Variation in White-rumped Sandpipers at Longridge Point on James Bay

by Jean Iron and Ron Pittaway

We saw thousands of White-rumped Sandpipers in various stages of molt from birds in worn alternate plumage to birds well molted into basic plumage. Note two birds at bottom left which are enlarged in next photo. Photo Mark Peck on 16 August 2010.


A few White-rumped Sandpipers were in worn alternate plumage (left) while most birds were more advanced into basic plumage. Note rufous in scapulars and arrowhead markings on sides and flanks. 16 August 1010. Photo by Mark Peck.


White-rumped Sandpiper with rufous in scapulars and no apparent pale area at base of lower mandible. Same bird in next photo. 12 August 2010.


Same White-rumped as in previous photo showing rufous in the scapulars. Note white rump patch. 12 August 2010.


White-rumped Sandpiper (front) shows how strongly rufous some individuals are. 13 August 2010.


More size and plumage variations in White-rumped Sandpipers. Plump bird on left and lean bird on right. 26 July 2010.


Table showing counts of White-rumped Sandpipers at Longridge Point 1-16 August 2010

1 Aug 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Aug
906 3555 5061 3912 5318 7576 6174 6080 6026 7541 4701 6645 6113 4844 5925 6650
West Bay, just west of Longridge Point, covered with thousands of Semipalmated Sandpipers and White-rumped Sandpipers on 26 July.