Table 2.
Results for the FS neutrality test for population expansion (Fu, 1997) and population expansion parameters τ̂ following Schneider & Excoffier (1999). Estimates are presented in italics when the algorithm did not converge (see Results and discussion section for details). The time of expansion expressed in million of years before present (mya) is calculated using mutation rates in the range 1.076 × 10−5 per generation per locus. The results for the islands (pooling samples from the same island) are presented in bold. Garabato is a monomorphic population and tests could not be performed. For comparison, time for the colonisation of Brachyderes rugatus are also presented from Emerson et al. (2000).
Population | N | Fu (1997) | Schneider & Excoffier (1999) | Emerson et al. (2000)B. rugatus (MYA) | ||||
---|---|---|---|---|---|---|---|---|
Fs | p(Fs) | τ̂ (95% CI) | t (mya) | SSD | p(SSD) | |||
Gran Canaria | 145 | −26.260 | *< 0.001 | 2.544 (1.372–5.010) | 1.970 | 0.002 | 0.569 | >2.56 |
1 Arguineguín | 30 | −21.890 | * < 0.001 | 3.703(2.138–5.636) | 2.868 | 0.003 | 0.469 | |
2 Galdar | 19 | −4.076 | * 0.017 | 2.722(1.128–3.892) | 2.108 | 0.004 | 0.554 | |
3 Mogán | 24 | −0.849 | 0.275 | 0.969(0.000–1.558) | 0.750 | 0.020 | 0.077 | |
4 Tamadaba | 24 (23) | −1.304 | 0.142 | 0.871 (0.000–1.489) | 0.675 | 0.014 | 0.138 | |
5 Tirajana | 24 | −5.052 | * 0.014 | 1.743 (0.413–5.224) | 1.350 | 0.008 | 0.399 | |
6 Tirma | 24 | −6.845 | * 0.001 | 2.438 (0.779–3.342) | 1.888 | 0.002 | 0.783 | |
Tenerife | 280 | −26.710 | *< 0.001 | 2.374 (1.330–3.144) | 1.839 | 0.000 | 0.910 | 1.89–2.56 |
7 Anaga | 24 | −0.192 | 0.185 | 3.000 (0.523–3.000) | 2.323 | 0.010 | 0.062 | |
8 Arico | 24 | −8.983 | * < 0.001 | 2.314(0.675–3.185) | 1.792 | 0.003 | 0.542 | |
9 Chinyero | 50 (49) | −15.290 | * < 0.001 | 2.294 (0.978–2.900) | 1.777 | 0.001 | 0.636 | |
10 La Esperanza | 24 | −3.040 | 0.022 | 2.722 (0.483–6.413) | 2.108 | 0.015 | 0.567 | |
11 La Guancha | 24 | −3.545 | 0.024 | 2.036 (0.501–2.875) | 1.577 | 0.003 | 0.623 | |
12 Güímar | 47 | −22.280 | * < 0.001 | 3.280(1.795–4.143) | 2.540 | 0.001 | 0.702 | |
13 Ifonche | 39 | −8.615 | * < 0.001 | 2.482(1.035–3.172) | 1.922 | 0.007 | 0.130 | |
14 Oratava | 24 | −6.456 | * 0.002 | 2.730 (0.993–6.926) | 2.114 | 0.010 | 0.285 | |
15 Vilaflor | 24 | −0.165 | 0.437 | 1.081 (0.000–1.766) | 0.837 | 0.009 | 0.192 | |
La Gomera | 36 | −0.424 | 0.427 | 1.558 (0.380–3.379) | 1.207 | 0.008 | 0.431 | |
16 Garabato | 12 | - | - | - | - | - | - | |
17 Imada | 24 | −0.879 | 0.294 | 1.307(0.182–2.064) | 1.012 | 0.002 | 0.711 | |
La Palma | 48 | −2.826 | 0.072 | 1.244 (0.311–1.726) | 0.963 | 0.004 | 0.285 | 1.58–2.00 |
18 Fuencaliente | 24 | −1.063 | 0.224 | 1.289(0.048–2.002) | 0.998 | 0.008 | 0.305 | |
19 Garafía | 24 | −1.279 | 0.184 | 1.206(0.053–1.904) | 0.934 | 0.002 | 0.720 | |
20 El Hierro | 24 (23) | −3.513 | *0.008 | 1.291 (0.040–2.035) | 1.000 | 0.008 | 0.301 | 1.00 |
Significant at α = 0.05 (p-value < 0.02)