RESIDENCE IN THE ARCTIC 



303 



Table 13. — Duration of phases of migratory and reproductive cycles in 28 species 



of birds at Anaktuvuk 





Arrival date 



Duration 



of arrival 



period 



(days) 



First egg 

 date 



Days 

 from mid- 

 arrival 

 to mid- 

 laying 



Latest 



departure 



date 



Duration 

 of depar- 



Species 



First 

 migrant 



Last 

 migrant 



ture 

 period 

 (days) 



Plectrophenax nivalis nivalis 



Apr. 1 



June 1 



60 



"June 1 



34 



"Sept. 10 





Aqulla chrysaetoes canadensis 



Apr. 3 



Apr. 18 



15 











Lanius excubltor Invictus 



May 4 



May 16 



12 



May 27 



23 



Oct. 15 





Galea rius lapponicus alascensis 



May 6 



June 7 



32 



May 31 



14 



Sept. 2 



20 



Buteo lagopus 



May 8 



May 23 



15 











Eremophlla alpestris arctlcola 



May 10 



June 1 



20 



May 29 



13 



Aug. 24 



19 



Anthus spinoletta rubescens 



May 11 



June 6 



26 



June 1 



12 



Sept. 3 



30 



Anas acuta 



May 13 



June 6 



24 



May 23 



4 



'Sept. 10 



10 



Spizella arborea oehracea 



May 13 



May 30 



17 



June 3 



17 



Sept. 12 





Pluvialis dominica domlnica 



May 14 



May 31 



17 



May 28 



10 



Aug. 15 



16 



Turdus mlgratorlus migrato- 



May 15 



May 30 



15 



May 30 



12 



Sept. 18 



13 



nus. 

 Zonotrichia leucophrys gam- 



May 16 



May 29 



13 



June 3 



16 



Sept. 12 



12 



belil 

















Charadrlus semipalmatiis 



May 16 



June 6 



20 



June 12? 



21 



Aug. 16 



15 



Anas carolinensis 



May 18 



June 6 



14 



May 27 



6 



'Aug. 30 



10 



Totanus flavipes 



May 19 



May 27 



8 



June 1 



13 



Aug. 6 





Erolia balrdU 



May 19 



May 31 



12 



May 29 



8 



*Aug. 10 





Aythya marila nearctlca 



May 20 



May 26 



6 



June 5 



17 



*Sept. 10 





Olangula hyemalis 



May 20 



May 28 



8 



Jime 4 



15 



*Sept. 10 



10 



Lobipes lobatus 



May 22 



May 29 



7 



June 6 



16 



'Aug. 25 



10 



Ereunetes puslUus 



May 23 



Jime 1 



9 











Mergus serrator serrator 



May 23 



Jime 3 



11 



June 9 



17 



""Sept. 10 



11 



Oenanthe oenanthe oenanthe 



May 23 



May 27 



4 



June 6 



14 



"Sept. 1 



20 



Erolia mlnutilla 



May 24 



June 6 



12 



June 3 



8 







Stercorarius parasiticus 



May 24 



June 5 



12 



June 8 



13 



'Sept. 5 



10 



Melanitta deglandl 



May 25 



June 14 



21 



June 6 



9 



'Aug. 30 



10 



Calcarius pictus 



May 26 



June 3 



8 



June 4 



12 



Aug. 24 



10 



Sterna paradlsaea 



May 28 



June 6 



9 



May 31 



4 



'Aug. 30 



10 



Motacilla flava tschutschensis 



Jime 3 



June 5 



2 



June 10 



10 







Total (28) 









(av 



er.) (14) 







• Estimated from observations at Barrow. 

 » Estimated from growth of young. 



sufficient for a prolonged arrival from migration before tlieir nesting 

 begins in early June. At Anaktuvuk the equally early eagles (Aquila 

 chrysaetos canadensis) and somewhat later shrikes and rough-legged 

 hawks arrive in a wave lasting only a quarter as long. Such early and 

 plentiful birds as pintails, Alaska longspurs {Calcarius lap'ponicus 

 alascensis), horned larks, and pipits have also a rather prolonged 

 migration. Species which are numerous are not necessarily diverse 

 in behavior, but the populations of those species which are numerous 

 at Anaktuvuk are not so closely synchronized in migration as those 

 less numerous. 



Snow buntings winter in much of Alaska south of the Alaska range 

 from Unalaska and Nushagak to Sitka, along the lower Yukon and 

 north of the arctic circle at Kobuk, and also east of the Canadian 



