Photo Credit: Mark Pavelka/USFWS. Resource Materials for the Least Tern Monitors is on the 2019 Nesting Season page. ABSTRACT.-The nesting season of the California Least Tern (Sterna albifrons browni) has often been characterized by two waves of nesting, but the composition of the later wave and reasons for its occurrence have not been well understood. There was a total of six nests at SAN, which is a historically low number. Nesting season for California least terns (Sternula antillarum browni) occurs from mid-April to August. ↑ Marschalek, D. (2009). Food is one of the major factors affecting This post is reprinted with permission from the Alameda Point Environmental Report blog. California least terns establish nesting colonies on sandy soils with little vegetation along the ocean, lagoons, and bays. California Least Tern Breeding Survey 2006 Season1 by Daniel A. Marschalek California Department of Fish and Game South Coast Region 4949 Viewridge Avenue San Diego, CA 92123 ABSTRACT Monitoring to document breeding success of California least terns (Sternula antillarum browni) continued in 2006, with observers at 31 nesting sites providing data. Female California least terns generally lay 1 to 3 eggs which take about 3 weeks to hatch. METHODS Monitors for each site that had least tern nesting in 2007 or who planned monitoring California Department of Fish and Game. The age of first breeding is typically 3 years; however, breeding by 2 year-old California least terns has been The volunteers, who help maintain the site, and the US Fish & Wildlife Service (USFWS) biologist responsible for the tern colony, have never left. At this time, not is much is known about California least tern ecology prior to their arrival on the nesting colonies. In any case, the bulk of the population has left California by the end of August. Fish abundance and the 1995 nesting season of the Least Tern at Bahía de San Jorge, Northern Gulf of California, México miles) from other major Least Tern nesting areas and, during ].980-1.989., the small colonies at Playa del Rey (0.8 miles ESE of Venice Beach), Upper Newport Bay (5.0 miles NE of Huntington Beach), and White Beach (3.5 miles N of Santa Margarita River) either failed early in the nesting season … The endangered Interior Least Tern (Sterna antillarum athalassos) breeds inland along the Missouri, Mississippi, Colorado, Arkansas, Red, and Rio Grande River systems. disturbance.Annual least tern productivity at D Street Fill is summarized in Appendix A. Notable events in the site's history included the site being abandoned by nesting terns in 1981 and 1990, butlo the cony being re-established with up to135 nests in 1992 (Copper 1981, Obst and Johnston 1992, Caffrey 1993). figure 1. The California Least Terns are arriving back at Alameda Point’s wildlife refuge to lay their eggs and raise their young. Preparing for Alameda’s Least Tern nesting season. Study of the California least tern nesting season was conducted in 1980. Least Terns did not initiate nesting until 45–56 days after Snowy Plovers; 43% of plover nests were initiated before Least Terns began nesting. These latest monitoring efforts were continued for the 2008 breeding season in California. 1997). The California least tern (Sterna antillarum brow-ni) is a migratory species, nesting along the West Coast of North America from Baja California north to the San Francisco Bay (U.S. Prior to the 1970s, Least Tern populations in California decreased because of loss of nesting habitat on beaches to human development and recreation (Massey 1974). The 9.7-acre nesting area for the endangered California least terns at Alameda Point received a new layer of sand this year. California Least Tern Breeding Survey 2009 Season (PDF) (Report). Unpublished Report, CDPR, Off-Highway Motor Vehicular Recreation Division. Fresh layer of sand on Alameda Point least tern nesting site. California least tern and federally threatened western snowy plover. Once the terns … The group helped clear and remove vegetation in a fenced off area on Fiesta island designated for the California Least Tern during their nesting. Frost, N. … Nesting California Least Tern (Sternula antillarum La Paz, Mexico. Over 60% of the nesting population can be found in San Diego County. California least terns often have two waves of nesting during this time period (Massey and Atwood 1981). California Least Terns nest on open, sandy dunes along the coast, and feed on small fish like anchovy and smelt in shallow coastal waters, lagoons and estuaries. Fish and Wildlife Service 1980). The nesting area at Huntington State Beach (Figure 1) has been a “top 5” colony in alifornia, in terms of number of pairs, nests, and fledgling production, making it … Their nests are shallow depressions lined with shells or other debris (Massey 1974, Cogswell 1977). The California Least Tern (Sterna antillarum browni), federally listed as endangered since 1970, breeds along the Pacific coast from central California to southern Baja California. California Department of Parks and Recreation, 2017. Keywords.—Least Tern, nesting season, foraging behavior, fish abundance, beach seine net, Gulf of California, Mexico, Sterna antillarum. Crows regularly prey on California Least Tern eggs and fledglings, because terns are most vulnerable at these stages. (Nelvin C. Cepeda / San Diego Union-Tribune) 2 / 8 California least tern breeding success and these data were compiled into annual summary reports.
2020 california least tern nesting season