Sharp-tailed Sandpiper

Taxobox
name = Sharp-tailed Sandpiper
status = LC | status_system = IUCN3.1

---

regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Charadriiformes
familia = Scolopacidae
genus = "Calidris" (but see text)
species = "C. acuminata"
binomial = "Calidris acuminata"
binomial_authority = Horsfield, 1821

The Sharp-tailed Sandpiper, "Calidris acuminata" (but see below) is a small wader. It breeds in the boggy tundra of northeast Asia and is strongly migratory, wintering in south east Asia and Australasia. It occurs as a rare autumn migrant to North America, but in western Europe only as a very rare vagrant.

More recently, a review of new data has indicated that this bird should perhaps better be placed into the genus "Philomachus" - as "P. acuminatus" - which now contains only the ruff but if the Sharp-tailed Sandpiper is merged into it would need to accommodate the Broad-billed Sandpiper also (Thomas "et al.", 2004).

While the latter certainly is a most peculiar calidrid, the Sharp-tailed Sandpiper is much more similar to other "Calidris"/"Erolia" species such as the Pectoral Sandpiper. On the one hand, its larger size and long-legged stance, and the breast pattern which gradually fades away on the belly as in the Ruff instead of having a fairly sharp border as in the "Calidris"/"Erolia" stints indicate that placement in "Philomachus" may be correct. Still, it is just as possible that - given the fairly common instances of hybridization in calidrines - mitochondrial DNA data has given a false picture of this species' true affinities. The Curlew Sandpiper, which is a proposed parent of the hybrid called "Cooper's Sandpiper" ("Calidris" × "cooperi") together with the Sharp-tailed Sandpiper, is another unusual calidrid that is hard to place systematically.

Breeding adults are a rich brown with darker feather centres above, and white underneath apart from a buff breast. They have a light superciliary line above the eye and a chestnut crown. In winter, Sharp-tailed Sandpipers are grey above. The juveniles are brightly patterned above with rufous colouration and white mantle stripes.

Little is known of the breeding habits of this species, although it nests on the ground, and the male has a display flight.

This bird looks a lot like the Pectoral Sandpiper, within whose Asian range it breeds. It differs from that species in its breast pattern, stronger supercilium and more rufous crown. It has some similarities to the Long-toed Stint, but is much larger than that tiny stint.

These birds forage on grasslands and mudflats, like the Pectoral Sandpiper, picking up food by sight, sometimes by probing. They mainly eat insects and other invertebrates.

References

* Database entry includes justification for why this species is of least concern

* Hayman, Peter; Marchant, John & Prater, Tony (1986): "Shorebirds: an identification guide to the waders of the world". Houghton Mifflin, Boston. ISBN 0-395-60237-8

* Thomas, Gavin H.; Wills, Matthew A. & Székely, Tamás (2004): A supertree approach to shorebird phylogeny. "BMC Evol. Biol." 4: 28. doi|10.1186/1471-2148-4-28 [http://www.pubmedcentral.org/picrender.fcgi?artid=515296&blobtype=pdf PDF fulltext] [http://www.pubmedcentral.org/articlerender.fcgi?artid=515296#supplementary-material-sec Supplementary Material]

External links

* [http://www.oiseaux.net/birds/photos/sharp-tailed.sandpiper.html Oiseaux] Photos