The semipalmated sandpiper feeds and forages by running with its head down while snapping or probing through the sand in search of prey (Terres 1980). In coastal marine and estuarine habitats, C. pusilla feeds on a variety of benthic organisms, such as: the amphipods, Corophium volutator, Acanthohaustorius millsi and Protohaustorius deichmannae; polychaete worms; and small mollusks (Terres 1980; Schneider & Harrington 1981; McCurdy et al. 1999). Freshwater and terrestrial prey consists of fly larvae, beetles and other insects (Terres 1980).Predators: Documented predators of C. pusilla include larger birds such as the snowy owl, Nyctea scandiaca, and jaegers of the genus Stercorarius (Safriel 1975).Parasites: Like many other bird species, C. pusilla acts as a terminal or final host for several parasites acquired from a variety of prey items. One such example is the parasitic worm, Skrjabinoclava morrisoni, transmitted from the amphipod, Corophium volutator (McCurdy et al. 1999).
- Audubon. 2010. Semipalmated Sandpiper. National Audubon Society. Online at http://web1.audubon.org/science/species/watchlist/profile.php?speciesCode=semsan (Date accessed: 08/10/2010).
- Collazo, JA, O'Harra, DA & CA Kelly. 2002. Accessible habitat for shorebirds: factors influencing its availability and conservation implications. Waterbirds 25: 13-24.
- Farrand Jr., J (Ed.). 1983. The Audubon Society Master Guide to Birding Volume 1: Loons to Sandpipers. Alfred A. Knopf. New York. USA. 447 pp.
- Kale II, HW & DS Maehr. 1990. Florida's Birds. Pineapple Press. Sarasota, FL. USA. 288 pp.
- McCurdy, DG, Forbes, MR & JS Boates. 1999. Evidence that the parasitic nematode Skrjabinoclava manipulates host Corophium behavior to increase transmission to the sandpiper, Calidris pusilla. Behav. Ecol. 19: 351-357.
- Paulson, D. 2005. Shorebirds of North America: A Photographic Guide. Princeton Univ. Press. Princeton, NJ. USA. 361 pp.
- Peterson, RT. 1980. A Field Guide to the Birds: A Completely New Guide to All the Birds of Eastern and Central North America. Houghton Mifflin. Boston, MA. USA. 384 pp.
- Safriel, UN. 1975. On the significance of clutch size in nidifugous birds. Ecology 56: 703-708.
- Schneider, DC & BA Harrington. 1981. Timing of shorebird migration in relation to prey depletion. The Auk 98: 801-811.
- Terres, JK. 1980. The Audubon Society Encyclopedia of North American Birds. Alfred A. Knopf. New York. USA. 1109 pp.
- USFWS. 2010. Migratory Birds and Habitat Programs. U.S. Fish and Wildlife Service. Online at http://www.fws.gov/laws/lawsdigest/migtrea.html (Date accessed: 08/10/2010).
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