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Wyszukujesz frazę "Linnaean rank" wg kryterium: Temat


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Tytuł:
The Phylocode: Beating a dead horse?
Autorzy:
Benton, M J
Powiązania:
https://bibliotekanauki.pl/articles/22908.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
systematics
Phylocode concept
stability
Phylocode name
Linnaean rank
paleontology
Linnaean system
Opis:
The concept of the Phylocode has been evolving for some twenty years, and is supported by Lee and Skinner (2007): I argue against it here. The first issue is stability, and biologists must decide whether they seek rigidity (Phylocode) or flexibility and conservativeness of clade contents (Linnaean codes). Phylocode names for taxa are by definition stable because they are established as labels for clades that are rigidly defined as geometric constructs. But this is not real stability because the species contained within those clades can change dramatically: an example is given where Phylocode practice forces a decision about the name Deinonychosauria, which can contain 20 or 10,000 species depending on which current tree is correct. Linnaean systems offer real stability (= conservativeness + flexibility) where the taxon name can be moved subtly up and down nodes in a tree to keep its association with a particular character or group of species. Proponents of the Phylocode argue that category/rank terms should be dispensed with, and yet they have no need to do this. Everyone accepts that Linnaean ranks are subjective, and yet there is no benefit in abandoning ranks because they have proved to be of such value to users of classifications, and genera and families, for example, act as valuable surrogates for species in large−scale evolutionary and ecological studies. Finally, the Phylocode extends regulation beyond names and their proper use into determining the validity of phylogenetic hypotheses, and this will act as a limit on normal scientific debate.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability, ranks, and the PhyloCode
Autorzy:
Lee, M S Y
Skinner, A.
Powiązania:
https://bibliotekanauki.pl/articles/21963.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Linnaean nomenclature
stability
phylogenetic nomenclature
phylogenetic definition
current code
rank
name
Linnaean system
type
biological nomenclature
Opis:
Current codes of biological nomenclature define taxon names using types and ranks: the type determines the minimal membership of a named taxon, and the rank is supposed to determine its limits. Homo is “the taxon including the type species Homo sapiens that is assigned to the rank of genus”. However, there is no “genus concept” (analogous to a species concept), and thus no way of empirically determining the limits of a particular genus, even in the context of a single agreed phylogeny. The same problems also apply to higher taxa at all other ranks under current codes, leading to great taxonomic instability. All proposed objective criteria for determining membership of taxa at a particular rank (e.g., geological age, genetic divergence) are shown to be problematic. In contrast, the clades named by phylogenetic definitions are objective and stable. Node−based and branchbased definitions are most precise; however, apomorphybased definitions can be ambiguous due to difficulty in defining alternative character states, and optimisation uncertainty. A major benefit of ranks (information about relative nesting of taxa) can be achieved even more efficiently using standardised but rankless suffixes already widely used in phylogenetic taxonomy. Finally, in situations where the phylogeny is poorly known, phylogenetic nomenclature appears to be superior to the Linnean system. Phylogenetic nomenclature does not force one to officially name poorly corroborated groupings, whereas Linnean codes compel users to erect and name genera even when relevant supraspecific relationships are poorly known.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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