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Environment: California Least Tern

November 05, 1987

Orange County breeding populations and fledgling success of the endangered California Least Tern.

Estimated Number of Pairs

Colony 1978 1979 1980 1981 1982 Anaheim Bay 0 6 38-43 40-45 17-20 Huntington Beach 75-90 80-95 70-90 105-120 85-111 State Park Bolsa Chica (North) 0 15-20 20-26 31-54 70-92 Bolsa Chica (South) 0 19-23 NA 19-21 8-10 Upper Newport Bay 8-10 6-7 2-5 0 0 County Totals 83-100 126-151 130-164 195-240 180-233 State Totals 776-887 845-1049 890-1215 963-1171 1015-1245

Colony 1983 1984 1985 1986 Anaheim Bay 4 21-22 20 49 Huntington Beach 85-91 68-72 45 53 State Park Bolsa Chica (North) 110-116 82-83 96 60 Bolsa Chica (South) 25-30 18-22 22 10 Upper Newport Bay 9 6 0 13-18 County Totals 233-250 195-205 183 185 State Totals 1201-1326 931-1001 1019 NA

Estimated Minimum Number of Fledglings

Colony 1978 1979 1980 1981 1982 1983 Anaheim Bay 0 0 24 20 2 2 Huntington Beach 100 90 85 168 50 60 State Park Bolsa Chica (North) 0 3 15 20 70 35 Bolsa Chica (South) 0 3 0 0 5 10 Upper Newport Bay 0 0 0 0 0 2 County Totals 100 96 124 208 127 109 State Totals 418 650-742 745-793 826-830 469-553 874-919

Colony 1984 1985 1986 Anaheim Bay 33 3 70 Huntington Beach 20 42 10 State Park Bolsa Chica (North) 40 65 76 Bolsa Chica (South) 10 0 NA Upper Newport Bay 0 0 9 County Totals 103 110 165 State Totals 510-527 607-701 NA

NA: not available

Source: U.S. Fish and Wildlife Service

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