Relative Effects of Habitat Amount and Fragmentation Per Se on Genetic Diversity of the Glanville Fritillary Butterfly.

Even though the effects were not significant, we found a positive trend of the habitat amount on H e and a negative trend on F IS (Table 3 ).

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From the patch level parameters and in line with previous ecological observations on the role of increased habitat patch area in the Glanville fritillary butterfly (Hanski 1999 ), we found that the size of the focal patch affected F ST and showed a clear trend with H e .

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When the size of the focal patch increased, patch genetic differentiation decreased and expected heterozygosity H e showed a trend to increase, indicating that more immigrants from the surrounding patches are colonising larger focal patches.

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