Table 1 Geographic location and sample size (n) of the 59 sites sampled within the Tyrrhenian Islands

41°6.611′

9°13.731′

1

41°5.569′

9°14.757′

3

41°3.825′

9°24.300′

4

41°2.900′

9°19.756′

6

40°46.235′

9°32.380′

4

40°28.613′

9°7.766′

2

40°22.751′

9°26.065′

10

40°2.221′

9°15.438′

6

40°2.752′

9°31.012′

10

40°1.237′

9°31.922′

5

39°57.661′

9°32.632′

2

39°57.625′

9°33.680′

4

39°57.097′

9°36.282′

2

39°56.477′

9°34.785′

10

39°55.590′

9°38.244′

4

39°53.738′

9°11.561′

10

39°49.494′

9° 12.106′

10

39°30.284′

9°8.095′

8

39°23.525′

8°40.131′

6

39°30.210′

8°37.196′

2

39°33.355′

8°59.529′

7

40° 8.863′

8°32.295′

7

40°14.036′

8°35.382′

9

40°24.421′

8°37.614′

8

40°35.799′

8°38.053′

9

40°31.236′

8°52.058′

10

41°5.433′

9°14.119′

6

Corsica

42°48.760′

9°28.427′

12

42°35.515′

9° 21.799′

4

42°30.267′

9° 22.517′

9

42°26.069′

9°13.433′

4

42° 18.291′

9°8.779′

9

42° 16.504′

9°6.438′

5

42°11.860′

9°7.299′

3

42°6.869′

9°11.006′

2

42°6.153′

9°14.679′

8

42°0.990′

9°2.884′

5

41°49.292′

9°15.599′

7

41°46.110′

9°10.407′

10

41°41.447′

9°9.113′

10

41°37.541′

9°4.962′

7

41°39.831′

9° 0.889′

8

41°57.634′

9°0.340′

4

42°3.578′

8°57.781′

8

42°2.975′

8°47.106′

7

42°10.170′

8°49.200′

9

42°14.317′

8°50.838′

9

42°17.714′

8°42.141′

10

42°22.993′

8°41.940′

4

42°21.865′

8°48.113′

6

42°29.176′

8°48.176′

8

42°28.076′

9°6.385′

8

42°37.292′

8°59.813′

8

42°36.138′

9°8.313′

8

42°34.182′

9°18.256′

11

Elba

42°47.379′

10°7.370′

5

42°47.064′

10°9.962′

10

42°44.556′

10°10.353′

6

42°44.298′

10°10.604′

10