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VARIATION AND EVOLUTION OF PLANT SPECIES ON THE OUTLYING ISLANDS OF NEW ZEALAND, WITH PARTICULAR REFERENCE TO COTULA FEATHERSTONII
Author(s) -
Lloyd David G.
Publication year - 1982
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1220677
Subject(s) - allopatric speciation , archipelago , biological dispersal , divergence (linguistics) , biology , taxon , ecology , glacial period , evolutionary biology , paleontology , demography , population , linguistics , philosophy , sociology
Summary Among the plants occupying eight island groups outlying from New Zealand, there are three evolutionary patterns. (1) The commonest pattern involves long‐distance dispersal to one or more outlying archipelagos and the differentiation of a single derivative taxon. (2) Less commonly, dispersal to more than one island group has been followed by divergence between the distant archipelagos; various stages of allopatric speciation are represented. (3) In a few plant groups endemic to the Chatham Islands, there has been evolutionary divergence among islets within the archipelago. Cotula featherstonii provides an example. Plants from four islets were grown; they belong to three distinguishable races. The three races correspond to the three land masses present during the last glacial maximum (ca. 20,000 years B.P.).