Table 4 Analysis of isolation by distance in two Daphnia species

Distance	N (N_corr)	F versus log 10 distance	Rank F versus rank
		r	r
D. magna
(i) Among all pools^‡	138 (137)	0.09	0.02
(iii) Among pools within islands^‡	109 (87)	0.38^***	0.33^**
(iv) Among pools between islands^‡	138 (137)	−0.06	−0.04
(v) Among islands	25	0.21^***	0.22^***
D. longispina
(i) Among all pools	65	0.16^***	0.01
(ii) Among pools within a single island:
Island F	5	−0.10	0.02
Island FO	4	−0.27	−0.43
Island FS	5	0.89^**	0.82^**
Island G	14	0.23^*	0.25^*
Island IS2	4	0.33	0.03
Island M	4	−0.38	−0.37
Island N	12	0.41^***	0.28^*
Island SK	4	0.99^*	0.77
(iii) Among pools within islands^†	52	0.26^**	0.17^*
(iv) Among pools between islands^‡	65 (64)	−0.09	−0.15
(v) Among islands	15	−0.07	−0.12

Correlations between F and the logarithm (base 10) of geographic distance and between rank F and rank geographic distance are given (i) for pairwise differentiation among all pools, (ii) among pools on single islands (only D. longispina), (iii) among pools on the same island (pools within islands), (iv) among pools on different islands (pools between islands), (v) and among islands. Significance of r-values was evaluated by Mantel tests (), Fisher's method of combining probabilities (†), or by standard correlation analysis with corrected sample sizes (‡, see text). N equals number of islands (among islands) or number of pools (all other). N_corr equals the number of independent distance observations (only given, where used for test). F equals pairwise F_LT (among islands) or pairwise F_PT (all other). For island abbreviations, see Haag et al (2005).
^*P<0.05, ^**P<0.01, ^***P<0.001.

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