Variation in diet of Semipalmated Sandpipers (Calidris pusilla) during stopover in the upper Bay of Fundy, Canada

被引:36
作者
Quinn, J. T. [1 ]
Hamilton, D. J. [1 ]
机构
[1] Mt Allison Univ, Dept Biol, Sackville, NB E4L 1G7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
stable isotope analysis; Semipalmated Sandpiper; Calidris pusilla; diet flexibility; Bay of Fundy; Corophium volutator; biofilm; COROPHIUM-VOLUTATOR; FORAGING BEHAVIOR; WESTERN SANDPIPERS; CHIGNECTO BAY; RED KNOTS; SHOREBIRDS; MIGRATION; PREY; POPULATION; SELECTION;
D O I
10.1139/Z2012-086
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Semipalmated Sandpipers (Calidris pusilla (L., 1766)) use the upper Bay of Fundy, Canada, as a critical stopover site during their annual fall migration to wintering grounds in South America. While in the area, they feed extensively on mudflat invertebrates. Historically the amphipod Corophium volutator (Pallas, 1766) has been thought to make up the majority of their diet. However, we have recently observed flexibility in foraging behaviour and prey selection by sandpipers. The extent of this flexibility and the current diet composition is unknown. To address these knowledge gaps, we assessed Semipalmated Sandpiper diets using stable isotope analyses of blood plasma and available prey items. Data were collected in two arms of the Bay of Fundy during summer 2009 and 2010. Diets fluctuated between years and sites, but in all cases the diet was much more diverse than previously thought. Polychaetes and biofilm made substantial contributions, and C. volutator was still present in the diet, but at much reduced levels than previously noted. This previously unrecognized inclusion of biofilm in the diet is consistent with recent observations of other calidrid shorebirds. Based on measures of prey availability, there is little evidence of preference for C. volutator.
引用
收藏
页码:1181 / 1190
页数:10
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