Support and stability

Cladistics (Impact Factor: 6.22). 04/2009; 25(2):107-108. DOI: 10.1111/j.1096-0031.2008.00243.x
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    • "In my view, HovenkampÕs (2009) position is erroneous in at least two ways. First, as stated in my 2010 letter, resampled permutations of a given data set do not represent independent evidence, but are pseudoreplicates . "

    Full-text · Article · Oct 2011 · Cladistics
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    • "Sir, Hovenkamp (2009, p. 107) argued that stability of results equates to repeatability, and that as repeatability is ''a basic requirement for observations in empirical science'', ''a meaningful repetition of a cladistic study necessitates any of a number of possible changes in the basic data, and finds those elements of a cladogram to be repeatable that persist under a specified regime of changes''. In other words, a cladogram is not ''empirical science'' unless it has been subjected to a ''permutation support statistic''. 1 Both the premise and the conclusion of this argument are false. "

    Full-text · Article · Jul 2009 · Cladistics
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    ABSTRACT: Many of the controversies around the concept of homology rest on the subjectivity inherent to primary homology propositions. Dynamic homology partially solves this problem, but there has been up to now scant application of it outside of the molecular domain. This is probably because morphological and behavioural characters are rich in properties, connections and qualities, so that there is less space for conflicting character delimitations. Here we present a new method for the direct optimization of behavioural data, a method that relies on the richness of this database to delimit the characters, and on dynamic procedures to establish character state identity. We use between-species congruence in the data matrix and topological stability to choose the best cladogram. We test the methodology using sequences of predatory behaviour in a group of spiders that evolved the highly modified predatory technique of spitting glue onto prey. The cladogram recovered is fully compatible with previous analyses in the literature, and thus the method seems consistent. Besides the advantage of enhanced objectivity in character proposition, the new procedure allows the use of complex, context-dependent behavioural characters in an evolutionary framework, an important step towards the practical integration of the evolutionary and ecological perspectives on diversity. © The Willi Hennig Society 2010.
    No preview · Article · Dec 2010 · Cladistics
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