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Edited by Wyatt W. Anderson, University of Georgia, Athens, GA, and approved April 1, 2002 (received for review October 31, 2001)
Article Figures & SI
Figures
- Figure 1
The distribution of silvereye forms used in this study, with the timing and sequence of colonization events by Z. l. lateralis indicated by dates and arrows. (a) Geographic pattern of silvereye colonization. White and black circles show sampling locations for the recent colonizer, Z. l. lateralis, and evolutionarily old populations (Australian mainland; Norfolk Island; Lord Howe Island; and Heron Island), respectively. (b) Morphological divergence among silvereye forms. Abbreviations: ML, Australian mainland Z. l. familiaris; T, Tasmania; SI, South Island New Zealand; CI, Chatham Island; PN Palmerston North, south end of North Island New Zealand; NIlat, Norfolk Island (all Z. l. lateralis); HI, Heron Island Z. l. chlorocephalus; LHI, Lord Howe Island Z. tephropleurus; NIten, Norfolk Island Z. tenuirostris. Note that no morphological information is available for Auckland and that some SE bars are smaller than data points.
- Figure 2
Genetic diversity and divergence of silvereye forms as measured by (a) heterozygosity; (b) allelic diversity; (c) pairwise FST, and (d) Nei's DS. Error bars indicate standard errors calculated across loci. Arrows indicate recent colonization sequence. Abbreviations for populations are the same as in Fig. 1b, with the addition of A, Auckland, north end of North Island of New Zealand. Number of founder events is the number of island colonizations separating any two populations. Numbers in parentheses indicate the number of pairwise comparisons among populations or among subspecies/species. Age of divergence among subspecies and species were based on molecular and paleobiological evidence (26, 27).
Tables
- Table 1
Prior and posterior values for effective number of founding individuals (Nfd) of Z. l. lateralis on each island (Is.) based on 20,000 and 1,000 values, respectively
Population Quantiles Mean 5% 50% 95% Prior 152 17 152 286 Posterior South Is. 198 72 207 292 North Is. 143 34 132 278 Chatham 207 90 216 294 Norfolk 24 8 24 43 - Table 2
Comparison of the fit of the founder-event model vs. the gradual-drift model by using posterior weight probabilities of islands colonized by Z. l. lateralis
Opposing model Posterior probabilities SI PN CI NI Founder event 0.84 0.80 0.67 0.41 vs. vs. vs. vs. vs. Gradual drift 0.16 0.20 0.33 0.59 Significance test (pG) 0.12 0.20 0.23 0.23 -
Abbreviations: SI, South Island New Zealand; PN, Palmerston North, south end of North Island New Zealand; CI, Chatham Island; NI, Norfolk Island.
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Genetic consequences of sequential founder events by an island-colonizing bird
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