BirdForum is the net's largest birding community dedicated to wild birds and birding, and is absolutely FREE!

Register for an account to take part in lively discussions in the forum, post your pictures in the gallery and more.

Reply to thread

Message: <blockquote data-quote="l_raty" data-source="post: 2991194" data-attributes="member: 24811">Green-throated DiverLindsay (2002: Fig.1.9, Table 1.1) included 5 Gavia arctica: one from Scotland, two from Sweden, one from NW Russia (Ob river), one from NE Russia (Kolyma river). Based on distribution, the Kolyma bird should be viridigularis, the others arctica. In the mtDNA tree, the two Russian birds cluster together (weakly), and are embedded among the western sequences, suggesting no differentiation of viridigularis at the mtDNA level.Sprengelmeyer (2014: Table 1, Fig.7, 8, 9) included 7 Gavia arctica: six from Sweden (all from different sites and obtained in different years, ie., no reasons to think the birds might be particularly closely inter-related), and one (sample #1456) from Chukotka, Russia. Based on distribution, the Chukotka bird should be viridigularis, the others arctica. In the trees, the Chukotka bird appear sister to all the Swedish birds (very strong support for the monophyly of entire species; poor support in ML, but Bayesian PP=1 for the grouping of the Swedish birds). Could indicate some differentiation--but how much cannot be assessed from the presented results, and of course it could as well just be isolation by distance.</blockquote>