Population information

Order name Charadriiformes
Family name Laridae
Scientific name Thalasseus sandvicensis Common name Sandwich Tern
Population name acuflavidus, E Brazil - Argentina (bre)
Breeding range E Brazil - Argentina Non-breeding range S Caribbean, Atlantic coast S America to Argentina
Red List Category Least Concern
Ramsar regions Neotropics
Notes Form eurygnathus (“Cayenne Tern”; often misspelt eurygnatha) previously considered a separate species, but S Caribbean data indicate it is a race or perhaps morph of T. sandvicensis, and that all New World populations (except those of extreme N) have at least small percentage of “Cayenne”-type birds; based on recent genetic study, eurygnathus here treated as a synonym of acuflavidus; the two interbreed freely in S Caribbean, and mixed pairs occur in Patagonia and Puerto Rico; in Curaçao typical acuflavidus make up 20% of population, while in French Guiana they comprise less than 1%. Two subspecies recognized.

Conservation Framework

Conservation framework Notes
No conservation frameworks
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 1 0 0 10,000 10,000 [R165]
WPE 2 0 0 -1 -1
WPE 3 0 0 10,000 10,000 [R165]
WPE 4 0 0 18,400 21,400 [S2526] [R227]
WPE 5 0 0 18,400 21,400 [S7343] [R227]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 1 0 0 Unknown
WPE 2 0 0 Unknown
WPE 3 0 0 Unknown
WPE 4 0 0 Unknown
WPE 5 0 0 Unknown No idea

Population 1% level

Publication Yearset 1 percent Note
WPE 1 1994 100
WPE 2 0 -1
WPE 3 2002 100
WPE 4 2006 200
WPE 5 2012 200

References

  • R165 - Croxall, J.P., Evans, P.G.H. and Schreiber, R.W. (eds.). 1984. Status and Conservation of the World's Seabirds. ICBP Technical Publication No. 2. Cambridge, UK.
  • R227 - Falk, K., Hjort, C., Andreasen, C.,Christensen, K.D., Elander, M., Ericson, M., Kampp, K., Kristensen, R.M., Mobjerg, N., Moller, S. and Weslawski, J.M. 1997. Seabirds utilising the Northeast Water polynya. Journal of Marine Systems 10: 47-65.

Notes

  • S2526 - 230: >2,800 pairs (8,400 individuals) in Argentinean Patagonia. E6: 10,000-13,000 individuals in Brazil.
  • S7343 - 230: >2,800 pairs (8,400 individuals) in Argentinean Patagonia. E6: 10,000-13,000 individuals in Brazil.



Copyright Wetlands International 2012

Citation: Wetlands International (). "Waterbird Population Estimates" . Retrieved from wpe.wetlands.org on