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1296 Genetica (2011) 139:1293–1308

a

b
c
d

a b
GAL MAR
FAV
CAR
ZEM
CAP
PAN

TIZ
BOF
MAD
PLF
APS NAQ c
APB CGR
ACS
CDN PIT
MLT
IPO MLA
LIT
ARG
DIQ
DES
CRL PAR
MVE
d
ALB
PLA
HAB

MEL
CHA

Fig. 1 Sampling locations of P. ferruginea. In the upper box, the area are reported. a Sardinia and Corsica; b Siculo-Tunisian Strait;
main geographic areas analysed in the western Mediterranean are c Strait of Gibraltar; d Alboran Sea. Abbreviations are given in
shown. In the following boxes (a, b, c, d) the collection sites at each Table 1

minimum number of clusters that captures the major rounds are performed on each subset of data. The proce-
structure in the data (Pritchard and Wen 2004); after this dure is reiterated until it is not possible to partition the data
first round data are partitioned into smaller datasets any further. To detect the uppermost hierarchical structure
according to the best clustering solution, and subsequent present in a given partition of data the method of Evanno

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