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Biofilm Consumption and Variable Diet Composition of Western Sandpipers (Calidris mauri) during Migratory Stopover

Fig 2

Mean isotope values of δ13C and δ15N (± standard deviation) for microphytobenthos, small invertebrates, large polychaetes, surface sediments (biofilm) and Western Sandpiper droppings.

Samples were collected at eight study sites within the Fraser Estuary—Boundary Bay migratory stopover location, 23 April–7 May 2012. 1:a Mud Bay, 1:b Boundary Bay East, 2:c Roberts Bank Inter-causeway, 2:d Roberts Bank Brunswick Point, 2:e Roberts Bank Westham Island, 3:f Sturgeon Bank South, 3:g Sturgeon Bank North, and 3:h Sturgeon Bank Iona.

Fig 2

doi: https://doi.org/10.1371/journal.pone.0124164.g002