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Theories of phylogeny Solutions to the phylogeny problemPhylogeny
applied to historical linguistics is the evolutionary descent of languages. The phylogeny problem is the question of what specific tree, in the tree model of language evolution, best explains the paths of descent of all the members of a language family from a Common, or Proto language at the root of the tree to the attested languages at the leaves of the tree. The Germanic languages form a tree with Proto-Germanic at its root. This tree is a branch of the Indo-European tree with Proto-Indo-European at its root. Due to borrowing of lexical items from contact languages, the position of the Germanic branch within Indo-European is more ambiguous than the positions of the other branches of Indo-European. Over the life of historical linguistics, various solutions have been proposed, none certain, and all debatable.To the evolutionary history of a language family, a genetic "tree model" is considered appropriate only if communities do not remain in effective contact as their languages diverge. Early IE was computed to have featured limited contact between distinct lineages, while only the Germanic subfamily exhibited a less treelike behaviour as it acquired some characteristics from neighbours early in its evolution rather than from its direct ancestors. The internal diversification of especially West Germanic is cited to have been radically non-treelike.[3]Proto-Germanic is generally agreed to have begun about 500 BC.[4] The hypothetical development between the end of Proto-Indo-European and 500 BC is termed Pre-Proto-Germanic. Whether it is to be included under a wider meaning of Proto-Germanic is a matter of usage.W. P. Lehmannconsidered that Jacob Grimm's "First Germanic Sound Shift", or Grimm's Law and Verner's Law,[5] which pertained mainly to consonants and were considered for a good many decades to have generated Proto-Germanic, were pre-Proto-Germanic, and that the "upper boundary" was the fixing of the accent, or stress, on the root syllable of a word, typically the first.[6] Proto-Indo-European had featured a moveable pitch accent comprising "an alternation of high and low tones"[7] as well as stress of position determined by a set of rules based on the lengths of the word's syllables.The fixation of the stress led to sound changes in unstressed syllables. For Lehmann, the "lower boundary" was the dropping of final -a or -e in unstressed syllables; for example, post-PIE * woyd-á > Gothic wait, "knows" (the > and < signs in linguistics indicate a genetic descent). Antonsen agreed with Lehmann about the upper boundary[8] but later found runic evidence that the -a was not dropped: ékwakraz … wraita, "I wakraz … wrote (this)." He says: "We must therefore search for a new lower boundary for Proto-Germanic."[9]His own scheme divides Proto-Germanic into an early and a late. The early includes the stress fixation and resulting "spontaneous vowel-shifts" while to define the late he lists ten complex rules governing changes of both vowels and consonants.[10]By 250 BC, Proto-Germanic had branched into five groups of Germanic (two each in the West and the North, and one in the East)
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