Migrant Semipalmated Sandpipers (Calidris pusilla) Have Over Four Decades Steadily Shifted Towards Safer Stopover Locations | Zendy

David D. Hope | Zendy; David B. Lank | Zendy; Paul A. Smith | Zendy; Julie Paquet | Zendy; Ronald C. Ydenberg | Zendy

Open Access

Migrant Semipalmated Sandpipers (Calidris pusilla) Have Over Four Decades Steadily Shifted Towards Safer Stopover Locations

Author(s) -

David D. Hope,

David B. Lank,

Paul A. Smith,

Julie Paquet,

Ronald C. Ydenberg

Publication year - 2020

Publication title -

frontiers in ecology and evolution

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.317

H-Index - 33

ISSN - 2296-701X

DOI - 10.3389/fevo.2020.00003

Subject(s) - calidris , sandpiper , geography , safer , predation , arctic , fishery , intertidal zone , ecology , environmental science , physical geography , biology , statistics , mathematics

A large majority of migrants are found at the safest sties in all years, however our analysis of the PMD demonstrated that the fraction increased over time. In 1974, 80% of birds were found at the safest 20% of the sites, while in 2017, this had increased to 97%. A sensitivity analysis shows that the shift was made specifically towards safer (and not just larger) sites. The shift as measured by a PMD index decline cannot be accounted for by possible biases inherent in the data set. We conclude that the data support the prediction that increasing predator danger has induced a shift by southbound migrant semipalmated sandpipers to safer sites.

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