Bonjour,
Voici ce que l'on peut trouver sur le site Birds of the wolrd à la rubrique Plectrophane des neiges :
Birds of the wolrd :P. n. nivalis (Linnaeus, 1758); type locality = Lapland (n. FennoScandia). Includes Emberiza notata Müller, 1776; E. mustelina Gmelin, 1789; E. montana Gmelin, 1788; E. lotharingica Gmelin, 1788; E. glacialis Latham, 1790; P. n. subnivalis (Brehm, 1826); Plectrophanes hiemalis Brehm, 1831; and P. borealis Brehm, 1831. Breeds in arctic Alaska and Canada, Greenland, Faroe I., Jan Mayen I., Svalbard Archipelago (incl. Bjørnøya), and Franz Josef Land, and from Norway east through n. Sweden and Finland to the nw. border of Russia. Winters in s. Canada and n. United States, with records south to s. California, Texas, and Florida; and in n. Europe, with records south to the Mediterranean and n. Asia Minor. Dark areas of Alternate Plumage modestly saturated; white rump of breeding season plumage does not extend up lower back; mandibles black in summer. Relatively small compared to other subspecies (male wing chord = 102-115 mm, culmen < 11.5 mm).
Birds of the wolrd :P. n. insulae (Salomonsen, 1931); type locality = n. Iceland. Resident in Iceland, although records attributed to this subspecies for the Faroes, Shetlands, and n. Scotland represent either occasional winter movements into these areas or intergradation of breeding populations. Similar to P. n. nivalis but dark areas of Alternate Plumage more heavily saturated and browner, with white rump patch absent or very small, and more black in tail with only r1-r2 white. Averages slightly smaller body size than other subspecies.
Je ne saurais en dire plus.
Amicalement
Dominique.