 1939 German translation of Dobzhansky’s Genetics and the Origin of Species, and in a 1943 anthology on evolution edited by Gerhard Heberer. The latter volume opened with a philosophical essay written by Hugo Dingler that was intended to (...) provide the theoretical foundation for the theory of descent. Dingler and Heberer not only shared a commitment to the Darwinian evolutionary mechanisms of random mutation and natural selection, but also drew from Darwinism the justification for racial hygiene and eugenics. Dingler’s “unequivocal-methodological system” is a meta-scientific construct that offers no ontological grounding of evolutionary theory. Dingler’s voluntarism is subjectivist and stipulative and for those reasons ineffective in a critique of idealistic morphology. Dingler claimed descent with modification as a historical fact, but dealt only marginally with evolutionary mechanisms, and did not touch on issues of phylogeny reconstruction. (shrink)

Observational and experimental discoveries of new factual entities such as objects, systems, or processes, are major contributors to some advances in the life sciences. Yet, whereas discovery of theories was extensively deliberated by philosophers of science, very little philosophical attention was paid to the discovery of factual entities. This paper examines historical and philosophical aspects of the experimental discovery by Carl Woese of archaea, prokaryotes that comprise one of the three principal domains of the phylogenetic tree. Borrowing Kuhn’s terminology, this (...) discovery of a major biological entity was made during a ‘normal science’ project of building molecular taxonomy for prokaryotes. Unexpectedly, however, an observed anomaly instigated the discovery of archaea. Substantiation of the existence of the new archaeal entity and consequent reconstruction of the phylogenetic tree prompted replacement of a long-held model of a prokarya and eukarya bipartite tree of life by a new model of a tripartite tree comprising of bacteria, archaea, and eukarya. This paper explores the history and philosophical implications of the progression of Woese’s project from normal science to anomaly-instigated model-changing discovery. It is also shown that the consequential discoveries of RNA splicing and of ribozymes were similarly prompted by unexpected irregularities during normal science activities. It is thus submitted that some discoveries of factual biological entities are triggered by unforeseen observational or experimental anomalies. (shrink)

This paper offers a renewed construction grammar analysis of linguistic constructions in a diachronic perspective. The present theory, termedAgentive Cognitive Construction Grammar(AgCCxG), is informed byactive inference(AIF), a process theory for the comprehension of intelligent agency. AgCCxG defends the idea that language bear traces of non-linguistic, bodily-acquired information that reflects sémiotico-biological processes of energy exchange and conservation. One of the major claims of the paper is that embodied cognition has evolved to facilitate ontogenic mental alignment among humans. This is demonstrated by (...) the results of a corpus study in which the patterns of association between verbs, the particle UP and argument structure in Old and Middle English have been studied. The conclusion is that, similar to biological systems, the linguistic sign system displays patterns of equilibrium and non-equilibrium. In other words, while in Old English usage near equilibrium was reached through the use of a conservative set of constructional semiotic templates (attachment patterns), associated with motor modalities, Middle English displays high rates of randomness resulting in a less stable, yet distinct, system of constructional attachment. (shrink)

Phylogenetic models traditionally represent the history of life as having a strictly-branching tree structure. However, it is becoming increasingly clear that the history of life is often not strictly-branching; lateral gene transfer, endosymbiosis, and hybridization, for example, can all produce lateral branching events. There is thus motivation to allow phylogenetic models to have a reticulate structure. One proposal involves the reconciliation of genealogical discordance. Briefly, this method uses patterns of disagreement – discordance – between trees of different genes to add (...) lateral branching events to phylogenetic trees of taxa, and to estimate the most likely cause of these events. I use this practice to argue for: (1) a need for expanded accounts of multiple-models idealization, (2) a distinction between automatic and manual de-idealization, and (3) recognition that idealization may serve the meso-level aims of science in a different way than hitherto acknowledged. (shrink)

Many philosophers have become familiar with Leopold’s land ethic through the writings of J. Baird Callicott, who claims that Leopold bases his land ethic on a ‘protosociobiological’ argument that Darwin gives in the Descent of Man. On this view, which has become the canonical interpretation, Leopold’s land ethic is based on extending our moral sentiments to ecosystems. I argue that the evidence weighs in favor of an alternative interpretation of Leopold; his reference to Darwin does not refer to the Descent, (...) but rather to the Origin of Species, where Darwin discusses the interdependencies between organisms in the struggle for existence. (shrink)

The sciences of ethology and sociobiology have as premisses that certain dispositions and behavioural patterns have evolved with species and, therefore, that the acts of individual animals and men must be viewed in light of innate determinates. These ideas are much older than the now burgeoning disciplines of the biology of behaviour. Their elements were fused in the early constructions of evolutionary theory, and they became integral parts of the developing conception. Historians, however, have usually neglected close examination of the (...) role behaviour has played in the rise of evolutionary thought. (shrink)

The Strange Situation procedure was developed by Ainsworth two decades agoas a means of assessing the security of infant-parent attachment. Users of the procedureclaim that it provides a way of determining whether the infant has developed species-appropriate adaptive behavior as a result of rearing in an evolutionary appropriate context, characterized by a sensitively responsive parent. Only when the parent behaves in the sensitive, species-appropriate fashion is the baby said to behave in the adaptive or secure fashion. Furthermore, when infants are (...) observed repeatedly in the Strange Situation,the pattern of behavior is said to be highly similar, and this pattern is said to predict the infants' future behavior in a diverse array of contexts. After an exhaustive review of the literature, it is shown that these popular claims are empirically unsupported in their strong form, and that the interpretations in terms of biological adaptationare misguided. There is little reliable evidence about the specific dimensions of parental behavior that affect Strange Situation behavior, although there does appear to be some relationship between these constructs. Temporal stability in security of attachment ishigh only when there is stability in family and caretaking circumstances. Likewise, patterns of Strange Situation behavior only have substantial predictive validity in similarly stable families. Implications for future research and theorizing — particularly as they relate to the use of evolutionary biology in psychological theory — are discussed. (shrink)

The evolution of development can be made accessible to study by exploiting closely related species that exhibit distinct ontogenies. The direct‐developing sea urchin Heliocidaris erythrogramma is closely related to indirect‐developing sea urchins that develop via a feeding larval stage. Superficial consideration would suggest that simple heterochronies resulting in loss of larval features and acceleration of adult features could explain the substitution of direct for indirect development. However, our experiments show that early development has in fact been extensively remodeled, with modified (...) localization of maternal determinants coupled with dissociation of cell cleavage from axis formation resulting in novel patterns of cell lineage differentiation and fate map. Gene expression has undergone concomitant changes. (shrink)

Critical realism, especially as developed by Roy Bhaskar, embodies at its heart systemic and holistic concepts such as totality, emergence, open systems, stratification, autopoiesis and holistic causality. These concepts have their own long history of development in disciplines such as systems thinking and cybernetics, but there is an absence in Bhaskar’s writings, and that absence is a lack of any reference to the corresponding systems literature. The purpose of this paper is threefold: (i) to demonstrate the extent of this correspondence; (...) (ii) to show that critical realism can benefit from an exposure to these other discourses; and (iii) to show that systems thinking too can gain philosophically from critical realism. (shrink)

A term of relatively recent mintage, coined by German scientist Ernst Haeckel in 1866, ecology draws on ancient Greek to establish and consolidate its meaning. Although scholars all too often overlook it, the anachronistic rise of ecology in its semantic and conceptual determinations is noteworthy. Formed by analogy with economy, the word may be translated as “the articulation of a dwelling”, the logos of oikos. Here, I argue not only that a vast majority of ecosystems on the planet are subject (...) to environmental upheavals and ecological crises, but also that ecology as the crossroads of dwelling and articulation is in crisis, having come into its own and made explicit what was silently present in its historical enunciation. As a result, ecology needs to be deromanticized, decoupled from the bucolic and the picturesque, and dissociated from nativism and autochthony. Every organism, ecosystem, or place is affected by the forces of unsettlement and displacement; all dwellings and their articulations are shaken to the core and set in motion, rendering ecologies exilic. Ecologies today share the exilic condition, which also threatens to level the differences among them, without the chance of returning to a stable origin, itself nothing other than a theoretical fiction. In what follows, I propose to chalk out the outlines of exilic ecologies. (shrink)

Evolutionary biologists, evolutionary epistemologists, and biosemioticians have demonstrated that organisms not merely adapt to an external world, but that they actively construct their environmental, sociocultural, and cognitive niches. Denis Noble demonstrates that such is no different for those organisms that engage in science, and he lays bare several crucial assumptions that define the scientific dogmas and practices of evolutionary biology.

With Carl Gegenbaur and Ernst Haeckel, inspiredby Darwin and the cell theory, comparativeanatomy and embryology became established andflourished in Jena. This tradition wascontinued and developed further with new ideasand methods devised by some of Haeckelsstudents. This first period of innovative workin evolutionary morphology was followed byperiods of crisis and even a disintegration ofthe discipline in the early twentieth century.This stagnation was caused by a lack ofinterest among morphologists in Mendeliangenetics, and uncertainty about the mechanismsof evolution. Idealistic morphology was stillinfluental in (...) Germany, which prevented a fullappreciation of the importance of Darwinstheory of natural selection for comparativemorphology. Evolutionary morphology andembryology failed to contribute significantlyto the modern synthesis of evolutionarybiology, thereby probably delaying theintegration of developmental biology intomodern evolutionary biology. However, Haeckelsstudent Oscar Hertwig, as well as Victor Franzand Alexej N. Sewertzoff from a youngergeneration, all tried to forge their ownsynthetic approaches in which (inspired byHaeckels work) embryology played an importantrole. Important for all three researchers wereattempts to refine, and sometimes redefine, thebiogenetic law, and to find new scientificexplanations for it (and for the manyexceptions to it). Their research was latermore or less forgotten, and had littleinfluence on the architects of the modernsynthesis. As the relationship betweenevolutionary and developmental biology is nowagain rising in importance in the form ofEvo-Devo, we would like to draw attention tohow this earlier research tradition grappledwith similar questions to those now on theagenda, albeit from sometimes quite differentperspectives. (shrink)

After a short review of the historical development of the problem of cytoplasmic inheritance, the principles for the proof of cytoplasmic inheritance were discussed. At present the proof can be based on the maternal transmission of plasmagenes, on the missing of mendelian segregation and on the possibility of a segregation during ontogenetic development. In the following the most important possibilities for errors and their refutation onEpilobium were discussed: elimination of genotypes , abnormal cytology , maternal aftereffects , predetermination , nuclear (...) produced plasmagenes and transmission of parasites or symbionts as virus . At the end the principles for the distinction between different cytoplasmic constituents were discussed. (shrink)

Traditionally defined as the science of the living, or as the field that beyond anatomical structure and bodily form studies functional organization and behaviour, physiology has long been excluded from evolutionary research. The main reason for this exclusion is that physiology has a presential and futuristic outlook on life, while evolutionary theory is traditionally defined as the study of natural history. In this paper, I re-evaluate these classic science divisions and situate physiology within the history of the evolutionary sciences, as (...) well as within debates on the Extended Evolutionary Synthesis and the need for a Third Way of Evolution. I then briefly point out how evolutionary physiology in particular contributes to research on function, causation, teleonomy, agency and cognition. (shrink)