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Contrasting the general with the particular in phylogenetics - a proposal to keep the meanings of mono/paraphyletic and clade/grade separated
Södertörns högskola, Institutionen för livsvetenskaper. Muséum National d'Histoire Naturelle, Paris, France / Göteborgs universitet.
2008 (Engelska)Ingår i: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 57, nr 3, s. 705-708Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Clade and monophyletic group on one hand and grade and paraphyletic group on the other hand are commonly used as pairs of interchangeable terms. I question this apparent synonymy and propose that "monophyly" and "paraphyly" should refer to a property of a set, whereas "clade" and "grade" should apply to individuals resulting from evolutionary process.

Ort, förlag, år, upplaga, sidor
2008. Vol. 57, nr 3, s. 705-708
Nationell ämneskategori
Evolutionsbiologi
Identifikatorer
URN: urn:nbn:se:sh:diva-14140DOI: 10.1002/tax.573003ISI: 000258974600003Scopus ID: 2-s2.0-52249108872OAI: oai:DiVA.org:sh-14140DiVA, id: diva2:467037
Tillgänglig från: 2011-12-18 Skapad: 2011-12-16 Senast uppdaterad: 2023-09-21Bibliografiskt granskad
Ingår i avhandling
1. Relationships between nomenclature, phylogenetics and systematics
Öppna denna publikation i ny flik eller fönster >>Relationships between nomenclature, phylogenetics and systematics
2008 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Systematists have become increasingly aware of the limits imposed by the current system of nomenclature for accurately representing evolutionary relationships and managing efficiently names associated with clades. In reaction, a new system of nomenclature, the PhyloCode is being developed that fully recognizes the historical nature of taxonomy and the importance of the cladistics revolution. As a consequence, questions emerge about the new historical entities of systematics, questions that can be apprehended through the lens of epistemology, philosophy of language and metaphysics. What is the ontological nature of entities that lack any other essential features besides spatiotemporal properties? How to depart from the fixed realm of immutable and transcendental essence into a worldview wherein all biological entities are characterized by their temporality and materiality? What are the consequences of nomenclatural decisions on other sectors of biology? With the ever growing sequencing capacity and tree reconstructing abilities, our conceptualization of phylogenetic relationships is changing at an unprecedented pace. Then it begs the question, what prevents communication break down when the references of clades’ names are changing almost on a daily basis. These are some of the fundamental issues I am tackling in the present work. Addressing the ontological issue, I argue that species and clades are best perceived as mereological sums of individuals, which means that each biological individual is the unique individual composed of all its less inclusive individuals and nothing more. I propose to separate the meanings of “clade” and “monophyletic group”. I suggest to use “monophyletic” for an epithet referring to a defining property of a set (a natural kind) and “clade” for a noun which corresponds to a historical entity (an individual) resulting from evolutionary process. I present the idea that a phyloname is not attached to a single clade but to a natural kind containing as members the clades that would be selected in counterfactual phylogenies. The defining properties of this natural kind are provided by the phylogenetic definition. Finally I stress that taxonomists are also driven by the will to narrate the same sort of history, when they adjust the reference of names in light of new phylogenetic data, which leads me to submit that taxa can also be perceived as narratives.

Ort, förlag, år, upplaga, sidor
Göteborg: Göteborgs universitet, 2008. s. 44
Nyckelord
PhyloCode, philosophy, systematics, individuality, natural kind, possible worlds, causal theory of reference
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
urn:nbn:se:sh:diva-31241 (URN)978-91-628-7544-2 (ISBN)
Disputation
2008-09-26, Föreläsningssalen, Department of Zoology, Medicinaregatan 18, Göteborg, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2016-11-29 Skapad: 2016-11-29 Senast uppdaterad: 2016-11-29Bibliografiskt granskad

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Bertrand, Yann

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