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  1. How Are Biology Concepts Used and Transformed?Ingo Brigandt - forthcoming - In Philosophy of Science for Biologists. Cambridge University Press.
  2. Species as Models.Jun Otsuka - forthcoming - Philosophy of Science.
    This paper argues that biological species should be construed as abstract models, rather than biological or even tangible entities. Various species concepts are defined as set-theoretic models of formal theories, and their logical connections are illustrated. In this view organisms relate to a species not as instantiations, members, or mereological parts, but rather as phenomena to be represented by the model/species. This sheds new light on the long-standing problems of species and suggests their connection to broader philosophical topics such as (...)
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  3. Descent and Logic in Biosystematics.Thomas McCabe (ed.) - 2021 - Juneau: Perseverant Publishing.
    Descent and Logic in Biosystematics is a short multidisciplinary book about biological systematics and taxonomy. Some of the subjects covered in it are philosophical---taxonomic theory, species concepts, speciation models, and evolutionary theories. Yet the book also covers matters not philosophical, such as taxonomic operations, experimental taxonomy, and two new suggested taxonomic methods, with worked examples. The author finds relationships among these topics. The book is addressed to both working taxonomists, and to philosophers with an interest in biology. It will also (...)
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  4. In Defence of Taxonomic Governance.Stijn Conix - 2019 - Organisms, Diversity and Evolution 19 (2):87-97.
    It is well known that taxonomists rely on many different methods and criteria for species delimitation, leading to different kinds of groups being recognised as species. While this state of relative disorder is widely acknowledged, there is no similar agreement about how it should be resolved. This paper considers the view that the disorder in species classification should be resolved by a system of taxonomic governance. I argue that such a system of governance is best seen as a combination of (...)
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  5. Measuring Evolutionary Independence: A Pragmatic Approach to Species Classification.Stijn Conix - 2019 - Biology and Philosophy 34 (6):1-18.
    After decades of debates about species concepts, there is broad agreement that species are evolving lineages. However, species classification is still in a state of disorder: different methods of delimitation lead to competing outcomes for the same organisms, and the groups recognised as species are of widely different kinds. This paper considers whether this problem can be resolved by developing a unitary scale for evolutionary independence. Such a scale would show clearly when groups are comparable and allow taxonomists to choose (...)
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  6. Crossed Tracks: Mesolimulus, Archaeopteryx, and the Nature of Fossils.Leonard Finkelman - 2019 - Biology and Philosophy 34 (2):28.
    Organisms leave a variety of traces in the fossil record. Among these traces, vertebrate and invertebrate paleontologists conventionally recognize a distinction between the remains of an organism’s phenotype and the remains of an organism’s life activities. The same convention recognizes body fossils as biological structures and trace fossils as geological objects. This convention explains some curious practices in the classification, as with the distinction between taxa for trace fossils and for tracemakers. I consider the distinction between “parallel taxonomies,” or parataxonomies, (...)
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  7. Species in the Age of Discordance.Matthew H. Haber - 2019 - Philosophy, Theory, and Practice in Biology 11 (21).
    Biological lineages move through time, space, and each other. As they do, they diversify, diverge, and grade away from and into one another. One result of this is genealogical discordance; i.e., the lineages of a biological entity may have different histories. We see this on numerous levels, from microbial networks, to holobionts, to population-level lineages. This paper considers how genealogical discordance impacts our study of species. More specifically, I consider this in the context of three framing questions: (1) How, if (...)
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  8. Biological Classification: A Philosophical Introduction. [REVIEW]Justin Bzovy - 2018 - Philosophical Quarterly 68 (271):400-403.
    © The Author 2017. Published by Oxford University Press on behalf of The Scots Philosophical Association and the University of St Andrews. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com...Richard A. Richards offers a comprehensive introduction to biological classification: ‘the comparison and grouping of organisms, the naming of these groups, the theoretical basis for grouping, and the philosophical foundations for systems of grouping’. This book functions as an introduction to philosophy for biologists, an introduction to biology for philosophers and an (...)
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  9. Integrative Taxonomy and the Operationalization of Evolutionary Independence.Stijn Conix - 2018 - European Journal for Philosophy of Science 8 (3):587-603.
    There is growing agreement among taxonomists that species are independently evolving lineages. The central notion of this conception, evolutionary independence, is commonly operationalized by taxonomists in multiple, diverging ways. This leads to a problem of operationalization-dependency in species classification, as species delimitation is not only dependent on the properties of the investigated groups, but also on how taxonomists choose to operationalize evolutionary independence. The question then is how the operationalization-dependency of species delimitation is compatible with its objectivity and reliability. In (...)
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  10. De-Extinction and the Conception of Species.Leonard Finkelman - 2018 - Biology and Philosophy 33 (5-6):32.
    Developments in genetic engineering may soon allow biologists to clone organisms from extinct species. The process, dubbed “de-extinction,” has been publicized as a means to bring extinct species back to life. For theorists and philosophers of biology, the process also suggests a thought experiment for the ongoing “species problem”: given a species concept, would a clone be classified in the extinct species? Previous analyses have answered this question in the context of specific de-extinction technologies or particular species concepts. The thought (...)
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  11. The Hunting of the SNaRC: A Snarky Solution to the Species Problem.Brent D. Mishler & John S. Wilkins - 2018 - Philosophy, Theory, and Practice in Biology 10 (1).
    We argue that the logical outcome of the cladistics revolution in biological systematics, and the move towards rankless phylogenetic classification of nested monophyletic groups as formalized in the PhyloCode, is to eliminate the species rank along with all the others and simply name clades. We propose that the lowest level of formally named clade be the SNaRC, the Smallest Named and Registered Clade. The SNaRC is an epistemic level in the classification, not an ontic one. Naming stops at that level (...)
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  12. Should We Colonize Other Planets?Adam Morton - 2018 - Cambridge , UK: Polity.
    A critical exposition of plans to colonize other planets , especially Mars, and their costs. The final chapter links with issues about the value and future of human life. See the extended summary uploaded to this site.
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  13. Species: The Evolution of the Idea.John Wilkins - 2018 - Boca Raton: CRC Press.
    Features Covers the philosophical and historical development of the concept of "species" Documents that variation was recognized by pre-Darwinian scholars Includes a section on the debates since the time of the New Synthesis Better suited to non-philosophers Summary Over time the complex idea of "species" has evolved, yet its meaning is far from resolved. This comprehensive work is a fresh look at an idea central to the field of biology by tracing its history from antiquity to today. Species is a (...)
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  14. On the Authenticity of De-Extinct Organisms, and the Genesis Argument.Douglas Ian Campbell - 2017 - Animal Studies Journal 6 (1):61-79.
    Are the methods of synthetic biology capable of recreating authentic living members of an extinct species? An analogy with the restoration of destroyed natural landscapes suggests not. The restored version of a natural landscape will typically lack much of the aesthetic value of the original landscape because of the different historical processes that created it—processes that involved human intentions and actions, rather than natural forces acting over millennia. By the same token, it would appear that synthetically recreated versions of extinct (...)
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  15. Resurrecting Extinct Species Ethics and Authenticity.Douglas Ian Campbell & Patrick Michael Whittle - 2017 - London, UK: Palgrave Macmillan.
    This book is about the philosophy of de-extinction. -/- CHAPTER 1 introduces the two main philosophical questions that are raised by the prospect of extinct species being brought back from the dead—namely, the ‘Authenticity Question’ and the ‘Ethical Question’. It distinguishes the many different types and methods of de-extinction. Finally, it examines the aims of wildlife conservation with a view to whether they are compatible with de-extinction, or not. -/- CHAPTER 2 examines three prime candidates for de-extinction—namely, the aurochs, the (...)
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  16. World to Word: Nomenclature Systems of Color and Species.Tanya Kelley - 2017 - Dissertation, University Of Missouri
    As the digitization of information accelerates, the push to encode our surrounding numerically instead of linguistically increases. The role that language has traditionally played in the nomenclature of an integrative taxonomy is being replaced by the numeric identification of one or few quantitative characteristics. Nineteenth-century scientific systems of color identification divided, grouped, and named colors according to multiple characteristics. Now color identification relies on numeric values applied to spectrographic readings. This means of identification of color lacks the taxonomic rigor of (...)
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  17. Charles Girard: Relationships and Representation in Nineteenth Century Systematics.Aleta Quinn - 2017 - Journal of the History of Biology 50 (3):609-643.
    Early nineteenth century systematists sought to describe what they called the Natural System or the Natural Classification. In the nineteenth century, there was no agreement about the basis of observed patterns of similarity between organisms. What did these systematists think they were doing, when they named taxa, proposed relationships between taxa, and arranged taxa into representational schemes? In this paper I explicate Charles Frederic Girard’s (1822–1895) theory and method of systematics. A student of Louis Agassiz, and subsequently (1850–1858) a collaborator (...)
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  18. Taxonomy for Humans or Computers? Cognitive Pragmatics for Big Data.Beckett Sterner & Nico M. Franz - 2017 - Biological Theory 12 (2):99-111.
    Criticism of big data has focused on showing that more is not necessarily better, in the sense that data may lose their value when taken out of context and aggregated together. The next step is to incorporate an awareness of pitfalls for aggregation into the design of data infrastructure and institutions. A common strategy minimizes aggregation errors by increasing the precision of our conventions for identifying and classifying data. As a counterpoint, we argue that there are pragmatic trade-offs between precision (...)
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  19. A Case for Resurrecting Lost Species—Review Essay of Beth Shapiro’s, “How to Clone a Mammoth: The Science of De-Extinction”.Douglas Campbell - 2016 - Biology and Philosophy 31 (5):747-759.
    The title of Beth Shapiro’s ‘How to Clone a Mammoth’ contains an implicature: it suggests that it is indeed possible to clone a mammoth, to bring extinct species back from the dead. But in fact Shapiro both denies this is possible, and denies there would be good reason to do it even if it were possible. The de-extinct ‘mammoths’ she speaks of are merely ecological proxies for mammoths—elephants re-engineered for cold-tolerance by the addition to their genomes of a few mammoth (...)
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  20. Rethinking Cohesion and Species Individuality.Celso Neto - 2016 - Biological Theory 11 (3):01-12.
    According to the species-as-individuals thesis(hereafter S-A-I), species are cohesive entities. Barker and Wilson recently pointed out that the type of cohesion exhibited by species is fundamentally different from that of organisms (paradigmatic individuals), suggesting that species are homeostatic property cluster kinds. In this article, I propose a shift in how to approach cohesion in the context of S-A-I: instead of analyzing the different types of cohesion and questioning whether species have them, I focus on the role played by cohesion in (...)
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  21. The Species Problem and its Logic: Inescapable Ambiguity and Framework-Relativity.Steven James Bartlett - 2015 - Willamette University Faculty Research Website, ArXiv.Org, and Cogprints.Org.
    For more than fifty years, taxonomists have proposed numerous alternative definitions of species while they searched for a unique, comprehensive, and persuasive definition. This monograph shows that these efforts have been unnecessary, and indeed have provably been a pursuit of a will o’ the wisp because they have failed to recognize the theoretical impossibility of what they seek to accomplish. A clear and rigorous understanding of the logic underlying species definition leads both to a recognition of the inescapable ambiguity that (...)
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  22. Grene and Hull on Types and Typological Thinking in Biology.Phillip Honenberger - 2015 - Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences 50:13-25.
    Marjorie Grene (1910-2009) and David Hull (1935-2010) were among the most influential voices in late twentieth-century philosophy of biology. But, as Grene and Hull pointed out in published discussions of one another’s work over the course of nearly forty years, they disagreed strongly on fundamental issues. Among these contested issues is the role of what is sometimes called “typology” and “typological thinking” in biology. In regard to taxonomy and the species problem, Hull joined Ernst Mayr’s construal of typological thinking as (...)
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  23. John S. Wilkins and Malte C. Ebach: The Nature of Classification: Relationships and Kinds in the Natural Sciences: Palgrave, Macmillan, 2014, Pp., Vii + 197, Price £60/$100.00.Catherine Kendig - 2015 - History and Philosophy of the Life Sciences 37 (4):477-479.
    John Wilkins and Malte Ebach respond to the dismissal of classification as something we need not concern ourselves with because it is, as Ernest Rutherford suggested, mere ‘‘stamp collecting.’’ They contend that classification is neither derivative of explanation or of hypothesis-making but is necessarily prior and prerequisite to it. Classification comes first and causal explanations are dependent upon it. As such it is an important (but neglected) area of philosophical study. Wilkins and Ebach reject Norwood Russell Hanson’s thesis that classification (...)
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  24. Species, Historicity, and Path Dependency.Marc Ereshefsky - 2014 - Philosophy of Science 81 (5):714-726.
    This paper clarifies the historical nature of species by showing that species are path-dependent entities. A species’ identity is not determined by its intrinsic properties or its origin, but by its unique evolutionary path. Seeing that species are path-dependent entities has three implications: it shows that origin essentialism is mistaken, it rebuts two challenges to the species-are-historical-entities thesis, and it demonstrates that the identity of a species during speciation depends on future events.
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  25. Towards a Multidimensional Metaconception of Species.Catherine Kendig - 2014 - Ratio 27 (2):155-172.
    Species concepts aim to define the species category. Many of these rely on defining species in terms of natural lineages and groupings. A dominant gene-centred metaconception has shaped notions of what constitutes both a natural lineage and a natural grouping. I suggest that relying on this metaconception provides an incomplete understanding of what constitute natural lineages and groupings. If we take seriously the role of epigenetic, behavioural, cultural, and ecological inheritance systems, rather than exclusively genetic inheritance, a broader notion of (...)
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  26. Richard A. Richards. The Species Problem: A Philosophical Analysis. New York: Cambridge University Press, 2010. Pp. X+236. $85.00. [REVIEW]Gal Kober - 2014 - Hopos: The Journal of the International Society for the History of Philosophy of Science 4 (1):169-172.
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  27. Origin Essentialism in Biology.Makmiller Pedroso - 2014 - Philosophical Quarterly 64 (254):60-81.
    Kripke argues for origin essentialism, the view that the same individual cannot have multiple origins. Sober hypothesises that Kripke's origin essentialism applies to biological species. This paper shows that Sober's hypothesis fails. Because Kripke's original argument is invalid, it cannot vindicate Sober's proposal. Salmon offers an influential reformulation of Kripke's argument but his argument fails to extend to species: the notion of an individual's origin is too narrow to apply to species, and Salmon's argument rests on a thought experiment that (...)
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  28. Infinite Graphs in Systematic Biology, with an Application to the Species Problem.Samuel A. Alexander - 2013 - Acta Biotheoretica 61 (2):181--201.
    We argue that C. Darwin and more recently W. Hennig worked at times under the simplifying assumption of an eternal biosphere. So motivated, we explicitly consider the consequences which follow mathematically from this assumption, and the infinite graphs it leads to. This assumption admits certain clusters of organisms which have some ideal theoretical properties of species, shining some light onto the species problem. We prove a dualization of a law of T.A. Knight and C. Darwin, and sketch a decomposition result (...)
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  29. The Communication Puzzle of the Species Problem.Yuichi Amitani - 2013 - Annals of the Japan Association for Philosophy of Science 21:1-20.
    The species problem is the longstanding puzzle regarding the nature of species. This paper aims to describe how biologists experience little communication breakdown when they have different conceptions of species. For this purpose, I analyze two debates on species and speciation between Guy Bush and Jerry Coyne & H. Allen Orr. Although they have radically different ideas on species, they experience little communication difficulty. I will argue that this is because they implicitly agreed on the referent of the group of (...)
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  30. The Species Problem: A Philosophical Analysis, by Richard Richards.: Book Reviews. [REVIEW]Makmiller Pedroso - 2013 - Mind 122 (488):1180-1182.
  31. Searching and Classifying.Vasil Penchev - 2013 - In Vera Gancheva & Elizaria Ruskova (eds.), The XVIII century and Europe. Sofia: Унижерситетско издателство "Св. Климент Охридски". pp. 20-25.
    The text discusses Linnaeus’ binominal classification and the idea of mathesis unversalis of Leibniz in the ground of Michel Foucault’s conception of ‘epistema’ as well the connexion of XVIII century’s representation of universal order with viewpoints of Descartes (Rules for the Direction of the Mind) and Kant (The Critique of Pure Reason, The Critique of (the Power of) Judgment).
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  32. Species as Gene Flow Communities: Werner Kunz: Do Species Exist? Principles of Taxonomic Classification.Thomas A. C. Reydon - 2013 - Acta Biotheoretica 61 (4):525-534.
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  33. Are Species Real? An Essay on the Metaphysics of Species.Matthew H. Slater - 2013 - Palgrave-Macmillan.
  34. Phylogeny as Population History.Joel D. Velasco - 2013 - Philosophy, Theory, and Practice in Biology 5:e402.
    The project of this paper is to understand what a phylogenetic tree represents and to discuss some of the implications that this has for the practice of systematics. At least the first part of this task, if not both parts, might appear trivial—or perhaps better suited for a single page in a textbook rather than a scholarly research paper. But this would be a mistake. While the task of interpreting phylogenetic trees is often treated in a trivial way, their interpretation (...)
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  35. Species Ontology in Light of the Debate About the Existence of Laws in Biology.Zdenka Brzović - 2012 - Balkan Journal of Philosophy 4 (2):161-168.
    In this paper I explore how the discussion about the existence of laws in biology, more specifically laws about species taxa, bears on the issue of whether species are kinds or individuals. One of the main arguments offered in favor of the view that species are individuals is that it explains the lack of laws about species taxa, since laws cannot refer to individuals. My aim in this paper is to question the premise that there are no laws about species (...)
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  36. On the Origin of Species Notions and Their Ethical Limitations.Mark Greene - 2011 - In Tom L. Beauchamp & R. G. Frey (eds.), The Oxford Handbook of Animal Ethics. Oxford University Press. pp. 577-602.
    I argue that defenders of general duties of species preservation are faced with an impossible task. I distinguish derivative from non-derivative value and argue that the derivative value of species can yield only limited and contingent duties of preservation. There can be no general duty of species preservation unless all species have non-derivative value. Ongoing controversy over the ’species’ notion has not deterred some from claiming settled authority for whatever notion appears most conducive to their favored account of species value. (...)
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  37. On the Integrated Frameworks of Species Concepts: Mayden's Hierarchy of Species Concepts and de Queiroz's Unified Concept of Species.Naomi Shun-Ichiro - 2011 - Journal of Zoological Systematics and Evolutionary Research 49 (3):177-184.
    Richard L. Mayden and Kevin de Queiroz have devised and developed ‘a hierarchy of species concepts’ and ‘a unified species concept’, respectively. Although their integrated frameworks of species concepts are rather different as to how to integrate the diverse modern concepts of species, the end result is that they are likely to agree on species recognition in nature, because they virtually share the same major components (i.e. evolutionary or lineage concept of species; same way of delimiting species), and have the (...)
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  38. Philosophically Speaking, How Many Species Concepts Are There?John S. Wilkins - 2011 - Zootaxa 2765:58–60.
  39. Specious intrinsicalism.Matthew J. Barker - 2010 - Philosophy of Science 77 (1):73-91.
    Over the last 2,300 years or so, many philosophers have believed that species are individuated by essences that are at least in part intrinsic. Psychologists tell us most folks also believe this view. But most philosophers of biology have abandoned the view, in light of evolutionary conceptions of species. In defiance, Michael Devitt has attempted in this journal to resurrect a version of the view, which he calls Intrinsic Biological Essentialism. I show that his arguments for the resurrection fail, and (...)
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  40. Cohesion, Gene Flow, and the Nature of Species.Matthew J. Barker & Robert A. Wilson - 2010 - Journal of Philosophy 107 (2):59-77.
    A far-reaching and influential view in evolutionary biology claims that species are cohesive units held together by gene flow. Biologists have recognized empirical problems facing this view; after sharpening the expression of the view, we present novel conceptual problems for it. At the heart of these problems is a distinction between two importantly different concepts of cohesion, what we call integrative and response cohesion. Acknowledging the distinction problematizes both the explanandum of species cohesion and the explanans of gene flow that (...)
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  41. Darwin’s Solution to the Species Problem.Marc Ereshefsky - 2010 - Synthese 175 (3):405 - 425.
    Biologists and philosophers that debate the existence of the species category fall into two camps. Some believe that the species category does not exist and the term 'species' should be eliminated from biology. Others believe that with new biological insights or the application of philosophical ideas, we can be confident that the species category exists. This paper offers a different approach to the species problem. We should be skeptical of the species category, but not skeptical of the existence of those (...)
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  42. Species.Marc Ereshefsky - 2010 - Stanford Encyclopedia of Philosophy.
  43. La proliferación de los conceptos de especie en la biología evolucionista.Roberto Torretti - 2010 - Theoria: Revista de Teoría, Historia y Fundamentos de la Ciencia 25 (3):325-377.
    RESUMEN: La biología evolucionista no ha logrado definir un concepto de especie que satisfaga a todos sus colaboradores. El presente panorama crítico de las principales propuestas y sus respectivas dificultades apunta, por un lado, a ilustrar los procesos de formación de conceptos en las ciencias empíricas y, por otro, a socavar la visión parateológica del conocimiento y la verdad que inspiró inicialmente a la ciencia moderna y prevalece aún entre muchas personas educadas. El artículo se divide en dos partes. La (...)
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  44. Species, Genes, and the Tree of Life.Joel D. Velasco - 2010 - British Journal for the Philosophy of Science 61 (3):599-619.
    A common view is that species occupy a unique position on the Tree of Life. Evaluating this claim requires an understanding of what the Tree of Life represents. The Tree represents history, but there are at least three biological levels that are often said to have genealogies: species, organisms, and genes. Here I focus on defending the plausibility of a gene-based account of the Tree. This leads to an account of species that are determined by gene genealogies. On this view, (...)
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  45. Species as Ranked Taxa.David A. Baum - 2009 - Systematic Biology 58 (1):74-86.
    -/- Because species names play an important role in scientific communication, it is more important that species be understood to be taxa than that they be equated with functional ecological or evolutionary entities. Although most biologists would agree that taxa are composed of organisms that share a unique common history, 2 major challenges remain in developing a species-as-taxa concept. First, grouping: in the face of genealogical discordance at all levels in the taxonomic hierarchy, how can we understand the nature of (...)
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  46. Eine Verteidigung des typologischen Artbegriffs.Boris Hennig - 2009 - Philosophia Naturalis 46 (2):251-278.
    The paper demonstrates that the biological species concept that Mayr con- trasts with the typological one in fact presupposes a version of the typological species concept. For one cannot assess whether two living beings are capable of producing offspring without already knowing what would count as off- spring. Therefore, one must know non-relational features of typical offspring of a kind of living beings in order to be able to apply the biological species concept. The typological species concept that is at (...)
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  47. The Theoretical Costs of DNA Barcoding.Monika Piotrowska - 2009 - Biological Theory 4 (3):235-239.
    I begin with a description of the benefits and limits of DNA barcoding as presented by its advocates not its critics. Next, I argue that due to the mutually dependent relationship between defining and delimiting species, all systems of classification are grounded in theory, even if only implicitly. I then proceed to evaluate DNA barcoding in that context. In particular, I focus on the barcoders’ use of a sharp boundary by which to delimit species, arguing that this boundary brings along (...)
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  48. Species and Kinds: A Critique of Rieppel’s “One of a Kind” Account of Species.Thomas A. C. Reydon - 2009 - Cladistics 25 (6):660-667.
    A major issue in philosophical debates on the species problem concerns the opposition between two seemingly incompatible views of the metaphysics of species: the view that species are individuals and the view that species are natural kinds. In two recent papers in this journal, Olivier Rieppel suggested that this opposition is much less deep than it seems at first sight. Rieppel used a recently developed philosophical account of natural kindhood, namely Richard Boyd’s “homeostatic property cluster” theory, to argue that every (...)
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  49. Biometaphysics.Barry Smith - 2009 - In Robin Le Poidevin, Peter Simons, Andrew McGonigal & Ross Cameron (eds.), The Routledge Companion to Metaphysics. Routledge. pp. 537-544.
    While Darwin is commonly supposed to have demonstrated the inapplicability of the Aristotelian ontology of species to biological science, recent developments, especially in the wake of the Human Genome Project, have given rise to a new golden age of classification in which ontological ideas -- as for example in the Gene Ontology, the Cell Ontology, the Protein Ontology, and so forth -- are once again playing an important role. In regard to species, on the other hand, matters are more complex. (...)
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  50. When Monophyly is Not Enough: Exclusivity as the Key to Defining a Phylogenetic Species Concept.Joel D. Velasco - 2009 - Biology and Philosophy 24 (4):473-486.
    A natural starting place for developing a phylogenetic species concept is to examine monophyletic groups of organisms. Proponents of “the” Phylogenetic Species Concept fall into one of two camps. The first camp denies that species even could be monophyletic and groups organisms using character traits. The second groups organisms using common ancestry and requires that species must be monophyletic. I argue that neither view is entirely correct. While monophyletic groups of organisms exist, they should not be equated with species. Instead, (...)
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