KEY NORTH AMERICAN MIGRATION SITES FOR
Red Knots & Semipalmated Sandpipers

Alto Golfo de California y Delta de Rio Colorado

Country: Mexico

Region: Baja California, Sonora

Nearest city/town: El Golfo de Santa Clara

Site: Alto Golfo de California y Delta de Rio Colorado

Species/Sub-species: REKN-roselaari

Total biogeographic population: 21,7701

Count Method: Maximum day count

Count: 6,06012

% biogeographic pop. at site: 27.84

Season (primarily): Spring

Site recognition: WHSRN Ramsar IBA

Site description: The site consists of mudflats, sandy beaches, and brackish marsh. The land is federally-owned (National Commission on Natural Protected Areas—CONANP). Alto Golfo de California y Delta del Río Colorado Biosphere Reserve has a Management Plan; however, shorebirds are not a specified priority. The site is listed as a Priority Wetland for Shorebirds by the Mexican National Shorebird Conservation Strategy; is an Important Bird Area; and contains three Wetlands of International Importance designations (numbers 0814, 1822, and 1866) by the Ramsar Convention on Wetlands.

Known threats: There is fishing and clamming at the site. In terms of land use change, a threat is the availability of sufficient volumes of water to maintain and/or increase the wetlands. A threat of pollution and contamination at the site is due to agrochemicals in the surrounding agricultural areas and solid waste generated by various human settlements. In terms of damaging recreational use, threats include high traffic tourism; a coastal highway that connects Puerto Peñasco with the Golfo Santa Clara; and to the south of Bahía Adair, the construction of a golf course that is destroying marshlands and canals. The spread of exotic species like salt cedar (pino salado) is also a threat.3,4

Sources: 1Carmona, R., N. Arce, V. Ayala-Perez, A. Hernández-Alvarez, J.B. Buchanan, L.J. Salzer, P.S. Tomkovich, J.A. Johnson, R.E. Gill, Jr., B.J. McCaffery, J.E. Lyons, L.J. Niles, D. Newstead. 2013. Red Knot Calidris canutus roselaari migration connectivity, abundance and non-breeding distribution along the Pacific coast of the Americas. Wader Study Group Bulletin. 2WHSRN Nomination Form 3Ramsar Fact Sheet: https://rsis.ramsar.org/RISapp/files/RISrep/MX814RIS.pdf 4Ramsar Fact Sheet: https://rsis.ramsar.org/RISapp/files/RISrep/MX1866RIS.pdf