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in SGR. In both cases, the deviations from HWE are caused by a deficit of
heteozygotes, as evidenced by the positive F 1s values at these loci (Table 4).
Only 2 out of the 30 pairs of loci showed a significant LD after the sequential
Bonferroni correction (P < 0.05). Because pairwise comparisons atone or two loci are
expected to show genotypic disequi librium over 30 pairs by chance (specifically 1.5 out
of 30, corresponding to the cut-off of 5%), the loci were considered to be unlinked.
Moreover, two pairs of loci with a significant LD (Asaril6-Asari55 and Asaril6-
Asari62) were found only in SPOOL.
The mean number and the effective number of alleles were comparable for SPOOL (Na
= 12.833 ± 1.797; Ne = 4.074 ±0.892) and SGR (Na = 11.500 ± 1.607; Ne= 4.151
±0.814). In SPOOL, we found Ho= 0.621 ±0.077, and He = 0.662 ±0.091. Comparable
values were obtained in SGR (H0 = 0.626 ±0.090; He = 0.680 ±0.087). Indeed, the
expected heterozygosity of SPOOL was not significantly lower than SGR (P= l;
Wilcoxon rank-sum test). Table 5 reports the Wilcoxon rank-sum test results for
mutation-drift equilibrium under the SMM and TPM models.
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Gìan Luca Dedola: ANALISI DELLA VARIABILITÀ GENETICA DI PATELLA FéRRUGINEA, PATEL-LA ULl'SSIPONENSIS (MOLLUSCA: GASTROPODA) E PINNA
NOBILIS (MOLLUSCA: BIVALVIA): lLCONTRJBUTO DEl DATI MOLECOLARl ALLA CONSERVAZIONE DI SPECIE MINACCIATE- Tesi di douorato in Scienze
della natura e delle sue risorse • indiri7.zo BK>logi.a Ambientale, Università degli Studi di Sassarl
